Add public IP to Microk8s

Edit the microk8s template file.

vim /var/snap/microk8s/current/certs/csr.conf.template

Add the new IP Address, make sure to use a higher number for the IP address.

IP.100 = 192.168.1.1

It should look like this.

...

[ alt_names ]
DNS.1 = kubernetes
DNS.2 = kubernetes.default
DNS.3 = kubernetes.default.svc
DNS.4 = kubernetes.default.svc.cluster
DNS.5 = kubernetes.default.svc.cluster.local
IP.1 = 127.0.0.1
IP.2 = 192.168.1.1
IP.100 = 192.168.1.1 # USE IP > 100
#MOREIPS

...

Refresh certificate

sudo microk8s refresh-certs -e ca.crt

Check new IP was added

sudo cat /var/snap/microk8s/current/certs/csr.conf

Reboot the PC, just to make sure everything is OK

sudo reboot -h now

You may need to re-join all nodes since we created a new certificate and they aren’t aware of this change.

ubuntu – microk8s, DEVOPS : Unable to connect to the server: x509: certificate is valid for <internal IPs>, not <external IP> – Stack Overflow: Add public IP to Microk8s