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The self-signed certificates or custom Certification Authorities

Since version 0.7.0 the GitLab Runner have allows to configure certificates that are used to verify TLS peer when connecting GitLab server.

This allows to solve the x509: certificate signed by unknown authority problem when registering runner.

The GitLab Runner provides these options:

  1. Default: GitLab Runner reads system certificate store and verifies the GitLab server against the CA's stored in system.

  2. GitLab Runner reads the PEM (DER format is not supported) certificate from predefined file:

     - `/etc/gitlab-runner/certs/hostname.crt` on *nix systems when gitlab-runner is executed as root.
 - `~/.gitlab-runner/certs/hostname.crt` on *nix systems when gitlab-runner is executed as non-root,
 - `./certs/hostname.crt` on other systems.

 If address of your server is: `https://my.gitlab.server.com:8443/`.
 Create the certificate file at: `/etc/gitlab-runner/certs/my.gitlab.server.com.crt`.

  3. GitLab Runner exposes tls-ca-file option during registration and in config.toml which allows you to specify custom file with certificates. This file will be read everytime when runner tries to access the GitLab server.

Git cloning

The runner injects missing certificates to build CA chain to build containers. This allows the git clone and artifacts to work with servers that do not use publicly trusted certificates.

This approach is secure, but makes the runner a single point of trust.