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https://github.com/ceph/ceph
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119 lines
3.1 KiB
ReStructuredText
119 lines
3.1 KiB
ReStructuredText
==============
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Upgrading Ceph
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==============
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Cephadm is capable of safely upgrading Ceph from one bugfix release to
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another. For example, you can upgrade from v15.2.0 (the first Octopus
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release) to the next point release v15.2.1.
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The automated upgrade process follows Ceph best practices. For example:
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* The upgrade order starts with managers, monitors, then other daemons.
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* Each daemon is restarted only after Ceph indicates that the cluster
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will remain available.
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Keep in mind that the Ceph cluster health status is likely to switch to
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`HEALTH_WARNING` during the upgrade.
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Starting the upgrade
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====================
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Before you start, you should verify that all hosts are currently online
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and your cluster is healthy.
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::
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# ceph -s
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To upgrade (or downgrade) to a specific release::
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# ceph orch upgrade start --ceph-version <version>
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For example, to upgrade to v15.2.1::
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# ceph orch upgrade start --ceph-version 15.2.1
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Monitoring the upgrade
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======================
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Determine whether an upgrade is in process and what version the cluster is
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upgrading to with::
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# ceph orch upgrade status
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While the upgrade is underway, you will see a progress bar in the ceph
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status output. For example::
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# ceph -s
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[...]
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progress:
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Upgrade to docker.io/ceph/ceph:v15.2.1 (00h 20m 12s)
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[=======.....................] (time remaining: 01h 43m 31s)
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You can also watch the cephadm log with::
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# ceph -W cephadm
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Canceling an upgrade
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====================
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You can stop the upgrade process at any time with::
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# ceph orch upgrade stop
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Potential problems
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==================
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There are a few health alerts that can arise during the upgrade process.
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UPGRADE_NO_STANDBY_MGR
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----------------------
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Ceph requires an active and standby manager daemon in order to proceed, but
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there is currently no standby.
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You can ensure that Cephadm is configured to run 2 (or more) managers with::
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# ceph orch apply mgr 2 # or more
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You can check the status of existing mgr daemons with::
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# ceph orch ps --daemon-type mgr
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If an existing mgr daemon has stopped, you can try restarting it with::
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# ceph orch daemon restart <name>
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UPGRADE_FAILED_PULL
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-------------------
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Ceph was unable to pull the container image for the target version.
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This can happen if you specify an version or container image that does
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not exist (e.g., 1.2.3), or if the container registry is not reachable from
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one or more hosts in the cluster.
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You can cancel the existing upgrade and specify a different target version with::
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# ceph orch upgrade stop
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# ceph orch upgrade start --ceph-version <version>
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Using customized container images
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=================================
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For most users, simplify specifying the Ceph version is sufficient.
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Cephadm will locate the specific Ceph container image to use by
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combining the ``container_image_base`` configuration option (default:
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``docker.io/ceph/ceph``) with a tag of ``vX.Y.Z``.
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You can also upgrade to an arbitrary container image. For example, to
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upgrade to a development build::
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# ceph orch upgrade start --image quay.io/ceph-ci/ceph:recent-git-branch-name
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For more information about available container images, see :ref:`containers`.
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