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doc: update the upgrade documentation to reflect 3.4.0 changes
Mainly removed rbd-nbd mounter specified at the pre-upgrade considerations affecting the restarts. Also updated the 3.3 tags to 3.4 Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
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Prasanna Kumar Kalever
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@ -10,6 +10,7 @@
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- [Upgrading from v3.0 to v3.1](#upgrading-from-v30-to-v31)
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- [Upgrading from v3.1 to v3.2](#upgrading-from-v31-to-v32)
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- [Upgrading from v3.2 to v3.3](#upgrading-from-v32-to-v33)
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- [Upgrading from v3.3 to v3.4](#upgrading-from-v33-to-v34)
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- [Upgrading CephFS](#upgrading-cephfs)
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- [1. Upgrade CephFS Provisioner resources](#1-upgrade-cephfs-provisioner-resources)
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- [1.1 Update the CephFS Provisioner RBAC](#11-update-the-cephfs-provisioner-rbac)
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@ -25,8 +26,6 @@
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- [4. Upgrade RBD Nodeplugin resources](#4-upgrade-rbd-nodeplugin-resources)
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- [4.1 Update the RBD Nodeplugin RBAC](#41-update-the-rbd-nodeplugin-rbac)
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- [4.2 Update the RBD Nodeplugin daemonset](#42-update-the-rbd-nodeplugin-daemonset)
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- [4.3 Manual deletion of RBD Nodeplugin daemonset pods](#43-manual-deletion-of-rbd-nodeplugin-daemonset-pods)
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- [Handling node reboot hangs due to existing network mounts](#handling-node-reboot-hangs-due-to-existing-network-mounts)
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- [CSI Sidecar containers consideration](#csi-sidecar-containers-consideration)
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## Pre-upgrade considerations
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@ -35,13 +34,10 @@ In some scenarios there is an issue in the CSI driver that will cause
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application pods to be disconnected from their mounts when the CSI driver is
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restarted. Since the upgrade would cause the CSI driver to restart if it is
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updated, you need to be aware of whether this affects your applications. This
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issue will happen when using the Ceph fuse client or rbd-nbd:
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issue will happen when using the Ceph fuse client.
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CephFS: If you are provision volumes for CephFS and have a kernel less than
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version 4.17, The CSI driver will fall back to use the FUSE client.
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RBD: If you have set the mounter: rbd-nbd option in the RBD storage class, the
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NBD mounter will have this issue.
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If you provision volumes for CephFS and have a kernel less than version 4.17,
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the CSI driver will fall back to use the FUSE client.
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If you are affected by this issue, you will need to proceed carefully during
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the upgrade to restart your application pods. The recommended step is to modify
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@ -49,10 +45,10 @@ the update strategy of the CSI nodeplugin daemonsets to OnDelete so that you
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can control when the CSI driver pods are restarted on each node.
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To avoid this issue in future upgrades, we recommend that you do not use the
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fuse client or rbd-nbd as of now.
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fuse client as of now.
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This guide will walk you through the steps to upgrade the software in a cluster
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from v3.0 to v3.1
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from v3.3 to v3.4
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### Snapshot-controller and snapshot crd
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@ -99,6 +95,11 @@ to upgrade from cephcsi v3.1 to v3.2
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## Upgrading from v3.2 to v3.3
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Refer [upgrade-from-v3.2-v3.3](https://github.com/ceph/ceph-csi/blob/v3.3.1/docs/ceph-csi-upgrade.md)
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to upgrade from cephcsi v3.2 to v3.3
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## Upgrading from v3.3 to v3.4
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**Ceph-csi releases from devel are expressly unsupported.** It is strongly
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recommended that you use [official
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releases](https://github.com/ceph/ceph-csi/releases) of Ceph-csi. Unreleased
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@ -107,12 +108,15 @@ that will not be supported in the official releases. Builds from the devel
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branch can have functionality changed and even removed at any time without
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compatibility support and without prior notice.
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git checkout v3.3.0 tag
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**Also, we do not recommend any direct upgrades to 3.4 except from 3.3 to 3.4.**
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For example, upgrading from 3.2 to 3.4 is not recommended.
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git checkout v3.4.0 tag
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```bash
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git clone https://github.com/ceph/ceph-csi.git
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cd ./ceph-csi
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git checkout v3.3.0
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git checkout v3.4.0
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```
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**Note:** While upgrading please Ignore warning messages from kubectl output
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@ -179,7 +183,7 @@ clusterrolebinding.rbac.authorization.k8s.io/cephfs-csi-nodeplugin configured
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If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations)
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that you were affected by the CSI driver restart issue that disconnects the
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application pods from their mounts, continue with this section. Otherwise, you
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application pods from their mounts, continue with this section. Otherwise, you
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can skip to step 2.2
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```console
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@ -237,7 +241,7 @@ For each node:
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- The pod deletion causes the pods to be restarted and updated automatically
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on the node.
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we have successfully upgraded cephfs csi from v3.2 to v3.3
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we have successfully upgraded cephfs csi from v3.3 to v3.4
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### Upgrading RBD
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@ -295,37 +299,6 @@ clusterrole.rbac.authorization.k8s.io/rbd-csi-nodeplugin-rules configured
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clusterrolebinding.rbac.authorization.k8s.io/rbd-csi-nodeplugin configured
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```
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If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations)
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that you were affected by the CSI driver restart issue that disconnects the
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application pods from their mounts, continue with this section. Otherwise, you
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can skip to step 4.2
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```console
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vi deploy/rbd/kubernetes/csi-rbdplugin.yaml
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```
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```yaml
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kind: DaemonSet
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apiVersion: apps/v1
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metadata:
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name: csi-rbdplugin
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spec:
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selector:
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matchLabels:
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app: csi-rbdplugin
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updateStrategy:
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type: OnDelete
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template:
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metadata:
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labels:
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app: csi-rbdplugin
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spec:
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serviceAccountName: rbd-csi-nodeplugin
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```
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in the above template we have added `updateStrategy` and its `type` to the
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daemonset spec
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##### 4.2 Update the RBD Nodeplugin daemonset
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```bash
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@ -334,40 +307,7 @@ daemonset.apps/csi-rbdplugin configured
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service/csi-metrics-rbdplugin configured
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```
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##### 4.3 Manual deletion of RBD Nodeplugin daemonset pods
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If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations)
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that you were affected by the CSI driver restart issue that disconnects the
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application pods from their mounts, continue with this section.
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Otherwise, you can skip this section.
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As we have set the updateStrategy to OnDelete the CSI driver pods will not be
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updated until you delete them manually. This allows you to control when your
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application pods will be affected by the CSI driver restart.
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For each node:
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- Drain your application pods from the node
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- Delete the CSI driver pods on the node
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- The pods to delete will be named with a csi-rbdplugin prefix and have a
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random suffix on each node. However, no need to delete the provisioner pods
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csi-rbdplugin-provisioner-* .
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- The pod deletion causes the pods to be restarted and updated automatically
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on the node.
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we have successfully upgraded RBD csi from v3.2 to v3.3
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### Handling node reboot hangs due to existing network mounts
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With prior versions of ceph-csi a node reboot may hang the reboot process. This
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is due to existing cephfs or rbd network mounts not carrying the `_netdev`
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mount option. The missing mount option is fixed, and future mounts using
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ceph-csi would automatically carry the required flags needed for a clean
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reboot.
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It is suggested to upgrade to the latest ceph-csi release and drain application
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pods on all the nodes so that new mount option `_netdev` can be added to all
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the mountpoints.
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we have successfully upgraded RBD csi from v3.3 to v3.4
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### CSI Sidecar containers consideration
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