『Kubernetes』在Linux中快速安装K8S集群

&＃x1f4e3;读完这篇文章里你能收获到

• K8S安装全过程
• 博主自己实操笔记带你跳过所有坑
• 感谢点赞&＃43;收藏&＃xff0c;避免下次找不到~

博主环境&＃xff1a;Centos7.9&＃xff0c;K8S1.8.0

1. 关闭selinux

setenforce 0


2. 关闭swap分区或禁用swap文件

swapoff -a #临时关闭
free #可以通过这个命令查看swap是否关闭了
vi /etc/fstab #永久关闭 注释swap那一行(访问内存分区&＃xff0c;k8s无法启动)


3. 修改网卡配置

$ vi /etc/sysctl.conf
net.ipv4.ip_forward &＃61; 1
net.bridge.bridge-nf-call-iptables &＃61; 1
net.bridge.bridge-nf-call-ip6tables &＃61; 1
$ sysctl -p


4. 关闭防火墙

systemctl stop firewalld
systemctl disable firewalld


5. 设置机器HostName

这里设置为maste&＃xff0c;其他节点需要自行定义&＃xff0c;如node1&＃xff0c;node2…

hostnamectl set-hostname master


6. 更新系统时间

# 同步时间&＃xff08;这一步必须做&＃xff0c;否则后面安装flannel可能会有证书错误&＃xff09;
yum install ntpdate -y
ntpdate cn.pool.ntp.org


1. 添加Kubernetes的yum源

• 此处使用alibaba的镜像源

$ vi /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name&＃61;Kubernetes
baseurl&＃61;http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled&＃61;1
gpgcheck&＃61;0
repo_gpgcheck&＃61;0
gpgkey&＃61;http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg


2. 安装kubeadm&＃xff0c;kubelet和kubectl

yum makecache fast
yum install -y kubectl-1.18.0 kubeadm-1.18.0 kubelet-1.18.0 --nogpgcheck


1. 初始化Master节点

# 有注释版本&＃xff0c;执行COPY时请复制下面的无注释版&＃xff0c;修改IP
kubeadm init \
--apiserver-advertise-address&＃61;192.168.8.103 \ # 换成自己master的IP
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.0 \
--service-cidr&＃61;10.1.0.0/16 \
--pod-network-cidr&＃61;10.244.0.0/16 # 使用flannel网络必须设置成这个cidrKUB


kubeadm init \
--apiserver-advertise-address&＃61;192.168.8.103 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.0 \
--service-cidr&＃61;10.1.0.0/16 \
--pod-network-cidr&＃61;10.244.0.0/16


# 主节点需执行
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# 子节点需要加入的
kubeadm join 192.168.8.103:6443 --token hk8486.5em0jt93p7miilrh \
--discovery-token-ca-cert-hash sha256:8b9b83a8e3d8ac2e3e5d88404ab73e94d3ff00c0bc61f3e3af4492d8eb4db482


2. 安装Calico网络插件

kubectl apply -f https://docs.projectcalico.org/v3.10/manifests/calico.yaml


3. 安装Flannel

# 需要等到coredns都Run起来了再安装
# 安装flannel&＃xff08;在master执行&＃xff09;
// 1、在线安装
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml


• 如果无法连接&＃xff0c;我这里已经下载好了&＃xff0c;直接把文件下载&＃xff0c;传到系统里面执行即可
• 点击下载 kube-flannel.yml

// 2、离线安装
kubectl apply -f kube-flannel.yml


4. 设置开机自启动

systemctl enable kubelet.service
systemctl start kubelet.service


5. 查看节点初始化情况

[root&＃64;master ~]# kubectl get cs
NAME STATUS MESSAGE ERROR
etcd-0 Healthy {"health":"true"}
scheduler Healthy ok
controller-manager Healthy ok
[root&＃64;master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 53m v1.18.0
[root&＃64;master ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-57546b46d6-8jkbc 1/1 Running 0 15m
kube-system calico-node-nztgg 1/1 Running 0 15m
kube-system coredns-7ff77c879f-gq8f7 1/1 Running 0 54m
kube-system coredns-7ff77c879f-msb2g 1/1 Running 0 54m
kube-system etcd-master 1/1 Running 0 54m
kube-system kube-apiserver-master 1/1 Running 0 54m
kube-system kube-controller-manager-master 1/1 Running 0 54m
kube-system kube-proxy-hzthl 1/1 Running 0 54m
kube-system kube-scheduler-master 1/1 Running 0 54m


6. 如果出问题则重新初始化

kubeadm reset
rm -rf $HOME/.kube


1. 初始步骤

• 一、二全部执行一遍

2. 初始化Node节点

# 上面主节点返回的
kubeadm join 192.168.8.103:6443 --token hk8486.5em0jt93p7miilrh \
--discovery-token-ca-cert-hash sha256:8b9b83a8e3d8ac2e3e5d88404ab73e94d3ff00c0bc61f3e3af4492d8eb4db482


3. 设置开机自启动

systemctl enable kubelet.service
systemctl start kubelet.service