kubeadm安装k8s集群
系统配置：
1. master：2核CPU，2G内存 IP：192.168.10.200
2. node1：2核CPU，2G内存 IP：192.168.10.201
3. node2：2核CPU，2G内存 IP：192.168.10.202
4. centos7系统
一：三台机器都做，和hosts文件
1.master：配置IP和主机名
[root@localhost ~]# hostnamectl set-hostname master-iot.com
[root@localhost ~]# bash
2.node1：配置IP和主机名
[root@localhost ~]# hostnamectl set-hostname node1-iot.com
[root@localhost ~]# bash
3.node2：配置IP和主机名
[root@localhost ~]# hostnamectl set-hostname node2-iot.com
[root@localhost ~]# bash
二：三台机器都做：关闭防火墙和selinux
[root@master-iot ~]# iptables -F
[root@master-iot ~]# setenforce 0
setenforce: SELinux is disabled
三：三台机器都做：调整内核参数
[root@master-iot ~]# cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
net.ipv4.tcp_tw_recycle=0
vm.swappiness=0
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_instances=8192
fs.inotify.max_user_watches=8192
fs.file-max=52706963
net.ipv6.conf.all.disable_ipv6=1
net.netfilter.nf_conntrack_max=2310720
EOF
[root@master-iot ~]# sysctl -p
[root@master-iot ~]# swapoff -a
四：三台机器都做：配置docker-ce和k8s
[root@master-iot ~]# cd /etc/yum.repos.d/
[root@master-iot yum.repos.d]# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[root@master-iot yum.repos.d]# cat > kubernetes.repo << EOF
[kuberneten]
name=kubernetes repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
enable=1
EOF
[root@master-iot yum.repos.d]# wget https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
[root@master-iot yum.repos.d]# wget https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
[root@master-iot yum.repos.d]# rpm --import rpm-package-key.gpg yum-key.gpg
[root@node1-iot yum.repos.d]# yum -y install docker-ce kubelet kubeadm kubectl
[root@master-iot yum.repos.d]# systemctl enable docker && systemctl start docker && systemctl enable kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
五：master上面做：
[root@master-iot yum.repos.d]# kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12
[root@master-iot ~]# mkdir -p $HOME/.kube
[root@master-iot ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@master-iot ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
六：node上面做：
[root@node1-iot yum.repos.d]# kubeadm join 192.168.10.200:6443 --token pocal6.3iv9yvsbh25qbvgg --discovery-token-ca-cert-hash sha256:6d7f0c6443028e93d9cd42981de659c6bc7dc100b03a89b4ec814c08bbb82864
七：master上面做：
[root@master-iot ~]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
[root@master-iot ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
master-iot.com Ready master 17m v1.17.0
node1-iot.com Ready <none> 14m v1.17.0
node2-iot.com Ready <none> 15s v1.17.0
八：至此搭建完成！
