How to Use KeepAlived in Centos 7

 

Install KeepAlived

Set Linux Kernel parameters as follows to support Floating IP

Configure keepalived setting

Add and configure the script like this (For Master)

! Configuration File for keepalived

global_defs {

   notification_email {

  root@webserver-01.centlinux.com

   }

   notification_email_from root@webserver-01.centlinux.com

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

    state MASTER

    interface enp0s3

    virtual_router_id 51

    priority 101 #used in election, 101 for master & 100 or less for backup

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.16.132/24

    }

}

Add and configure the script like this (For Backup)

! Configuration File for keepalived

global_defs {

   notification_email {

  root@webserver-02.centlinux.com

   }

   notification_email_from root@webserver-02.centlinux.com

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

    state BACKUP

    interface enp0s3

    virtual_router_id 51

    priority 100 #used in election, 101 for master & 100 or less for backup

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.16.132/24

    }

}

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