DockerCLI/docs/reference/commandline/swarm_init.md

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---
title: "swarm init"
description: "The swarm init command description and usage"
keywords: "swarm, init"
---
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# swarm init
```markdown
Usage: docker swarm init [OPTIONS]
Initialize a swarm
Options:
--advertise-addr value Advertised address (format: <ip|interface>[:port])
--cert-expiry duration Validity period for node certificates (default 2160h0m0s)
--dispatcher-heartbeat duration Dispatcher heartbeat period (default 5s)
--external-ca value Specifications of one or more certificate signing endpoints
--force-new-cluster Force create a new cluster from current state
--help Print usage
--listen-addr value Listen address (format: <ip|interface>[:port])
--task-history-limit int Task history retention limit (default 5)
```
Initialize a swarm. The docker engine targeted by this command becomes a manager
in the newly created single-node swarm.
```bash
$ docker swarm init --advertise-addr 192.168.99.121
Swarm initialized: current node (bvz81updecsj6wjz393c09vti) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join \
--token SWMTKN-1-3pu6hszjas19xyp7ghgosyx9k8atbfcr8p2is99znpy26u2lkl-1awxwuwd3z9j1z3puu7rcgdbx \
172.17.0.2:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
```
`docker swarm init` generates two random tokens, a worker token and a manager token. When you join
a new node to the swarm, the node joins as a worker or manager node based upon the token you pass
to [swarm join](swarm_join.md).
After you create the swarm, you can display or rotate the token using
[swarm join-token](swarm_join_token.md).
### `--cert-expiry`
This flag sets the validity period for node certificates.
### `--dispatcher-heartbeat`
This flags sets the frequency with which nodes are told to use as a
period to report their health.
### `--external-ca value`
This flag sets up the swarm to use an external CA to issue node certificates. The value takes
the form `protocol=X,url=Y`. The value for `protocol` specifies what protocol should be used
to send signing requests to the external CA. Currently, the only supported value is `cfssl`.
The URL specifies the endpoint where signing requests should be submitted.
### `--force-new-cluster`
This flag forces an existing node that was part of a quorum that was lost to restart as a single node Manager without losing its data.
### `--listen-addr value`
The node listens for inbound swarm manager traffic on this address. The default is to listen on
0.0.0.0:2377. It is also possible to specify a network interface to listen on that interface's
address; for example `--listen-addr eth0:2377`.
Specifying a port is optional. If the value is a bare IP address or interface
name, the default port 2377 will be used.
### `--advertise-addr value`
This flag specifies the address that will be advertised to other members of the
swarm for API access and overlay networking. If unspecified, Docker will check
if the system has a single IP address, and use that IP address with with the
listening port (see `--listen-addr`). If the system has multiple IP addresses,
`--advertise-addr` must be specified so that the correct address is chosen for
inter-manager communication and overlay networking.
It is also possible to specify a network interface to advertise that interface's address;
for example `--advertise-addr eth0:2377`.
Specifying a port is optional. If the value is a bare IP address or interface
name, the default port 2377 will be used.
### `--task-history-limit`
This flag sets up task history retention limit.
## Related information
* [swarm join](swarm_join.md)
* [swarm leave](swarm_leave.md)
* [swarm update](swarm_update.md)
* [swarm join-token](swarm_join_token.md)
* [node rm](node_rm.md)