Docker Add Certificate

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  1. You may need to restart the docker service to get it to detect the change in OS certificates. Docker does have an additional location you can use to trust individual registry server CA.
  2. Storage customization Customize the storage location. By default, your registry data is persisted as a docker volume on the host filesystem. If you want to store your registry contents at a specific location on your host filesystem, such as if you have an SSD or SAN mounted into a particular directory, you might decide to use a bind mount instead.
  3. When you add a secret to the swarm (by running docker secret create), Docker sends the secret over to the swarm manager over a mutually authenticated TLS connection, making use of the built-in Certificate Authority that gets automatically created when bootstrapping a new swarm.

Estimated reading time: 4 minutes

This page contains information about hosting your own registry using theopen source Docker Registry. For information about Docker Hub, which offers ahosted registry with additional features such as teams, organizations, webhooks, automated builds, etc, see Docker Hub.

While it’s highly recommended to secure your registry using a TLS certificateissued by a known CA, you can choose to use self-signed certificates, or useyour registry over an unencrypted HTTP connection. Either of these choicesinvolves security trade-offs and additional configuration steps.

If you want to be able to run the docker CLI command as a non-root user, add your user to the docker user group, re-login, and restart docker.service. Warning: Anyone added to the docker group is root equivalent because they can use the docker run -privileged command to start containers with root privileges.

Docker add certificate meaning

Deploy a plain HTTP registry

Warning:It’s not possible to use an insecure registry with basic authentication.

This procedure configures Docker to entirely disregard security for yourregistry. This is very insecure and is not recommended. It exposes yourregistry to trivial man-in-the-middle (MITM) attacks. Only use this solution forisolated testing or in a tightly controlled, air-gapped environment.

  1. Edit the daemon.json file, whose default location is/etc/docker/daemon.json on Linux orC:ProgramDatadockerconfigdaemon.json on Windows Server. If you useDocker Desktop for Mac or Docker Desktop for Windows, click the Docker icon, choosePreferences (Mac) or Settings (Windows), and choose Docker Engine.

    If the daemon.json file does not exist, create it. Assuming there are noother settings in the file, it should have the following contents:

    Substitute the address of your insecure registry for the one in the example.

    With insecure registries enabled, Docker goes through the following steps:

    • First, try using HTTPS.
      • If HTTPS is available but the certificate is invalid, ignore the errorabout the certificate.
      • If HTTPS is not available, fall back to HTTP.

  2. Restart Docker for the changes to take effect.

Repeat these steps on every Engine host that wants to access your registry.

Use self-signed certificates

Docker Add Certificate To Truststore

Warning:Using this along with basic authentication requires to also trust the certificate into the OS cert store for some versions of docker (see below)

This is more secure than the insecure registry solution.

  1. Generate your own certificate:

    Be sure to use the name myregistrydomain.com as a CN.

  2. Use the result to start your registry with TLS enabled.

  3. Instruct every Docker daemon to trust that certificate. The way to do thisdepends on your OS.

    • Linux: Copy the domain.crt file to/etc/docker/certs.d/myregistrydomain.com:5000/ca.crt on every Dockerhost. You do not need to restart Docker.

    • Windows Server:

      1. Open Windows Explorer, right-click the domain.crtfile, and choose Install certificate. When prompted, select the followingoptions:

        Store locationlocal machine
        Place all certificates in the following storeselected

      2. Click Browser and select Trusted Root Certificate Authorities.

      3. Click Finish. Restart Docker.

    • Docker Desktop for Mac: Follow the instructions inAdding custom CA certificates.Restart Docker.

    • Docker Desktop for Windows: Follow the instructions inAdding custom CA certificates.Restart Docker.

Docker Add Certificate Windows

Troubleshoot insecure registry

This section lists some common failures and how to recover from them.

Failing...

Failing to configure the Engine daemon and trying to pull from a registry that is not usingTLS results in the following message:

Docker still complains about the certificate when using authentication?

When using authentication, some versions of Docker also require you to trust thecertificate at the OS level.

Docker Add Certificate To Windows Container

Ubuntu

Red Hat Enterprise Linux

Oracle Linux

Restart Docker for the changes to take effect.

Windows

Open Windows Explorer, right-click the certificate, and chooseInstall certificate.

Then, select the following options:

Add Certificate To Docker Container

  • Store location: local machine
  • Check place all certificates in the following store
  • Click Browser, and select Trusted Root Certificate Authorities
  • Click Finish

Docker Add Certificates

Learn more about managing TLS certificates.

After adding the CA certificate to Windows, restart Docker Desktop for Windows.

Docker Add Ssl Certificate

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