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K3S HA etcd

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Additional Preparation for Alpine Linux Setup

$ sudo nano /etc/update-extlinux.conf

…

default_kernel_opts="... cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory"

…

$ sudo update-extlinux

/boot is device /dev/sda1

$ sudo reboot

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建立第一個 K3S Master

$ curl -sfL https://get.k3s.io | K3S_TOKEN="mysecret" K3S_KUBECONFIG_MODE="644" sh -s server --cluster-init --cluster-domain=sre

[INFO] Finding release for channel stable

[INFO] Using v1.21.2+k3s1 as release

[INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.21.2+k3s1/sha256sum-amd64.txt

[INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.21.2+k3s1/k3s

[INFO] Verifying binary download

[INFO] Installing k3s to /usr/local/bin/k3s

[INFO] Creating /usr/local/bin/kubectl symlink to k3s

[INFO] Creating /usr/local/bin/crictl symlink to k3s

[INFO] Creating /usr/local/bin/ctr symlink to k3s

[INFO] Creating killall script /usr/local/bin/k3s-killall.sh

[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh

[INFO] env: Creating environment file /etc/rancher/k3s/k3s.env

[INFO] openrc: Creating service file /etc/init.d/k3s

[INFO] openrc: Enabling k3s service for default runlevel

[INFO] openrc: Starting k3s

* Caching service dependencies ... [ ok ]

* Starting k3s ... [ ok ]

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建立其他 K3S Master

$ curl -sfL https://get.k3s.io | K3S_TOKEN="mysecret" K3S_URL="https://120.96.143.83:6443" K3S_KUBECONFIG_MODE="644" sh -s server --cluster-domain=sre

[INFO] Finding release for channel stable

[INFO] Using v1.21.2+k3s1 as release

[INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.21.2+k3s1/sha256sum-amd64.txt

[INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.21.2+k3s1/k3s

[INFO] Verifying binary download

[INFO] Installing k3s to /usr/local/bin/k3s

[INFO] Creating /usr/local/bin/kubectl symlink to k3s

[INFO] Creating /usr/local/bin/crictl symlink to k3s

[INFO] Creating /usr/local/bin/ctr symlink to k3s

[INFO] Creating killall script /usr/local/bin/k3s-killall.sh

[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh

[INFO] env: Creating environment file /etc/rancher/k3s/k3s.env

[INFO] openrc: Creating service file /etc/init.d/k3s

[INFO] openrc: Enabling k3s service for default runlevel

[INFO] openrc: Starting k3s

* Caching service dependencies ... [ ok ]

* Starting k3s ... [ ok ]

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建立 K3S worker

$ curl -sfL https://get.k3s.io | K3S_TOKEN="mysecret" K3S_URL="https://120.96.143.83:6443" K3S_KUBECONFIG_MODE="644" sh -s -

[INFO] Finding release for channel stable

[INFO] Using v1.21.2+k3s1 as release

[INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.21.2+k3s1/sha256sum-amd64.txt

[INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.21.2+k3s1/k3s

[INFO] Verifying binary download

[INFO] Installing k3s to /usr/local/bin/k3s

[INFO] Creating /usr/local/bin/kubectl symlink to k3s

[INFO] Creating /usr/local/bin/crictl symlink to k3s

[INFO] Creating /usr/local/bin/ctr symlink to k3s

[INFO] Creating killall script /usr/local/bin/k3s-killall.sh

[INFO] Creating uninstall script /usr/local/bin/k3s-agent-uninstall.sh

[INFO] env: Creating environment file /etc/rancher/k3s/k3s-agent.env

[INFO] openrc: Creating service file /etc/init.d/k3s-agent

[INFO] openrc: Enabling k3s-agent service for default runlevel

[INFO] openrc: Starting k3s-agent

* Caching service dependencies ... [ ok ]

* Starting k3s-agent ... [ ok ]

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設定 K3S Worker 標籤

於 master 執行

$ kubectl get node

$ sudo kubectl label node 120-96-143-95-k3w95 node-role.kubernetes.io/worker=120-96-143-95-k3w95

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於 K3S 建置測試 Pod

$ kubectl run t1 --restart=Never --image=alpine -- sleep 30

pod/t1 created

$ kubectl get pods --watch

NAME READY STATUS RESTARTS AGE

t1 0/1 ContainerCreating 0 8s

t1 1/1 Running 0 12s

t1 0/1 Completed 0 42s

$ kubectl delete pods t1

pod "t1" deleted