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try k3s on raspberry

October 13, 2024 by walter

What is k3s

K3s is a fully compliant Kubernetes distribution with the following enhancements:
K8S 的 mini 版本, 用来边缘计算

• Distributed as a single binary or minimal container image. -- 以一个迷你的二进制包或容器镜像包分发
• Lightweight datastore based on sqlite3 as the default storage backend. etcd3, MySQL, and Postgres are also available. -- 基于 sqlite 的轻量级数据存储
• Wrapped in simple launcher that handles a lot of the complexity of TLS and options.
• Secure by default with reasonable defaults for lightweight environments.
• Operation of all Kubernetes control plane components is encapsulated in a single binary and process, allowing K3s to automate and manage complex cluster operations like distributing certificates. -- 将 k8s 控制平台的多个组件封装到一个二进制包中, 一个进程中, k3s 可以自动化管理复杂的集群操作, 例如分发证书
• External dependencies have been minimized; the only requirements are a modern kernel and cgroup mounts. -- 外部依赖最小化, 唯一的需求是现代化的内核和 cgroup mounts
• Packages the required dependencies for easy "batteries-included" cluster creation:
  • containerd / cri-dockerd container runtime (CRI)
  • Flannel Container Network Interface (CNI)
  • CoreDNS Cluster DNS
  • Traefik Ingress controller
  • ServiceLB Load-Balancer controller
  • Kube-router Network Policy controller
  • Local-path-provisioner Persistent Volume controller
  • Spegel distributed container image registry mirror
  • Host utilities (iptables, socat, etc)

Quick start

curl -sfL https://get.k3s.io | sh -
[INFO]  Finding release for channel stable
curl: (52) Empty reply from server
[INFO]  Using v1.30.5+k3s1 as release
[INFO]  Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.30.5+k3s1/sha256sum-arm.txt
[INFO]  Skipping binary downloaded, installed k3s matches hash
[INFO]  Finding available k3s-selinux versions
sh: 416: [: k3s-selinux-1.6-1.el9.noarch.rpm: unexpected operator
[INFO]  Skipping /usr/local/bin/kubectl symlink to k3s, already exists
[INFO]  Skipping /usr/local/bin/crictl symlink to k3s, already exists
[INFO]  Skipping /usr/local/bin/ctr symlink to k3s, already exists
[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/systemd/system/k3s.service.env
[INFO]  systemd: Creating service file /etc/systemd/system/k3s.service
[INFO]  systemd: Enabling k3s unit
Created symlink /etc/systemd/system/multi-user.target.wants/k3s.service → /etc/systemd/system/k3s.service.
[INFO]  No change detected so skipping service start
 $ sudo k3s kubectl get node
NAME          STATUS   ROLES                  AGE   VERSION
raspberrypi   Ready    control-plane,master   91s   v1.30.5+k3s1
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