CODEWITHSUNDEEP
dockergoogle-compute-enginedocker-machinedocker-swarm
user1932582
user1932582

Reputation: 61

Docker swarm-manager displays old container information

I am using docker-machine with Google Compute Engine(GCE) to run a
docker swarm cluster. I created a swarm successfully with 2 nodes
(swnd-01 & swnd-02) in the cluster. I created a daemon container like this
in the swarm-manager environment:
docker run -d ubuntu /bin/bash

docker ps shows the container running on swnd-01. When I tried
executing a command over the container using docker exec I get the
error that container is not running while docker ps shows otherwise.
I ssh'ed into swnd-01 via docker-machine to come to know that container
exited as soon as it was created. I tried docker run command inside the
swnd-01 but it still exits. I don't understand the behavior.

Any suggestions will be thankfully received.

Upvotes: 2

Views: 148

Answers (1)

Adrian Mouat
Adrian Mouat

Reputation: 46548

The reason it exits is that the /bin/bash command completes and a Docker container only runs as long as its main process (if you run such a container with the -it flags the process will keep running while the terminal is attached).

As to why the swarm manager thought the container was still running, I'm not sure. I guess there is a short delay while Swarm updates the status of everything.

Upvotes: 1

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