Where is the docker swarm token stored?

Question

I've created a docker-machine swarm cluster using a new generated token, which was stored within an environment variable. The environment variable was only for valid for the current session, and is deleted afterward. Now I want to add a new docker-machine to the same cluster, but I can't find the needed token.

How is it possible to find out the token used by an active docker swarm ?

score 49 · Accepted Answer · edited Sep 26 '17 at 02:04

Answering for posterity, since I had no luck with the other answer.

Running Docker 17.05. Docker can now list join tokens for both workers and managers.

$ docker swarm join-token manager

To add a manager to this swarm, run the following command:

docker swarm join \
--token SWMTKN-1-13z9uafwgjdkfv3ik18ttceqgtogdqr4xurhc6vaybeckx7i7u-2lnnyzeqb93ejgjrdlivsg7rf \
10.0.0.18:2377



$ docker swarm join-token worker
To add a worker to this swarm, run the following command:

docker swarm join \
--token SWMTKN-1-13z9uafwgjdkfv3ik18ttceqgtogdqr4xurhc6vaybeckx7i7u-b3a28we1he23rxwk2rea933y4 \
10.0.0.18:2377

More information: https://docs.docker.com/engine/reference/commandline/swarm_join-token/

score 2 · Answer 2 · answered Oct 09 '15 at 13:19

2

This article explains how this can be achieved:

Getting the Docker Swarm Discovery Token

Execute: docker inspect $SWARM_AGENT_MASTER where $SWARM_AGENT_MASTER is the name of the container.

answered Oct 09 '15 at 13:19

alliancecoder

86
1
15

Thanks a lot, that's exactly what I looked for. – Sabbane Oct 09 '15 at 13:29

score 2 · Answer 3 · answered Oct 20 '17 at 01:27

Just ssh into manager and get the tokens, like the following.

# get manager and worker tokens
 export MANAGER_TOKEN=`docker-machine ssh $SWARM_AGENT_MASTER "docker swarm join-token manager -q"`
 export WORKER_TOKEN=`docker-machine ssh $SWARM_AGENT_MASTER "docker swarm join-token worker -q"`

Where is the docker swarm token stored?

3 Answers3