# Ceph-csi Upgrade - [Ceph-csi Upgrade](#ceph-csi-upgrade) - [Pre-upgrade considerations](#pre-upgrade-considerations) - [Upgrading from v1.2.x to v2.0.1](#upgrading-from-v12x-to-v201) - [Upgrading CephFS](#upgrading-cephfs) - [1. Upgrade CephFS Provisioner resources](#1-upgrade-cephfs-provisioner-resources) - [1.1 Update the CephFS Provisioner RBAC](#11-update-the-cephfs-provisioner-rbac) - [1.2 Update the CephFS Provisioner deployment](#12-update-the-cephfs-provisioner-deployment) - [2. Upgrade CephFS Nodeplugin resources](#2-upgrade-cephfs-nodeplugin-resources) - [2.1 Update the CephFS Nodeplugin RBAC](#21-update-the-cephfs-nodeplugin-rbac) - [2.2 Update the CephFS Nodeplugin daemonset](#22-update-the-cephfs-nodeplugin-daemonset) - [2.3 Manual deletion of CephFS Nodeplugin daemonset pods](#23-manual-deletion-of-cephfs-nodeplugin-daemonset-pods) - [Upgrading RBD](#upgrading-rbd) - [3. Upgrade RBD Provisioner resources](#3-upgrade-rbd-provisioner-resources) - [3.1 Update the RBD Provisioner RBAC](#31-update-the-rbd-provisioner-rbac) - [3.2 Update the RBD Provisioner deployment](#32-update-the-rbd-provisioner-deployment) - [4. Upgrade RBD Nodeplugin resources](#4-upgrade-rbd-nodeplugin-resources) - [4.1 Update the RBD Nodeplugin RBAC](#41-update-the-rbd-nodeplugin-rbac) - [4.2 Update the RBD Nodeplugin daemonset](#42-update-the-rbd-nodeplugin-daemonset) - [4.3 Manual deletion of RBD Nodeplugin daemonset pods](#43-manual-deletion-of-rbd-nodeplugin-daemonset-pods) - [Handling node reboot hangs due to existing network mounts](#handling-node-reboot-hangs-due-to-existing-network-mounts) ## Pre-upgrade considerations In some scenarios there is an issue in the CSI driver that will cause application pods to be disconnected from their mounts when the CSI driver is restarted. Since the upgrade would cause the CSI driver to restart if it is updated, you need to be aware of whether this affects your applications. This issue will happen when using the Ceph fuse client or rbd-nbd: CephFS: If you are provision volumes for CephFS and have a kernel less than version 4.17, The CSI driver will fall back to use the FUSE client. RBD: If you have set the mounter: rbd-nbd option in the RBD storage class, the NBD mounter will have this issue. If you are affected by this issue, you will need to proceed carefully during the upgrade to restart your application pods. The recommended step is to modify the update strategy of the CSI nodeplugin daemonsets to OnDelete so that you can control when the CSI driver pods are restarted on each node. To avoid this issue in future upgrades, we recommend that you do not use the fuse client or rbd-nbd as of now. This guide will walk you through the steps to upgrade the software in a cluster from v1.2.x to v2.0.1 ## Upgrading from v1.2.x to v2.0.1 **Ceph-csi releases from master are expressly unsupported.** It is strongly recommended that you use [official releases](https://github.com/ceph/ceph-csi/releases) of Ceph-csi. Unreleased versions from the master branch are subject to changes and incompatibilities that will not be supported in the official releases. Builds from the master branch can have functionality changed and even removed at any time without compatibility support and without prior notice. git checkout release v2.0.1 branch ```bash [$] git clone https://github.com/ceph/ceph-csi.git [$] git check v2.0.1 [$] cd ./ceph-csi ``` **Note:** While upgrading please Ignore warning messages from kubectl output ```console Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply ``` ### Upgrading CephFS Upgrading cephfs csi includes upgrade of cephfs driver and as well as kubernetes sidecar containers and also the permissions required for the kubernetes sidecar containers, lets upgrade the things one by one #### 1. Upgrade CephFS Provisioner resources Upgrade provisioner resources include updating the provisioner RBAC and Provisioner deployment ##### 1.1 Update the CephFS Provisioner RBAC ```bash [$] kubectl apply -f deploy/cephfs/kubernetes/csi-provisioner-rbac.yaml serviceaccount/cephfs-csi-provisioner configured clusterrole.rbac.authorization.k8s.io/cephfs-external-provisioner-runner configured clusterrole.rbac.authorization.k8s.io/cephfs-external-provisioner-runner-rules configured clusterrolebinding.rbac.authorization.k8s.io/cephfs-csi-provisioner-role configured role.rbac.authorization.k8s.io/cephfs-external-provisioner-cfg configured rolebinding.rbac.authorization.k8s.io/cephfs-csi-provisioner-role-cfg configured ``` ##### 1.2 Update the CephFS Provisioner deployment ```bash [$]kubectl apply -f deploy/cephfs/kubernetes/csi-cephfsplugin-provisioner.yaml service/csi-cephfsplugin-provisioner configured deployment.apps/csi-cephfsplugin-provisioner configured ``` wait for the deployment to complete ```bash [$]kubectl get deployment NAME READY UP-TO-DATE AVAILABLE AGE csi-cephfsplugin-provisioner 3/3 1 3 104m ``` deployment UP-TO-DATE value must be same as READY #### 2. Upgrade CephFS Nodeplugin resources Upgrading nodeplugin resources include updating the nodeplugin RBAC and nodeplugin daemonset ##### 2.1 Update the CephFS Nodeplugin RBAC ```bash [$]kubectl apply -f deploy/cephfs/kubernetes/csi-nodeplugin-rbac.yaml serviceaccount/cephfs-csi-nodeplugin configured clusterrole.rbac.authorization.k8s.io/cephfs-csi-nodeplugin configured clusterrole.rbac.authorization.k8s.io/cephfs-csi-nodeplugin-rules configured clusterrolebinding.rbac.authorization.k8s.io/cephfs-csi-nodeplugin configured ``` If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations) that you were affected by the CSI driver restart issue that disconnects the application pods from their mounts, continue with this section. Otherwise, you can skip to step 2.2 ```console vi deploy/cephfs/kubernetes/csi-cephfsplugin.yaml ``` ```yaml kind: DaemonSet apiVersion: apps/v1 metadata: name: csi-cephfsplugin spec: selector: matchLabels: app: csi-cephfsplugin updateStrategy: type: OnDelete template: metadata: labels: app: csi-cephfsplugin spec: serviceAccount: cephfs-csi-nodeplugin ``` in the above template we have added `updateStrategy` and its `type` to the daemonset spec ##### 2.2 Update the CephFS Nodeplugin daemonset ```bash [$]kubectl apply -f deploy/cephfs/kubernetes/csi-cephfsplugin.yaml daemonset.apps/csi-cephfsplugin configured service/csi-metrics-cephfsplugin configured ``` ##### 2.3 Manual deletion of CephFS Nodeplugin daemonset pods If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations) that you were affected by the CSI driver restart issue that disconnects the application pods from their mounts, continue with this section. Otherwise, you can skip this section. As we have set the updateStrategy to OnDelete the CSI driver pods will not be updated until you delete them manually. This allows you to control when your application pods will be affected by the CSI driver restart. For each node: - Drain your application pods from the node - Delete the CSI driver pods on the node - The pods to delete will be named with a csi-cephfsplugin prefix and have a random suffix on each node. However, no need to delete the provisioner pods: csi-cephfsplugin-provisioner-* . - The pod deletion causes the pods to be restarted and updated automatically on the node. we have successfully upgraded cephfs csi from v1.2.x to v2.0.1 ### Upgrading RBD Upgrading rbd csi includes upgrade of rbd driver and as well as kubernetes sidecar containers and also the permissions required for the kubernetes sidecar containers, lets upgrade the things one by one #### 3. Upgrade RBD Provisioner resources Upgrading provisioner resources include updating the provisioner RBAC and Provisioner deployment ##### 3.1 Update the RBD Provisioner RBAC ```bash [$]kubectl apply -f deploy/rbd/kubernetes/csi-provisioner-rbac.yaml serviceaccount/rbd-csi-provisioner configured clusterrole.rbac.authorization.k8s.io/rbd-external-provisioner-runner configured clusterrole.rbac.authorization.k8s.io/rbd-external-provisioner-runner-rules configured clusterrolebinding.rbac.authorization.k8s.io/rbd-csi-provisioner-role configured role.rbac.authorization.k8s.io/rbd-external-provisioner-cfg configured rolebinding.rbac.authorization.k8s.io/rbd-csi-provisioner-role-cfg configured ``` ##### 3.2 Update the RBD Provisioner deployment ```bash [$]kubectl apply -f deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml service/csi-rbdplugin-provisioner configured deployment.apps/csi-rbdplugin-provisioner configured ``` wait for the deployment to complete ```bash [$]kubectl get deployments NAME READY UP-TO-DATE AVAILABLE AGE csi-rbdplugin-provisioner 3/3 3 3 139m ``` deployment UP-TO-DATE value must be same as READY #### 4. Upgrade RBD Nodeplugin resources Upgrading nodeplugin resources include updating the nodeplugin RBAC and nodeplugin daemonset ##### 4.1 Update the RBD Nodeplugin RBAC ```bash [$]kubectl apply -f deploy/rbd/kubernetes/csi-nodeplugin-rbac.yaml serviceaccount/rbd-csi-nodeplugin configured clusterrole.rbac.authorization.k8s.io/rbd-csi-nodeplugin configured clusterrole.rbac.authorization.k8s.io/rbd-csi-nodeplugin-rules configured clusterrolebinding.rbac.authorization.k8s.io/rbd-csi-nodeplugin configured ``` If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations) that you were affected by the CSI driver restart issue that disconnects the application pods from their mounts, continue with this section. Otherwise, you can skip to step 4.2 ```console vi deploy/rbd/kubernetes/csi-rbdplugin.yaml ``` ```yaml kind: DaemonSet apiVersion: apps/v1 metadata: name: csi-rbdplugin spec: selector: matchLabels: app: csi-rbdplugin updateStrategy: type: OnDelete template: metadata: labels: app: csi-rbdplugin spec: serviceAccount: rbd-csi-nodeplugin ``` in the above template we have added `updateStrategy` and its `type` to the daemonset spec ##### 4.2 Update the RBD Nodeplugin daemonset ```bash [$]kubectl apply -f deploy/rbd/kubernetes/csi-rbdplugin.yaml daemonset.apps/csi-rbdplugin configured service/csi-metrics-rbdplugin configured ``` ##### 4.3 Manual deletion of RBD Nodeplugin daemonset pods If you determined in [Pre-upgrade considerations](#pre-upgrade-considerations) that you were affected by the CSI driver restart issue that disconnects the application pods from their mounts, continue with this section. Otherwise, you can skip this section. As we have set the updateStrategy to OnDelete the CSI driver pods will not be updated until you delete them manually. This allows you to control when your application pods will be affected by the CSI driver restart. For each node: - Drain your application pods from the node - Delete the CSI driver pods on the node - The pods to delete will be named with a csi-rbdplugin prefix and have a random suffix on each node. However, no need to delete the provisioner pods csi-rbdplugin-provisioner-* . - The pod deletion causes the pods to be restarted and updated automatically on the node. we have successfully upgraded RBD csi from v1.2.x to v2.0.1 ### Handling node reboot hangs due to existing network mounts With prior versions of ceph-csi a node reboot may hang the reboot process. This is due to existing cephfs or rbd network mounts not carrying the `_netdev` mount option. The missing mount option is fixed, and future mounts using ceph-csi would automatically carry the required flags needed for a clean reboot. It is suggested to upgrade to the latest ceph-csi release and drain application pods on all the nodes so that new mount option `_netdev` can be added to all the mountpoints.