how to change a single node cluster into a multi-node one

[Weaverzhu]

Is your feature request related to a problem? Please describe.

joining a worker node to an existing cluster running creating token failed.

#1284 k0s seems to forbidden a single node cluster adding a worker.

Describe the solution you would like

No response

Describe alternatives you've considered

is there anyway besides creating a compeletely new cluster?

Additional context

No response

[wbo-yak]

Hi,
Any update on this ? is there an easy way to migrate from a single node to multi node ?

[wbo-yak]

Hi,
I was able to get through by updating the systemd service file.

• Remove "single=true" flag
• Allow controller to be a worker as well with "--enable-worker"
• Disable taints on the controller node
• Stop, Reload and Restart

systemctl stop k0scontroller 
systemctl daemon-reload
systemctl start k0scontroller

Original file :

[Unit]
Description=k0s - Zero Friction Kubernetes
Documentation=https://docs.k0sproject.io
ConditionFileIsExecutable=/usr/local/bin/k0s

After=network-online.target
Wants=network-online.target

[Service]
StartLimitInterval=5
StartLimitBurst=10
ExecStart=/usr/local/bin/k0s controller --config=/etc/k0s/k0s.yaml --single=true

RestartSec=120
Delegate=yes
KillMode=process
LimitCORE=infinity
TasksMax=infinity
TimeoutStartSec=0
LimitNOFILE=999999
Restart=always

[Install]
WantedBy=multi-user.target

Updated file :

[Unit]
Description=k0s - Zero Friction Kubernetes
Documentation=https://docs.k0sproject.io
ConditionFileIsExecutable=/usr/local/bin/k0s

After=network-online.target
Wants=network-online.target

[Service]
StartLimitInterval=5
StartLimitBurst=10
ExecStart=/usr/local/bin/k0s controller --config=/etc/k0s/k0s.yaml --enable-worker --no-taints

RestartSec=120
Delegate=yes
KillMode=process
LimitCORE=infinity
TasksMax=infinity
TimeoutStartSec=0
LimitNOFILE=999999
Restart=always

[Install]
WantedBy=multi-user.target