list — List the nodes in a cluster

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Use list to display a list of the nodes in a cluster.

To list the nodes in a cluster, use the following syntax:

docker run swarm list [OPTIONS] <discovery>

The following examples show a few different syntaxes for the <discovery> argument:

etcd:

swarm list etcd://<etcd_addr1>,<etcd_addr2>/<optional path prefix> <node_ip:port>

Consul:

swarm list consul://<consul_addr>/<optional path prefix> <node_ip:port>

ZooKeeper:

swarm list zk://<zookeeper_addr1>,<zookeeper_addr2>/<optional path prefix> <node_ip:port>

Arguments

The list command has only one argument:

<discovery> — Discovery backend

When you use the list command, use the <discovery> argument to specify one of the following discovery backends:

  • token://<token>
  • consul://<ip1>/<path>
  • etcd://<ip1>,<ip2>,<ip2>/<path>
  • file://<path/to/file>
  • zk://<ip1>,<ip2>/<path>
  • [nodes://]<iprange>,<iprange>

Where:

  • <token> is a discovery token generated by Docker Hub’s hosted discovery service. To generate this discovery token, use the create command. > Warning: Docker Hub’s hosted discovery backend is not recommended for production use. It’s intended only for testing/development.

  • ip1, ip2, ip3 are each the IP address and port numbers of a discovery backend node.
  • path (optional) is a path to a key-value store on the discovery backend. When you use a single backend to service multiple clusters, you use paths to maintain separate key-value stores for each cluster.
  • path/to/file is the path to a file that contains a static list of the Swarm managers and nodes that are members the cluster.
  • iprange is an IP address or a range of IP addresses followed by a port number.

For example:

  • A discovery token: token://0ac50ef75c9739f5bfeeaf00503d4e6e
  • A Consul node: consul://172.30.0.165:8500

The environment variable for <discovery> is $SWARM_DISCOVERY.

For more information and examples, see the Docker Swarm Discovery topic.

Options

The list command has the following options:

--timeout — Timeout period

Use --timeout "<interval>s" to specify the timeout period, in seconds, to wait for the discovery backend to return the list. The default interval is 10s.

--discovery-opt — Discovery options

Use --discovery-opt <value> to discovery options, such as paths to the TLS files; the CA’s public key certificate, the certificate, and the private key of the distributed K/V store on a Consul or etcd discovery backend. You can enter multiple discovery options. For example:

--discovery-opt kv.cacertfile=/path/to/mycacert.pem \
--discovery-opt kv.certfile=/path/to/mycert.pem \
--discovery-opt kv.keyfile=/path/to/mykey.pem \

For more information, see Use TLS with distributed key/value discovery

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