CentOS安装Keepalived版本2.0.18-ITB运维部落—http://www.itbcn.cn—ITB运维技术交流之家平台
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CentOS安装Keepalived版本2.0.18

1、基础依赖包安装

yum install gcc
yum -y install openssl-devel
yum -y install libnl libnl-devel
yum -y install libnfnetlink-devel
yum -y install net-tools
yum -y install vim

2、安装包下载、解压编译和安装

官网下载keepalived安装包:

https://www.keepalived.org/download.html

此处下载最新版本2.0.18

将keepalived-2.0.18.tar.gz安装包上传到服务器上的某个目录下,此处为/usr/local/src目录下:

进入安装目录下并解压安装包:

cd /usr/local/src/
tar -zxvf keepalived-2.0.18.tar.gz

将解压的目录移动到/usr/local/keepalived下并进入移动后的目录:

mv keepalived-2.0.18 ../keepalived
cd ../keepalived/

生成makefile文件:

./configure

安装执行:

make && make install

完成后会在以下路径生成:

/usr/local/etc/keepalived/keepalived.conf
/usr/local/etc/sysconfig/keepalived
/usr/local/sbin/keepalived

3 、初始化及启动

将配置文件放到默认路径下:

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

将keepalived启动脚本(源码目录下),放到/etc/init.d/目录下:

cp /usr/local/keepalived/keepalived/etc/init.d/keepalived  /etc/rc.d/init.d/

将keepalived启动脚本变量引用文件放到/etc/sysconfig/目录下:

cp /usr/local/keepalived/keepalived/etc/sysconfig/keepalived  /etc/sysconfig/

将keepalived主程序加入到环境变量/usr/sbin/目录下:

cp /usr/local/sbin/keepalived  /usr/sbin/

启动keepalived:

service keepalived start

附注:

service keepalived stop //停止服务
service keepalived status //查看服务状态

4 、配置文件修改

停止keepalived服务,修改keepalived.conf配置文件(第3步中的/etc/keepalived/keepalived.conf )并重新启动keepalived服务加载配置文件。

配置属性说明可参照keepalived.conf文件,在具体使用中可参考修改:

复制代码
! Configuration File for keepalived
# 全局定义块
global_defs {
   # 邮件通知配置,用于服务有故障时发送邮件报警,可选项
   notification_email {
     [email protected]
   }
   # 通知邮件从哪里发出
   notification_email_from [email protected]
   # 通知邮件的smtp地址
   smtp_server 127.0.0.1
   # 连接smtp服务器的超时时间
   smtp_connect_timeout 30
   # 标识本节点的字条串,通常为hostname,但不一定非得是hostname。故障发生时,邮件通知会用到
   router_id LVS_DEVEL
}
# 做健康检查的脚本配置,当时检查失败时会将vrrp_instance的priority减少相应的值
vrrp_script chk_haproxy {
    # 待执行脚本
    script "/etc/keepalived/chk_nginx.sh"
    # 执行间隔
    interval 2
    # 控制priority增减
    weight 2
}
# VRRP实例定义块
vrrp_instance VI_1 {
    # 标识当前节点的状态,可以是MASTER或BACKUP,当其他节点keepalived启动时会将priority比较大的节点选举为MASTER
    state MASTER
    # 节点固有IP(非VIP)的网卡,用来发VRRP包
    interface ens192
    # 取值在0-255之间,用来区分多个instance的VRRP组播。同一网段中virtual_router_id的值不能重复,否则会出错
    virtual_router_id 100
    # 用来选举master的,要成为master,那么这个选项的值最好高于其他机器50个点,该项取值范围是[1-254](在此范围之外会被识别成默认值100)
    priority 200
    # 发VRRP包的时间间隔,即多久进行一次master选举(可以认为是健康查检时间间隔)
    advert_int 1
    # 认证区域,认证类型有PASS和HA(IPSEC),推荐使用PASS(密码只识别前8位)
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    # 调用chk_http_port中定义的脚本,当使用track_script时可以不用加nopreempt,只需要加上preempt_delay 5,这里的间隔时间要大于vrrp_script中定义的时长
    track_script {
        chk_haproxy
    }
    # 允许一个priority比较低的节点作为master,即使有priority更高的节点启动。nopreemt必须在state为BACKUP的节点上才生效(因为是BACKUP节点决定是否来成为MASTER的)
    nopreempt
    # 启动多久之后进行接管资源(VIP/Route信息等),前提是没有nopreempt选项
    preempt_delay 300
    # 虚拟ip地址
    virtual_ipaddress {
        192.168.26.34
    }
}
# 虚拟服务定义块
virtual_server 192.168.26.34 9999{
    # 延迟轮询时间(单位秒)
    delay_loop 6
    # 后端调试算法
    lb_algo wrr
    # LVS调度类型NAT/DR/TUN
    lb_kind DR
    # nat掩码
    nat_mask 255.255.255.0
    # 持久化超时时间,保持客户端的请求在这个时间段内全部发到同一个真实服务器,解决客户连接的相关性问题
    persistence_timeout 1
    # 传输协议
    protocol TCP
    # 真实提供服务的服务器
    real_server 192.168.26.36 9999 {
        # 权重
        weight 1
        # 健康检查方式 HTTP_GET|SSL_GET|TCP_CHECK|SMTP_CHECK|MISC_CHECK
        TCP_CHECK {
            # 连接超时时间
            connect_timeout 10
            # 检测失败后的重试次数,若达到重试次数还是失败则将其从服务器池中移除
            nb_get_retry 3
            # 下次重试的时间延迟
            delay_before_retry 3
            # 连接端口
            connect_port 9999 
        }   
    }   
    real_server 192.168.26.54 9999 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
            connect_port 9999
        }
    }
}

virtual_server 192.168.26.34 3306{
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 1
    protocol TCP
    real_server 192.168.26.36 3306 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
    real_server 192.168.26.54 3306 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}
复制代码

修改完之后重新启动

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