Last modified April 25, 2018

gsctl list keypairs

The gsctl list keypairs command lists information on key pairs for a cluster. This is useful to understand which key pairs have been issued when and, if details are given, for what purpose. It is also helpful for setting up role based access control (RBAC) rules in the cluster.

Note that key pair information can only by shown as long as the key pair has not expired.

Key pairs

Giant Swarm offers X.509 client certificates as a means to authenticate with the Kubernetes API of a cluster. As usual, a certificate comes in pairs with a private key, hence the name “key pair”.

gsctl allows you to issue a new key pair using the two commands gsctl create keypair and gsctl create kubeconfig. These commands request the creation of a new key pair in the cluster’s public key infrastructure (PKI) and download it to the client. The PKI stores metadata about the issued key pairs, but not the key pairs themselves.

Usage and Output

The command requires as an argument the ID of the cluster to list key pairs for.

$ gsctl list keypairs -c <cluster-id>

The resulting output is a table containing the following columns:

  • CREATED: Date and time of creation
  • EXPIRES: Date and time of expiry. The client certificate won’t be accepted after that.
  • ID: An identifier unique within the PKI
  • DESCRIPTION: A descriptive text assigned at key pair creation
  • CN: The certificate’s CN field that is part of the Subject field of the certificate
  • O: The optional O field that, if set, also becomes part of the Subject field of the certificate. This assigns the client presenting the certificate to one or more RBAC groups.

The CN and O fields both form the Subject field of the key pair. If the O field is empty, the subject has the form CN=<CN value>. If the O field is not empty, the subject will have the format O=<O value>, CN=<CN value>.

Output is truncated by default for a better overview. Truncation can be turned off by adding the --full flag to the command.

Example output:

CREATED                 EXPIRES                 ID          DESCRIPTION                                                         CN                        O
2018 Apr 09, 14:05 UTC  2018 May 09, 14:05 UTC  4f16e3ac4…  Added by user using 'gsctl create kubeconfig'…  system:masters
2018 Apr 10, 08:24 UTC  2018 May 10, 08:24 UTC  4ce4d5469…  Added by user using 'gsctl create kubeconfig'…