Keepalived2.0.18 安装

1 下载

直接从 Keepalived 官方下载所需版本，这里我下载的为 2.x 的版本。下载后进行解压：

wget https://www.keepalived.org/software/keepalived-2.0.18.tar.gz
tar -zxvf keepalived-2.0.18.tar.gz
cd /opt/keepalived-2.0.18/

2 编译

安装相关依赖后进行编译：

# 安装依赖
yum -y install libnl libnl-devel
# 编译安装
./configure --prefix=/usr/local/keepalived-2.0.18
make && make install

3 环境配置

由于不是采用 yum 的方式进行安装，而是采用压缩包的方式进行安装，此时需要进行环境配置，具体如下：

Keepalived 默认会从 /etc/keepalived/keepalived.conf 路径读取配置文件，所以需要将安装后的配置文件拷贝到该路径：

# 创建文件目录
mkdir /etc/keepalived
# 拷贝
cp /usr/local/keepalived-2.0.18/etc/keepalived/keepalived.conf /etc/keepalived/

将所有 Keepalived 脚本拷贝到 /etc/init.d/ 目录下：

# 编译目录中的脚本
cp /opt/keepalived-2.0.18/keepalived/etc/init.d/keepalived /etc/init.d/
# 安装目录中的脚本
cp /usr/local/keepalived-2.0.18/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived-2.0.18/sbin/keepalived /usr/sbin/

设置开机自启动：

chmod +x /etc/init.d/keepalived
chkconfig --add keepalived
systemctl enable keepalived.service

4 配置

先确认网卡

[root@rabbit-node1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether fa:16:3e:52:87:80 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.12/24 brd 192.168.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet 192.168.0.200/32 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe52:8780/64 scope link 
       valid_lft forever preferred_lft forever
[root@rabbit-node1 ~]# 

global_defs {
   # 路由id,主备节点不能相同
   router_id node1
}

# 自定义监控脚本
vrrp_script chk_haproxy {
    # 脚本位置
    script "/etc/keepalived/haproxy_check.sh" 
    # 脚本执行的时间间隔
    interval 5 
    weight 10
}

vrrp_instance VI_1 {
    # Keepalived的角色，MASTER 表示主节点，BACKUP 表示备份节点
    state MASTER  
    # 指定监测的网卡，可以使用 ifconfig 进行查看
    interface eth0
    # 虚拟路由的id，主备节点需要设置为相同
    virtual_router_id 51
    # 优先级，主节点的优先级需要设置比备份节点高
    priority 100 
    # 设置主备之间的检查时间，单位为秒 
    advert_int 1 
    # 定义验证类型和密码
    authentication { 
        auth_type PASS
        auth_pass 123456
    }

    # 调用上面自定义的监控脚本
    track_script {
        chk_haproxy
    }

    virtual_ipaddress {
        # 虚拟IP地址，可以设置多个
        192.168.0.200  
    }
}

4.5 启动服务

启动 KeepAlived 服务，命令如下：

systemctl start keepalived