k3s-k3d-创新互联

k3s & k3d k3s

Lightweight Kubernetes

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官方站点：https://k3s.io

官方仓库：https://github.com/rancher/k3s

安装

将k3s安装成为服务：

curl -sfL https://get.k3s.io | sh -
# 添加worker节点
curl -sfL https://get.k3s.io | K3S_URL=https://k3s-server:6443 K3S_TOKEN=`ssh k3s-server  cat /var/lib/rancher/k3s/server/node-token` sh -

A kubeconfig file is written to/etc/rancher/k3s/k3s.yaml.

手动安装使用k3s：

Downloadk3sfrom latest release, x86_64, armhf, and arm64 are supported.
Run server.

sudo k3s server &
# Kubeconfig is written to /etc/rancher/k3s/k3s.yaml
sudo k3s kubectl get nodes

# On a different node run the below. NODE_TOKEN comes from
# /var/lib/rancher/k3s/server/node-token on your server
sudo k3s agent --server https://myserver:6443 --token ${NODE_TOKEN}

k3d 简介

k3d is a lightweight wrapper to run k3s (Rancher Lab’s minimal Kubernetes distribution) in docker.
k3d makes it very easy to create single- and multi-node k3s clusters in docker, e.g. for local development on Kubernetes.

官方站点: https://k3d.io

安装 linux系统下

# use the install script to grab the latest release:
wget: wget -q -O - https://raw.githubusercontent.com/rancher/k3d/main/install.sh | bash
# 或者
curl: curl -s https://raw.githubusercontent.com/rancher/k3d/main/install.sh | bash

Windows系统下

从官方仓库中下载对应的包, 配置好环境变量即可.

集群部署

单节点部署:

k3d cluster create mycluster

多节点部署:

k3d cluster create multiserver --servers 3
# 向已存在的集群中添加节点
k3d node create newserver --cluster multiserver --role server
# 部署两个agent节点
k3d cluster create --api-port 6550 -p "8081:80@loadbalancer" --agents 2

输出kubeconfig信息

k3d kubeconfig write k3s-default

暴露服务

1. via Ingress
In this example, we will deploy a simple nginx webserver deployment and make it accessible via ingress. Therefore, we have to create the cluster in a way, that the internal port 80 (where thetraefikingress controller is listening on) is exposed on the host system.
Create a cluster, mapping the ingress port 80 to localhost:8081
k3d cluster create --api-port 6550 -p "8081:80@loadbalancer" --agents 2
Good to know
--api-port 6550is not required for the example to work. It’s used to havek3s‘s API-Server listening on port 6550 with that port mapped to the host system.
the port-mapping construct8081:80@loadbalancermeans
map port8081from the host to port80on the container which matches the nodefilterloadbalancer
theloadbalancernodefilter matches only theserverlbthat’s deployed in front of a cluster’s server nodes
all ports exposed on theserverlbwill be proxied to the same ports on all server nodes in the cluster
Get the kubeconfig file
export KUBECONFIG="$(k3d kubeconfig write k3s-default)"
Create a nginx deployment
kubectl create deployment nginx --image=nginx
Create a ClusterIP service for it
kubectl create service clusterip nginx --tcp=80:80
Create an ingress object for it withkubectl apply -fNote:k3sdeploystraefikas the default ingress controller
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx
  annotations:
    ingress.kubernetes.io/ssl-redirect: "false"
spec:
  rules:
  - http:
      paths:
      - path: /
        backend:
          serviceName: nginx
          servicePort: 80
Curl it via localhost
curl localhost:8081/
2. via NodePort
Create a cluster, mapping the port 30080 from agent-0 to localhost:8082
k3d cluster create mycluster -p "8082:30080@agent[0]" --agents 2
Note: Kubernetes’ default NodePort range is30000-32767
Note: You may as well expose the whole NodePort range from the very beginning, e.g. viak3d cluster create mycluster --agents 3 -p "30000-32767:30000-32767@server[0]"(See this video from @portainer)
… (Steps 2 and 3 like above) …
Create a NodePort service for it withkubectl apply -f
apiVersion: v1
kind: Service
metadata:
  labels:
    app: nginx
  name: nginx
spec:
  ports:
  - name: 80-80
    nodePort: 30080
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  type: NodePort
Curl it via localhost
curl localhost:8082/

参考链接

k3d官方github仓库: https://github.com/rancher/k3d
k3d Documentation: https://k3d.io/

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