Myluzh Blog

K8S笔记-通过kubeadm方式搭建高可用集群（keepalived+haproxy）

发布时间: 2023-10-30 文章作者: myluzh 分类名称: Kubernetes

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0x00 介绍

虚拟ip         172.16.10.20     master.k8s.io         k8s-vip
master01     172.16.10.21     master01.k8s.io     master01
master02     172.16.10.22     master02.k8s.io     master02
node01        172.16.10.23     node01.k8s.io        node01

0x01 初始化（所有节点）

# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
 
# 关闭selinux
setenforce 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
 
# 关闭swap
swapoff -a
# 永久关闭swap
sed -ri 's/.*swap.*/#&/' /etc/fstab
 
# 根据规划设置master、worker节点主机名
hostnamectl set-hostname <hostname>
 
# 添加 hosts（所有节点）
cat >> /etc/hosts << EOF
172.16.10.20 master.k8s.io k8s-vip
172.16.10.21 master01.k8s.io k8s-master01
172.16.10.22 master02.k8s.io k8s-master02
172.16.10.23 node01.k8s.io ks8-node01
EOF
 
# 将桥接的 IPv4 流量传递到 iptables 的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
 
# 时间同步
yum install ntpdate -y
ntpdate time.windows.com
 
# 重启系统
reboot

0x02 部署keepalived（两个master节点）

1、在master节点中安装keepalived相关包

yum install -y conntrack-tools libseccomp libtool-ltdl psmisc
yum install -y keepalived

2、配置master节点keepalived配置

可以把master01 priority 设置为101，master02  priority 设置为100，这样master01的优先级就会高于02。默认情况下vip也会在01上。

# master01 master02 配置是一样的
cat > /etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived

global_defs {
    router_id k8s
}

vrrp_script check_haproxy {
    script "killall -0 haproxy"
    interval 3
    weight -2
    fall 10
    rise 2
}

vrrp_instance VI_1 {
    state MASTER
    # 网卡接口
    interface ens192
    virtual_router_id 51
    priority 250
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass ceb163ec013d66163d6ab
    }
    virtual_ipaddress {
    	# vip地址
        172.16.10.20
    }
    track_script {
        check_haproxy
    }
}
EOF

3、keepalived启动与检查

# 启动自启keepalived
systemctl start keepalived
systemctl enable keepalived
systemctl status keepalived
# 查看master网卡信息
ip address show ens192

0x03 部署haproxy

1、安装haproxy

yum install -y haproxy

2、配置haproxy

两台master节点的配置一样的，配置中声明了后端代理的两个master节点服务器，指定了haproxy运行的端口为16443等，因此16443端口为集群的入口。

cat > /etc/haproxy/haproxy.cfg << EOF
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    # to have these messages end up in /var/log/haproxy.log you will
    # need to:
    # 1) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    # 2) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log
    #
    log         127.0.0.1 local2
    
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon 
       
    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------  
defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000
#---------------------------------------------------------------------
# kubernetes apiserver frontend which proxys to the backends
#--------------------------------------------------------------------- 
frontend kubernetes-apiserver
    mode                 tcp
    bind                 *:16443
    option               tcplog
    default_backend      kubernetes-apiserver    
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend kubernetes-apiserver
    mode        tcp
    balance     roundrobin
    server      master01.k8s.io   172.16.10.21:6443 check
    server      master02.k8s.io   172.16.10.22:6443 check
#---------------------------------------------------------------------
# collection haproxy statistics message
#---------------------------------------------------------------------
listen stats
    bind                 *:1080
    stats auth           admin:awesomePassword
    stats refresh        5s
    stats realm          HAProxy\ Statistics
    stats uri            /admin?stats
EOF

3、启动与检查

# 启动与开机自启
systemctl enable haproxy
systemctl start haproxy
systemctl status haproxy
# 检查端口
netstat -lntup | grep haproxy

0x04 安装docker、kubeadm、kubelet（所有节点）

1、安装docker

yum -y install yum-utils
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce-18.06.3.ce-3.el7
docker --version

cat <<EOF > daemon.json
{
 "exec-opts": ["native.cgroupdriver=systemd"],
 "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]
}
EOF
mv daemon.json /etc/docker/
 
systemctl daemon-reload
systemctl enable docker
systemctl restart docker
systemctl status docker

2、安装k8s组件

# 添加k8s阿里云yum软件源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
# 指定版本号部署
yum install -y kubelet-1.16.3 kubeadm-1.16.3 kubectl-1.16.3
systemctl enable kubelet

0x05 部署k8s master

1、在具有vip的master节点上创建kubeadm配置文件（我这里的master01）

mkdir /usr/local/kubernetes/manifests -p
cd /usr/local/kubernetes/manifests/
# 编辑配置文件
vi kubeadm-config.yaml
apiServer:
  certSANs:
    - master01
    - master02
    - master.k8s.io
    - 172.16.10.20
    - 172.16.10.21
    - 172.16.10.22
    - 127.0.0.1
  extraArgs:
    authorization-mode: Node,RBAC
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta1
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: "master.k8s.io:16443"
controllerManager: {}
dns: 
  type: CoreDNS
etcd:
  local:    
    dataDir: /var/lib/etcd
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.16.3
networking: 
  dnsDomain: cluster.local  
  podSubnet: 10.244.0.0/16
  serviceSubnet: 10.1.0.0/16
scheduler: {}

2、在具有vip的master节点运行（我这里是master01）

kubeadm init --config kubeadm-config.yaml

3、根据提示配置环境变量

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# 验证节点状态是否正常
kubectl get nodes
kubectl get pods -n kube-system

4、按照提示保存下面内容，一会需要用到

  kubeadm join master.k8s.io:16443 --token g57ri1.wci79ladrai0hw2s \
    --discovery-token-ca-cert-hash sha256:adf6bfdd443b970a6db50c05882c2316a7d71b7f4df763a863d819cc6d3d3d70 \
    --control-plane

0x06 master02节点加入集群

1、复制密钥及相关文件

# 从master1复制密钥及相关文件到master02
ssh root@172.16.10.22 mkdir -p /etc/kubernetes/pki/etcd
scp /etc/kubernetes/admin.conf root@172.16.10.22:/etc/kubernetes
scp /etc/kubernetes/pki/{ca.*,sa.*,front-proxy-ca.*} root@172.16.10.22:/etc/kubernetes/pki
scp /etc/kubernetes/pki/etcd/ca.* root@172.16.10.22:/etc/kubernetes/pki/etcd

2、master02加入集群

执行在master1上init后输出的join命令,需要带上参数--control-plane表示把master控制节点加入集群。

kubeadm join master.k8s.io:16443 --token g57ri1.wci79ladrai0hw2s \
    --discovery-token-ca-cert-hash sha256:adf6bfdd443b970a6db50c05882c2316a7d71b7f4df763a863d819cc6d3d3d70 \
    --control-plane \

3、检查

kubectl get node
kubectl get pods --all-namespaces

0x07 加入k8s node节点

1、在node01上执行join

kubeadm join master.k8s.io:16443 --token g57ri1.wci79ladrai0hw2s \
    --discovery-token-ca-cert-hash sha256:adf6bfdd443b970a6db50c05882c2316a7d71b7f4df763a863d819cc6d3d3d70 

2、在master上检查

kubectl get node
kubectl get pods --all-namespaces

0x08 安装集群网络

# 从官方地址获取到flannel的yaml，在master1上执行
mkdir flannel
cd flannel
wget -c https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# 安装flannel网络
kubectl apply -f kube-flannel.yml 
# 检查
kubectl get pods -n kube-system

标签: k8s 高可用 keepalived haproxy