k8s-高可用集群实现(keepalived+haproxy)

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huningfei 2021-04-18 10:10:46 博主文章分类：k8s

一环境说明：

需要单独拿出三台机器安装keep+haproxy，我这里为了方便，就和k8s一起共用了三台机器

master01  192.168.1.200
master02  192.168.1.210
master03  192.168.1.211
vip：192.168.1.222

1.1 安装keepalived（3台都安装）

yum install keepalived

1.2 编辑keepalived配置文件

global_defs {
   script_user root 
   enable_script_security

}

vrrp_script chk_haproxy {
    script "/bin/bash -c 'if [[ $(netstat -nlp | grep 9443) ]]; then exit 0; else exit 1; fi'"  # haproxy 检测
    interval 2  # 每2秒执行一次检测
    weight 11 # 权重变化}

vrrp_instance VI_1 {interface eth0

  state MASTER # backup节点设为BACKUP
  virtual_router_id 51 # id设为相同，表示是同一个虚拟路由组
  priority 100 #初始权重
nopreempt #可抢占

  unicast_peer {}

  virtual_ipaddress {
     192.168.1.222 #vip
  }

  authentication {
    auth_type PASS
    auth_pass password
  }

  track_script {
      chk_haproxy
  }

  notify "/container/service/keepalived/assets/notify.sh"}

二安装haproxy（3台都安装）

2.1编辑haproxy配置文件（三台机器配置一样）

global
    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

defaults
    mode                    tcp #支持https
    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


    #use_backend static          if url_static
    #default_backend             app
listen stats #网页形式
    mode http
    bind *:9443
    stats  uri       /admin/stats
    monitor-uri      /monitoruri
frontend showDoc
   
    bind *:8000
    use_backend      app #必须和下面的名称一致

backend app
    balance     roundrobin
    server  app1 192.168.1.210:6443 check
    server  app2 192.168.1.211:6443 check
    server  app3 192.168.1.200:6443 check