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+# 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`