keepalived 高可用配置

安装

#ubuntu
apt-get install keepalived
#centos
yum install keepalived

master 节点配置，以nginx为例

cat > /etc/keepalived/keepalived.conf <<EOF
# master node
vrrp_script chk_nginx {
  script "killall -0 nginx"  #检查nginx进程
  interval 2 #每隔两秒一次
  weight 2 #检查ok的权重
}
vrrp_instance VI_1 {
  interface bond0 # 设置对应的网卡，需要修改
  state MASTER
  virtual_router_id 100 # 一个keepalived组需要一个单独的ID，主从一致，需要修改
  priority 101 #master的必须大于slave的值
  virtual_ipaddress {
    x.x.x.x # vip，需要修改
  }
  track_script {
    chk_nginx #上面检测的配置
  }
}
EOF

配置slave节点

cat > /etc/keepalived/keepalived.conf <<EOF
# master node
vrrp_script chk_nginx {
  script "killall -0 nginx"  #检查nginx进程
  interval 2 #每隔两秒一次
  weight 2 #检查ok的权重
}
vrrp_instance VI_1 {
  interface bond0 # 设置对应的网卡，需要修改
  state SLAVE
  virtual_router_id 100 # 一个keepalived组需要一个单独的ID，主从一致，需要修改
  priority 100 #master的必须大于slave的值
  virtual_ipaddress {
    x.x.x.x # vip，需要修改
  }
  track_script {
    chk_nginx #上面检测的配置
  }
}
EOF

启动keepalived
检查是否ok ip a查看