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关于keepalived:Keepalived

jiezi

Keepalived 装置部署

  1. 下载地址：
    点我下载
  2. 通过 ftp 工具上传到 linux 中，/home/software
  3. 解压
    tar -zxvf keepalived-2.0.18.tar.gz
  4. 解压后进入到解压进去的目录，看到会有 configure，那么就能够做配置了（配置装置和 nginx 截然不同）

配置 Keepalived – 主

  1. 通过命令 vim keepalived.conf 关上配置文件

    global_defs {
# 路由 id：以后装置 keepalived 的节点主机标识符，保障全局惟一
router_id keep_171
}
vrrp_instance VI_1 {
# 示意状态是 MASTER 主机还是备用机 BACKUP
state MASTER
# 该实例绑定的网卡
interface ens33
# 保障主备节点统一即可
virtual_router_id 51
# 权重，master 权重个别高于 backup，如果有多个，那就是选举，谁的权重高，谁就入选
priority 100
# 主备之间同步查看工夫距离，单位秒
advert_int 2
# 认证权限明码，避免非法节点进入
authentication {
auth_type PASS
auth_pass 1111
}
# 虚构进去的 ip，能够有多个（vip）virtual_ipaddress {192.168.1.161}
}

    附：查看网卡名称

  2. 启动 Keepalived
    在 sbin 目录中进行启动（同 nginx），如下图：

配置 Keepalived – 备

  1. 通过命令 vim keepalived.conf 关上配置文件

    global_defs {router_id keep_172}
vrrp_instance VI_1 {
# 备用机设置为 BACKUP
state BACKUP
interface ens33
virtual_router_id 51
# 权重低于 MASTER
priority 80
advert_int 2
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
# 留神：主备两台的 vip 都是一样的，绑定到同一个 vip
192.168.1.161
}
}

  2. 启动 Keepalived

    # 启动 keepalived
systemctl start keepalived
# 进行 keepalived
systemctl stop keepalived
# 重启 keepalived
systemctl restart keepalived

  3. 查看过程

    ps -ef|grep keepalived

Keepalived 配置 Nginx 主动重启

  1. 减少 Nginx 重启检测脚本

    vim /etc/keepalived/check_nginx_alive_or_not.sh
    #!/bin/bash
A=`ps -C nginx --no-header |wc -l`
# 判断 nginx 是否宕机，如果宕机了，尝试重启
if [$A -eq 0];then
/usr/local/nginx/sbin/nginx
# 期待一小会再次查看 nginx，如果没有启动胜利，则进行 keepalived，使其启动备用机
sleep 3
if [`ps -C nginx --no-header |wc -l` -eq 0];then
killall keepalived
fi
fi

    减少运行权限

    chmod +x /etc/keepalived/check_nginx_alive_or_not.sh

  2. 配置 keepalived 监听 nginx 脚本

    vrrp_script check_nginx_alive {
script "/etc/keepalived/check_nginx_alive_or_not.sh"
interval 2 # 每隔两秒运行上一行脚本
weight 10 # 如果脚本运行失败，则降级权重 +10
}

  3. 在 vrrp_instance 中新增监控的脚本

    track_script {check_nginx_alive # 追踪 nginx 脚本}

  4. 重启 Keepalived 使得配置文件失效

    systemctl restart keepalived

配置 Keepalived 双主热备
规定：以一个虚构 ip 分组归为同一个路由
主节点配置：

global_defs {router_id keep_171}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {192.168.1.161}
}
vrrp_instance VI_2 {
state BACKUP
interface ens33
virtual_router_id 52
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {192.168.1.162}
}

备用节点配置

global_defs {router_id keep_172}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {192.168.1.161}
退出移动版