Blue Green Deployment support scripts

Function

Read Fowler about Blue Green Deployment https://martinfowler.com/bliki/BlueGreenDeployment.html

WorkFlow

1. Initialize structure

By default folder structure of all BGD complex is like that:

|- /opt/
|  |- blue-gree-deployment/          <- current project folder
|  |- projects/                      <- projects folder (docker-compose instances for projects)
|  |  |- project-name/               <- current project folder
|  |  |  |- logs/                    <- logs folder
|  |  |  |- {test,stage,production}/ <- stage folder
|  |  |  |  |- {green,blue}/         <- instance folder. Here docker-compose folder is cloned
|
|- /etc/nginx/
|  |- site-available/
|  |  |- project-name/                <- current project folder
|  |  |  |- {test,stage,production}/  <- stage folder
|  |  |  |  |- {green,blue}           <- proxy configs
|  |- site-enabled/
|  |  |- project-name/                <- current project folder
|  |  |  |- {test,stage,production}/  <- stage folder
|  |  |  |  |- {green,blue}           <- symlink to config file (blue or green) in available folder

Running init.sh script will deploy this structure. Options to pass to init.sh:

• -p projectName - name for project folders in BGD structure
• -h baseHostName - base host name for project that will work like *.example.com, where * will be project stage
• -r git@path-to-docker-compose-repo.git - git path to docker-compose project. It will be cloned into every instance folder

After initialization your should configure every instance of docker-compose for all stages for the project.

Init script will create two files for your server:

• .env - main paths to BGD and projects
• .used-ports - here will be stored used by BGD ports for nginx proxy

If you want to customize variables in this files, you can make them from examples.

2. Instance switching

/opt/blue-green-deployment/switch.sh -p projectName -i stage

3. Database migrations

/opt/blue-green-deployment/migrate.sh -p projectName -i stage

4. Fallback without update

/opt/blue-green-deployment/fallback.sh -p projectName -i stage