# docker swarm

> A container orchestration tool.
> More information: <https://docs.docker.com/engine/swarm/>.

- Initialize a swarm cluster:

`docker swarm init`

- Display the token to join a manager or a worker:

`docker swarm join-token {{worker|manager}}`

- Join a new node to the cluster:

`docker swarm join --token {{token}} {{manager_node_url:2377}}`

- Remove a worker from the swarm (run inside the worker node):

`docker swarm leave`

- Display the current CA certificate in PEM format:

`docker swarm ca`

- Rotate the current CA certificate and display the new certificate:

`docker swarm ca --rotate`

- Change the valid period for node certificates:

`docker swarm update --cert-expiry {{hours}}h{{minutes}}m{{seconds}}s`