Keepalived HAProxy mysql 配置HA

mysql 和 HAProxy 配置请参考  上一篇随笔

keepalived 最简单的配置高可用

1.修改/etc/sysctl.conf

　　

vi /etc/sysctl.conf

首先找到net.ipv4.ip_forward=1这个配置，并其注释去除，然后在下面插入net.ipv4.ip_nonlocal_bind=1这句配置

 2.更新环境

sudo apt-get install libssl-dev openssl libpopt-dev daemon 

3.下载安装包

wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz

4.解压

tar zxvf keepalived-1.2.18.tar.gz

5.切换到解压目录

cd keepalived-1.2.18

6.执行命令

./configure --prefix=/usr/local/keepalived

7.执行make命令

make

8. 执行make install

make install

9.将keepalived作为系统服务启动

    # mkdir /etc/sysconfig

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

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

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

10.把keepalived 的配置文件放到/etc/keepalived 下,keepalived默认会读取这个文件。

    # mkdir /etc/keepalived

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

11. 修改/etc/keepalived/keepalived.conf ， （最好在配置文件中把里边的注释都删掉）

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
    root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id node-00
   vrrp_mcast_group4 224.0.38.12
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 38     //两台服务器的这个id不能一样
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass x1er44q
    }
    virtual_ipaddress {
       192.168.117.111  dev eth0
    }

    smtp_alert
}

}

- virtual_ipaddress ：就是keepalived向外提供可访问的ip 

-interface : 这个例子是eth0 ,根据自己机器的网卡确定

12.将keepalived作为系统启动服务：

mkdir -p /etc/rc.d/init.d

ln -s /lib/lsb/init-functions /etc/rc.d/init.d/functions

因为ubuntu 和centos 系统目录有差别，所以要创建上边的连接

13.创建subsys  目录

mkdir /var/lock/subsys 

14.修改  /etc/rc.local 

vi /etc/rc.local 

在exit 0 前加入

mkdir /var/lock/subsys

service keepalived start

15.启动keepalived：

service keepalived start

16.验证，执行

ip addr show

在eth0 中会显示192.168.117.111  ip

参考过的文章：

https://www.cnblogs.com/phpstudy2015-6/p/6706465.html
https://www.cnblogs.com/kevingrace/p/6710136.html
https://www.cnblogs.com/cutemsyu/p/6019420.html
https://www.cnblogs.com/linjiqin/p/8073468.html