Configure your Mirantis Container Runtime

By default Mirantis Container Runtime uses TLS when pushing and pulling images to an image registry like Mirantis Secure Registry (MSR).

If MSR is using the default configurations or was configured to use self-signed certificates, you need to configure your Mirantis Container Runtime to trust MSR. Otherwise, when you try to log in, push to, or pull images from MSR, you’ll get an error:

docker login msr.example.org

x509: certificate signed by unknown authority

The first step to make your Mirantis Container Runtime trust the certificate authority used by MSR is to get the MSR CA certificate. Then you configure your operating system to trust that certificate.

Add CA certificate to configure your host

macOS

In your browser navigate to https://<msr-url>/ca to download the TLS certificate used by MSR. Then add that certificate to macOS Keychain.

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

Windows

In your browser navigate to https://<msr-url>/ca to download the TLS certificate used by MSR. Open Windows Explorer, right-click the file you’ve downloaded, and choose Install certificate.

Then, select the following options:

  • Store location: local machine

  • Check place all certificates in the following store

  • Click Browser, and select Trusted Root Certificate Authorities

  • Click Finish

Learn more about managing TLS certificates.

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

Ubuntu/ Debian

# Download the MSR CA certificate
sudo curl -k https://<msr-domain-name>/ca -o /usr/local/share/ca-certificates/<msr-domain-name>.crt
# Refresh the list of certificates to trust
sudo update-ca-certificates
# Restart the Docker daemon
sudo service docker restart

RHEL/ CentOS

# Download the MSR CA certificate
sudo curl -k https://<msr-domain-name>/ca -o /etc/pki/ca-trust/source/anchors/<msr-domain-name>.crt
# Refresh the list of certificates to trust
sudo update-ca-trust
# Restart the Docker daemon
sudo /bin/systemctl restart docker.service

Boot2Docker

  1. Log into the virtual machine with ssh:

    docker-machine ssh <machine-name>

  2. Create the bootsync.sh file, and make it executable:

    sudo touch /var/lib/boot2docker/bootsync.sh
sudo chmod 755 /var/lib/boot2docker/bootsync.sh

  3. Add the following content to the bootsync.sh file. You can use nano or vi for this.

    #!/bin/sh

cat /var/lib/boot2docker/server.pem >> /etc/ssl/certs/ca-certificates.crt

  4. Add the MSR CA certificate to the server.pem file:

    curl -k https://<msr-domain-name>/ca | sudo tee -a /var/lib/boot2docker/server.pem

  5. Run bootsync.sh and restart the Docker daemon:

    sudo /var/lib/boot2docker/bootsync.sh
sudo /etc/init.d/docker restart

Log into MSR

To validate that your Docker daemon trusts MSR, try authenticating against MSR.

docker login msr.example.org

Where to go next