Usage: docker swarm join-token [--rotate] (worker|manager) Manage join tokens Options: --help Print usage -q, --quiet Only display token --rotate Rotate join token
Join tokens are secrets that allow a node to join the swarm. There are two different join tokens available, one for the worker role and one for the manager role. You pass the token using the
--token flag when you run swarm join. Nodes use the join token only when they join the swarm.
You can view or rotate the join tokens using
As a convenience, you can pass
manager as an argument to
join-token to print the full
docker swarm join command to join a new node to the swarm:
$ docker swarm join-token worker To add a worker to this swarm, run the following command: docker swarm join \ --token SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-1awxwuwd3z9j1z3puu7rcgdbx \ 172.17.0.2:2377 $ docker swarm join-token manager To add a manager to this swarm, run the following command: docker swarm join \ --token SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-7p73s1dx5in4tatdymyhg9hu2 \ 172.17.0.2:2377
--rotate flag to generate a new join token for the specified role:
$ docker swarm join-token --rotate worker To add a worker to this swarm, run the following command: docker swarm join \ --token SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-b30ljddcqhef9b9v4rs7mel7t \ 172.17.0.2:2377
--rotate, only the new token will be valid for joining with the specified role.
--quiet) flag only prints the token:
$ docker swarm join-token -q worker SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-b30ljddcqhef9b9v4rs7mel7t
Because tokens allow new nodes to join the swarm, you should keep them secret. Be particularly careful with manager tokens since they allow new manager nodes to join the swarm. A rogue manager has the potential to disrupt the operation of your swarm.
Rotate your swarm's join token if a token gets checked-in to version control, stolen, or a node is compromised. You may also want to periodically rotate the token to ensure any unknown token leaks do not allow a rogue node to join the swarm.
To rotate the join token and print the newly generated token, run
docker swarm join-token --rotate and pass the role:
Rotating a join-token means that no new nodes will be able to join the swarm using the old token. Rotation does not affect existing nodes in the swarm because the join token is only used for authorizing new nodes joining the swarm.
Only print the token. Do not print a complete command for joining.