Update patroni documenation with api auth configuration

doc/administration/geo/setup/database.md

@@ -567,6 +567,8 @@ Leader instance**:
    patroni['use_pg_rewind'] = true
    patroni['postgresql']['max_wal_senders'] = 8 # Use double of the amount of patroni/reserved slots (3 patronis + 1 reserved slot for a Geo secondary).
    patroni['postgresql']['max_replication_slots'] = 8 # Use double of the amount of patroni/reserved slots (3 patronis + 1 reserved slot for a Geo secondary).
+   patroni['username'] = 'PATRONI_API_USERNAME'
+   patroni['password'] = 'PATRONI_API_PASSWORD'
    patroni['replication_password'] = 'PLAIN_TEXT_POSTGRESQL_REPLICATION_PASSWORD'
 
    # We list all secondary instances as they can all become a Standby Leader
@@ -727,6 +729,8 @@ For each Patroni instance on the secondary site:
    patroni['standby_cluster']['host'] = 'INTERNAL_LOAD_BALANCER_PRIMARY_IP'
    patroni['standby_cluster']['port'] = INTERNAL_LOAD_BALANCER_PRIMARY_PORT
    patroni['standby_cluster']['primary_slot_name'] = 'geo_secondary' # Or the unique replication slot name you setup before
+   patroni['username'] = 'PATRONI_API_USERNAME'
+   patroni['password'] = 'PATRONI_API_PASSWORD'
    patroni['replication_password'] = 'PLAIN_TEXT_POSTGRESQL_REPLICATION_PASSWORD'
    patroni['use_pg_rewind'] = true
    patroni['postgresql']['max_wal_senders'] = 5 # A minimum of three for one replica, plus two for each additional replica
@@ -900,6 +904,8 @@ For each Patroni instance on the secondary site for the tracking database:
    ]
 
    # Patroni configuration
+   patroni['username'] = 'PATRONI_API_USERNAME'
+   patroni['password'] = 'PATRONI_API_PASSWORD'
    patroni['replication_password'] = 'PLAIN_TEXT_POSTGRESQL_REPLICATION_PASSWORD'
    patroni['postgresql']['max_wal_senders'] = 5 # A minimum of three for one replica, plus two for each additional replica
 

doc/administration/postgresql/replication_and_failover.md

@@ -157,6 +157,13 @@ We will need the following password information for the application's database u
   sudo gitlab-ctl pg-password-md5 POSTGRESQL_USERNAME
   ```
 
+#### Patroni information
+
+We will need the following password information for the Patroni API:
+
+- `PATRONI_API_USERNAME`. A username for basic auth to the API
+- `PATRONI_API_PASSWORD`. A password for basic auth to the API
+
 #### PgBouncer information
 
 When using default setup, minimum configuration requires:
@@ -236,6 +243,11 @@ postgresql['sql_replication_password'] = 'POSTGRESQL_REPLICATION_PASSWORD_HASH'
 # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
 postgresql['sql_user_password'] = 'POSTGRESQL_PASSWORD_HASH'
 
+# Replace PATRONI_API_USERNAME with a username for Patroni Rest API calls (use the same username in all nodes)
+patroni['username'] = 'PATRONI_API_USERNAME'
+# Replace PATRONI_API_PASSWORD with a password for Patroni Rest API calls (use the same password in all nodes)
+patroni['password'] = 'PATRONI_API_PASSWORD'
+
 # Sets `max_replication_slots` to double the number of database nodes.
 # Patroni uses one extra slot per node when initiating the replication.
 patroni['postgresql']['max_replication_slots'] = X
@@ -555,6 +567,8 @@ gitlab_rails['auto_migrate'] = false
 
 postgresql['pgbouncer_user_password'] = '771a8625958a529132abe6f1a4acb19c'
 postgresql['sql_user_password'] = '450409b85a0223a214b5fb1484f34d0f'
+patroni['username'] = 'PATRONI_API_USERNAME'
+patroni['password'] = 'PATRONI_API_PASSWORD'
 patroni['postgresql']['max_replication_slots'] = 6
 patroni['postgresql']['max_wal_senders'] = 7
 
@@ -642,6 +656,9 @@ postgresql['sql_user_password'] = '450409b85a0223a214b5fb1484f34d0f'
 # Patroni uses one extra slot per node when initiating the replication.
 patroni['postgresql']['max_replication_slots'] = 6
 
+patroni['username'] = 'PATRONI_API_USERNAME'
+patroni['password'] = 'PATRONI_API_PASSWORD'
+
 # Set `max_wal_senders` to one more than the number of replication slots in the cluster.
 # This is used to prevent replication from using up all of the
 # available database connections.

doc/administration/reference_architectures/10k_users.md

@@ -598,6 +598,10 @@ in the second step, do not supply the `EXTERNAL_URL` value.
    # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
    postgresql['sql_user_password'] = '<postgresql_password_hash>'
 
+   # Set up basic authentication for the Patroni API (use the same username/password in all nodes).
+   patroni['username'] = '<patroni_api_username>'
+   patroni['password'] = '<patroni_api_password>'
+
    # Replace XXX.XXX.XXX.XXX/YY with Network Address
    postgresql['trust_auth_cidr_addresses'] = %w(10.6.0.0/24)
 

doc/administration/reference_architectures/25k_users.md

@@ -600,6 +600,10 @@ in the second step, do not supply the `EXTERNAL_URL` value.
    # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
    postgresql['sql_user_password'] = '<postgresql_password_hash>'
 
+   # Set up basic authentication for the Patroni API (use the same username/password in all nodes).
+   patroni['username'] = '<patroni_api_username>'
+   patroni['password'] = '<patroni_api_password>'
+
    # Replace XXX.XXX.XXX.XXX/YY with Network Address
    postgresql['trust_auth_cidr_addresses'] = %w(10.6.0.0/24)
 

doc/administration/reference_architectures/3k_users.md

@@ -882,6 +882,10 @@ in the second step, do not supply the `EXTERNAL_URL` value.
    # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
    postgresql['sql_user_password'] = '<postgresql_password_hash>'
 
+   # Set up basic authentication for the Patroni API (use the same username/password in all nodes).
+   patroni['username'] = '<patroni_api_username>'
+   patroni['password'] = '<patroni_api_password>'
+
    # Replace XXX.XXX.XXX.XXX/YY with Network Address
    postgresql['trust_auth_cidr_addresses'] = %w(10.6.0.0/24)
 

doc/administration/reference_architectures/50k_users.md

@@ -608,6 +608,10 @@ in the second step, do not supply the `EXTERNAL_URL` value.
    # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
    postgresql['sql_user_password'] = '<postgresql_password_hash>'
 
+   # Set up basic authentication for the Patroni API (use the same username/password in all nodes).
+   patroni['username'] = '<patroni_api_username>'
+   patroni['password'] = '<patroni_api_password>'
+
    # Replace XXX.XXX.XXX.XXX/YY with Network Address
    postgresql['trust_auth_cidr_addresses'] = %w(10.6.0.0/24)
 

doc/administration/reference_architectures/5k_users.md

@@ -873,6 +873,10 @@ in the second step, do not supply the `EXTERNAL_URL` value.
    # Replace POSTGRESQL_PASSWORD_HASH with a generated md5 value
    postgresql['sql_user_password'] = '<postgresql_password_hash>'
 
+   # Set up basic authentication for the Patroni API (use the same username/password in all nodes).
+   patroni['username'] = '<patroni_api_username>'
+   patroni['password'] = '<patroni_api_password>'
+
    # Replace XXX.XXX.XXX.XXX/YY with Network Address
    postgresql['trust_auth_cidr_addresses'] = %w(10.6.0.0/24)