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---
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title: "swarm ca"
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description: "The swarm ca command description and usage"
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keywords: "swarm, ca"
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---
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<!-- This file is maintained within the docker/docker Github
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will be rejected.
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-->
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# swarm ca
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```markdown
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Usage: docker swarm ca [OPTIONS]
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Manage root CA
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Options:
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--ca-cert pem-file Path to the PEM-formatted root CA certificate to use for the new cluster
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--ca-key pem-file Path to the PEM-formatted root CA key to use for the new cluster
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--cert-expiry duration Validity period for node certificates (ns|us|ms|s|m|h) (default 2160h0m0s)
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-d, --detach Exit immediately instead of waiting for the root rotation to converge
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--external-ca external-ca Specifications of one or more certificate signing endpoints
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--help Print usage
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-q, --quiet Suppress progress output
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--rotate Rotate the swarm CA - if no certificate or key are provided, new ones will be generated
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```
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## Description
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View or rotate the current swarm CA certificate. This command must target a manager node.
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## Examples
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Run the `docker swarm ca` command without any options to view the current root CA certificate
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in PEM format.
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```bash
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$ docker swarm ca
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-----BEGIN CERTIFICATE-----
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MIIBazCCARCgAwIBAgIUJPzo67QC7g8Ebg2ansjkZ8CbmaswCgYIKoZIzj0EAwIw
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EzERMA8GA1UEAxMIc3dhcm0tY2EwHhcNMTcwNTAzMTcxMDAwWhcNMzcwNDI4MTcx
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MDAwWjATMREwDwYDVQQDEwhzd2FybS1jYTBZMBMGByqGSM49AgEGCCqGSM49AwEH
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A0IABKL6/C0sihYEb935wVPRA8MqzPLn3jzou0OJRXHsCLcVExigrMdgmLCC+Va4
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+sJ+SLVO1eQbvLHH8uuDdF/QOU6jQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB
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Af8EBTADAQH/MB0GA1UdDgQWBBSfUy5bjUnBAx/B0GkOBKp91XvxzjAKBggqhkjO
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PQQDAgNJADBGAiEAnbvh0puOS5R/qvy1PMHY1iksYKh2acsGLtL/jAIvO4ACIQCi
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lIwQqLkJ48SQqCjG1DBTSBsHmMSRT+6mE2My+Z3GKA==
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-----END CERTIFICATE-----
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```
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Pass the `--rotate` flag (and optionally a `--ca-cert`, along with a `--ca-key` or
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`--external-ca` parameter flag), in order to rotate the current swarm root CA.
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```
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$ docker swarm ca --rotate
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desired root digest: sha256:05da740cf2577a25224c53019e2cce99bcc5ba09664ad6bb2a9425d9ebd1b53e
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rotated TLS certificates: [=========================> ] 1/2 nodes
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rotated CA certificates: [> ] 0/2 nodes
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```
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Once the rotation os finished (all the progress bars have completed) the now-current
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CA certificate will be printed:
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```
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$ docker swarm ca --rotate
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desired root digest: sha256:05da740cf2577a25224c53019e2cce99bcc5ba09664ad6bb2a9425d9ebd1b53e
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rotated TLS certificates: [==================================================>] 2/2 nodes
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rotated CA certificates: [==================================================>] 2/2 nodes
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-----BEGIN CERTIFICATE-----
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MIIBazCCARCgAwIBAgIUFynG04h5Rrl4lKyA4/E65tYKg8IwCgYIKoZIzj0EAwIw
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EzERMA8GA1UEAxMIc3dhcm0tY2EwHhcNMTcwNTE2MDAxMDAwWhcNMzcwNTExMDAx
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MDAwWjATMREwDwYDVQQDEwhzd2FybS1jYTBZMBMGByqGSM49AgEGCCqGSM49AwEH
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A0IABC2DuNrIETP7C7lfiEPk39tWaaU0I2RumUP4fX4+3m+87j0DU0CsemUaaOG6
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+PxHhGu2VXQ4c9pctPHgf7vWeVajQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB
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Af8EBTADAQH/MB0GA1UdDgQWBBSEL02z6mCI3SmMDmITMr12qCRY2jAKBggqhkjO
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PQQDAgNJADBGAiEA263Eb52+825EeNQZM0AME+aoH1319Zp9/J5ijILW+6ACIQCg
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gyg5u9Iliel99l7SuMhNeLkrU7fXs+Of1nTyyM73ig==
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-----END CERTIFICATE-----
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```
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### `--rotate`
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Root CA Rotation is recommended if one or more of the swarm managers have been
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compromised, so that those managers can no longer connect to or be trusted by
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any other node in the cluster.
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Alternately, root CA rotation can be used to give control of the swarm CA
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to an external CA, or to take control back from an external CA.
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The `--rotate` flag does not require any parameters to do a rotation, but you can
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optionally specify a certificate and key, or a certificate and external CA URL,
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and those will be used instead of an automatically-generated certificate/key pair.
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Because the root CA key should be kept secret, if provided it will not be visible
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when viewing swarm any information via the CLI or API.
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The root CA rotation will not be completed until all registered nodes have
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rotated their TLS certificates. If the rotation is not completing within a
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reasonable amount of time, try running
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`docker node ls --format {{.ID}} {{.Hostname}} {{.Status}} {{.TLSStatus}}` to
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see if any nodes are down or otherwise unable to rotate TLS certificates.
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### `--detach`
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Initiate the root CA rotation, but do not wait for the completion of or display the
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progress of the rotation.
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## Related commands
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* [swarm init](swarm_init.md)
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* [swarm join](swarm_join.md)
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* [swarm join-token](swarm_join_token.md)
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* [swarm leave](swarm_leave.md)
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* [swarm unlock](swarm_unlock.md)
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* [swarm unlock-key](swarm_unlock_key.md)
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Ying Li
Tibor Vass