kubeadm单主集群部署

学习文档：https://blog.csdn.net/networken/article/details/84991940

#master节点:
hostnamectl set-hostname k8s-master
#node1节点：
hostnamectl set-hostname k8s-node1
#node2节点:
hostnamectl set-hostname k8s-node2


#!/bin/bash
#修改/etc/hosts文件
cat >> /etc/hosts << EOF
192.168.1.132 k8s-master
192.168.1.129 k8s-node1
192.168.1.130 k8s-node2
192.168.1.132 harbor
EOF
ssh-keygen -t rsa
for n in `seq -w 1 2`;do ssh-copy-id k8s-node$n;done

#关闭防火墙和selinux
systemctl stop firewalld && systemctl disable firewalld
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config && setenforce 0
#关闭swap
swapoff -a
yes | cp /etc/fstab /etc/fstab_bak
cat /etc/fstab_bak |grep -v swap > /etc/fstab

#kube-proxy开启ipvs的前提条件
#由于ipvs已经加入到了内核的主干，所以为kube-proxy开启ipvs的前提需要加载以下的内核模块：
#在所有的Kubernetes节点执行以下脚本:
#!/bin/bash
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
#执行脚本
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4
lsmod | grep -e ip_vs -e nf_conntrack_ipv4

yum install ipset ipvsadm -y

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

wget http://mirrors.aliyun.com/repo/Centos-7.repo -O /etc/yum.repos.d/CentOS-Base.repo
wget http://mirrors.aliyun.com/repo/epel-7.repo -O /etc/yum.repos.d/epel.repo 
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo

yum -y install kubernetes-cni = 0.6.0
yum install -y kubelet-1.16.1 kubeadm-1.16.1 kubectl-1.16.1 ipvsadm ipset docker-ce-18.06.1.ce

systemctl enable docker && systemctl start docker
systemctl enable kubelet && systemctl start kubelet

cat >/etc/docker/daemon.json <<EOF
{
	"exec-opts":["native.cgroupdriver=systemd"],#配置systemd的cgroup隔离方式
	"log-driver":"json-file",#把日志的存储方式改为json-file的类型
	"log-opts":{
		"max-size":"100m"#最大大小为100m
	}
}
EOF
systemctl daemon-reload && systemctl restart docker && systemctl enable docker

###############################################################################
#安装方式一
kubeadm init 
     --apiserver-advertise-address=192.168.2.4 
     --image-repository registry.aliyuncs.com/google_containers 
     --kubernetes-version v1.16.1 
     --pod-network-cidr=10.244.0.0/16

#安装方式二
#下载镜像
docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.16.1 
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.16.1 
docker pull gcr.azk8s.cn/google_containers/etcd-amd64:3.3.15
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.16.1 
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.16.1
docker pull coredns/coredns:1.6.2 
docker pull mirrorgooglecontainers/pause-amd64:3.1
#修改标签
docker tag mirrorgooglecontainers/kube-controller-manager-amd64:v1.16.1 k8s.gcr.io/kube-controller-manager:v1.16.0
docker tag mirrorgooglecontainers/kube-apiserver-amd64:v1.16.1 k8s.gcr.io/kube-apiserver:v1.16.0
docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.16.1 k8s.gcr.io/kube-proxy:v1.16.0
docker tag mirrorgooglecontainers/kube-scheduler-amd64:v1.16.1 k8s.gcr.io/kube-scheduler:v1.16.0
docker tag coredns/coredns:1.6.2 k8s.gcr.io/coredns:1.6.2
docker tag gcr.azk8s.cn/google_containers/etcd-amd64:3.3.15 k8s.gcr.io/etcd:3.3.15-0
docker tag mirrorgooglecontainers/pause-amd64:3.1 k8s.gcr.io/pause:3.1

docker images | grep k8s

mkdir ~/install-k8s/
mkdir ~/install-k8s/core
mkdir ~/install-k8s/plugin
cd ~/install-k8s/core
kubeadm config print init-defaults > kubeadm-config.yaml
cat -n kubeadm-config.yaml|sed -n '12p;34p;37p;40,45p'
#配置文件末尾添加
--- 
apiVersion: kubeproxy.config.k8s.io/v1alpha1 
kind:KubeProxyConfiguration 
featureGates: 
  SupportIPVSProxyMode:true
mode: ipvs

#集群初始化
kubeadm init --config=kubeadm-config.yaml | tee kubeadm-init.log
###############################################################################
#安装完成后执行
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

#node节点加入之前,将镜像导入node
kubeadm join 192.168.1.131:6443 --token abcdef.0123456789abcdef 
    --discovery-token-ca-cert-hash sha256:022226e355198e32ecc4e735ae39f4b10a8eba8ad782aa66bac448d881684d94
#清除节点
kubectl delete node k8s-node2
kubeadm reset

#安装flannel
跨宿主机访问pod需要网络插件
cd ~/install-k8s/plugin
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl create -f kube-flannel.yml

kubectl get node --all-namespaces -o wide

#查看日志
journalctl -u docker.service
#查看节点信息
kubectl describe pod coredns-5644d7b6d9-5rfc8 --namespace=kube-system