Kubernetes - MicroK8s - Ubuntu
- MicroK8s runs in a container ???
Install it from a snap:
sudo snap install microk8s --classic
Add user to the microk8s group:
sudo usermod -a -G microk8s user1
Check status and wait until it is ready:
microk8s status --wait-ready
Enable these components:
microk8s enable dashboard dns registry istio
microk8s disable dashboard dns registry istio
microk8s kubectl get all --all-namespaces
Setup aliases for the kubectl command:
alias mkctl="microk8s kubectl"
alias kubectl="microk8s kubectl"
Launch the dashboard-proxy:
microk8s dashboard-proxy
Start or stop MicroK8s:
microk8s start
microk8s stop
| https://192.168.3.214:16443/ | API server |
| https://192.168.3.214:10443 | dashboard |
HA
- multiple nodes
- control pane on multiple nodes
- data store needs to be HA ???
Do this on both nodes ( needs at least 1.19 ):
sudo snap install microk8s --classic --channel=1.19/stable # install
sudo snap refresh microk8s --classic --channel=1.19/stable # or update
On first host:
microk8s add-node
On second host (replace token):
microk8s join 10.128.63.86:25000/567a21bdfc9a64738ef4b3286b2b8a69
Setup a failure domain and restart:
echo "failure-domain=42" > /var/snap/microk8s/current/args/ha-conf
microk8s.stop
microk8s.start
Run on the node that is leaving:
microk8s leave
Run on another node:
microk8s remove-node host1
Force removal from another node in case we weren’t able to run leave ( due to crash, etc. ):
microk8s remove-node host1 --force
- NOTE - There are also cluster upgrade instructions. See the link in the references section.
Add a worker:
microk8s add-node
microk8s join 192.168.1.230:25000/92b2db237428470dc4fcfc4ebbd9dc81/2c0cb3284b05 --worker
Configure Services
$SNAP_DATA
/var/snap/microk8s/current
Edit this file:
vi /var/snap/microk8s/current/args/containerd
Restart the service:
sudo systemctl restart snap.microk8s.daemon-containerd.service
Stop and start MicroK8s:
microk8s stop
microk8s start