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Merge branch 'docs/build-62-move-pg-ha-out-of-alpha' into 'master' 

Merge alpha_database into database

Closes gitlab-org/build/team-tasks#62

See merge request gitlab-org/gitlab-ee!3511
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doc/administration/high_availability/alpha_database.md
View file @ e806df81
# Configuring a Database for GitLab HA
There are multiple ways in which you can achieve Database High Availability
for use with GitLab:
* Use bundled services and configuration provided by the Omnibus GitLab package.
This option is available with [Enterprise Edition Premium](https://about.gitlab.com/gitlab-ee/) license.
* Use a cloud hosted solution
* Install and manage the database and other components yourself
> Important notes:
- Please read [database requirements document](https://docs.gitlab.com/ee/install/requirements.html#database) for more information on supported databases.
- This document will focus only on configuration supported with [GitLab Enterprise Edition Premium](https://about.gitlab.com/gitlab-ee/), using the Omnibus GitLab package.
- If you are a Community Edition or Enterprise Edition Starter user, consider using a cloud hosted solution.
- This document will not cover installations from source.
>
- If HA setup is not what you were looking for, see the [database configuration document](http://docs.gitlab.com/omnibus/settings/database.html)
for the Omnibus GitLab packages.
## Overview
>
Please read this document fully before attempting to configure PostgreSQL HA
for GitLab.
The recommended configuration for a PostgreSQL HA requires:
- A minimum of three database nodes
- Each node will run the following services:
- `PostgreSQL` - The database itself
- `repmgrd` - A service to monitor, and handle failover in case of a failure
- `Consul` agent - Used for service discovery, to alert other nodes when failover occurs
- A minimum of three `Consul` server nodes
- A minimum of one `pgbouncer` service node
You also need to take into consideration the underlying network topology,
making sure you have redundant connectivity between all Database and GitLab instances,
otherwise the networks will become a single point of failure.
## Required information
Before proceeding with configuration, you will need to collect all the necessary
information.
### Network information
PostgreSQL does not listen on any network interface by default. It needs to know
which IP address to listen on in order to be accessible to other services.
Similarly, PostgreSQL access is controlled based on the network source.
This is why you will need:
> IP address of each nodes network interface
- This can be set to `0.0.0.0` to listen on all interfaces. It cannot
be set to the loopack address `127.0.0.1`
> Network Address
- This can be in subnet (i.e. `192.168.0.0/255.255.255.0`) or CIDR (i.e.
`192.168.0.0/24`) form.
### User information
Various services require different configuration to secure
the communication as well as information required for running the service.
Bellow you will find details on each service and the minimum required
information you need to provide.
#### Consul information
When using default setup, minimum configuration requires:
- `CONSUL_USERNAME`. Defaults to `gitlab-consul`
- `CONSUL_DATABASE_PASSWORD`. Password for the database user.
- `CONSUL_PASSWORD_HASH`. This is a hash generated out of consul username/password pair.
Can be generated with:
```sh
echo -n 'CONSUL_DATABASE_PASSWORDCONSUL_USERNAME' | md5sum
```
- `CONSUL_SERVER_NODES`. The IP addresses or DNS records of the Consul server nodes.
Few notes on the service itself:
- The service runs under a system account, by default `gitlab-consul`.
- If you are using a different username, you will have to specify it. We
will refer to it with `CONSUL_USERNAME`,
- There will be a database user created with read only access to the repmgr
database
- Passwords will be stored in the following locations:
- `/etc/gitlab/gitlab.rb`: hashed
- `/var/opt/gitlab/pgbouncer/pg_auth`: hashed
- `/var/opt/gitlab/gitlab-consul/.pgpass`: plaintext
#### PostgreSQL information
When configuring PostgreSQL, we will set `max_wal_senders` to one more than
the number of database nodes in the cluster.
This is used to prevent replication from using up all of the
available database connections.
> Note:
- In this document we are assuming 3 database nodes, which makes this configuration:
```
postgresql['max_wal_senders'] = 4
```
As previously mentioned, you'll have to prepare the network subnets that will
be allowed to authenticate with the database.
You'll also need to supply the IP addresses or DNS records of Consul
server nodes.
We will need the following password information for the application's database user:
- `POSTGRESQL_USERNAME`. Defaults to `gitlab`
- `POSTGRESQL_USER_PASSWORD`. The password for the database user
- `POSTGRESQL_PASSWORD_HASH`. This is a hash generated out of the username/password pair.
Can be generated with:
```sh
echo -n 'POSTGRESQL_USER_PASSWORDPOSTGRESQL_USERNAME' | md5sum
```
#### Pgbouncer information
When using default setup, minimum configuration requires:
- `PGBOUNCER_USERNAME`. Defaults to `pgbouncer`
- `PGBOUNCER_PASSWORD`. This is a password for pgbouncer service.
- `PGBOUNCER_PASSWORD_HASH`. This is a hash generated out of pgbouncer username/password pair.
Can be generated with:
```sh
echo -n 'PGBOUNCER_PASSWORDPGBOUNCER_USERNAME' | md5sum
```
- `PGBOUNCER_NODE`, is the IP address or a FQDN of the node running Pgbouncer.
Few notes on the service itself:
- The service runs as the same system account as the database
- In the package, this is by default `gitlab-psql`
- If you use a non-default user account for Pgbouncer service (by default `pgbouncer`), you will have to specify this username. We will refer to this requirement with `PGBOUNCER_USERNAME`.
- The service will have a regular database user account generated for it
- This defaults to `repmgr`
- Passwords will be stored in the following locations:
- `/etc/gitlab/gitlab.rb`: hashed, and in plain text
- `/var/opt/gitlab/pgbouncer/pg_auth`: hashed
#### Repmgr information
When using default setup, you will only have to prepare the network subnets that will
be allowed to authenticate with the service.
Few notes on the service itself:
- The service runs under the same system account as the database
- In the package, this is by default `gitlab-psql`
- The service will have a superuser database user account generated for it
- This defaults to `gitlab_repmgr`
## Installing Omnibus GitLab
First, make sure to [download/install](https://about.gitlab.com/installation)
GitLab Omnibus **on each node**.
Make sure you install the necessary dependencies from step 1,
add GitLab package repository from step 2.
When installing the GitLab package, do not supply `EXTERNAL_URL` value.
## Initial node configuration
Each node needs to be configured to run only the services it needs.
### Configuring the Consul nodes
On each Consul node perform the following:
1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information) before executing the next step.
1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
```ruby
# Disable all components except Consul
bootstrap['enable'] = false
gitlab_rails['auto_migrate'] = false
gitaly['enable'] = false
gitlab_workhorse['enable'] = false
mailroom['enable'] = false
nginx['enable'] = false
postgresql['enable'] = false
redis['enable'] = false
sidekiq['enable'] = false
prometheus['enable'] = false
unicorn['enable'] = false
consul['enable'] = true
# START user configuration
# Replace placeholders:
#
# Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z
# with the addresses gathered for CONSUL_SERVER_NODES
consul['configuration'] = {
server: true,
retry_join: %w(Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z)
}
#
# END user configuration
```
1. [Reconfigure GitLab] for the changes to take effect.
After this is completed on each Consul server node, proceed further.
### Configuring the Database nodes
On each database node perform the following:
1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information), [`PGBOUNCER_PASSWORD_HASH`](#pgbouncer_information), [`POSTGRESQL_PASSWORD_HASH`](#postgresql_information), [`Number of db nodes`](#postgresql_information), and [`Network Address`](#network_address) before executing the next step.
1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
```ruby
# Disable all components except PostgreSQL and Repmgr and Consul
bootstrap['enable'] = false
gitaly['enable'] = false
mailroom['enable'] = false
nginx['enable'] = false
unicorn['enable'] = false
sidekiq['enable'] = false
redis['enable'] = false
gitlab_workhorse['enable'] = false
prometheus_monitoring['enable'] = false
repmgr['enable'] = true
postgresql['enable'] = true
consul['enable'] = true
# PostgreSQL configuration
postgresql['listen_address'] = '0.0.0.0'
postgresql['hot_standby'] = 'on'
postgresql['wal_level'] = 'replica'
postgresql['shared_preload_libraries'] = 'repmgr_funcs'
# Disable automatic database migrations
gitlab_rails['auto_migrate'] = false
# Configure the consul agent
consul['services'] = %w(postgresql)
# START user configuration
# Please set the real values as explained in Required Information section
#
# Replace PGBOUNCER_PASSWORD_HASH with a generated md5 value
postgresql['pgbouncer_user_password'] = 'PGBOUNCER_PASSWORD_HASH'
# Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
postgresql['sql_user_password'] = 'POSTGRESQL_PASSWORD_HASH'
# Replace X with value of number of db nodes + 1
postgresql['max_wal_senders'] = X
# Replace XXX.XXX.XXX.XXX/YY with Network Address
postgresql['trust_auth_cidr_addresses'] = %w(XXX.XXX.XXX.XXX/YY)
repmgr['trust_auth_cidr_addresses'] = %w(XXX.XXX.XXX.XXX/YY)
# Replace placeholders:
#
# Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z
# with the addresses gathered for CONSUL_SERVER_NODES
consul['configuration'] = {
retry_join: %w(Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z)
}
#
# END user configuration
```
1. [Reconfigure GitLab] for the changes to take effect.
> Please note:
- If you want your database to listen on a specific interface, change the config:
`postgresql['listen_address'] = '0.0.0.0'`
- If your Pgbouncer service runs under a different user account,
you also need to specify: `postgresql['pgbouncer_user'] = PGBOUNCER_USERNAME` in
your configuration
`
### Configuring the Pgbouncer node
1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information), [`CONSUL_PASSWORD_HASH`](#consul_information), and [`PGBOUNCER_PASSWORD_HASH`](#pgbouncer_information) before executing the next step.
1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
```ruby
# Disable all components except Pgbouncer and Consul agent
bootstrap['enable'] = false
gitaly['enable'] = false
mailroom['enable'] = false
nginx['enable'] = false
redis['enable'] = false
prometheus['enable'] = false
postgresql['enable'] = false
unicorn['enable'] = false
sidekiq['enable'] = false
gitlab_workhorse['enable'] = false
gitlab_rails['auto_migrate'] = false
pgbouncer['enable'] = true
consul['enable'] = true
# Configure Pgbouncer
pgbouncer['admin_users'] = %w(pgbouncer gitlab-consul)
# Configure Consul agent
consul['watchers'] = %w(postgresql)
# START user configuration
# Please set the real values as explained in Required Information section
# Replace CONSUL_PASSWORD_HASH with with a generated md5 value
# Replace PGBOUNCER_PASSWORD_HASH with with a generated md5 value
pgbouncer['users'] = {
'gitlab-consul': {
password: 'CONSUL_PASSWORD_HASH'
},
'pgbouncer': {
password: 'PGBOUNCER_PASSWORD_HASH'
}
}
# Replace placeholders:
#
# Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z
# with the addresses gathered for CONSUL_SERVER_NODES
consul['configuration'] = {
retry_join: %w(Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z)
}
#
# END user configuration
```
1. [Reconfigure GitLab] for the changes to take effect.
### Configuring the Application nodes
These will be the nodes running the `gitlab-rails` service. You may have other
attributes set, but the following need to be set.
1. Edit `/etc/gitlab/gitlab.rb`:
```ruby
# Disable PostgreSQL on the application node
postgresql['enable'] = false
gitlab_rails['db_host'] = 'PGBOUNCER_NODE'
gitlab_rails['db_port'] = 6432
gitlab_rails['db_password'] = 'POSTGRESQL_USER_PASSWORD'
gitlab_rails['auto_migrate'] = false
```
1. [Reconfigure GitLab] for the changes to take effect.
## Node post-configuration
After reconfigure successfully runs, the following steps must be completed to
get the cluster up and running.
### Consul nodes post-configuration
Verify the nodes are all communicating:
```sh
/opt/gitlab/embedded/bin/consul members
```
The output should be similar to:
```
Node Address Status Type Build Protocol DC
CONSUL_NODE_ONE XXX.XXX.XXX.YYY:8301 alive server 0.9.2 2 gitlab_consul
CONSUL_NODE_TWO XXX.XXX.XXX.YYY:8301 alive server 0.9.2 2 gitlab_consul
CONSUL_NODE_THREE XXX.XXX.XXX.YYY:8301 alive server 0.9.2 2 gitlab_consul
DATABASE_NODE_ONE XXX.XXX.XXX.YYY:8301 alive client 0.9.2 2 gitlab_consul
DATABASE_NODE_TWO XXX.XXX.XXX.YYY:8301 alive client 0.9.2 2 gitlab_consul
DATABASE_NODE_THREE XXX.XXX.XXX.YYY:8301 alive client 0.9.2 2 gitlab_consul
PGBOUNCER_NODE XXX.XXX.XXX.YYY:8301 alive client 0.9.0 2 gitlab_consul
```
### Database nodes post-configuration
#### Primary node
Select one node as a primary node.
1. Open a database prompt:
```sh
gitlab-psql -d gitlabhq_production
```
1. Enable the `pg_trgm` extension:
```sh
CREATE EXTENSION pg_trgm;
```
1. Exit the database prompt by typing `\q` and Enter.
1. Verify the cluster is initialized with one node:
```sh
gitlab-ctl repmgr cluster show
```
The output should be similar to the following:
```
Role | Name | Upstream | Connection String
----------+----------|----------|----------------------------------------
* master | HOSTNAME | | host=HOSTNAME user=gitlab_repmgr dbname=gitlab_repmgr
```
1. Note down the value in the `Name` column. We will refer to it in the next section
as `MASTER_NODE_NAME`.
#### Secondary nodes
1. Setup the repmgr standby:
```sh
gitlab-ctl repmgr standby setup MASTER_NODE_NAME
```
Do note that this will remove the existing data on the node. The command
has a wait time.
The output should be similar to the following:
```console
# gitlab-ctl repmgr standby setup MASTER_NODE_NAME
Doing this will delete the entire contents of /var/opt/gitlab/postgresql/data
If this is not what you want, hit Ctrl-C now to exit
To skip waiting, rerun with the -w option
Sleeping for 30 seconds
Stopping the database
Removing the data
Cloning the data
Starting the database
Registering the node with the cluster
ok: run: repmgrd: (pid 19068) 0s
```
1. Verify the node now appears in the cluster:
```sh
gitlab-ctl repmgr cluster show
```
The output should be similar to the following:
```
Role | Name | Upstream | Connection String
----------+---------|-----------|------------------------------------------------
* master | MASTER | | host=MASTER_NODE_NAME user=gitlab_repmgr dbname=gitlab_repmgr
standby | STANDBY | MASTER | host=STANDBY_HOSTNAME user=gitlab_repmgr dbname=gitlab_repmgr
```
Repeat the above steps on all secondary nodes.
### Pgbouncer node post-configuration
1. Create a `.pgpass` file user for the `CONSUL_USER` account to be able to
reload pgbouncer. Confirm `PGBOUNCER_PASSWORD` twice when asked:
```sh
gitlab-ctl write-pgpass --host 127.0.0.1 --database pgbouncer --user pgbouncer --hostuser gitlab-consul
```
1. Ensure the node is talking to the current master:
```sh
gitlab-ctl pgb-console # You will be prompted for PGBOUNCER_PASSWORD
```
Then run:
```sh
show databases ; show clients ;
```
The output should be similar to the following:
```
name | host | port | database | force_user | pool_size | reserve_pool | pool_mode | max_connections | current_connections
---------------------+-------------+------+---------------------+------------+-----------+--------------+-----------+-----------------+---------------------
gitlabhq_production | MASTER_HOST | 5432 | gitlabhq_production | | 20 | 0 | | 0 | 0
pgbouncer | | 6432 | pgbouncer | pgbouncer | 2 | 0 | statement | 0 | 0
(2 rows)
type | user | database | state | addr | port | local_addr | local_port | connect_time | request_time | ptr | link | remote_pid | tls
------+-----------+---------------------+---------+----------------+-------+------------+------------+---------------------+---------------------+-----------+------+------------+-----
C | (nouser) | gitlabhq_production | waiting | IP_OF_APP_NODE | 56512 | 127.0.0.1 | 6432 | 2017-08-21 18:08:51 | 2017-08-21 18:08:51 | 0x22b3700 | | 0 |
C | pgbouncer | pgbouncer | active | 127.0.0.1 | 56846 | 127.0.0.1 | 6432 | 2017-08-21 18:09:59 | 2017-08-21 18:10:48 | 0x22b3880 | | 0 |
(2 rows)
```
### Application node post-configuration
Ensure that all migrations ran:
```sh
gitlab-rake gitlab:db:configure
```
## Ensure GitLab is running
At this point, your GitLab instance should be up and running. Verify you are
able to login, and create issues and merge requests.
## Failover procedure
By default, if the master database fails, `repmgrd` should promote one of the
standby nodes to master automatically, and consul will update pgbouncer with
the new master.
If you need to failover manually, you have two options:
**Shutdown the current master database**
Run:
```sh
gitlab-ctl stop postgresql
```
The automated failover process will see this and failover to one of the
standby nodes.
**Or perform a manual failover**
1. Ensure the old master node is not still active.
1. Login to the server that should become the new master and run:
```sh
gitlab-ctl repmgr standby promote
```
1. If there are any other standby servers in the cluster, have them follow
the new master server:
```sh
gitlab-ctl repmgr standby follow NEW_MASTER
```
## Restore procedure
If a node fails, it can be removed from the cluster, or added back as a standby
after it has been restored to service.
- If you want to remove the node from the cluster, on any other node in the
cluster, run:
```sh
gitlab-ctl repmgr standby unregister --node=X
```
where X is the value of node in `repmgr.conf` on the old server.
To find this, you can use:
```sh
awk -F = '$1 == "node" { print $2 }' /var/opt/gitlab/postgresql/repmgr.conf
```
It will output something like:
```
959789412
```
Then you will use this id to unregister the node:
```sh
gitlab-ctl repmgr standby unregister --node=959789412
```
- To add the node as a standby server:
```sh
gitlab-ctl repmgr standby follow NEW_MASTER
gitlab-ctl restart repmgrd
```
CAUTION: **Warning:** When the server is brought back online, and before
you switch it to a standby node, repmgr will report that there are two masters.
If there are any clients that are still attempting to write to the old master,
this will cause a split, and the old master will need to be resynced from
scratch by performing a `standby setup NEW_MASTER`.
## Alternate configurations
### Database authorization
By default, we give any host on the database network the permission to perform
repmgr operations using PostgreSQL's `trust` method. If you do not want this
level of trust, there are alternatives.
You can trust only the specific nodes that will be database clusters, or you
can require md5 authentication.
#### Trust specific addresses
If you know the IP address, or FQDN of all database and pgbouncer nodes in the
cluster, you can trust only those nodes.
In `/etc/gitlab/gitlab.rb` on all of the database nodes, set
`repmgr['trust_auth_cidr_addresses']` to an array of strings containing all of
the addresses.
If setting to a node's FQDN, they must have a corresponding PTR record in DNS.
If setting to a node's IP address, specify it as `XXX.XXX.XXX.XXX/32`.
For example:
```ruby
repmgr['trust_auth_cidr_addresses'] = %w(192.168.1.44/32 db2.example.com)
```
#### MD5 Authentication
If you are running on an untrusted network, repmgr can use md5 authentication
with a [.pgpass file](https://www.postgresql.org/docs/9.6/static/libpq-pgpass.html)
to authenticate.
You can specify by IP address, FQDN, or by subnet, using the same format as in
the previous section:
1. On the current master node, create a password for the `gitlab` and
`gitlab_repmgr` user:
```sh
gitlab-psql -d template1
template1=# \password gitlab_repmgr
Enter password: ****
Confirm password: ****
template1=# \password gitlab
```
1. On each database node:
1. Edit `/etc/gitlab/gitlab.rb`:
1. Ensure `repmgr['trust_auth_cidr_addresses']` is **not** set
1. Set `postgresql['md5_auth_cidr_addresses']` to the desired value
1. Set `postgresql['sql_replication_user'] = 'gitlab_repmgr'`
1. Reconfigure with `gitlab-ctl reconfigure`
1. Restart postgresql with `gitlab-ctl restart postgresql`
1. Create a `.pgpass` file. Enter the `gitlab_repmgr` password twice to
when asked:
```sh
gitlab-ctl write-pgpass --user gitlab_repmgr --hostuser gitlab-psql --database '*'
```
1. On each pgbouncer node, edit `/etc/gitlab/gitlab.rb`:
1. Ensure `gitlab_rails['db_password']` is set to the plaintext password for
the `gitlab` database user
1. [Reconfigure GitLab] for the changes to take effect
## Architecture
![PG HA Architecture](pg_ha_architecture.png)
Database nodes run two services besides PostgreSQL
1. Repmgrd -- monitors the cluster and handles failover in case of an issue with the master
The failover consists of
* Selecting a new master for the cluster
* Promoting the new node to master
* Instructing remaining servers to follow the new master node
On failure, the old master node is automatically evicted from the cluster, and should be rejoined manually once recovered.
1. Consul -- Monitors the status of each node in the database cluster, and tracks its health in a service definiton on the consul cluster.
Alongside pgbouncer, there is a consul agent that watches the status of the PostgreSQL service. If that status changes, consul runs a script which updates the configuration and reloads pgbouncer
## Troubleshooting
### Consul and PostgreSQL changes not taking effect.
Due to the potential impacts, `gitlab-ctl reconfigure` only reloads Consul and PostgreSQL, it will not restart the services. However, not all changes can be activated by reloading.
To restart either service, run `gitlab-ctl restart SERVICE`
For PostgreSQL, it is usually safe to restart the master node by default. Automatic failover defaults to a 1 minute timeout. Provided the database returns before then, nothing else needs to be done. To be safe, you can stop `repmgrd` on the standby nodes first with `gitlab-ctl stop repmgrd`, then start afterwards with `gitlab-ctl start repmgrd`.
On the consul server nodes, it is important to restart the consul service in a controlled fashion. Read our [consul documentation](consul.md#restarting-the-server-cluster) for instructions on how to restart the service.
### Issues with other components
If you're running into an issue with a component not outlined here, be sure to check the troubleshooting section of their specific documentation page.
- [Consul](consul.md#troubleshooting)
- [PostgreSQL](http://docs.gitlab.com/omnibus/settings/database.html#troubleshooting)
- [GitLab application](gitlab.md#troubleshooting)
---
Read more on high-availability configuration:
1. [Configure Redis](redis.md)
1. [Configure NFS](nfs.md)
1. [Configure the GitLab application servers](gitlab.md)
1. [Configure the load balancers](load_balancer.md)
1. [Manage the bundled Consul cluster](consul.md)
[reconfigure GitLab]: ../restart_gitlab.md#omnibus-gitlab-reconfigure
This documentation has been moved to the main [database documentation](database.md#configure_using_omnibus_for_high_availability).
doc/administration/high_availability/database.md
View file @ e806df81
......@@ -5,6 +5,15 @@ yourself, or you can use GitLab Omnibus packages to help. GitLab recommends
PostgreSQL. This is the database that will be installed if you use the
Omnibus package to manage your database.
> Important notes:
- This document will focus only on configuration supported with [GitLab Enterprise Edition Premium](https://about.gitlab.com/gitlab-ee/), using the Omnibus GitLab package.
- If you are a Community Edition or Enterprise Edition Starter user, consider using a cloud hosted solution.
- This document will not cover installations from source.
>
- If HA setup is not what you were looking for, see the [database configuration document](http://docs.gitlab.com/omnibus/settings/database.html)
for the Omnibus GitLab packages.
## Configure your own database server
If you're hosting GitLab on a cloud provider, you can optionally use a
......@@ -20,103 +29,691 @@ If you use a cloud-managed service, or provide your own PostgreSQL:
1. Configure the GitLab application servers with the appropriate details.
This step is covered in [Configuring GitLab for HA](gitlab.md).
## Configure using Omnibus
## Configure using Omnibus for High Availability
>
Please read this document fully before attempting to configure PostgreSQL HA
for GitLab.
>
This configuration is GA in EE 10.2.
The recommended configuration for a PostgreSQL HA requires:
- A minimum of three database nodes
- Each node will run the following services:
- `PostgreSQL` - The database itself
- `repmgrd` - A service to monitor, and handle failover in case of a failure
- `Consul` agent - Used for service discovery, to alert other nodes when failover occurs
- A minimum of three `Consul` server nodes
- A minimum of one `pgbouncer` service node
You also need to take into consideration the underlying network topology,
making sure you have redundant connectivity between all Database and GitLab instances,
otherwise the networks will become a single point of failure.
### Architecture
![PG HA Architecture](pg_ha_architecture.png)
Database nodes run two services besides PostgreSQL
1. Repmgrd -- monitors the cluster and handles failover in case of an issue with the master
The failover consists of
* Selecting a new master for the cluster
* Promoting the new node to master
* Instructing remaining servers to follow the new master node
On failure, the old master node is automatically evicted from the cluster, and should be rejoined manually once recovered.
**Note**: We're working on a new version that will help automate the setup of a PostgreSQL cluster.
You can use the [alpha version of the document](alpha_database.md) to try it out now.
1. Consul -- Monitors the status of each node in the database cluster, and tracks its health in a service definiton on the consul cluster.
1. Download/install GitLab Omnibus using **steps 1 and 2** from
[GitLab downloads](https://about.gitlab.com/downloads). Do not complete other
steps on the download page.
1. Create/edit `/etc/gitlab/gitlab.rb` and use the following configuration.
Be sure to change the `external_url` to match your eventual GitLab front-end
URL. If there is a directive listed below that you do not see in the configuration, be sure to add it.
Alongside pgbouncer, there is a consul agent that watches the status of the PostgreSQL service. If that status changes, consul runs a script which updates the configuration and reloads pgbouncer
### Required information
Before proceeding with configuration, you will need to collect all the necessary
information.
#### Network information
PostgreSQL does not listen on any network interface by default. It needs to know
which IP address to listen on in order to be accessible to other services.
Similarly, PostgreSQL access is controlled based on the network source.
This is why you will need:
> IP address of each nodes network interface
- This can be set to `0.0.0.0` to listen on all interfaces. It cannot
be set to the loopack address `127.0.0.1`
> Network Address
- This can be in subnet (i.e. `192.168.0.0/255.255.255.0`) or CIDR (i.e.
`192.168.0.0/24`) form.
#### User information
Various services require different configuration to secure
the communication as well as information required for running the service.
Bellow you will find details on each service and the minimum required
information you need to provide.
##### Consul information
When using default setup, minimum configuration requires:
- `CONSUL_USERNAME`. Defaults to `gitlab-consul`
- `CONSUL_DATABASE_PASSWORD`. Password for the database user.
- `CONSUL_PASSWORD_HASH`. This is a hash generated out of consul username/password pair.
Can be generated with:
```sh
echo -n 'CONSUL_DATABASE_PASSWORDCONSUL_USERNAME' | md5sum
```
- `CONSUL_SERVER_NODES`. The IP addresses or DNS records of the Consul server nodes.
Few notes on the service itself:
- The service runs under a system account, by default `gitlab-consul`.
- If you are using a different username, you will have to specify it. We
will refer to it with `CONSUL_USERNAME`,
- There will be a database user created with read only access to the repmgr
database
- Passwords will be stored in the following locations:
- `/etc/gitlab/gitlab.rb`: hashed
- `/var/opt/gitlab/pgbouncer/pg_auth`: hashed
- `/var/opt/gitlab/gitlab-consul/.pgpass`: plaintext
##### PostgreSQL information
When configuring PostgreSQL, we will set `max_wal_senders` to one more than
the number of database nodes in the cluster.
This is used to prevent replication from using up all of the
available database connections.
> Note:
- In this document we are assuming 3 database nodes, which makes this configuration:
```
postgresql['max_wal_senders'] = 4
```
As previously mentioned, you'll have to prepare the network subnets that will
be allowed to authenticate with the database.
You'll also need to supply the IP addresses or DNS records of Consul
server nodes.
We will need the following password information for the application's database user:
- `POSTGRESQL_USERNAME`. Defaults to `gitlab`
- `POSTGRESQL_USER_PASSWORD`. The password for the database user
- `POSTGRESQL_PASSWORD_HASH`. This is a hash generated out of the username/password pair.
Can be generated with:
```sh
echo -n 'POSTGRESQL_USER_PASSWORDPOSTGRESQL_USERNAME' | md5sum
```
##### Pgbouncer information
When using default setup, minimum configuration requires:
- `PGBOUNCER_USERNAME`. Defaults to `pgbouncer`
- `PGBOUNCER_PASSWORD`. This is a password for pgbouncer service.
- `PGBOUNCER_PASSWORD_HASH`. This is a hash generated out of pgbouncer username/password pair.
Can be generated with:
```sh
echo -n 'PGBOUNCER_PASSWORDPGBOUNCER_USERNAME' | md5sum
```
- `PGBOUNCER_NODE`, is the IP address or a FQDN of the node running Pgbouncer.
Few notes on the service itself:
- The service runs as the same system account as the database
- In the package, this is by default `gitlab-psql`
- If you use a non-default user account for Pgbouncer service (by default `pgbouncer`), you will have to specify this username. We will refer to this requirement with `PGBOUNCER_USERNAME`.
- The service will have a regular database user account generated for it
- This defaults to `repmgr`
- Passwords will be stored in the following locations:
- `/etc/gitlab/gitlab.rb`: hashed, and in plain text
- `/var/opt/gitlab/pgbouncer/pg_auth`: hashed
##### Repmgr information
When using default setup, you will only have to prepare the network subnets that will
be allowed to authenticate with the service.
Few notes on the service itself:
- The service runs under the same system account as the database
- In the package, this is by default `gitlab-psql`
- The service will have a superuser database user account generated for it
- This defaults to `gitlab_repmgr`
### Installing Omnibus GitLab
First, make sure to [download/install](https://about.gitlab.com/installation)
GitLab Omnibus **on each node**.
Make sure you install the necessary dependencies from step 1,
add GitLab package repository from step 2.
When installing the GitLab package, do not supply `EXTERNAL_URL` value.
### Initial node configuration
Each node needs to be configured to run only the services it needs.
#### Configuring the Consul nodes
On each Consul node perform the following:
1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information) before executing the next step.
1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
```ruby
external_url 'https://gitlab.example.com'
# Disable all components except Consul
bootstrap['enable'] = false
gitlab_rails['auto_migrate'] = false
gitaly['enable'] = false
gitlab_workhorse['enable'] = false
mailroom['enable'] = false
nginx['enable'] = false
postgresql['enable'] = false
redis['enable'] = false
sidekiq['enable'] = false
prometheus['enable'] = false
unicorn['enable'] = false
# Disable all components except PostgreSQL
postgresql['enable'] = true
consul['enable'] = true
# START user configuration
# Replace placeholders:
#
# Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z
# with the addresses gathered for CONSUL_SERVER_NODES
consul['configuration'] = {
server: true,
retry_join: %w(Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z)
}
#
# END user configuration
```
1. [Reconfigure GitLab] for the changes to take effect.
After this is completed on each Consul server node, proceed further.
#### Configuring the Database nodes
On each database node perform the following:
1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information), [`PGBOUNCER_PASSWORD_HASH`](#pgbouncer_information), [`POSTGRESQL_PASSWORD_HASH`](#postgresql_information), [`Number of db nodes`](#postgresql_information), and [`Network Address`](#network_address) before executing the next step.
1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
```ruby
# Disable all components except PostgreSQL and Repmgr and Consul
bootstrap['enable'] = false
gitaly['enable'] = false
mailroom['enable'] = false
nginx['enable'] = false
unicorn['enable'] = false
sidekiq['enable'] = false
redis['enable'] = false
prometheus['enable'] = false
gitaly['enable'] = false
gitlab_workhorse['enable'] = false
mailroom['enable'] = false
prometheus_monitoring['enable'] = false
repmgr['enable'] = true
postgresql['enable'] = true
consul['enable'] = true
# PostgreSQL configuration
gitlab_rails['db_password'] = 'DB password'
postgresql['md5_auth_cidr_addresses'] = ['0.0.0.0/0']
postgresql['listen_address'] = '0.0.0.0'
postgresql['hot_standby'] = 'on'
postgresql['wal_level'] = 'replica'
postgresql['shared_preload_libraries'] = 'repmgr_funcs'
# Disable automatic database migrations
gitlab_rails['auto_migrate'] = false
# Configure the consul agent
consul['services'] = %w(postgresql)
# START user configuration
# Please set the real values as explained in Required Information section
#
# Replace PGBOUNCER_PASSWORD_HASH with a generated md5 value
postgresql['pgbouncer_user_password'] = 'PGBOUNCER_PASSWORD_HASH'
# Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
postgresql['sql_user_password'] = 'POSTGRESQL_PASSWORD_HASH'
# Replace X with value of number of db nodes + 1
postgresql['max_wal_senders'] = X
# Replace XXX.XXX.XXX.XXX/YY with Network Address
postgresql['trust_auth_cidr_addresses'] = %w(XXX.XXX.XXX.XXX/YY)
repmgr['trust_auth_cidr_addresses'] = %w(XXX.XXX.XXX.XXX/YY)
# Replace placeholders:
#
# Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z
# with the addresses gathered for CONSUL_SERVER_NODES
consul['configuration'] = {
retry_join: %w(Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z)
}
#
# END user configuration
```
1. [Reconfigure GitLab] for the changes to take effect.
> Please note:
- If you want your database to listen on a specific interface, change the config:
`postgresql['listen_address'] = '0.0.0.0'`
- If your Pgbouncer service runs under a different user account,
you also need to specify: `postgresql['pgbouncer_user'] = PGBOUNCER_USERNAME` in
your configuration
#### Configuring the Pgbouncer node
1. Make sure you collect [`CONSUL_SERVER_NODES`](#consul_information), [`CONSUL_PASSWORD_HASH`](#consul_information), and [`PGBOUNCER_PASSWORD_HASH`](#pgbouncer_information) before executing the next step.
1. Edit `/etc/gitlab/gitlab.rb` replacing values noted in the `# START user configuration` section:
```ruby
# Disable all components except Pgbouncer and Consul agent
bootstrap['enable'] = false
gitaly['enable'] = false
mailroom['enable'] = false
nginx['enable'] = false
redis['enable'] = false
prometheus['enable'] = false
postgresql['enable'] = false
unicorn['enable'] = false
sidekiq['enable'] = false
gitlab_workhorse['enable'] = false
gitlab_rails['auto_migrate'] = false
pgbouncer['enable'] = true
consul['enable'] = true
# Configure Pgbouncer
pgbouncer['admin_users'] = %w(pgbouncer gitlab-consul)
# Configure Consul agent
consul['watchers'] = %w(postgresql)
# START user configuration
# Please set the real values as explained in Required Information section
# Replace CONSUL_PASSWORD_HASH with with a generated md5 value
# Replace PGBOUNCER_PASSWORD_HASH with with a generated md5 value
pgbouncer['users'] = {
'gitlab-consul': {
password: 'CONSUL_PASSWORD_HASH'
},
'pgbouncer': {
password: 'PGBOUNCER_PASSWORD_HASH'
}
}
# Replace placeholders:
#
# Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z
# with the addresses gathered for CONSUL_SERVER_NODES
consul['configuration'] = {
retry_join: %w(Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z)
}
#
# END user configuration
```
1. [Reconfigure GitLab] for the changes to take effect.
#### Configuring the Application nodes
These will be the nodes running the `gitlab-rails` service. You may have other
attributes set, but the following need to be set.
1. Edit `/etc/gitlab/gitlab.rb`:
```ruby
# Disable PostgreSQL on the application node
postgresql['enable'] = false
gitlab_rails['db_host'] = 'PGBOUNCER_NODE'
gitlab_rails['db_port'] = 6432
gitlab_rails['db_password'] = 'POSTGRESQL_USER_PASSWORD'
gitlab_rails['auto_migrate'] = false
```
1. Run `sudo gitlab-ctl reconfigure` to install and configure PostgreSQL.
1. [Reconfigure GitLab] for the changes to take effect.
### Node post-configuration
After reconfigure successfully runs, the following steps must be completed to
get the cluster up and running.
#### Consul nodes post-configuration
Verify the nodes are all communicating:
```sh
/opt/gitlab/embedded/bin/consul members
```
The output should be similar to:
> **Note**: This `reconfigure` step will result in some errors.
That's OK - don't be alarmed.
```
Node Address Status Type Build Protocol DC
CONSUL_NODE_ONE XXX.XXX.XXX.YYY:8301 alive server 0.9.2 2 gitlab_consul
CONSUL_NODE_TWO XXX.XXX.XXX.YYY:8301 alive server 0.9.2 2 gitlab_consul
CONSUL_NODE_THREE XXX.XXX.XXX.YYY:8301 alive server 0.9.2 2 gitlab_consul
DATABASE_NODE_ONE XXX.XXX.XXX.YYY:8301 alive client 0.9.2 2 gitlab_consul
DATABASE_NODE_TWO XXX.XXX.XXX.YYY:8301 alive client 0.9.2 2 gitlab_consul
DATABASE_NODE_THREE XXX.XXX.XXX.YYY:8301 alive client 0.9.2 2 gitlab_consul
PGBOUNCER_NODE XXX.XXX.XXX.YYY:8301 alive client 0.9.0 2 gitlab_consul
```
#### Database nodes post-configuration
##### Primary node
Select one node as a primary node.
1. Open a database prompt:
```sh
gitlab-psql -d gitlabhq_production
```
1. Enable the `pg_trgm` extension:
```sh
CREATE EXTENSION pg_trgm;
```
su - gitlab-psql
/bin/bash
psql -h /var/opt/gitlab/postgresql -d template1
# Output:
1. Exit the database prompt by typing `\q` and Enter.
1. Verify the cluster is initialized with one node:
```sh
gitlab-ctl repmgr cluster show
```
The output should be similar to the following:
```
Role | Name | Upstream | Connection String
----------+----------|----------|----------------------------------------
* master | HOSTNAME | | host=HOSTNAME user=gitlab_repmgr dbname=gitlab_repmgr
```
1. Note down the value in the `Name` column. We will refer to it in the next section as `MASTER_NODE_NAME`.
psql (9.2.15)
Type "help" for help.
template1=#
##### Secondary nodes
1. Setup the repmgr standby:
```sh
gitlab-ctl repmgr standby setup MASTER_NODE_NAME
```
Do note that this will remove the existing data on the node. The command
has a wait time.
The output should be similar to the following:
```console
# gitlab-ctl repmgr standby setup MASTER_NODE_NAME
Doing this will delete the entire contents of /var/opt/gitlab/postgresql/data
If this is not what you want, hit Ctrl-C now to exit
To skip waiting, rerun with the -w option
Sleeping for 30 seconds
Stopping the database
Removing the data
Cloning the data
Starting the database
Registering the node with the cluster
ok: run: repmgrd: (pid 19068) 0s
```
1. Run the following command at the database prompt and you will be asked to
enter the new password for the PostgreSQL superuser.
1. Verify the node now appears in the cluster:
```sh
gitlab-ctl repmgr cluster show
```
The output should be similar to the following:
```
Role | Name | Upstream | Connection String
----------+---------|-----------|------------------------------------------------
* master | MASTER | | host=MASTER_NODE_NAME user=gitlab_repmgr dbname=gitlab_repmgr
standby | STANDBY | MASTER | host=STANDBY_HOSTNAME user=gitlab_repmgr dbname=gitlab_repmgr
```
Repeat the above steps on all secondary nodes.
#### Pgbouncer node post-configuration
1. Create a `.pgpass` file user for the `CONSUL_USER` account to be able to
reload pgbouncer. Confirm `PGBOUNCER_PASSWORD` twice when asked:
```sh
gitlab-ctl write-pgpass --host 127.0.0.1 --database pgbouncer --user pgbouncer --hostuser gitlab-consul
```
1. Ensure the node is talking to the current master:
```sh
gitlab-ctl pgb-console # You will be prompted for PGBOUNCER_PASSWORD
```
Then run:
```sh
show databases ; show clients ;
```
The output should be similar to the following:
```
name | host | port | database | force_user | pool_size | reserve_pool | pool_mode | max_connections | current_connections
---------------------+-------------+------+---------------------+------------+-----------+--------------+-----------+-----------------+---------------------
gitlabhq_production | MASTER_HOST | 5432 | gitlabhq_production | | 20 | 0 | | 0 | 0
pgbouncer | | 6432 | pgbouncer | pgbouncer | 2 | 0 | statement | 0 | 0
(2 rows)
type | user | database | state | addr | port | local_addr | local_port | connect_time | request_time | ptr | link | remote_pid | tls
------+-----------+---------------------+---------+----------------+-------+------------+------------+---------------------+---------------------+-----------+------+------------+-----
C | (nouser) | gitlabhq_production | waiting | IP_OF_APP_NODE | 56512 | 127.0.0.1 | 6432 | 2017-08-21 18:08:51 | 2017-08-21 18:08:51 | 0x22b3700 | | 0 |
C | pgbouncer | pgbouncer | active | 127.0.0.1 | 56846 | 127.0.0.1 | 6432 | 2017-08-21 18:09:59 | 2017-08-21 18:10:48 | 0x22b3880 | | 0 |
(2 rows)
```
#### Application node post-configuration
Ensure that all migrations ran:
```sh
gitlab-rake gitlab:db:configure
```
#### Ensure GitLab is running
At this point, your GitLab instance should be up and running. Verify you are
able to login, and create issues and merge requests.
### Failover procedure
By default, if the master database fails, `repmgrd` should promote one of the
standby nodes to master automatically, and consul will update pgbouncer with
the new master.
If you need to failover manually, you have two options:
**Shutdown the current master database**
Run:
```sh
gitlab-ctl stop postgresql
```
The automated failover process will see this and failover to one of the
standby nodes.
**Or perform a manual failover**
1. Ensure the old master node is not still active.
1. Login to the server that should become the new master and run:
```sh
gitlab-ctl repmgr standby promote
```
\password
# Output:
1. If there are any other standby servers in the cluster, have them follow
the new master server:
Enter new password:
Enter it again:
```sh
gitlab-ctl repmgr standby follow NEW_MASTER
```
1. Similarly, set the password for the `gitlab` database user. Use the same
password that you specified in the `/etc/gitlab/gitlab.rb` file for
`gitlab_rails['db_password']`.
### Restore procedure
If a node fails, it can be removed from the cluster, or added back as a standby
after it has been restored to service.
- If you want to remove the node from the cluster, on any other node in the
cluster, run:
```sh
gitlab-ctl repmgr standby unregister --node=X
```
\password gitlab
# Output:
where X is the value of node in `repmgr.conf` on the old server.
Enter new password:
Enter it again:
To find this, you can use:
```sh
awk -F = '$1 == "node" { print $2 }' /var/opt/gitlab/postgresql/repmgr.conf
```
1. Exit from editing `template1` prompt by typing `\q` and Enter.
1. Enable the `pg_trgm` extension within the `gitlabhq_production` database:
It will output something like:
```
959789412
```
gitlab-psql -d gitlabhq_production
CREATE EXTENSION pg_trgm;
# Output:
Then you will use this id to unregister the node:
CREATE EXTENSION
```sh
gitlab-ctl repmgr standby unregister --node=959789412
```
1. Exit the database prompt by typing `\q` and Enter.
1. Exit the `gitlab-psql` user by running `exit` twice.
1. Run `sudo gitlab-ctl reconfigure` a final time.
1. Configure the GitLab application servers with the appropriate details.
This step is covered in [Configuring GitLab for HA](gitlab.md).
- To add the node as a standby server:
```sh
gitlab-ctl repmgr standby follow NEW_MASTER
gitlab-ctl restart repmgrd
```
CAUTION: **Warning:** When the server is brought back online, and before
you switch it to a standby node, repmgr will report that there are two masters.
If there are any clients that are still attempting to write to the old master,
this will cause a split, and the old master will need to be resynced from
scratch by performing a `standby setup NEW_MASTER`.
### Alternate configurations
#### Database authorization
By default, we give any host on the database network the permission to perform
repmgr operations using PostgreSQL's `trust` method. If you do not want this
level of trust, there are alternatives.
You can trust only the specific nodes that will be database clusters, or you
can require md5 authentication.
##### Trust specific addresses
If you know the IP address, or FQDN of all database and pgbouncer nodes in the
cluster, you can trust only those nodes.
In `/etc/gitlab/gitlab.rb` on all of the database nodes, set
`repmgr['trust_auth_cidr_addresses']` to an array of strings containing all of
the addresses.
If setting to a node's FQDN, they must have a corresponding PTR record in DNS.
If setting to a node's IP address, specify it as `XXX.XXX.XXX.XXX/32`.
For example:
```ruby
repmgr['trust_auth_cidr_addresses'] = %w(192.168.1.44/32 db2.example.com)
```
##### MD5 Authentication
If you are running on an untrusted network, repmgr can use md5 authentication
with a [.pgpass file](https://www.postgresql.org/docs/9.6/static/libpq-pgpass.html)
to authenticate.
You can specify by IP address, FQDN, or by subnet, using the same format as in
the previous section:
1. On the current master node, create a password for the `gitlab` and
`gitlab_repmgr` user:
```sh
gitlab-psql -d template1
template1=# \password gitlab_repmgr
Enter password: ****
Confirm password: ****
template1=# \password gitlab
```
1. On each database node:
1. Edit `/etc/gitlab/gitlab.rb`:
1. Ensure `repmgr['trust_auth_cidr_addresses']` is **not** set
1. Set `postgresql['md5_auth_cidr_addresses']` to the desired value
1. Set `postgresql['sql_replication_user'] = 'gitlab_repmgr'`
1. Reconfigure with `gitlab-ctl reconfigure`
1. Restart postgresql with `gitlab-ctl restart postgresql`
1. Create a `.pgpass` file. Enter the `gitlab_repmgr` password twice to
when asked:
```sh
gitlab-ctl write-pgpass --user gitlab_repmgr --hostuser gitlab-psql --database '*'
```
1. On each pgbouncer node, edit `/etc/gitlab/gitlab.rb`:
1. Ensure `gitlab_rails['db_password']` is set to the plaintext password for
the `gitlab` database user
1. [Reconfigure GitLab] for the changes to take effect
### Troubleshooting
#### Consul and PostgreSQL changes not taking effect.
Due to the potential impacts, `gitlab-ctl reconfigure` only reloads Consul and PostgreSQL, it will not restart the services. However, not all changes can be activated by reloading.
To restart either service, run `gitlab-ctl restart SERVICE`
For PostgreSQL, it is usually safe to restart the master node by default. Automatic failover defaults to a 1 minute timeout. Provided the database returns before then, nothing else needs to be done. To be safe, you can stop `repmgrd` on the standby nodes first with `gitlab-ctl stop repmgrd`, then start afterwards with `gitlab-ctl start repmgrd`.
On the consul server nodes, it is important to restart the consul service in a controlled fashion. Read our [consul documentation](consul.md#restarting-the-server-cluster) for instructions on how to restart the service.
#### Issues with other components
If you're running into an issue with a component not outlined here, be sure to check the troubleshooting section of their specific documentation page.
- [Consul](consul.md#troubleshooting)
- [PostgreSQL](http://docs.gitlab.com/omnibus/settings/database.html#troubleshooting)
- [GitLab application](gitlab.md#troubleshooting)
## Configure using Omnibus
**Note**: We recommend that you follow the instructions here for a full [PostgreSQL cluster](#configure_using_omnibus_for_high_availability).
If you are reading this section due to an old bookmark, you can find that old documentation [in the repository](https://gitlab.com/gitlab-org/gitlab-ce/blob/v10.1.4/doc/administration/high_availability/database.md#configure-using-omnibus).
---
......@@ -126,3 +723,6 @@ Read more on high-availability configuration:
1. [Configure NFS](nfs.md)
1. [Configure the GitLab application servers](gitlab.md)
1. [Configure the load balancers](load_balancer.md)
1. [Manage the bundled Consul cluster](consul.md)
[reconfigure GitLab]: ../restart_gitlab.md#omnibus-gitlab-reconfigure
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