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MicroK8s : Add Nodes2021/04/07

 
If you'd like to add more Nodes to your MicroK8s Cluster, Configure like follows.
[1] Confirm commands to join in Cluster on primary Node.
[root@dlp ~]#
microk8s add-node

From the node you wish to join to this cluster, run the following:
microk8s join 10.0.0.30:25000/e4d12ddd881447063bfb7aa157989737

If the node you are adding is not reachable through the default interface you can use one of the following:
 microk8s join 10.0.0.30:25000/e4d12ddd881447063bfb7aa157989737

# if Firewalld is running, allow ports

[root@dlp ~]#
firewall-cmd --add-port={25000/tcp,16443/tcp,12379/tcp,10250/tcp,10255/tcp,10257/tcp,10259/tcp} --permanent

[root@dlp ~]#
firewall-cmd --reload

[2]
[3] On a new Node, Install MicroK8s and join in Cluster.
[root@node01 ~]#
snap install microk8s --classic

microk8s (1.20/stable) v1.20.5 from Canonical✓ installed
[root@node01 ~]#
export OPENSSL_CONF=/var/lib/snapd/snap/microk8s/current/etc/ssl/openssl.cnf

# if Firewalld is running, allow ports

[root@node01 ~]#
firewall-cmd --add-port={25000/tcp,10250/tcp,10255/tcp} --permanent

[root@node01 ~]#
firewall-cmd --reload

# run the command confirmed in [1]

[root@node01 ~]#
microk8s join 10.0.0.30:25000/e4d12ddd881447063bfb7aa157989737

Contacting cluster at 10.0.0.30
Waiting for this node to finish joining the cluster
[4] On primary Node, Make sure a new Node has been added in Cluster.
[root@dlp ~]#
microk8s kubectl get nodes

NAME               STATUS   ROLES    AGE    VERSION
dlp.srv.world      Ready    <none>   116m   v1.20.5-34+40f5951bd9888a
node01.srv.world   Ready    <none>   11s    v1.20.5-34+40f5951bd9888a
[5] To remove a Node, Set like follows.
# leave from cluster on the target node first

[root@node01 ~]#
microk8s leave

Generating new cluster certificates. Waiting for node to start.
# on primary node, remove the target node

[root@dlp ~]#
microk8s remove-node node01.srv.world
[root@dlp ~]#
microk8s kubectl get nodes

NAME            STATUS   ROLES    AGE    VERSION
dlp.srv.world   Ready    <none>   121m   v1.20.5-34+40f5951bd9888a
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