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61 lines
2.3 KiB
Plaintext
61 lines
2.3 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * migrating_from_ocp_3_to_4/migrating-applications-3-4.adoc
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// * migrating_from_ocp_3_to_4/advanced-migration-options-3-4.adoc
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// * migration_toolkit_for_containers/migrating-applications-with-mtc
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// * migration_toolkit_for_containers/advanced-migration-options-mtc.adoc
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:_mod-docs-content-type: REFERENCE
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[id="migration-prerequisites_{context}"]
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= Migration prerequisites
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* You must be logged in as a user with `cluster-admin` privileges on all clusters.
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.Direct image migration
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* You must ensure that the secure {product-registry} of the source cluster is exposed.
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* You must create a route to the exposed registry.
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.Direct volume migration
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* If your clusters use proxies, you must configure an Stunnel TCP proxy.
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ifdef::migrating-applications-3-4,advanced-migration-options-3-4[]
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.Internal images
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* If your application uses internal images from the `openshift` namespace, you must ensure that the required versions of the images are present on the target cluster.
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+
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You can manually update an image stream tag in order to use a deprecated {product-title} 3 image on an {product-title} {product-version} cluster.
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endif::[]
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.Clusters
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* The source cluster must be upgraded to the latest {mtc-short} z-stream release.
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* The {mtc-short} version must be the same on all clusters.
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.Network
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* The clusters have unrestricted network access to each other and to the replication repository.
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* If you copy the persistent volumes with `move`, the clusters must have unrestricted network access to the remote volumes.
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ifdef::migrating-applications-3-4,advanced-migration-options-3-4[]
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* You must enable the following ports on an {product-title} 3 cluster:
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** `8443` (API server)
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** `443` (routes)
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** `53` (DNS)
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endif::[]
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* You must enable the following ports on an {product-title} 4 cluster:
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** `6443` (API server)
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** `443` (routes)
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** `53` (DNS)
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* You must enable port `443` on the replication repository if you are using TLS.
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.Persistent volumes (PVs)
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* The PVs must be valid.
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* The PVs must be bound to persistent volume claims.
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* If you use snapshots to copy the PVs, the following additional prerequisites apply:
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** The cloud provider must support snapshots.
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** The PVs must have the same cloud provider.
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** The PVs must be located in the same geographic region.
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** The PVs must have the same storage class.
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