LVS Server2

[Linux/CentOS7] Install LVS + Keepalived Server #2

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This is the Redundant configuration for LVS + Keepalived Server itself.

This example is based on the environment below.

HTTP packets to the eth0 on LVS Server are forwarded to Backend01 and Backend02 Servers with NAT.

Change the default gateway to internal IP address of LVS on both Backend Web Servers first. (it's 10.0.0.29 on the example)

1. Install ipvsadm and keepalived.

[root@otaec ~]# yum -y install ipvsadm keepalived

# enable IP forward

[root@otaec ~]# echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf 

[root@otaec ~]# sysctl -p

[root@otaec ~]# touch /etc/sysconfig/ipvsadm 

[root@otaec ~]# systemctl start ipvsadm 

[root@otaec ~]# systemctl enable ipvsadm 

2. Configure Keepalived.

It's OK to configure the same settings except one setting on both backend servers. 

(but only for the "priority" section, Change it on both backend server.)

[root@otaec ~]# mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.org 

[root@otaec ~]# vi /etc/keepalived/keepalived.conf

# create new

global_defs {

    notification_email {

        root@otaec.server.world

    }

    notification_email_from root@otaec.server.world

    smtp_server 127.0.0.1

    smtp_connect_timeout 30

    router_id LVS_Server

}

vrrp_instance VI_1 {

    state BACKUP

    # monitored interface

    interface eth0

    # virtual router's ID

    virtual_router_id 51

    # set priority (change this value on each server)

    # (large number means priority is high)

    priority 100

    nopreempt

    # VRRP sending interval

    advert_int 1

    # authentication info between Keepalived servers

    authentication {

        auth_type PASS

        auth_pass password

    }

    virtual_ipaddress {

        # virtual IP address

        192.168.0.29 dev eth0

        10.0.0.29/24 dev eth1

    }

}

virtual_server 192.168.0.29 80 {

    # monitored interval

    delay_loop 3

    # distribution method

    lvs_sched rr

    # routing method

    lvs_method NAT

    protocol TCP

    # backend server#1

    real_server 10.0.0.51 80 {

        weight 1

        HTTP_GET {

            url {

                # monitored path

                path /

                # status code for normally state

                status_code 200

            }

            # timeout(sec)

            connect_timeout 3

        }

    }

    # backend server#2

    real_server 10.0.0.52 80 {

        weight 1

        HTTP_GET {

            url {

                path /

                status_code 200

            }

            connect_timeout 3

        }

    }

}

[root@otaec ~]# systemctl start keepalived 

[root@otaec ~]# systemctl enable keepalived 

[Linux/CentOS7] Install LVS + Keepalived Server #2