K8S高可用集群安装指南

1、设置主机名

通过hostnamectl命令修改每台主机名，以下是参考示例：

hostnamectl set-hostname k8s-master-0

主机名修改完毕后，在每台机器的hosts文件中都加入所有主机名与IP的映射关系，示例如下：

# 高可用浮动IP
10.16.10.60	vip-k8s-master
10.16.10.61	k8s-master-0
10.16.10.62	k8s-master-1
10.16.10.63	k8s-master-2
10.16.10.64	k8s-node-0
10.16.10.65	k8s-node-1
10.16.10.66	k8s-node-2
10.16.10.67	k8s-node-3

2、在所有控制节点上安装keepalived和haproxy

在每个控制节点上都执行以下命令进行安装：

yum install haproxy keepalived -y

在k8s-master-0上创建/etc/keepalived/check_apiserver.sh脚本：

#!/bin/sh
APISERVER_VIP=10.16.10.60
APISERVER_DEST_PORT=6443

errorExit() {
    echo "*** $*" 1>&2
    exit 1
}

curl --silent --max-time 2 --insecure https://localhost:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://localhost:${APISERVER_DEST_PORT}/"
if ip addr | grep -q ${APISERVER_VIP}; then
    curl --silent --max-time 2 --insecure https://${APISERVER_VIP}:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://${APISERVER_VIP}:${APISERVER_DEST_PORT}/"
fi

添加执行权限：

chmod +x /etc/keepalived/check_apiserver.sh

修改keepalived配置文件：

# 备份文件
cp /etc/keepalived/keepalived.conf{,.save}
# 清空文件
> /etc/keepalived/keepalived.conf

将以下内容粘贴到/etc/keepalived/keepalived.conf文件中：

! /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script check_apiserver {
  script "/etc/keepalived/check_apiserver.sh"
  interval 3
  weight -2
  fall 10
  rise 2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 151
    priority 255
    authentication {
        auth_type PASS
        auth_pass P@##D321!
    }
    virtual_ipaddress {
        10.16.10.60/24
    }
    track_script {
        check_apiserver
    }
}

注意： 将keepalived.conf复制到另外两台控制节点时将state修改成SLAVE，priority改成254和253。

修改haproxy配置文件：

# 备份文件
cp /etc/haproxy/haproxy.cfg{,.save}

删除default块之后的全部内容，并添加以下内容：

#---------------------------------------------------------------------
# apiserver frontend which proxys to the masters
#---------------------------------------------------------------------
frontend apiserver
    bind *:8443
    mode tcp
    option tcplog
    default_backend apiserver
#---------------------------------------------------------------------
# round robin balancing for apiserver
#---------------------------------------------------------------------
backend apiserver
    option httpchk GET /healthz
    http-check expect status 200
    mode tcp
    option ssl-hello-chk
    balance     roundrobin
        server k8s-master-0 10.16.10.61:6443 check
        server k8s-master-1 10.16.10.62:6443 check
        server k8s-master-2 10.16.10.63:6443 check

将keepalived和haproxy配置文件复制到其他两台服务器：

for f in k8s-master-1 k8s-master-2; do scp /etc/keepalived/check_apiserver.sh /etc/keepalived/keepalived.conf root@$f:/etc/keepalived; scp /etc/haproxy/haproxy.cfg root@$f:/etc/haproxy; done

修改系统配置：

# 修改防火墙
firewall-cmd --add-rich-rule='rule protocol value="vrrp" accept' --permanent
firewall-cmd --permanent --add-port=8443/tcp
firewall-cmd --reload

# 启用服务
systemctl enable keepalived --now
systemctl enable haproxy --now

# 修改控制节点防火墙
firewall-cmd --permanent --add-port=6443/tcp
firewall-cmd --permanent --add-port=2379-2380/tcp
firewall-cmd --permanent --add-port=10250/tcp
firewall-cmd --permanent --add-port=10251/tcp
firewall-cmd --permanent --add-port=10252/tcp
firewall-cmd --permanent --add-port=179/tcp
firewall-cmd --permanent --add-port=4789/udp
firewall-cmd --reload
modprobe br_netfilter
sh -c "echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables"
sh -c "echo '1' > /proc/sys/net/ipv4/ip_forward"

# 修改工作节点防火墙
firewall-cmd --permanent --add-port=10250/tcp
firewall-cmd --permanent --add-port=30000-32767/tcp                                                   
firewall-cmd --permanent --add-port=179/tcp
firewall-cmd --permanent --add-port=4789/udp
firewall-cmd --reload
modprobe br_netfilter
sh -c "echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables"
sh -c "echo '1' > /proc/sys/net/ipv4/ip_forward"

3、关闭swap

如果不关闭swap，kubernetes运行会出现错误，即使安装成功了，node重启后也会出现kubernetes server运行错误。

swapoff -a 
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

4、安装kubeadm、kubelet、kubectl

添加软件源：

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF

安装软件：

yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

在所有节点启用服务：

systemctl enable kubelet --now

5、containerd配置

注释 disabled_plugins = ["cri"] ，增加私有镜像仓库配置：

[plugins]
  [plugins."io.containerd.grpc.v1.cri"]
    sandbox_image = "swr.cq-region-2.sgic.sgcc.com.cn/k8s/pause:3.9"
  [plugins.cri]
    [plugins.cri.registry]
      [plugins.cri.registry.mirrors]
        [plugins.cri.registry.mirrors."swr.cq-region-2.sgic.sgcc.com.cn"]
          endpoint = ["http://swr.cq-region-2.sgic.sgcc.com.cn"]

sandbox image配置没有生效，集群在部署时总是去获取，此处暂时使用一个折中方案，在本地给镜像新增tag：

ctr -n k8s.io i tag swr.cq-region-2.sgic.sgcc.com.cn/k8s/pause:3.9 registry.k8s.io/pause:3.6

6、初始化集群

kubeadm init --control-plane-endpoint "vip-k8s-master:8443" --upload-certs  --pod-network-cidr=10.244.10.0/16 --image-repository=swr.cq-region-2.sgic.sgcc.com.cn/k8s --v=5

部署网络组件：

kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.26.1/manifests/tigera-operator.yaml

在k8s-master-1和k8s-master-2节点上执行命令示例如下：

kubeadm join vip-k8s-master:8443 --token r3g4lg.808yznkgswngn1el \
	--discovery-token-ca-cert-hash sha256:37501bfeab42b97b9a9a18728aea7a00fe3ba5a28c0207fc72180827612340c2 \
	--control-plane --certificate-key 160ab777510190cd1576e7bdb6e24153d2e55acf6f2c6f972cc52eae364f560f

在工作节点上执行命令示例如下：

kubeadm join vip-k8s-master:8443 --token r3g4lg.808yznkgswngn1el \
	--discovery-token-ca-cert-hash sha256:37501bfeab42b97b9a9a18728aea7a00fe3ba5a28c0207fc72180827612340c2

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