使用kubeadm部署kubernetes
k8s版本:1.15.0
前期准备
-
节点:
- master:172.50.13.103(2核2G)
- node-1:172.50.13.104(2核2G)
- node-2:172.50.13.105(2核2G)
-
关闭firewalld防火墙(都要关)
systemctl stop firewalld && systemctl disable firewalld
-
关闭swap分区(都关)
- 临时关闭:
swapoff -a
- 永久关闭:
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
- 临时关闭:
-
关闭selinux(都关)
setenforce 0
sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
-
设置hostname:(分别设置)
- 13.103:
hostnamectl set-hostname k8s-master
- 13.104:
hostnamectl set-hostname k8s-node1
- 13.105:
hostnamectl set-hostname k8s-node2
- 13.103:
-
修改hosts文件:(都设置)
172.50.13.103 k8s-master
172.50.13.104 k8s-node1
172.50.13.105 k8s-node2
- 调整系统内核参数(都要设置)
cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness = 0
EOF
- 执行
sysctl -p或者sysctl --system
使修改后的系统参数生效。如果提示cannot stat /proc/sys/net/bridge/bridge-nf-call-ip6tables: 没有那个文件或目录
,则执行modprobe br_netfilter
安装docker并修改默认配置(三节点都要配置)
安装
# 安装docker所需的工具
yum install -y gcc gcc-c++ yum-utils device-mapper-persistent-data lvm2
# 配置阿里云的docker源
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 更新yum缓存
yum makecache
# 指定安装这个版本的docker-ce
yum install -y docker-ce-18.09.9-3.el7
# 启动docker
systemctl enable docker && systemctl start docker
修改docker文件
# 先停止docker服务
systemctl stop docker
# 修改/etc/docker/daemon.json,内容应如下。注意修改tmp1234为实际阿里云加速地址
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-level": "warn",
"log-opts": {
"max-size": "100m",
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
],
"registry-mirrors": [
"https://tmp1234.mirror.aliyuncs.com"
],
"ip-forward": true,
"ip-masq": false,
"iptables": false,
"ipv6": false,
"live-restore": true,
"selinux-enabled": false,
"data-root": "/home/data/docker",
}
# 重新加载docker配置文件并启动
systemctl daemon-reload
systemctl start docker
添加k8s的yum源(三节点都要配置)
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
安装k8s组件(三节点都要配置)
yum install -y kubelet-1.15.0 kubeadm-1.15.0 kubectl-1.15.0
systemctl enable kubelet
配置master节点
kubeadm init \
--apiserver-advertise-address=172.50.13.103 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.15.0 \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=10.244.0.0/16
主要参数说明:
apiserver-advertise-address
:指定api server地址image-repository
:镜像仓库地址kubernetes-version
:k8s版本service-cidr
:service的IP地址段pod-network-cidr
:pod网络IP段
等待执行完成,根据输出结果进行操作:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
在另外两个node节点执行:(以实际主节点执行kubeadm init
的结果为准)
kubeadm join 172.50.13.103:6443 --token 12345 --discovery-token-ca-cert-hash 123456
在master节点安装网络插件:
wget https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml
修改kube-flannel.yml
:
# 第106行
image: lizhenliang/flannel:v0.11.0-amd64
# 第120行
image: lizhenliang/flannel:v0.11.0-amd64
应用网络插件:
kubectl apply -f kube-flannel.yml
查看集群状态
kubectl get nodes
status全部为ready才能进行后面的操作。
kubectl get pod -n kube-system
只有全部ready都为1/1则可以成功执行后续步骤,如果flannel需检查网络情况,重新进行如下操作:
kubectl delete -f kube-flannel.yml
-> 重新wget
,修改镜像地址,然后 kubectl apply -f kube-flannel.yml
测试k8s集群
# 创建一个pod。nginx需要提前docker pull
kubectl create deployment nginx --image=nginx
# 暴露端口
kubectl expose deployment nginx --port=80 --type=NodePort
# 查看状态
kubectl get pods,svc
# 以下为返回结果,其中30938为nginx端口。在浏览器访问172.50.13.103:30938
NAME READY STATUS RESTARTS AGE
pod/nginx-554b9c67f9-v7ztr 1/1 Running 0 5h21m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.1.0.1 <none> 443/TCP 5h43m
service/nginx NodePort 10.1.82.8 <none> 80:30938/TCP 5h20m
部署dashboard
wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
修改vim kubernetes-dashboard.yaml
109 spec:
110 containers:
111 - name: kubernetes-dashboard
112 image: lizhenliang/kubernetes-dashboard-amd64:v1.10.1 # 修改此行
......
157 spec:
158 type: NodePort # 增加此行
159 ports:
160 - port: 443
161 targetPort: 8443
162 nodePort: 30001 # 增加此行
163 selector:
164 k8s-app: kubernetes-dashboard
应用:kubectl apply -f kubernetes-dashboard.yaml
在浏览器上验证:https://172.50.13.103:30001(chrome如果打不开,换火狐)
创建service account并绑定默认cluster-admin管理员集群角色:
# step 1
kubectl create serviceaccount dashboard-admin -n kube-system
# step 2
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
# step 3
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
复制token到页面的令牌处。
健康状态检查
组件、插件健康状态检查
kubectl get cs
或者
kubectl get componentstatus
服务状态检查
systemctl status kubelet docker
检查pod状态
kubectl get pods -o wide -n kube-system
本文来自博客园,作者:花酒锄作田,转载请注明原文链接:https://www.cnblogs.com/XY-Heruo/p/14669097.html