tsuru-bluegreen 
A blue-green deployment plugin for tsuru client
Dependencies
Python 2.7
Installation
tsuru plugin-install bluegreen https://raw.githubusercontent.com/emerleite/tsuru-bluegreen/1.2.1/src/bluegreen.py
Deployment methods
By default, the plugin deploys using git push. But if you define a deploy_dir key, inside the Application section of the configuration file, it uses tsuru app-deploy command instead.
Configuration
Tsuru bluegreen uses convention over configuration. It assumes your application backend is named using blue and green sufixes, as explained bellow:
Create a tsuru-bluegreen.ini in your application root with the following configuration:
[Application]
name: <your_app>
deploy_dir: <./build>
[NewRelic]
api_key: <newrelic_api_key>
app_id: <newrelic_app_id>
[Grafana]
endpoint: <logstash_endpoint>
index: <logstash_index>
[WebHook]
endpoint: http://example.com
payload_extras: key1=value1&key2=value2
[Hooks]
before_pre: <command to run before 'pre' action>
after_pre: <command to run after a successful 'pre' action>
before_swap: <command to run before 'swap' action>
after_swap: <command to run after a successful 'swap' action>
'Application' section
Based on the name configuration value, you must have to have two tsuru applications and git remotes named: your_app**-blue** and your_app**-green**.
The deploy_dir configuration value is used with the --app-deploy flag. The default value is ..
'NewRelic' section
Notify New Relic about your deployment after swap. See NewRelic docs.
'Grafana' section
Notify Grafana about your deployment after swap. See Grafana docs.
'WebHook' section
POST to a WebHook after deployment swap. The payload is the defined payload_extras plus tag=<tag_value>.
'Hooks' section
Hooks are optional. They are ran before or after the corresponding actions, and everything sent to stdout and stderr is ignored. If a before hook fails (return value isn't zero), the action (pre/swap) is cancelled. If you want to run the pre/swap action independently of the before hook execution, you need to make sure it always returns 0.
Hooks must run inside a shell. If you want to run a curl command, for instance, you should do it inside a shell script:
$ cat script.sh
#! /bin/sh
curl http://example.com
$ cat tsuru-bluegreen.ini
[Application]
name: test
[Hooks]
before_pre: ./script.sh
$ tsuru bluegreen pre -t some-tag
In this case, if curl command fails, the pre action will be cancelled.
Example
$ tsuru app-list
+---------------+-------------------------+---------------------------------------------------+--------+
| Application | Units State Summary | Address | Ready? |
+---------------+-------------------------+---------------------------------------------------+--------+
| sample-blue | 4 of 4 units in-service | sample.example.com, sample-blue.cloud.example.com | Yes |
| sample-green | 0 of 0 units in-service | sample-green.cloud.globoi.com | Yes |
+---------------+-------------------------+---------------------------------------------------+--------+
$ git remote
sample-blue
sample-green
Usage
tsuru bluegreen --help
usage: tsuru bluegreen action [options]
Tsuru blue-green deployment (pre and live).
positional arguments:
action pre or swap
optional arguments:
-h, --help show this help message and exit
-t [TAG], --tag [TAG] Tag to be deployed (default: master)
Tests
$ pip install -r test_requirements.txt
$ nosetests test/*.py
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