Simplify Amazon ECS deployments
Redeploying a service in Amazon ECS causes some effort, even if you just want to pull the most recent image versions. You have to create a new revision of the task definition and update the service to use the newly created revision.
This project simplyfies deployments on Amazon ECS by providing a convinience CLI tool for actions, which are executed pretty often.
Redeploy or scale a service in Amazon ECS as simple as this:
$ ecs deploy my-cluster my-service --tag latest $ ecs scale my-cluster my-service 4
The project is availably on PyPI. Simply run:
$ pip install ecs-deploy
As ecs-deploy is based on boto3 (the official AWS Python library), there are several ways to configure and store the authentication credentials. Please read the boto3 documentation for more details (http://boto3.readthedocs.org/en/latest/guide/configuration.html#configuration). The simplest way is by running:
$ aws configure
Alternatively you can pass the AWS credentials (via –access-key-id and –secret-access-key) or the AWS configuration profile (via –profile) as options when you run ecs.
Currently the following actions are supported:
Redeploy a service either without any modifications or with a new image, environment variable and/or command definition.
Scale a service up or down and change the number of running tasks.
For detailed information about the available actions, arguments and options, run:
$ ecs deploy --help $ ecs scale --help
All examples assume, that authentication has already been configured.
To redeploy a service without any modifications, but pulling the most recent image versions, run the follwing command. This will duplicate the current task definition and cause the service to redeploy all running tasks.:
$ ecs deploy my-cluster my-service
Deploy a new tag
To change the tag for all images in all containers in the task definition, run the following command:
$ ecs deploy my-cluster my-service -t 1.2.3
Deploy a new image
To change the image of a specific container, run the following command:
$ ecs deploy my-cluster my-service --image webserver nginx:latest
This will modify the webserver container only and change its image to “nginx:latest”.
Deploy several new image
The -i or –image option can also be passed several times:
$ ecs deploy my-cluster my-service -i webserver nginx:1.9 -i application django:latest
This will change the webserver’s container image to “nginx:1.9” and the application’s image to “django:latest”.
Set an environment variable
To add a new or adjust an existing environment variable of a specific container, run the following command:
$ ecs deploy my-cluster my-service -e webserver SOME_VARIABLE SOME_VALUE
This will modify the webserver container definition and add or overwrite the environment variable SOME_VARIABLE with the value “SOME_VALUE”. This way you can add new or adjust already existing environment variables.
Adjust multiple environment variables
You can add or change multiple environment variables at once, by adding the -e (or –env) options several times:
$ ecs deploy my-cluster my-service -e webserver SOME_VARIABLE SOME_VALUE -e webserver OTHER_VARIABLE OTHER_VALUE -e app APP_VARIABLE APP_VALUE
This will modify the definition of two containers. The webserver’s environment variable SOME_VARIABLE will be set to “SOME_VALUE” and the variable OTHER_VARIABLE to “OTHER_VALUE”. The app’s environment variable APP_VARIABLE will be set to “APP_VALUE”.
Modify a command
To change the command of a specific container, run the following command:
$ ecs deploy my-cluster my-service --command webserver "nginx"
This will modify the webserver container and change its command to “nginx”.
Scale a service
To change the number of running tasks and scale a service up and down, run this command:
$ ecs scale my-cluster my-service 4
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