docker:tldr:4ee16

The "docker swarm ca" command is used to manage the root certificate authority (CA) for a Docker Swarm cluster.

In a Docker Swarm, the CA is responsible for generating and signing certificates that are used for securing the communication between the swarm nodes and services. These certificates are used to authenticate and encrypt the network traffic.

The "docker swarm ca" command provides various subcommands to manage the CA. Some of the commonly used subcommands are:

• "docker swarm ca rotate": This subcommand is used to rotate the CA certificate and key. It generates a new CA certificate and key, and reissues new certificates for all swarm nodes and services. This is usually done periodically to enhance security and prevent unauthorized access.

• "docker swarm ca inspect": This subcommand is used to retrieve information about the current CA configuration. It provides details about the expiration date of the current CA certificate, the trust bundle (the public part of the CA), and the current CA key.

• "docker swarm ca trusted-root": This subcommand is used to manage the trusted root certificates on the swarm nodes. With this command, you can add or remove trusted root certificates that should be used for validating the certificates issued by the CA.

Overall, the "docker swarm ca" command helps in managing the CA of a Docker Swarm, ensuring secure communication within the cluster.