• 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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  • 原文地址:https://www.cnblogs.com/seasonzone/p/14845076.html
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