Chapter 7. Installing the Migration Toolkit for Containers in a restricted network environment
You can install the Migration Toolkit for Containers (MTC) on OpenShift Container Platform 3 and 4 in a restricted network environment by performing the following procedures:
Create a mirrored Operator catalog.
This process creates a
mapping.txt
file, which contains the mapping between theregistry.redhat.io
image and your mirror registry image. Themapping.txt
file is required for installing the Operator on the source cluster.Install the Migration Toolkit for Containers Operator on the OpenShift Container Platform 4.6 target cluster by using Operator Lifecycle Manager.
By default, the MTC web console and the
Migration Controller
pod run on the target cluster. You can configure theMigration Controller
custom resource manifest to run the MTC web console and theMigration Controller
pod on a source cluster or on a remote cluster.- Install the legacy Migration Toolkit for Containers Operator on the OpenShift Container Platform 3 source cluster from the command line interface.
- Configure object storage to use as a replication repository.
To uninstall MTC, see Uninstalling MTC and deleting resources.
7.1. Compatibility guidelines
You must install the Migration Toolkit for Containers (MTC) Operator that is compatible with your OpenShift Container Platform version.
Definitions
- legacy platform
- OpenShift Container Platform 4.5 and earlier.
- modern platform
- OpenShift Container Platform 4.6 and later.
- legacy operator
- The MTC Operator designed for legacy platforms.
- modern operator
- The MTC Operator designed for modern platforms.
- control cluster
- The cluster that runs the MTC controller and GUI.
- remote cluster
- A source or destination cluster for a migration that runs Velero. The Control Cluster communicates with Remote clusters via the Velero API to drive migrations.
OpenShift Container Platform 4.5 or earlier | OpenShift Container Platform 4.6 or later | |
---|---|---|
Stable MTC version | MTC 1.7.z
Legacy 1.7 operator: Install manually with the Important This cluster cannot be the control cluster. | MTC 1.7.z
Install with OLM, release channel |
Edge cases exist in which network restrictions prevent modern clusters from connecting to other clusters involved in the migration. For example, when migrating from an OpenShift Container Platform 3.11 cluster on premises to a modern OpenShift Container Platform cluster in the cloud, where the modern cluster cannot connect to the OpenShift Container Platform 3.11 cluster.
With MTC 1.7, if one of the remote clusters is unable to communicate with the control cluster because of network restrictions, use the crane tunnel-api
command.
With the stable MTC release, although you should always designate the most modern cluster as the control cluster, in this specific case it is possible to designate the legacy cluster as the control cluster and push workloads to the remote cluster.
7.2. Installing the Migration Toolkit for Containers Operator on OpenShift Container Platform 4.6
You install the Migration Toolkit for Containers Operator on OpenShift Container Platform 4.6 by using the Operator Lifecycle Manager.
Prerequisites
-
You must be logged in as a user with
cluster-admin
privileges on all clusters. - You must create an Operator catalog from a mirror image in a local registry.
Procedure
-
In the OpenShift Container Platform web console, click Operators
OperatorHub. - Use the Filter by keyword field to find the Migration Toolkit for Containers Operator.
- Select the Migration Toolkit for Containers Operator and click Install.
Click Install.
On the Installed Operators page, the Migration Toolkit for Containers Operator appears in the openshift-migration project with the status Succeeded.
- Click Migration Toolkit for Containers Operator.
- Under Provided APIs, locate the Migration Controller tile, and click Create Instance.
- Click Create.
-
Click Workloads
Pods to verify that the MTC pods are running.
7.3. Installing the legacy Migration Toolkit for Containers Operator on OpenShift Container Platform 3
You can install the legacy Migration Toolkit for Containers Operator manually on OpenShift Container Platform 3.
Prerequisites
-
You must be logged in as a user with
cluster-admin
privileges on all clusters. -
You must have access to
registry.redhat.io
. -
You must have
podman
installed. - You must create an image stream secret and copy it to each node in the cluster.
-
You must have a Linux workstation with network access in order to download files from
registry.redhat.io
. - You must create a mirror image of the Operator catalog.
- You must install the Migration Toolkit for Containers Operator from the mirrored Operator catalog on OpenShift Container Platform 4.6.
Procedure
Log in to
registry.redhat.io
with your Red Hat Customer Portal credentials:$ sudo podman login registry.redhat.io
-
Download the
operator.yml
file by entering the following command:
$ sudo podman cp $(sudo podman create \ registry.redhat.io/rhmtc/openshift-migration-legacy-rhel8-operator:v1.7):/operator.yml ./
Download the
controller.yml
file by entering the following command:$ sudo podman cp $(sudo podman create \ registry.redhat.io/rhmtc/openshift-migration-legacy-rhel8-operator:v1.7):/controller.yml ./
Obtain the Operator image mapping by running the following command:
$ grep openshift-migration-legacy-rhel8-operator ./mapping.txt | grep rhmtc
The
mapping.txt
file was created when you mirrored the Operator catalog. The output shows the mapping between theregistry.redhat.io
image and your mirror registry image.Example output
registry.redhat.io/rhmtc/openshift-migration-legacy-rhel8-operator@sha256:468a6126f73b1ee12085ca53a312d1f96ef5a2ca03442bcb63724af5e2614e8a=<registry.apps.example.com>/rhmtc/openshift-migration-legacy-rhel8-operator
Update the
image
values for theansible
andoperator
containers and theREGISTRY
value in theoperator.yml
file:containers: - name: ansible image: <registry.apps.example.com>/rhmtc/openshift-migration-legacy-rhel8-operator@sha256:<468a6126f73b1ee12085ca53a312d1f96ef5a2ca03442bcb63724af5e2614e8a> 1 ... - name: operator image: <registry.apps.example.com>/rhmtc/openshift-migration-legacy-rhel8-operator@sha256:<468a6126f73b1ee12085ca53a312d1f96ef5a2ca03442bcb63724af5e2614e8a> 2 ... env: - name: REGISTRY value: <registry.apps.example.com> 3
- Log in to your source cluster.
Create the Migration Toolkit for Containers Operator object:
$ oc create -f operator.yml
Example output
namespace/openshift-migration created rolebinding.rbac.authorization.k8s.io/system:deployers created serviceaccount/migration-operator created customresourcedefinition.apiextensions.k8s.io/migrationcontrollers.migration.openshift.io created role.rbac.authorization.k8s.io/migration-operator created rolebinding.rbac.authorization.k8s.io/migration-operator created clusterrolebinding.rbac.authorization.k8s.io/migration-operator created deployment.apps/migration-operator created Error from server (AlreadyExists): error when creating "./operator.yml": rolebindings.rbac.authorization.k8s.io "system:image-builders" already exists 1 Error from server (AlreadyExists): error when creating "./operator.yml": rolebindings.rbac.authorization.k8s.io "system:image-pullers" already exists
- 1
- You can ignore
Error from server (AlreadyExists)
messages. They are caused by the Migration Toolkit for Containers Operator creating resources for earlier versions of OpenShift Container Platform 4 that are provided in later releases.
Create the
MigrationController
object:$ oc create -f controller.yml
Verify that the MTC pods are running:
$ oc get pods -n openshift-migration
7.4. Proxy configuration
For OpenShift Container Platform 4.1 and earlier versions, you must configure proxies in the MigrationController
custom resource (CR) manifest after you install the Migration Toolkit for Containers Operator because these versions do not support a cluster-wide proxy
object.
For OpenShift Container Platform 4.2 to 4.6, the Migration Toolkit for Containers (MTC) inherits the cluster-wide proxy settings. You can change the proxy parameters if you want to override the cluster-wide proxy settings.
7.4.1. Direct volume migration
Direct Volume Migration (DVM) was introduced in MTC 1.4.2. DVM supports only one proxy. The source cluster cannot access the route of the target cluster if the target cluster is also behind a proxy.
If you want to perform a DVM from a source cluster behind a proxy, you must configure a TCP proxy that works at the transport layer and forwards the SSL connections transparently without decrypting and re-encrypting them with their own SSL certificates. A Stunnel proxy is an example of such a proxy.
7.4.1.1. TCP proxy setup for DVM
You can set up a direct connection between the source and the target cluster through a TCP proxy and configure the stunnel_tcp_proxy
variable in the MigrationController
CR to use the proxy:
apiVersion: migration.openshift.io/v1alpha1 kind: MigrationController metadata: name: migration-controller namespace: openshift-migration spec: [...] stunnel_tcp_proxy: http://username:password@ip:port
Direct volume migration (DVM) supports only basic authentication for the proxy. Moreover, DVM works only from behind proxies that can tunnel a TCP connection transparently. HTTP/HTTPS proxies in man-in-the-middle mode do not work. The existing cluster-wide proxies might not support this behavior. As a result, the proxy settings for DVM are intentionally kept different from the usual proxy configuration in MTC.
7.4.1.2. Why use a TCP proxy instead of an HTTP/HTTPS proxy?
You can enable DVM by running Rsync between the source and the target cluster over an OpenShift route. Traffic is encrypted using Stunnel, a TCP proxy. The Stunnel running on the source cluster initiates a TLS connection with the target Stunnel and transfers data over an encrypted channel.
Cluster-wide HTTP/HTTPS proxies in OpenShift are usually configured in man-in-the-middle mode where they negotiate their own TLS session with the outside servers. However, this does not work with Stunnel. Stunnel requires that its TLS session be untouched by the proxy, essentially making the proxy a transparent tunnel which simply forwards the TCP connection as-is. Therefore, you must use a TCP proxy.
7.4.1.3. Known issue
Migration fails with error Upgrade request required
The migration Controller uses the SPDY protocol to execute commands within remote pods. If the remote cluster is behind a proxy or a firewall that does not support the SPDY protocol, the migration controller fails to execute remote commands. The migration fails with the error message Upgrade request required
. Workaround: Use a proxy that supports the SPDY protocol.
In addition to supporting the SPDY protocol, the proxy or firewall also must pass the Upgrade
HTTP header to the API server. The client uses this header to open a websocket connection with the API server. If the Upgrade
header is blocked by the proxy or firewall, the migration fails with the error message Upgrade request required
. Workaround: Ensure that the proxy forwards the Upgrade
header.
7.4.2. Tuning network policies for migrations
OpenShift supports restricting traffic to or from pods using NetworkPolicy or EgressFirewalls based on the network plugin used by the cluster. If any of the source namespaces involved in a migration use such mechanisms to restrict network traffic to pods, the restrictions might inadvertently stop traffic to Rsync pods during migration.
Rsync pods running on both the source and the target clusters must connect to each other over an OpenShift Route. Existing NetworkPolicy or EgressNetworkPolicy objects can be configured to automatically exempt Rsync pods from these traffic restrictions.
7.4.2.1. NetworkPolicy configuration
7.4.2.1.1. Egress traffic from Rsync pods
You can use the unique labels of Rsync pods to allow egress traffic to pass from them if the NetworkPolicy
configuration in the source or destination namespaces blocks this type of traffic. The following policy allows all egress traffic from Rsync pods in the namespace:
apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: allow-all-egress-from-rsync-pods spec: podSelector: matchLabels: owner: directvolumemigration app: directvolumemigration-rsync-transfer egress: - {} policyTypes: - Egress
7.4.2.1.2. Ingress traffic to Rsync pods
apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: allow-all-egress-from-rsync-pods spec: podSelector: matchLabels: owner: directvolumemigration app: directvolumemigration-rsync-transfer ingress: - {} policyTypes: - Ingress
7.4.2.2. EgressNetworkPolicy configuration
The EgressNetworkPolicy
object or Egress Firewalls are OpenShift constructs designed to block egress traffic leaving the cluster.
Unlike the NetworkPolicy
object, the Egress Firewall works at a project level because it applies to all pods in the namespace. Therefore, the unique labels of Rsync pods do not exempt only Rsync pods from the restrictions. However, you can add the CIDR ranges of the source or target cluster to the Allow rule of the policy so that a direct connection can be setup between two clusters.
Based on which cluster the Egress Firewall is present in, you can add the CIDR range of the other cluster to allow egress traffic between the two:
apiVersion: network.openshift.io/v1 kind: EgressNetworkPolicy metadata: name: test-egress-policy namespace: <namespace> spec: egress: - to: cidrSelector: <cidr_of_source_or_target_cluster> type: Deny
7.4.2.3. Configuring supplemental groups for Rsync pods
When your PVCs use a shared storage, you can configure the access to that storage by adding supplemental groups to Rsync pod definitions in order for the pods to allow access:
Variable | Type | Default | Description |
---|---|---|---|
| string | Not set | Comma-separated list of supplemental groups for source Rsync pods |
| string | Not set | Comma-separated list of supplemental groups for target Rsync pods |
Example usage
The MigrationController
CR can be updated to set values for these supplemental groups:
spec: src_supplemental_groups: "1000,2000" target_supplemental_groups: "2000,3000"
7.4.3. Configuring proxies
Prerequisites
-
You must be logged in as a user with
cluster-admin
privileges on all clusters.
Procedure
Get the
MigrationController
CR manifest:$ oc get migrationcontroller <migration_controller> -n openshift-migration
Update the proxy parameters:
apiVersion: migration.openshift.io/v1alpha1 kind: MigrationController metadata: name: <migration_controller> namespace: openshift-migration ... spec: stunnel_tcp_proxy: http://<username>:<password>@<ip>:<port> 1 noProxy: example.com 2
Preface a domain with
.
to match subdomains only. For example,.y.com
matchesx.y.com
, but noty.com
. Use*
to bypass proxy for all destinations. If you scale up workers that are not included in the network defined by thenetworking.machineNetwork[].cidr
field from the installation configuration, you must add them to this list to prevent connection issues.This field is ignored if neither the
httpProxy
nor thehttpsProxy
field is set.-
Save the manifest as
migration-controller.yaml
. Apply the updated manifest:
$ oc replace -f migration-controller.yaml -n openshift-migration
For more information, see Configuring the cluster-wide proxy.
7.5. Configuring a replication repository
The Multicloud Object Gateway is the only supported option for a restricted network environment.
MTC supports the file system and snapshot data copy methods for migrating data from the source cluster to the target cluster. You can select a method that is suited for your environment and is supported by your storage provider.
7.5.1. Prerequisites
- All clusters must have uninterrupted network access to the replication repository.
- If you use a proxy server with an internally hosted replication repository, you must ensure that the proxy allows access to the replication repository.
7.5.2. Configuring the Multicloud Object Gateway
You can configure the Multicloud Object Gateway (MCG) as a replication repository for the Migration Toolkit for Containers (MTC). MCG is a component of OpenShift Container Storage.
Procedure
- Deploy OpenShift Container Storage by using the appropriate OpenShift Container Storage deployment guide.
Obtain the S3 endpoint,
AWS_ACCESS_KEY_ID
, andAWS_SECRET_ACCESS_KEY
by running thedescribe
command on theNooBaa
custom resource.These values are required in order to add MCG as a replication repository to the MTC web console.
7.5.3. Additional resources
- Disconnected environment in the Red Hat OpenShift Container Storage documentation.
- MTC workflow
- About data copy methods
- Adding a replication repository to the MTC web console
7.6. Uninstalling MTC and deleting resources
You can uninstall the Migration Toolkit for Containers (MTC) and delete its resources to clean up the cluster.
Deleting the velero
CRDs removes Velero from the cluster.
Prerequisites
-
You must be logged in as a user with
cluster-admin
privileges.
Procedure
Delete the
MigrationController
custom resource (CR) on all clusters:$ oc delete migrationcontroller <migration_controller>
- Uninstall the Migration Toolkit for Containers Operator on OpenShift Container Platform 4 by using the Operator Lifecycle Manager.
Delete cluster-scoped resources on all clusters by running the following commands:
migration
custom resource definitions (CRDs):$ oc delete $(oc get crds -o name | grep 'migration.openshift.io')
velero
CRDs:$ oc delete $(oc get crds -o name | grep 'velero')
migration
cluster roles:$ oc delete $(oc get clusterroles -o name | grep 'migration.openshift.io')
migration-operator
cluster role:$ oc delete clusterrole migration-operator
velero
cluster roles:$ oc delete $(oc get clusterroles -o name | grep 'velero')
migration
cluster role bindings:$ oc delete $(oc get clusterrolebindings -o name | grep 'migration.openshift.io')
migration-operator
cluster role bindings:$ oc delete clusterrolebindings migration-operator
velero
cluster role bindings:$ oc delete $(oc get clusterrolebindings -o name | grep 'velero')