k8s手动安装

一、主节点安装

设置主机名
hostnamectl set-hostname master
hostnamectl set-hostname node01

修改hosts文件
vim /etc/hosts
192.168.1.91 master
192.168.1.92 node01

关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

禁用SELINUX
setenforce 0
sed -i -re '/^s*SELINUX=/s/^/#/' -e '$i\SELINUX=disabled' /etc/selinux/config

关闭swap
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab

ipv6设置
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

安装docker
安装依赖
yum install yum-utils device-mapper-persistent-data lvm2 -y
下载repo文件
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
安装docker
yum update && yum install docker-ce-18.06.2.ce

设置docker
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
]
}
EOF

systemctl daemon-reload
systemctl restart docker

安装kubeadm, kubelet and kubectl（所有节点都要安装）
修改k8s源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubelet-1.16.3 kubectl-1.16.3 kubeadm-1.16.3 --disableexcludes=kubernetes
systemctl enable --now kubelet

注：使用yum安装程序时，如提示如下xxx.rpm公钥尚未安装，使用 yum install xxx.rpm --nogpgcheck 命令格式跳过公钥检查，如下：
yum install -y kubelet-1.16.3 kubectl-1.16.3 kubeadm-1.16.3 --disableexcludes=kubernetes --nogpgcheck

设置本地仓库拉取镜像
vi /usr/lib/systemd/system/docker.service
添加 --insecure-registry 172.16.40.78:1180
ExecStart=/usr/bin/dockerd --insecure-registry 172.16.40.78:1180
systemctl daemon-reload
systemctl restart docker
登录docker仓库
docker login 172.16.40.78:1180
输入用户名和密码
拉取镜像
docker pull 172.16.40.78:1180/k8s/kube-apiserver:v1.16.3
docker pull 172.16.40.78:1180/k8s/kube-controller-manager:v1.16.3
docker pull 172.16.40.78:1180/k8s/kube-scheduler:v1.16.3
docker pull 172.16.40.78:1180/k8s/kube-proxy:v1.16.3
docker pull 172.16.40.78:1180/k8s/pause:3.1
docker pull 172.16.40.78:1180/k8s/etcd:3.3.15-0
docker pull 172.16.40.78:1180/k8s/coredns:1.6.2
docker pull 172.16.40.78:1180/k8s/flannel:v0.11.0-amd64
镜像重命名标签
docker tag 172.16.40.78:1180/k8s/kube-apiserver:v1.16.3 k8s.gcr.io/kube-apiserver:v1.16.3
docker tag 172.16.40.78:1180/k8s/kube-controller-manager:v1.16.3 k8s.gcr.io/kube-controller-manager:v1.16.3
docker tag 172.16.40.78:1180/k8s/kube-scheduler:v1.16.3 k8s.gcr.io/kube-scheduler:v1.16.3
docker tag 172.16.40.78:1180/k8s/kube-proxy:v1.16.3 k8s.gcr.io/kube-proxy:v1.16.3
docker tag 172.16.40.78:1180/k8s/pause:3.1 k8s.gcr.io/pause:3.1
docker tag 172.16.40.78:1180/k8s/etcd:3.3.15-0 k8s.gcr.io/etcd:3.3.15-0
docker tag 172.16.40.78:1180/k8s/coredns:1.6.2 k8s.gcr.io/coredns:1.6.2
docker tag 172.16.40.78:1180/k8s/flannel:v0.11.0-amd64 quay.io/coreos/flannel:v0.11.0-amd64

初始化集群（只需要在Master上执行）
kubeadm init --pod-network-cidr=10.244.0.0/16

记录最后面的执行信息如下：后续在worker节点加入集群时，在worker节点执行该命令
kubeadm join 192.168.1.91:6443 --token mv96do.5j4o789pww3w9b8t
--discovery-token-ca-cert-hash sha256:15844ec4b9ce3a5659b07fd48b5d11f604d3b31539860584f63bdc933f016bd0

设置KUBECONFIG （所有节点都要配置）
注意：worker节点需要从主节点copy /etc/kubernetes/admin.conf文件
scp /etc/kubernetes/admin.conf root@node01:/etc/kubernetes/
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
export KUBECONFIG=$HOME/.kube/config

配置Pod网络插件flannel（只需要在Master上执行）
通过网站的flannel配置文件创建pod，如果失败，需要删除配置等网络恢复，重新创建。
创建命令
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml

注意：上述文件下载不动的话，参考这个地址https://www.cnblogs.com/runnerjack/p/12880583.html ，然后将内容保存成kube-flannel.yml文件即可。
删除命令
kubectl delete -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml

执行命令 “kubectl get pods -n kube-system”查看coredns pod的状态，直到STATUS变成Running
NAME READY STATUS RESTARTS AGE
coredns-5644d7b6d9-dx6qm 1/1 Running 0 31m
coredns-5644d7b6d9-w8th9 1/1 Running 0 31m
etcd-master 1/1 Running 0 30m
kube-apiserver-master 1/1 Running 0 30m
kube-controller-manager-master 1/1 Running 0 29m
kube-flannel-ds-amd64-bm9xl 1/1 Running 0 54s
kube-proxy-2k5nz 1/1 Running 0 31m
kube-scheduler-master 1/1 Running 0 30m

查看集群信息
# 查看节点信息
kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 35m v1.16.3

# 查看集群信息
kubectl cluster-info
Kubernetes master is running at https://192.168.1.91:6443
KubeDNS is running at https://192.168.1.91:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

# 查看所有的 Pod 命令
kubectl get pods --all-namespaces

Node节点加入集群（仅在worker节点执行）
kubeadm join 192.168.1.91:6443 --token mv96do.5j4o789pww3w9b8t --discovery-token-ca-cert-hash sha256:15844ec4b9ce3a5659b07fd48b5d11f604d3b31539860584f63bdc933f016bd0

执行的提示信息：
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

节点加入成功后可以查看新的集群信息
# 查看节点信息
kubectl get nodes
# 查看集群信息
kubectl cluster-info

安装dashboard（可选）
# 安装dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

# 删除dashboard
kubectl -n kube-system delete $(kubectl -n kube-system get pod -o name | grep dashboard)

二、工作节点

设置主机名
hostnamectl set-hostname node02
hostnamectl set-hostname node03

修改hosts文件
vim /etc/hosts
192.168.1.91 master
192.168.1.92 node01
192.168.1.121 node02
192.168.1.122 node03

关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

禁用SELINUX
setenforce 0
sed -i -re '/^s*SELINUX=/s/^/#/' -e '$i\SELINUX=disabled' /etc/selinux/config

关闭swap
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab

ipv6设置
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

yum install -y kubelet-1.16.3 kubectl-1.16.3 kubeadm-1.16.3 --disableexcludes=kubernetes
systemctl enable --now kubelet

注意：worker节点需要从主节点copy /etc/kubernetes/admin.conf文件
scp /etc/kubernetes/admin.conf root@node01:/etc/kubernetes/

Node节点加入集群（仅在worker节点执行）创建主节点token（kubeadm token create）
kubeadm join 192.168.1.91:6443 --token enwm6l.2hyqoedt4q4ztm18 --discovery-token-ca-cert-hash sha256:15844ec4b9ce3a5659b07fd48b5d11f604d3b31539860584f63bdc933f016bd0 -v=10

如果添加失败，添加参数-v=10 查看错误原因
kubeadm join 192.168.1.91:6443 --token enwm6l.2hyqoedt4q4ztm18 --discovery-token-ca-cert-hash sha256:15844ec4b9ce3a5659b07fd48b5d11f604d3b31539860584f63bdc933f016bd0 -v=10

删除节点重新添加
主节点执行 kubectl delete node 节点名
重置工作节点 kubeadm reset