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Premigration checklist for OCP 4 clusters

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Avital Pinnick
2021-06-17 14:37:37 +03:00
committed by openshift-cherrypick-robot
parent b9fb4e5b03
commit 871ba28e89
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_topic_map.yml
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@@ -2017,6 +2017,8 @@ Topics:
File: installing-mtc-restricted
- Name: Upgrading MTC
File: upgrading-mtc
- Name: Premigration checklists
File: premigration-checklists
- Name: Migrating your applications
File: migrating-applications-with-mtc
- Name: Troubleshooting

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migration-toolkit-for-containers/premigration-checklists.adoc Normal file
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[id="premigration-checks"]
= Premigration checklists
include::modules/common-attributes.adoc[]
:context: premigration-checks
toc::[]
Before you migrate your application workloads with the {mtc-full} ({mtc-short}), review the following checklists.
[id="cluster-health-checklist_{context}"]
== Cluster health checklist
* [ ] The clusters meet the minimum hardware requirements for the specific platform and installation method, for example, on xref:../installing/installing_bare_metal/installing-bare-metal.adoc#minimum-resource-requirements_installing-bare-metal[bare metal].
* [ ] The {mtc-short} version is the same on all clusters.
* [ ] All xref:../migration-toolkit-for-containers/migrating-applications-with-mtc.adoc#migration-prerequisites_migrating-applications-with-mtc[{mtc-short} prerequisites] are met.
* [ ] All nodes have an active {product-title} subscription.
* [ ] You have xref:../support/troubleshooting/verifying-node-health.adoc#verifying-node-health[verified node health].
* [ ] The xref:../authentication/understanding-identity-provider.adoc#supported-identity-providers[identity provider] is working.
* [ ] The migration network has a minimum throughput of 10 Gbps.
* [ ] The clusters have sufficient resources for migration.
+
[NOTE]
====
Clusters require additional memory, CPUs, and storage in order to run a migration on top of normal workloads. Actual resource requirements depend on the number of Kubernetes resources being migrated in a single migration plan. You must test migrations in a non-production environment in order to estimate the resource requirements.
====
* [ ] The link:https://access.redhat.com/solutions/4885641[etcd disk performance] of the clusters has been checked with `fio`.
[id="source-cluster-checklist_{context}"]
== Source cluster checklist
* [ ] You have checked for persistent volumes (PVs) with abnormal configurations stuck in a *Terminating* state by running the following command:
+
[source,terminal]
----
$ oc get pv
----
* [ ] You have checked for pods whose status is other than *Running* or *Completed* by running the following command:
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[source,terminal]
----
$ oc get pods --all-namespaces | egrep -v 'Running | Completed'
----
* [ ] You have checked for pods with a high restart count by running the following command:
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[source,terminal]
----
$ oc get pods --all-namespaces --field-selector=status.phase=Running \
-o json | jq '.items[]|select(any( .status.containerStatuses[]; \
.restartCount > 3))|.metadata.name'
----
+
Even if the pods are in a *Running* state, a high restart count might indicate underlying problems.
* [ ] The cluster certificates are valid for the duration of the migration process.
* [ ] You have checked for pending certificate-signing requests by running the following command:
+
[source,terminal]
----
$ oc get csr -A | grep pending -i
----
* [ ] The registry uses a link:../scalability_and_performance/optimizing-storage.html#recommended-configurable-storage-technology_persistent-storage[recommended storage type].
* [ ] You can read and write images to the registry.
* [ ] The link:https://access.redhat.com/articles/3093761[etcd cluster] is healthy.
* [ ] The xref:../post_installation_configuration/node-tasks.adoc#create-a-kubeletconfig-crd-to-edit-kubelet-parameters_post-install-node-tasks[average API server response time] on the source cluster is less than 50 ms.
[id="target-cluster-checklist_{context}"]
== Target cluster
* [ ] The cluster has the correct network configuration and permissions to access external services, for example, databases, source code repositories, container image registries, and CI/CD tools.
* [ ] External applications and services that use services provided by the cluster have the correct network configuration and permissions to access the cluster.
* [ ] Internal container image dependencies are met.
* [ ] The target cluster and the replication repository have sufficient storage space.