CentOS 7 Keepalived 高可用 安装 配置

环境

host1 192.168.0.1  # 主机1

host2 192.168.0.2  # 主机2

serviceIP 192.168.0.3  # 服务IP 虚拟IP 浮动IP

规则：

谁先启动谁是master，绑定服务IP；

故障节点为master时，发生切换；

故障节点恢复后，不发生切换；

 

开始

yum install -y keepalived # 安装keepalived

cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.`date +%Y%m%d_%H%M%S` # 备份配置文件

# 写入配置文件
cat << \EOF > /etc/keepalived/keepalived.conf
# node1

# 全局参数
global_defs {

   # 启动keepalived时有警告
   # Keepalived_vrrp: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
   # 添加下面2个参数
   script_user root
   enable_script_security
}

# 健康检查脚本，检查Haproxy状态，脚本返回0正常，返回非0失败，失败后节点降级 weight -15
# 名字自定义
vrrp_script maint-checkHaproxy {
    script "/etc/keepalived/checkHaproxy.sh"
    interval 3 # 检查间隔3秒
    weight -15 # 降低本节点权重
    fall 2   # 2次失败算