instance.cfg.in 4.68 KB
#############################
#
# Deploy hello-world instance
#
#############################
[buildout]
parts =
  directory
  publish-connection-parameter

# Define egg directories to be the one from Software Release
# (/opt/slapgrid/...)
# Always the same.
eggs-directory = {{ buildout['eggs-directory'] }}
develop-eggs-directory = {{ buildout['develop-eggs-directory'] }}
offline = true


[instance-parameter]
# Fetch arbitrary parameters defined by the user in SlapOS Master for his instance.
# We use the slapconfiguration recipe with a few parameters (partition id,
# computer id, certificate, etc).
# It will then authenticate to SlapOS Master and fetch the instance parameters.
# The parameters are accessible from ${instance-parameter:configuration.name-of-parameter}
# Always the same. Just copy/paste.
# See docstring of slapos.cookbook:slapconfiguration for more information.
recipe = slapos.cookbook:slapconfiguration
computer = ${slap_connection:computer_id}
partition = ${slap_connection:partition_id}
url = ${slap_connection:server_url}
key = ${slap_connection:key_file}
cert = ${slap_connection:cert_file}

# Define default parameter(s) that will be used later, in case user didn't
# specify it.
# All possible parameters should have a default.
# In our use case, we are expecting from the user to specify one (optional) parameter: "name". We put the default value here if he doesn't specify it, so that it doesn't crash.
configuration.name = John Doe
# If our use case requires that the user can specify a mail address so that his instance can mail to him (for example), we can do:
# configuration.mail-address =
# If the user doesn't specify it, it won't break and the recipe can handle it (i.e don't send any mail for example).


# Create all needed directories, depending on your needs
[directory]
recipe = slapos.cookbook:mkdirectory
home = ${buildout:directory}
etc = ${:home}/etc
var = ${:home}/var
# Executables put here will be started but not monitored (for startup scripts)
script = ${:etc}/run/
# Executables put here will be started and monitored (for daemons)
service = ${:etc}/service
# Executables put here will be launched after buildout has completed to see
# if instance is running
promise = ${:etc}/promise/
# Path of the log directory used by our service (see [helloweb])
log = ${:var}/log


# Create a simple web server that says "hello <configuration.name>" to the web.
[helloweb]
# helloworld service is listening on:
# - global IPv6 address, and
# - fixed port
#
# NOTE because every computer partition is allocated its own global IPv6
# address, it is ok to fix the port - different hello-world instances will have
# different IPv6 addresses and they all will be accessible at the same time.
ipv6 = ${instance-parameter:ipv6-random}
# full URL - for convenience
url = http://[${:ipv6}]:${:port}

# the service will log here
logfile = ${directory:log}/helloweb-${:kind}.log

# Actual script that starts the service:
# This recipe will try to "exec" the command-line after separating parameters.
recipe = slapos.cookbook:wrapper
command-line =
    {{ buildout['bin-directory'] }}/helloweb-${:kind} --logfile ${:logfile}
        ${:ipv6} ${:port} ${instance-parameter:configuration.name}
# Put this shell script in the "etc/service" directory. Each executable of this
# repository will be started and monitored by supervisord. If a service
# exits/crashes, it will trigger a "bang" and cause a re-run of the instance.
wrapper-path = ${directory:service}/helloweb-${:kind}


# promise, that checks that helloweb service is alive
[helloweb-promise]
recipe = slapos.cookbook:check_port_listening
path = ${directory:promise}/helloweb-${:kind}

{# macro to instantiate service of `kind` to listen on `port` #}
{% set service_list = [] %}
{% macro hellowebsrv(kind, port) %}
{% do service_list.append(kind) %}
[helloweb-{{ kind }}]
<= helloweb
kind    = {{ kind }}
port    = {{ port }}

[helloweb-{{ kind }}-promise]
<= helloweb-promise
kind    = {{ kind }}
hostname= ${helloweb-{{ kind }}:ipv6}
port    = {{ port }}
{% endmacro %}

# services instantiation
{{ hellowebsrv('python', 7777) }}
{{ hellowebsrv('ruby',   7778) }}
{{ hellowebsrv('go',     7779) }}


# register all services/promises to buildout parts
[buildout]
parts +=
{%- for kind in service_list %}
  helloweb-{{ kind }}
  helloweb-{{ kind }}-promise
{%- endfor %}


# Publish all the parameters needed for the user to connect to the instance.
# It can be anything: URL(s), password(s), or arbitrary parameters.
# Here we'll just echo back the entered name as instance parameter
[publish-connection-parameter]
recipe = slapos.cookbook:publish
name = Hello ${instance-parameter:configuration.name}!
{%- for kind in service_list %}
url.{{ kind }} = ${helloweb-{{ kind }}:url}
{%- endfor %}