Install Mirantis Secure Registry

Install Mirantis Secure Registry

MSR system requirements

Mirantis Secure Registry can be installed on-premises or on the cloud. Before installing, be sure your infrastructure has these requirements.

Hardware and Software requirements

You can install MSR on-premises or on a cloud provider. To install MSR, all nodes must:

  • Be a worker node managed by MKE (Mirantis Kubernetes Engine)

  • Have a fixed hostname

Minimum requirements

  • 16GB of RAM for nodes running MSR

  • 2 vCPUs for nodes running MSR

  • 10GB of free disk space

Ports used

When installing MSR on a node, make sure the following ports are open on that node:






Web app and API client access to MSR.



Web app and API client access to MSR.

These ports are configurable when installing MSR.

MKE Configuration

When installing or backing up MSR on a MKE cluster, Administrators need to be able to deploy containers on MKE manager nodes or nodes running MSR”. This setting can be adjusted in the MKE Settings menu.

The MSR installation or backup will fail with the following error message if Administrators are unable to deploy on MKE manager nodes or nodes running MSR”.

Error response from daemon: {"message":"could not find any nodes on which the container could be created"}

Compatibility and maintenance lifecycle

Docker Enterprise Edition is a software subscription that includes three products:

  • Mirantis Container Runtime

  • Mirantis Secure Registry

  • Mirantis Kubernetes Engine

Step-by-step MSR installation

Mirantis Secure Registry (MSR) is a containerized application that runs on a swarm managed by the Mirantis Kubernetes Engine (MKE). It can be installed on-premises or on a cloud infrastructure.

Step 1. Validate the system requirements

Before installing MSR, make sure your infrastructure meets the MSR system requirements.

Step 2. Install MKE

MSR requires Mirantis Kubernetes Engine (MKE) to run.


Prior to installing MSR:

  • When upgrading, upgrade MKE before MSR for each major version. For example, if you are upgrading four major versions, upgrade one major version at a time, first MKE, then MSR, and then repeat for the remaining three versions. - MKE upgraded to the most recent version before an initial install of MSR.

  • Mirantis Container Runtime should be updated to the most recent version before installing or updating MKE.

MSR and MKE must not be installed on the same node, due to the potential for resource and port conflicts. Instead, install MSR on worker nodes that will be managed by MKE. Note also that MSR cannot be installed on a standalone Mirantis Container Runtime.

Step 3. Install MSR

  1. Once MKE is installed, navigate to the MKE web interface as an admin. Expand your profile on the left navigation pane, and select Admin Settings > Mirantis Secure Registry.

  2. After you configure all the options, you should see a Docker CLI command that you can use to install MSR. Before you run the command, take note of the --dtr-external-url parameter:

    $ docker run -it --rm \
      mirantis/dtr:2.8.2 install \
      --dtr-external-url <> \
      --ucp-node <mke-node-name> \
      --ucp-username admin \
      --ucp-url <mke-url>

    If you want to point this parameter to a load balancer that uses HTTP for health probes over port 80 or 443, temporarily reconfigure the load balancer to use TCP over a known open port. Once MSR is installed, you can configure the load balancer however you need to.

  3. Run the MSR install command on any node connected to the MKE cluster, and with Mirantis Container Runtime installed. MSR will not be installed on the node you run the install command on. MSR will be installed on the MKE worker defined by the --ucp-node flag.

    For example, you could SSH into a MKE node and run the MSR install command from there. Running the installation command in interactive TTY or -it mode means you will be prompted for any required additional information.

    Here are some useful options you can set during installation:

    • To install a specific version of MSR, replace 2.8.2 with your desired version in the installation command above.

    • MSR is deployed with self-signed certificates by default, so MKE might not be able to pull images from MSR. Use the --dtr-external-url <msr-domain>:<port> optional flag during installation, or during a reconfiguration, so that MKE is automatically reconfigured to trust MSR.

    • Starting with MSR 2.7, you can enable browser authentication via client certificates at install time. This bypasses the MSR login page and hides the logout button, thereby skipping the need for entering your username and password.

  4. Verify that MSR is installed. Either:

    • See https://<mke-fqdn>/manage/settings/dtr, or;

    • Navigate to Admin Settings > Mirantis Secure Registry from the MKE web UI. Under the hood, MKE modifies /etc/docker/certs.d for each host and adds MSR’s CA certificate. MKE can then pull images from MSR because the Mirantis Container Runtime for each node in the MKE swarm has been configured to trust MSR.

  5. Reconfigure your load balancer back to your desired protocol and port.

Step 4. Check that MSR is running

  1. In your browser, navigate to the MKE web interface.

  2. Select Shared Resources > Stacks from the left navigation pane. You should see MSR listed as a stack.

  3. To verify that MSR is accessible from the browser, enter your MSR IP address or FQDN on the address bar. Since HSTS (HTTP Strict-Transport-Security) header is included in all API responses, make sure to specify the FQDN (Fully Qualified Domain Name) of your MSR prefixed with https://, or your browser may refuse to load the web interface.

Step 5. Configure MSR

After installing MSR, you should configure:

  • The certificates used for TLS communication

  • The storage backend to store the Docker images

Web interface

  • To update your TLS certificates, access MSR from the browser and navigate to System > General.

  • To configure your storage backend, navigate to System > Storage. If you are upgrading and changing your existing storage backend, see Switch storage backends for the recommended steps.

Command line interface

To reconfigure MSR using the CLI, refer to reconfigure.

Step 6. Test pushing and pulling

Now that you have a working installation of MSR, you should test that you can push and pull images:

  • Configure your local Mirantis Container Runtime

  • Create a repository

  • Push and pull images

Step 7. Join replicas to the cluster

This step is optional.

To set up MSR for high availability, you can add more replicas to your MSR cluster. Adding more replicas allows you to load-balance requests across all replicas, and keep MSR working if a replica fails.

For high-availability, you should set 3 or 5 MSR replicas. The replica nodes also need to be managed by the same MKE.

To add replicas to a MSR cluster, use the join command.

  1. Load your MKE user bundle.

  2. Run the join command.

    docker run -it --rm \
      mirantis/dtr:2.8.2 join \
      --ucp-node <mke-node-name> \


    The <mke-node-name> following the --ucp-node flag is the target node to install the MSR replica. This is NOT the MKE Manager URL.

    When you join a replica to a MSR cluster, you need to specify the ID of a replica that is already part of the cluster. You can find an existing replica ID by going to the Shared Resources > Stacks page on MKE.

  3. Check that all replicas are running.

    In your browser, navigate to MKE’s web interface. Select Shared Resources > Stacks. All replicas should be displayed.

Installing MSR Offline

The procedure to install Mirantis Secure Registry on a host is the same, whether that host has access to the internet or not.

The only difference when installing on an offline host, is that instead of pulling the MKE images from Docker Hub, you use a computer that is connected to the internet to download a single package with all the images. Then you copy that package to the host where you’ll install MSR.

Download the offline package

Use a computer with internet access to download a package with all MSR images:

$ wget <package-url> -O dtr.tar.gz

Now that you have the package in your local machine, you can transfer it to the machines where you want to install MSR.

For each machine where you want to install MSR:

  1. Copy the MSR package to that machine.

    $ scp dtr.tar.gz <user>@<host>
  2. Use ssh to log into the hosts where you transferred the package.

  3. Load the MSR images.

    Once the package is transferred to the hosts, you can use the docker load command to load the Docker images from the tar archive:

    $ docker load -i dtr.tar.gz

Install MSR

Now that the offline hosts have all the images needed to install MSR, you can install MSR on that host.

Preventing outgoing connections

MSR makes outgoing connections to:

  • report analytics,

  • check for new versions,

  • check online licenses,

  • update the vulnerability scanning database

All of these uses of online connections are optional. You can choose to disable or not use any or all of these features on the admin settings page.

Upgrade MSR

MSR uses semantic versioning. While downgrades are not supported, Mirantis supports upgrades according to the following rules:

  • When upgrading from one patch version to another, you can skip patch versions because no data migration is performed for patch versions.

  • When upgrading between minor versions, you cannot skip versions, however you can upgrade from any patch version of the previous minor version to any patch version of the current minor version.

  • When upgrading between major versions, make sure to upgrade one major version at a time - and also to upgrade to the earliest available minor version. It is strongly recommended that you first upgrade to the latest minor/patch version for your major version.





patch upgrade




skip patch version




patch downgrade




minor upgrade




skip minor version




minor downgrade




skip major version




major downgrade




major upgrade




major upgrade skipping minor version




A few seconds of interruption may occur during the upgrade of a MSR cluster, so schedule the upgrade to take place outside of peak hours to avoid any business impacts.

Minor upgrade


Only perform the MSR upgrade once any correlating upgrades to Mirantis Container Runtime (MCR) and/or Mirantis Kubernetes Engine (MKE) have completed.

Mirantis recommends the following upgrade sequence:

  1. MCR

  2. MKE

  3. MSR

Before starting the MSR upgrade, confirm that:

  • The version of MKE in use is supported by the upgrade version of MSR.

  • The MSR and MKE backups are both recent.

  • A backup of current swarm state has been created.

    To create a swarm state backup, perform the following from a MKE manager node:

    ENGINE=$(docker version -f '{{.Server.Version}}')
    systemctl stop docker
    sudo tar czvf "/tmp/swarm-${ENGINE}-$(hostname -s)-$(date +%s%z).tgz" /var/lib/docker/swarm/
    systemctl start docker
  • (if possible) A backup exists of the images stored by MSR, if it is configured to store images on the local filesystem or within an NFS store.

    # If local filesystem
    sudo tar -cf ${BACKUP_LOCATION} -C /var/lib/docker/volumes/dtr-registry-${REPLICA_ID}
    # If NFS store
    sudo tar -cf ${BACKUP_LOCATION} -C /var/lib/docker/volumes/dtr-registry-nfs-${REPLICA_ID}
  • None of the MSR replica nodes are exhibiting time drift. To make this determination, review the kernel log timestamps for each of the nodes. If time drift is occurring, use clock synchronization (e.g., NTP) to keep node clocks in sync.

  • Local filesystems across MSR nodes are not exhibiting any disk storage issues.

  • Docker Content Trust in MKE is disabled.

  • All system requirements are met.

Step 1. Upgrade MSR to 2.8 if necessary

Confirm that you are running MSR 2.7. If this is not the case, upgrade your installation to the previous version.

Step 2. Upgrade MSR

Pull the latest version of MSR:

docker pull mirantis/dtr:2.8.2

Confirm that at least 16GB RAM is available on the node on which you are running the upgrade. If the MSR node does not have access to the internet, follow the offline installation documentation to get the images.

Once you have the latest image on your machine (and the images on the target nodes, if upgrading offline), run the upgrade command.


The upgrade command can be run from any available node, as MKE is aware of which worker nodes have replicas.

docker run -it --rm \
  mirantis/dtr:2.8.2 upgrade

By default, the upgrade command runs in interactive mode and prompts for any necessary information. If you are performing the upgrade on an existing replica, pass the --existing-replica-id flag.

The upgrade command will start replacing every container in your MSR cluster, one replica at a time. It will also perform certain data migrations. If anything fails or the upgrade is interrupted for any reason, rerun the upgrade command (the upgrade will resume from the point of interruption).

Step 3. Verify Upgrade Success

To confirm that the newly upgraded MSR environment is ready:

  • Make sure that all running MSR containers reflect the newly upgraded MSR version:

    docker ps --filter name=dtr
  • Verify that the MSR web UI is accessible and operational.

  • Confirm push and pull functionality of Docker images to and from the registry

  • Ensure that the MSR metadata store is in good standing:

    REPLICA_ID=$(docker inspect -f '{{.Name}}' $(docker ps -q -f name=dtr-rethink) | cut -f 3 -d '-')
    docker run -it --rm --net dtr-ol \
       -v dtr-ca-$REPLICA_ID:/ca \
       dockerhubenterprise/rethinkcli:v2.3.0 $REPLICA_ID
    # List problems in the cluster detected by the current node.
    > r.db("rethinkdb").table("current_issues")

Metadata Store Migration

When upgrading from 2.5 to 2.6, the system will run a metadatastoremigration job following a successful upgrade. This involves migrating the blob links for your images, which is necessary for online garbage collection. With 2.6, you can log into the MSR web interface and navigate to System > Job Logs to check the status of the metadatastoremigration job.

Garbage collection is disabled while the migration is running. In the case of a failed metadatastoremigration, the system will retry twice.

If the three attempts fail, it will be necessary to manually retrigger the metadatastoremigration job. To do this, send a POST request to the /api/v0/jobs endpoint:

curl https://<msr-external-url>/api/v0/jobs -X POST \
-u username:accesstoken -H 'Content-Type':'application/json' -d \
'{"action": "metadatastoremigration"}'

Alternatively, select API from the bottom left navigation pane of the MSR web interface and use the Swagger UI to send your API request.

Patch upgrade

A patch upgrade changes only the MSR containers and is always safer than a minor version upgrade. The command is the same as for a minor upgrade.

MSR cache upgrade

If you have previously deployed a cache, be sure to upgrade the node dedicated for your cache to keep it in sync with your upstream MSR replicas. This prevents authentication errors and other strange behaviors.

Download the vulnerability database

After upgrading MSR, it is necessary to redownload the vulnerability database.

Uninstalling MSR

Uninstalling MSR can be done by simply removing all data associated with each replica. To do that, you just run the destroy command once per replica:

docker run -it --rm \
  mirantis/dtr:2.8.2 destroy \

You will be prompted for the MKE URL, MKE credentials, and which replica to destroy.