三、安装k8s
k3s官网：https://k3s.io
文档：
github:https://github.com/k3s-io/k3s
3.1 安装基础环境
# 安装基础环境 1.安装yum源 curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo 2.修改hostname hostnamectl set-hostname master && bash 3.关闭防火墙、关闭selinux，关闭iptables systemctl stop firewalld ; systemctl disable firewalld sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config service iptables stop && systemctl disable iptables iptables -F 4.关闭swap swapoff -a 临时关闭 注销/etc/fstab中swap 5.修改机器内核参数 modprobe br_netfilter echo "modprobe br_netfilter" >> /etc/profile cat > /etc/sysctl.d/k8s.conf <<EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1 EOF 6.配置hosts cat /etc/hosts 192.168.10.50 master 192.168.10.51 node1 7.时间同步设置定时同步任务 yum install ntpdate -y ntpdate time1.aliyun.com * */1 * * * /usr/sbin/ntpdate time1.aliyun.com systemctl restart crond 8.开启ipvs支持 #!/bin/bash ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack" for kernel_module in ${ipvs_modules}; do /sbin/modinfo -F filename ${kernel_module} > /dev/null 2>&1 if [ 0 -eq 0 ]; then /sbin/modprobe ${kernel_module} fi done chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ip_vs
9.安装containerd
yum install -y containerd
systemctl start containerd && systemctl status containerd && systemctl enable containerd
| 名称 | IP | 配置 | 用途 |
| master | 192.168.10.50 | 2核2G | K3s Server |
| node1 | 192.168.10.51 | 2核2G | K3s agent |
本来是2核1G，结果卡死了，只能将内存升级到2G
3.1 安装k3s server节点
国内用户安装执行以下命令：
# 安装最新的
curl -sfL https://rancher-mirror.oss-cn-beijing.aliyuncs.com/k3s/k3s-install.sh | INSTALL_K3S_MIRROR=cn sh -
k3s启动成功
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
[INFO] Creating /usr/local/bin/crictl symlink to k3s
[INFO] Skipping /usr/local/bin/ctr symlink to k3s, command exists in PATH at /usr/bin/ctr
[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 from /etc/systemd/system/multi-user.target.wants/k3s.service to /etc/systemd/system/k3s.service.
[INFO] systemd: Starting k3s
INSTALL_K3S_VERSION=v1.20.7+k3s1 && INSTALL_K3S_MIRROR=cn && sh k3s-install.sh
指定版本安装，没试过可能有问题
https://docs.rancher.cn/docs/k3s/installation/install-options/_index/#使用脚本安装的选项
# 验证安装是否成功
[root@master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 18m v1.24.4+k3s1
[root@master ~]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
local-path-provisioner-7b7dc8d6f5-k6wng 1/1 Running 0 18m
coredns-b96499967-t6q94 1/1 Running 1 (13m ago) 18m
helm-install-traefik-crd-98l64 0/1 Completed 1 18m
helm-install-traefik-h25tq 0/1 Completed 2 18m
metrics-server-668d979685-965rv 1/1 Running 2 (105s ago) 18m
svclb-traefik-b4e8c1f8-xjvtz 2/2 Running 0 98s
traefik-7cd4fcff68-nvchn 1/1 Running 0 98s
[root@master ~]# kubectl top nodes
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
master 192m 9% 893Mi 91%
[root@master ~]# systemctl status k3s
● k3s.service - Lightweight Kubernetes
Loaded: loaded (/etc/systemd/system/k3s.service; enabled; vendor preset: disabled)
Active: active (running) since 一 2022-09-05 19:00:02 CST; 19min ago
部署完成之后，上面所有的进程都由 k3s 这个 service 来创建管理。可以使用 systemctl status k3s 查看。
3.2 k3s集群添加work工作节点
# 1.提取 join token [root@master ~]# cat /var/lib/rancher/k3s/server/node-token K10a705b6f8de0f13587a6277a19ee3068749d5dc0cfb509e650046473f7af0c5f8::server:bd48ecd96b13ca6c4b7cd969545e1264 # 2.work节点执行 [root@node1 ~]# curl -sfL https://rancher-mirror.oss-cn-beijing.aliyuncs.com/k3s/k3s-install.sh | INSTALL_K3S_MIRROR=cn K3S_URL=https://192.168.10.51:6443 K3S_TOKEN=K10a705b6f8de0f13587a6277a19ee3068749d5dc0cfb509e650046473f7af0c5f8::server:bd48ecd96b13ca6c4b7cd969545e1264 sh - # 安装完成： [INFO] Creating /usr/local/bin/kubectl symlink to k3s [INFO] Creating /usr/local/bin/crictl symlink to k3s [INFO] Skipping /usr/local/bin/ctr symlink to k3s, command exists in PATH at /usr/bin/ctr [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/systemd/system/k3s-agent.service.env [INFO] systemd: Creating service file /etc/systemd/system/k3s-agent.service [INFO] systemd: Enabling k3s-agent unit Created symlink from /etc/systemd/system/multi-user.target.wants/k3s-agent.service to /etc/systemd/system/k3s-agent.service. [INFO] systemd: Starting k3s-agent
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready control-plane,master 72m v1.24.4+k3s1 node1 Ready <none> 64s v1.24.4+k3s1 [root@master ~]# kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE local-path-provisioner-7b7dc8d6f5-k6wng 1/1 Running 0 72m coredns-b96499967-t6q94 1/1 Running 1 (67m ago) 72m helm-install-traefik-crd-98l64 0/1 Completed 1 72m helm-install-traefik-h25tq 0/1 Completed 2 72m metrics-server-668d979685-965rv 1/1 Running 2 (56m ago) 72m svclb-traefik-b4e8c1f8-xjvtz 2/2 Running 0 55m traefik-7cd4fcff68-nvchn 1/1 Running 0 55m svclb-traefik-b4e8c1f8-gmft9 2/2 Running 0 72s
3.3 k3s卸载
[root@master ~]# ll /usr/local/bin/ 总用量 64816 lrwxrwxrwx 1 root root 3 9月 5 18:59 crictl -> k3s -rwxr-xr-x 1 root root 66363392 9月 5 18:59 k3s -rwxr-xr-x 1 root root 2024 9月 5 18:59 k3s-killall.sh -rwxr-xr-x 1 root root 1397 9月 5 18:59 k3s-uninstall.sh lrwxrwxrwx 1 root root 3 9月 5 18:59 kubectl -> k3s # 卸载命令 [root@master ~]# /usr/local/bin/k3s-uninstall.sh
四、k3s安装redis
# 导入镜像
ctr images import redis-master.tar.gz
ctr images import redis-slave.tar.gz
#
[root@master redis]# cat redis-master-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: redis-master
labels:
app: redis
spec:
selector:
matchLabels:
app: redis
role: master
tier: backend
replicas: 1
template:
metadata:
labels:
app: redis
role: master
tier: backend
spec:
containers:
- name: master
image: docker.io/kubeguide/redis-master:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 6379
[root@master redis]# cat redis-master-service.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-master
labels:
app: redis
role: master
tier: backend
spec:
ports:
- port: 6379
targetPort: 6379
selector:
app: redis
role: master
tier: backend
[root@master redis]# kubectl apply -f redis-master-deployment.yaml
deployment.apps/redis-master configured
[root@master redis]# kubectl apply -f redis-master-service.yaml
# slave
[root@master redis]# cat redis-slave-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: redis-slave
labels:
app: redis
spec:
selector:
matchLabels:
app: redis
role: slave
tier: backend
replicas: 1
template:
metadata:
labels:
app: redis
role: slave
tier: backend
spec:
containers:
- name: slave
image: docker.io/kubeguide/guestbook-redis-slave:latest
imagePullPolicy: IfNotPresent
env:
- name: GET_HOSTS_FROM
value: dns
ports:
- containerPort: 6379
[root@master redis]# cat redis-slave-service.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-slave
labels:
app: redis
role: slave
tier: backend
spec:
ports:
- port: 6379
selector:
app: redis
role: slave
tier: backen
[root@master redis]# kubectl get pods
NAME READY STATUS RESTARTS AGE
redis-master-7689cf48c9-wms77 1/1 Running 0 4m42s
redis-slave-76c777b89b-42n2v 1/1 Running 0 3m49s
