Question 82715 in Docker Question posted in
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How to run a shell command on all containers of a replicated docker-compose service?

I am running spark workers using docker, replicated using a docker-compose setup:

version: '2'

services:
  spark-worker:
    image: bitnami/spark:latest
    environment:
      - SPARK_MODE=worker
      - SPARK_MASTER_URL=spark://1.1.1.1:7077
    deploy:
      mode: replicated
      replicas: 4

When I run docker-compose exec spark-worker ls, for example, it only runs on usually the first replica. Is there a way to broadcast these commands to all of the replicas?

docker-compose version 1.29.2, build 5becea4c

Docker version 20.10.7, build f0df350

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2

Answers


  1. 0

    There’s no built-in facility for this, but you could construct something fairly easily. For example:

    docker ps -q --filter label=com.docker.compose.service=spark-worker |
xargs -ICID docker exec CID ls
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  2. 0

    I would propose a simpler command than what @larsks proposed, which leverages the docker-compose command itself.

    SERVICE_NAME=spark-worker
for id in $(docker-compose ps -q $SERVICE_NAME); do
    docker exec -t $id "echo" "hello"
done;
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