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An example of a complex, multi-host Salt Orchestrate state that performs status checks as it goes
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{% set backends = [ 'colo.dash', 'colo.flash' ] %} | |
{% set applications = [ 'willow_api', 'willow_services' ] %} | |
#### | |
# Loop through the applications, and for each loop through the backends | |
#### | |
{% for application in applications %} | |
{% for backend in backends %} | |
{% set pillar_data = salt['saltutil.runner']('pillar.show_pillar', minion=backend)['applications'] %} | |
{% set ip = pillar_data.ip %} | |
{% set application_data = pillar_data[application] %} | |
{% if application_data.port is not number %} | |
{% do salt.test.exception('The port ' + str(application_data.port) + ' is not valid.' ) %} | |
{% endif %} | |
haproxy_stop_{{ application }}_{{ backend }}: | |
salt.function: | |
- tgt: smash* | |
- name: haproxy.disable_server | |
- arg: | |
- {{ backend }} | |
- {{ application }} | |
# Deploy the application | |
upgrade_{{ application }}_{{ backend }}: | |
salt.state: | |
- tgt: {{ backend }} | |
- highstate: True | |
# Using prereq here prevents stopping haproxy if the highstate run | |
# above will not produce any changes! I.e., if we're already running the | |
# right version then the Orchestrate loop for this node does nothing. | |
- prereq_in: | |
- haproxy_stop_{{ application }}_{{ backend }} | |
# Wait for the new application to become available by repeatedly trying to | |
# connect to the host and port that it will be running on. | |
application_test_{{ application }}_{{ backend }}: | |
http.wait_for_successful_query: | |
- name: http://{{ ip }}:{{ application_data.port }}{{ application_data.check_path }} | |
- request_interval: 5 | |
- status: 200 | |
- match: {{ application_data.version }} | |
- require: | |
- upgrade_{{ application }}_{{ backend }} | |
haproxy_start_{{ application }}_{{ backend }}: | |
salt.function: | |
- tgt: smash* | |
- name: haproxy.enable_server | |
- arg: | |
- {{ backend }} | |
- {{ application }} | |
- require: | |
- application_test_{{ application }}_{{ backend }} | |
failure_abort_{{ application }}_{{ backend }}: | |
module.run: | |
- name: test.exception | |
- message: 'Error deploying {{ application }} to {{ backend }}. Before trying again check the loadbalancer might be in MAINT mode' | |
{# failhard here will abort the Orchestrate run early. #} | |
- failhard: True | |
{% endfor %} | |
{% endfor %} |
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