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Merge pull request #34931 from apinnick/bz1964901-manual-rollback-uninstall-mtc
BZ1964901: Manually rolling back migration, uninstalling
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‎migrating_from_ocp_3_to_4/troubleshooting-3-4.adoc‎

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= Troubleshooting
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include::modules/common-attributes.adoc[]
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:context: troubleshooting-3-4
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:troubleshooting-3-4:
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toc::[]
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include::modules/migration-partial-failure-velero.adoc[leveloffset=+2]
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include::modules/migration-using-mtc-crs-for-troubleshooting.adoc[leveloffset=+2]
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[discrete]
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[id="additional-resources-for-debugging-tools_{context}"]
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[discrete]
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=== Additional resources for debugging tools
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* xref:../migrating_from_ocp_3_to_4/about-mtc-3-4.adoc#migration-mtc-workflow_about-mtc-3-4[{mtc-short} workflow]
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You can roll back a migration by using the {mtc-short} web console or the CLI.
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You can also xref:../migrating_from_ocp_3_to_4/troubleshooting-3-4.adoc#migration-rolling-back-migration-manually_troubleshooting-3-4[roll back a migration manually].
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include::modules/migration-rolling-back-migration-web-console.adoc[leveloffset=+2]
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include::modules/migration-rolling-back-migration-cli.adoc[leveloffset=+2]
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include::modules/migration-rolling-back-migration-manually.adoc[leveloffset=+2]
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include::modules/migration-uninstalling-mtc-clean-up.adoc[leveloffset=+1]
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[id="additional-resources-uninstalling_{context}"]
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[discrete]
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=== Additional resources for uninstalling {mtc-short}
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* xref:../operators/admin/olm-deleting-operators-from-cluster.adoc#olm-deleting-operators-from-a-cluster-using-web-console_olm-deleting-operators-from-cluster[Deleting Operators from a cluster using the web console]
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:troubleshooting-3-4!:

‎migration_toolkit_for_containers/troubleshooting-mtc.adoc‎

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= Troubleshooting
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include::modules/common-attributes.adoc[]
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:context: troubleshooting-mtc
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:troubleshooting-mtc:
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toc::[]
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include::modules/migration-partial-failure-velero.adoc[leveloffset=+2]
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include::modules/migration-using-mtc-crs-for-troubleshooting.adoc[leveloffset=+2]
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[discrete]
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[id="additional-resources-for-debugging-tools_{context}"]
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[discrete]
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=== Additional resources for debugging tools
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* xref:../migration_toolkit_for_containers/about-mtc.adoc#migration-mtc-workflow_about-mtc[{mtc-short} workflow]
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You can roll back a migration by using the {mtc-short} web console or the CLI.
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You can also xref:../migration_toolkit_for_containers/troubleshooting-mtc.adoc#migration-rolling-back-migration-manually_troubleshooting-mtc[roll back a migration manually].
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include::modules/migration-rolling-back-migration-web-console.adoc[leveloffset=+2]
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include::modules/migration-rolling-back-migration-cli.adoc[leveloffset=+2]
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include::modules/migration-rolling-back-migration-manually.adoc[leveloffset=+2]
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include::modules/migration-uninstalling-mtc-clean-up.adoc[leveloffset=+1]
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[id="additional-resources-uninstalling_{context}"]
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[discrete]
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=== Additional resources for uninstalling {mtc-short}
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* xref:../operators/admin/olm-deleting-operators-from-cluster.adoc#olm-deleting-operators-from-a-cluster-using-web-console_olm-deleting-operators-from-cluster[Deleting Operators from a cluster using the web console]
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:troubleshooting-mtc!:

‎modules/migration-rolling-back-migration-cli.adoc‎

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[NOTE]
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====
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If you roll back a failed direct volume migration, the following resources are preserved in the namespaces specified in the `MigPlan` custom resource (CR) to help you debug the failed migration:
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The following resources remain in the migrated namespaces for debugging after a failed direct volume migration (DVM):
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* Config maps (source and destination clusters)
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* `Secret` CRs (source and destination clusters)
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* `Rsync` CRs (source cluster)
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* `Service` CRs (destination cluster)
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* `Route` CRs (destination cluster)
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These resources must be deleted manually.
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These resources do not affect rollback. You can delete them manually.
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If you later run the same migration plan successfully, the resources from the failed migration are deleted automatically.
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====

‎modules/migration-rolling-back-migration-manually.adoc‎

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// Module included in the following assemblies:
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//
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// * migrating_from_ocp_3_to_4/troubleshooting-3-4.adoc
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// * migration_toolkit_for_containers/troubleshooting-mtc
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[id="migration-rolling-back-migration-manually_{context}"]
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= Rolling back a migration manually
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You can roll back a failed migration manually by deleting the `stage` pods and unquiescing the application.
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If you run the same migration plan successfully, the resources from the failed migration are deleted automatically.
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[NOTE]
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====
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The following resources remain in the migrated namespaces after a failed direct volume migration (DVM):
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* Config maps (source and destination clusters)
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* `Secret` CRs (source and destination clusters)
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* `Rsync` CRs (source cluster)
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These resources do not affect rollback. You can delete them manually.
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====
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.Procedure
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. Delete the `stage` pods on all clusters:
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[source,terminal]
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----
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$ oc delete $(oc get pods -l migration.openshift.io/is-stage-pod -n <namespace>) <1>
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----
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<1> Namespaces specified in the `MigPlan` CR.
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. Unquiesce the application on the source cluster by scaling the replicas to their premigration number:
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[source,terminal]
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----
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$ oc scale deployment <deployment> --replicas=<premigration_replicas>
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----
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The `migration.openshift.io/preQuiesceReplicas` annotation in the `Deployment` CR displays the premigration number of replicas:
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[source,yaml]
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----
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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annotations:
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deployment.kubernetes.io/revision: "1"
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migration.openshift.io/preQuiesceReplicas: "1"
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----
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. Verify that the application pods are running on the source cluster:
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[source,terminal]
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----
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$ oc get pod -n <namespace>
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----

‎modules/migration-rolling-back-migration-web-console.adoc‎

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[NOTE]
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====
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If you roll back a failed direct volume migration, the following resources are preserved in the namespaces specified in the migration plan to help you debug the failed migration:
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The following resources remain in the migrated namespaces for debugging after a failed direct volume migration (DVM):
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* Config maps (source and target clusters)
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* `Secret` CRs (source and target clusters)
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* Config maps (source and destination clusters)
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* `Secret` CRs (source and destination clusters)
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* `Rsync` CRs (source cluster)
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* `Service` CRs (target cluster)
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* `Route` CRs (target cluster)
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These resources must be deleted manually.
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These resources do not affect rollback. You can delete them manually.
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If you later run the same migration plan successfully, the resources from the failed migration are deleted automatically.
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====

‎modules/migration-uninstalling-mtc-clean-up.adoc‎

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// Module included in the following assemblies:
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//
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// * migrating_from_ocp_3_to_4/troubleshooting-3-4.adoc
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// * migration_toolkit_for_containers/troubleshooting-mtc
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[id="migration-uninstalling-mtc-clean-up_{context}"]
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= Uninstalling {mtc-short} and deleting resources
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You can uninstall the {mtc-full} ({mtc-short}) and delete its resources to clean up the cluster.
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[NOTE]
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====
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Deleting the `velero` CRDs removes Velero from the cluster.
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====
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.Prerequisites
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* You must be logged in as a user with `cluster-admin` privileges.
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.Procedure
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. Delete the `MigrationController` custom resource (CR) on all clusters:
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[source,terminal]
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----
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$ oc delete migrationcontroller <migration_controller>
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----
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. Uninstall the {mtc-short} Operator on {product-title} 4 by using the {product-title} web console.
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ifdef::troubleshooting-3-4[]
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. Uninstall the {mtc-short} Operator on {product-title} 3 by deleting the `operator` CR manifest:
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[source,terminal]
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----
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$ oc delete -f operator.yml
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----
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endif::[]
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. Delete cluster-scoped resources on all clusters by running the following commands:
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* `migration` custom resource definitions (CRDs):
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[source,terminal]
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----
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$ oc delete $(oc get crds -o name | grep 'migration.openshift.io')
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----
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* `velero` CRDs:
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[source,terminal]
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----
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$ oc delete $(oc get crds -o name | grep 'velero')
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----
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* `migration` cluster roles:
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[source,terminal]
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----
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$ oc delete $(oc get clusterroles -o name | grep 'migration.openshift.io')
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----
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* `migration-operator` cluster role:
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[source,terminal]
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----
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$ oc delete clusterrole migration-operator
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----
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* `velero` cluster roles:
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[source,terminal]
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----
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$ oc delete $(oc get clusterroles -o name | grep 'velero')
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----
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* `migration` cluster role bindings:
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[source,terminal]
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----
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$ oc delete $(oc get clusterrolebindings -o name | grep 'migration.openshift.io')
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----
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* `migration-operator` cluster role bindings:
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[source,terminal]
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----
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$ oc delete clusterrolebindings migration-operator
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----
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* `velero` cluster role bindings:
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[source,terminal]
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$ oc delete $(oc get clusterrolebindings -o name | grep 'velero')
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----

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