Centos7下安装运行keepalived

master服务器ip地址:192.168.0.182

slave服务器ip地址:192.168.0.189

虚拟ip(VIP,一个尚未占用的内网ip即可)地址:192.168.0.180

 

 确认使用的网卡

使用第2个网卡【enp0s3】

 

使用wget命令下载,下载位置/usr/local/

keepalived下载地址:http://www.keepalived.org/download.html

wget http://www.keepalived.org/software/keepalived-1.4.2.tar.gz

解压:

tar zxvf keepalived-1.4.2.tar.gz

安装依赖插件:

yum install -y gcc openssl-devel popt-devel

编译安装:

cd keepalived-1.4.2

#指定安装目录
./configure --prefix=/usr/local/keepalived

make && make install

运行前配置

复制代码
#
cp /usr/local/keepalived-1.4.2/keepalived/etc/init.d/keepalived /etc/init.d/

#
mkdir /etc/keepalived

#
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

#
cp /usr/local/keepalived-1.4.2/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

#
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
复制代码

修改配置文件:

vim /etc/keepalived/keepalived.conf

具体配置如下:

master服务器配置:

复制代码
! Configuration File for keepalived

global_defs {
    #一个没重复的名字即可
    router_id xxoo_master
}

# 检测nginx是否运行
vrrp_script chk_nginx {
        script "/etc/keepalived/nginx_check.sh"
        interval 2
        weight -20
}

vrrp_instance VI_1 {

    # 此处不设置为MASTER,通过priority来竞争master
    state BACKUP

    # 网卡名字,文章下方会给出如何获取网卡名字的方法
    interface enp0s3

    # 同一个keepalived集群的virtual_router_id相同
    virtual_router_id 51

    # 权重,master要大于slave
    priority 100

    # 主备通讯时间间隔
    advert_int 1

    # 如果两节点的上联交换机禁用了组播,则采用vrrp单播通告的方式
    # 本机ip
    unicast_src_ip 192.168.0.182
    unicast_peer {
        # 其他机器ip
        192.168.0.189
    }

    # 设置nopreempt防止抢占资源
    nopreempt

    # 主备保持一致
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    # 与上方nginx运行状况检测呼应
    track_script {
        chk_nginx
    }

    virtual_ipaddress {
        # 虚拟ip地址(VIP,一个尚未占用的内网ip即可)
        192.168.0.180
    }
}
复制代码

 

slave服务器配置:

复制代码
! Configuration File for keepalived

global_defs {
    #一个没重复的名字即可
    router_id xxoo_slave
}

# 检测nginx是否运行
vrrp_script chk_nginx {
        script "/etc/keepalived/nginx_check.sh"
        interval 2
        weight -20
}

vrrp_instance VI_1 {

    # 此处不设置为MASTER,通过priority来竞争master
    state BACKUP

    # 网卡名字,文章下方会给出如何获取网卡名字的方法
    interface enp0s3

    # 同一个keepalived集群的virtual_router_id相同
    virtual_router_id 51

    # 权重,master要大于slave
    priority 90

    # 主备通讯时间间隔
    advert_int 1

    # 如果两节点的上联交换机禁用了组播,则采用vrrp单播通告的方式
    # 本机ip
    unicast_src_ip 192.168.0.189
    unicast_peer {
        # 其他机器ip
        192.168.0.182
    }

    # 设置nopreempt防止抢占资源
    nopreempt

    # 主备保持一致
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    # 与上方nginx运行状况检测呼应
    track_script {
        chk_nginx
    }

    virtual_ipaddress {
        # 虚拟ip地址(VIP,一个尚未占用的内网ip即可)
        192.168.0.180
    }
}
复制代码

 

nginx监听脚本:

#创建nginx检测脚本
#touch nginx_check.sh

#给脚本增加可执行权限
#chmod +x nginx_check.sh

脚本添加如下内容:

#! /bin/bash
pidof nginx
if [ $? -ne 0 ];then
/etc/init.d/keepalived stop
fi

 

防止出现脑裂现象(主备同时获取了VIP地址)

复制代码
# 指定keepalived配置的网卡:enp0s3,固定的VRRP广播地址:224.0.0.18
firewall-cmd --direct --permanent --add-rule ipv4 filter INPUT 0 --in-interface enp0s3 --destination 224.0.0.18 --protocol vrrp -j ACCEPT
firewall-cmd --direct --permanent --add-rule ipv4 filter OUTPUT 0 --out-interface enp0s3 --destination 224.0.0.18 --protocol vrrp -j ACCEPT
firewall-cmd --reload

# 查看配置的规则
firewall-cmd --direct --get-rules ipv4 filter INPUT
firewall-cmd --direct --get-rules ipv4 filter OUTPUT
复制代码

 

启动服务:

service keepalived start

# 配置开机自启动
systemctl enable keepalived

 

查看服务启动情况:

ps -aux |grep keepalived

 

查看启动日志:

journalctl -xe

 

查看keepalived日志

tail -f  /var/log/messages

 

配置成功后的效果。enp0s3是网卡名字;192.168.0.180是虚拟ip,已经成功绑定到网卡上。

 

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https://www.cnblogs.com/xxoome/p/8621677.html
posted @ 2021-06-03 14:37  seasonzone  阅读(167)  评论(0编辑  收藏  举报