『Kubernetes』在Linux中快速安装K8S集群

博主环境Centos7.9K8S1.8.0

一、基本环境配置

1. 关闭selinux

setenforce 0

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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k8s无法启动)

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3. 修改网卡配置

$ vi /etc/sysctl.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
$ sysctl -p

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4. 关闭防火墙

 systemctl stop firewalld
 systemctl disable firewalld

5. 设置机器HostName

这里设置为maste其他节点需要自行定义如node1node2…

hostnamectl set-hostname master

6. 更新系统时间

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

二、kubectl、kubeadm、kubelet的安装

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=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
	http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

2. 安装kubeadmkubelet和kubectl

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

三、部署Master节点

1. 初始化Master节点

# 有注释版本执行COPY时请复制下面的无注释版修改IP
kubeadm init \
--apiserver-advertise-address=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=10.1.0.0/16 \
--pod-network-cidr=10.244.0.0/16  # 使用flannel网络必须设置成这个cidrKUB

kubeadm init \
--apiserver-advertise-address=192.168.8.103 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.0 \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=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在master执行
 // 1、在线安装
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

• 如果无法连接我这里已经下载好了直接把文件下载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@master ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
etcd-0               Healthy   {"health":"true"}   
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
[root@master ~]# kubectl get nodes
NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   53m   v1.18.0
[root@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

四、部署Node节点

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