Multi-node MicroK8s
Adding a node
To create a cluster out of two or more already-running MicroK8s instances,
use the microk8s.add-node
command. The MicroK8s instance on which this
command is
run will be the master of the cluster and will host the Kubernetes
control plane:
microk8s.add-node
Join node with: microk8s.join ip-172-31-20-243:25000/DDOkUupkmaBezNnMheTBqFYHLWINGDbf
If the node you are adding is not reachable through the default
interface you can use one of the following:
microk8s.join 10.1.84.0:25000/DDOkUupkmaBezNnMheTBqFYHLWINGDbf
microk8s.join 10.22.254.77:25000/DDOkUupkmaBezNnMheTBqFYHLWINGDbf
The add-node
command prints a microk8s.join
command which should
be executed on the MicroK8s instance that you wish to join to the
cluster:
microk8s.join ip-172-31-20-243:25000/DDOkUupkmaBezNnMheTBqFYHLWINGDbf
Joining a node to the cluster should only take a few seconds. Afterwards you should be able to see the node has joined:
microk8s.kubectl get no
NAME STATUS ROLES AGE VERSION
10.22.254.79 Ready <none> 27s v1.15.3
ip-172-31-20-243 Ready <none> 53s v1.15.3
Removing a node
To remove a node from the cluster, use microk8s.remove-node
:
microk8s.remove-node 10.22.254.79
Finally, on the removed node, run microk8s.leave
. MicroK8s will restart
its own control plane and resume operations as a full single node cluster:
microk8s.leave
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