安装部署keepalived的HA环境

#master01 配置：
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
   router_id LVS_DEVEL
   script_user root
   enable_script_security
}
vrrp_script chk_apiserver {
   script "/etc/keepalived/check_apiserver.sh"
   interval 5
   weight -5
   fall 2
   rise 1 #检测一次成功，则认为在线
}
vrrp_instance VI_1 {
   state BACKUP
   nopreempt
   interface ens160
   mcast_src_ip 10.0.0.20
   virtual_router_id 51
   priority 100
   advert_int 2
   authentication {
       auth_type PASS
       auth_pass K8SHA_KA_AUTH
   }
   virtual_ipaddress {
       10.0.0.30
   }
   track_script {
      chk_apiserver
   }
}
EOF


#Master02 配置：
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
   router_id LVS_DEVEL
   script_user root
   enable_script_security
}
vrrp_script chk_apiserver {
   script "/etc/keepalived/check_apiserver.sh"
  interval 5
   weight -5
   fall 2 
   rise 1
}
vrrp_instance VI_1 {
   state BACKUP
   nopreempt
   interface ens160
   mcast_src_ip 10.0.0.21
   virtual_router_id 51
   priority 99
   advert_int 2
   authentication {
       auth_type PASS
       auth_pass K8SHA_KA_AUTH
   }
   virtual_ipaddress {
       10.0.0.30
   }
   track_script {
      chk_apiserver
   }
}
EOF


#Master03 配置：
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
   router_id LVS_DEVEL
   script_user root
   enable_script_security
}
vrrp_script chk_apiserver {
   script "/etc/keepalived/check_apiserver.sh"
 interval 5
   weight -5
   fall 2 
   rise 1
}
vrrp_instance VI_1 {
   state BACKUP
   nopreempt
   interface ens160
   mcast_src_ip 10.0.0.22
   virtual_router_id 51
   priority 98
   advert_int 2
   authentication {
       auth_type PASS
       auth_pass K8SHA_KA_AUTH
   }
   virtual_ipaddress {
       10.0.0.30
   }
    track_script {
      chk_apiserver
   }
EOF

cat > /etc/keepalived/check_apiserver.sh <<"EOF"
#!/bin/bash
err=0
for k in $(seq 1 3)
do
   check_code=$(pgrep haproxy)
   if [[ $check_code == "" ]]; then
       err=$(expr $err + 1)
       sleep 1
       continue
   else
       err=0
       break
   fi
done


if [[ $err != "0" ]]; then
   echo "systemctl stop keepalived"
   /usr/bin/systemctl stop keepalived
   exit 1
else
   exit 0
fi
EOF


chmod u+x /etc/keepalived/check_apiserver.sh

启动服务

systemctl daemon-reload
systemctl enable --now keepalived