![]() Should one of the nodes crash we can move to any other node and continue working without much disruption.Īlmost all of the HA cluster management is transparent to the admin and requires minimal configuration. Since all nodes of the HA cluster run the master control plane the microk8s * commands are now available everywhere. The state of the current state of the HA cluster is shown with: microk8s status Voters: replicating the database, participating in leader election standby: replicating the database, not participating in leader election spare: not replicating the database, not participating in leader electionĬluster formation, database syncing, voter and leader elections are all transparent to the administrator. Finally, there are nodes that neither vote nor replicate the database. These nodes are on standby to take over the position of a departing voter. Apart from the voting nodes there are non-voting nodes silently keeping a copy of the database. Database maintenance involves a voting process through which a leader is elected. A subset of the cluster nodes (at least three) maintain a copy of the Kubernetes dqlite database. For example: echo "failure-domain=42" > /var/snap/microk8s/current/args/ha-confįrom MicroK8s version 1.19, this will now inform you of the HA status and the addresses and roles of additional nodes. A restart of MicroK8s in the updated nodes is required ( microk8s.stop microk8s.start). To make MicroK8s failure domain aware associate an integer to each failure domain and update the /var/snap/microk8s/current/args/ha-conf with it. Repeat this process (generate a token, run it from the joining node) for the third and any additional nodes. It may take a few minutes to successfully join. Copy this command and run it from the next node. On the initial node, run: microk8s add-node (see the install docs for Windows and macOS if you need to install MicroK8s.) Add at least two other nodesĪs before, install a 1.19+ version of MicroK8s on at least two additional machines (or LXD containers).įollow the usual procedure for clustering (described in the clustering documentation): Or update an existing installation with: sudo snap refresh microk8s -classic -channel=1.19/stableįor Windows and macOS, you can update your installation with: multipass exec microk8s - sudo snap refresh microk8s -classic -channel=1.19/stable ![]() On Linux, you can install any 1.19+ by specifying a channel: sudo snap install microk8s -classic -channel=1.19/stable For testing on a single machine, please see the documentation for installing on LXD This documentation describes the steps needed to form an HA cluster in MicroK8s and to check its state. The cluster state must be in a datastore that is itself highly available.The control plane must be running on more than one node so that losing a single node would not render the cluster inoperable.There must be more than one node available at any time.There are three components necessary for a highly available Kubernetes cluster: High availability is automatically enabled on MicroK8s for clusters with three or more nodes.Ī highly available Kubernetes cluster is a cluster that can withstand a failure on any one of its components and continue serving workloads without interruption. Manage upgrades with a Snap Store Proxy.
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