CODEWITHSUNDEEP
bashshelldockerdocker-compose
user11608070
user11608070

Reputation:

Bash: get a list of container names from docker-compose.yml

I have my containers scattered into multiple docker-compose.yml files (https://docs.docker.com/compose/extends/). They are separated based on the project, but a few containers are common to all projects. I have a neat shell script which lets me easily start a few projects at a time:

./myscript.sh up project1 project2

This executes:

docker-compose up -d -f shared/docker-compose.yml -f project1/docker-compose.yml -f project2/docker-compose.yml project1 project2

This starts the containers project1, project2 & a few that are defined in the shared compose file, e.g. shared-db, shared-apache.

I now want to add to my shell script the option to kill the containers:

./myscript.sh kill

Should execute:

docker kill project1 project2 shared-db shared-apache

The problem is getting the list of my containers. My current approach is to use docker ps --format '{{.Names}}', which isn't ideal as it can list also containers that are not a part of these projects.

I've also tried using docker-compose kill, which needs to be executed for each docker-compose.yml file separately. I looped through all the files and it worked for the first one, but threw an error for the second:

ERROR: Service 'project1' depends on service 'shared-db' which is undefined.

The error is thrown because project1/docker-compose.yml has dependencies from shared/docker-compose.yml and they are unmet because shared was already killed.

The only way that comes to mind is somehow go through all the docker-compose.yml files and get a list of all the container names that are defined there, but I didn't find any proper way to parse yml files in bash. 

services:
  db:
    image: ...
    container_name: shared-db

  apache:
    image: ...
    container_name: shared-apache

From the above yml, I'd have to get the names shared-db and shared-apache.

Upvotes: 1

Views: 2404

Answers (3)

KamilCuk
KamilCuk

Reputation: 141165

Just use docker-compose kill:

docker-compose -f shared/docker-compose.yml -f project1/docker-compose.yml -f project2/docker-compose.yml kill

The option -f should come before the command to docker-compose, that way it will be parsed as include files. You can use all possible docker-compose commands that way.

Upvotes: 1

user11608070
user11608070

Reputation: 

grep container_name: */docker-compose.yml | awk '{print $3}'

or:

grep container_name: */docker-compose.yml | sed 's/^.*: //'

Upvotes: 1

larsks
larsks

Reputation: 311711

As long as you are happy with myscript.sh kill killing any container started with docker-compose, you can use the labels that docker-compose applies to containers to identify targets.

To find all containers started using docker-compose:

docker ps --filter 'label=com.docker.compose.project'

So you could do something as simple as:

docker ps --filter 'label=com.docker.compose.project' -q |
xargs docker kill

See the docker ps documenation on filtering for more information.

Upvotes: 2

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