kubeadm部署多master节点高可用k8s1.16.2

sed -ri ‘s#(SELINUX=).*#\1disabled#‘ /etc/selinux/config
setenforce 0
systemctl disable firewalld
systemctl stop firewalld

swapoff ­-a ##临时关闭，重启失效
sed ­ri ‘s/.*swap.*/#&/‘ /etc/fstab ##永久关闭，需重启

cat >>/etc/hosts<<EOF
192.16.0.110 k8s-­110
192.16.0.111 k8s­-111
192.16.0.112 k8s­-112
192.16.0.113 k8s­-113
192.16.0.114 k8s­-114
EOF

#在 k8s­110 创建ssh密钥。
[root@k8s­110 ~]# ssh-­keygen ­-t rsa
#分发 k8s­110 的公钥，用于免密登录其他服务器
for n in `seq -w 110 114`;do ssh-copy-id k8s-$n;done

cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
vm.swappiness=0
EOF
sysctl --system 

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
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ­-e ip_vs ­-e nf_conntrack_ipv4

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 install -y keepalived haproxy

[root@node‐01 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
yuanyouwei@163.com
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_inteface ens160
virtual_router_id 88
advert_int 1
priority 100
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.16.0..200/24
}
}

global
chroot /var/lib/haproxy
daemon
group haproxy
user haproxy
log 127.0.0.1:514 local0 warning
pidfile /var/lib/haproxy.pid
maxconn 20000
spread‐checks 3
nbproc 8
defaults
log global
mode tcp
retries 3
option redispatch
listen https‐apiserver
bind 192.16.0..200:8443
mode tcp
balance roundrobin
timeout server 900s
timeout connect 15s
server apiserver01 192.16.0.110:6443 check port 6443 inter 5000 fall 5
server apiserver02 192.16.0.111:6443 check port 6443 inter 5000 fall 5
server apiserver03 192.16.0.112:6443 check port 6443 inter 5000 fall 5

systemctl enable keepalived && systemctl start keepalived
systemctl enable haproxy && systemctl start haproxy

yum install -­y kubelet­-1.16.2 kubeadm­-1.16.2 kubectl­-1.16.2 ipvsadm ipset docker­ce
##启动docker
systemctl enable docker && systemctl start docker
##设置kubelet开机启动
systemctl enable kubelet

[root@k8s­110 ~]# cat kubeadm-­init.yaml
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
-groups:
 - system:bootstrappers:kubeadm:default­node­token
 token: abcdef.0123456789abcdef
 ttl: 24h0m0s ##token有效期，添加节点如果token过期需要重新生成
 usages:
 - signing
 - authentication
kind: InitConfiguration
localAPIEndpoint:
 advertiseAddress: 192.16.0.110 ###本机真实IP
 bindPort: 6443
nodeRegistration:
 criSocket: /var/run/dockershim.sock
 name: k8s-­110
 taints:
 - effect: NoSchedule
  key: node­role.kubernetes.io/master
---
apiServer:
 timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: "192.16.0.200:8443" ###单节点这里写真实IP+6443，多master需要写VIP地址：端口
controllerManager: {}
dns:
  type: CoreDNS
etcd:
local:
 dataDir: /var/lib/etcd
imageRepository: registry.cn-­hangzhou.aliyuncs.com/google_containers ##镜像仓库地址修改为国内阿里云
kind: ClusterConfiguration
kubernetesVersion: v1.16.2 ##版本信息
networking:
 dnsDomain: cluster.local
 podSubnet: "10.244.0.0/16" ##增加此行，为pod网段配置，若没有则flannel网络启动失败
 serviceSubnet: 10.96.0.0/12
scheduler: {}

[root@k8s­110 ~]# kubeadm config images pull --­­config kubeadm­-init.yaml
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/kube­apiserver:v1.16.2
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/kube­controller­manager:v1.16.2
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/kube­scheduler:v1.16.2
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/kube­proxy:v1.16.2
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/pause:3.1
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/etcd:3.3.15­0
[config/images] Pulled registry.cn­hangzhou.aliyuncs.com/google_containers/coredns:1.6.2

[init]：指定版本进行初始化操作
[preflight] ：初始化前的检查和下载所需要的Docker镜像文件
[kubelet­start] ：生成kubelet的配置文件”/var/lib/kubelet/config.yaml”，没有这个文件kubelet无法启动，所以初始化之前的kubelet实际上启动失
败。
[certificates]：生成Kubernetes使用的证书，存放在/etc/kubernetes/pki目录中。
[kubeconfig] ：生成 KubeConfig 文件，存放在/etc/kubernetes目录中，组件之间通信需要使用对应文件。
[control­plane]：使用/etc/kubernetes/manifest目录下的YAML文件，安装 Master 组件。
[etcd]：使用/etc/kubernetes/manifest/etcd.yaml安装Etcd服务。
[wait­control­plane]：等待control­plan部署的Master组件启动。
[apiclient]：检查Master组件服务状态。
[uploadconfig]：更新配置
[kubelet]：使用configMap配置kubelet。
[patchnode]：更新CNI信息到Node上，通过注释的方式记录。
[mark­control­plane]：为当前节点打标签，打了角色Master，和不可调度标签，这样默认就不会使用Master节点来运行Pod。
[bootstrap­token]：生成token记录下来，后边使用kubeadm join往集群中添加节点时会用到
[addons]：安装附加组件CoreDNS和kube­proxy

[root@k8s­110 ~]# mkdir -­p $HOME/.kube
[root@k8s­110 ~]# cp -­i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@k8s­110 ~]# chown $(id -­u):$(id -­g) $HOME/.kube/config

USER=root
CONTROL_PLANE_IPS="k8s-­111 k8s­-112"
for host in ${CONTROL_PLANE_IPS}? do
ssh "${USER}"@$host "mkdir -­p /etc/kubernetes/pki/etcd"
scp ­-r /etc/kubernetes/pki/ca.* "${USER}"@$host:/etc/kubernetes/pki/
scp -­r /etc/kubernetes/pki/sa.* "${USER}"@$host:/etc/kubernetes/pki/
scp -­r /etc/kubernetes/pki/front­proxy­ca.* "${USER}"@$host:/etc/kubernetes/pki/
scp -­r /etc/kubernetes/pki/etcd/ca.* "${USER}"@$host:/etc/kubernetes/pki/etcd/
scp ­-r /etc/kubernetes/admin.conf "${USER}"@$host:/etc/kubernetes/
done

kubeadm join 192.16.0.200:8443 ­­--token abcdef.0123456789abcdef \ 
­­discovery­-token-­ca­-cert-­hash sha256:07eabe96310a5a83f8d3447a98cc713ce707466d6fbe721f15dea1b743dd79fb \ ­­
--control-­plane

kubeadm join 192.16.0.200:8443 --­­token abcdef.0123456789abcdef --discovery­-token-­ca-­cert-­hash sha256:07eabe96310a5a83f8d3447a98cc713ce707466d6fbe721f15dea1b743dd79fb

[root@k8s­110 ~]# kubectl apply ­-f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-­flannel.yml