LVS-DR + Keepalived Web Server dual-host hot standby configuration

LVS-DR + Keepalived Web Server dual-host hot standby configuration

Keepalived is a software similar to the layer3, 4 & 7 switching mechanism, that is, layer 3rd, layer 4th, and layer 7th switching. Keepalived is automatically completed without manual interference.

Scheduling Server:
It must be done on the basis of LVS.

Reference https://www.bkjia.com/Linux/2018-03/151514.htm

One Network Card:
Vmnet1: 192.168.80.100
The master and slave schedulers perform the following three steps: loading and installing the ipvsadm package
: Http://www.keepalived.org/download.html
[Root @ lss ~] # Modprobe ip_vs
[Root @ lss ~] # Rpm-ivh/mnt/Packages/ipvsadm-1.27-7.el7.x86_64.rpm
--------- Keepalived installation configuration (master and slave must be configured )----
[Root @ lss ~] # Yum-y install popt-devel kernel-devel openssl-devel
WinSCP uploads keepalived to the Master/Slave Server

[Root @ lss ~] # Tar fx keepalived-1.4.2.tar.gz-C/opt
[Root @ lss opt] # cd/opt/keepalived-1.4.2/
[Root @ lss keepalived-1.4.2] # yum-y install \
Gcc \
Gcc-c ++ \
Make
[Root @ lss keepalived-1.4.2] #./configure -- prefix =/
[Root @ lss keepalived-1.4.2] # make & make install
[Root @ lss keepalived] # cp-r/opt/keepalived-1.4.2/keepalived/etc/init. d
[Root @ lss keepalived] # systemctl enable keepalived
------------------------------ Modify the configuration file (Master Scheduler )-------------
[Root @ lss keepalived] # vi/etc/keepalived. conf
! Configuration File for keepalived
Global_defs {
Icationication_email {br/> acassen@firewall.loc
Failover@firewall.locbr> sysadmin@firewall.loc
}
Notification_email_from Alexandre.Cassen@firewall.loc
Smtp_server 192.168.200.1
Smtp_connect_timeout 30
Router_id LVS_01
}

Vrrp_instance VI_1 {
State MASTER
Interface ens33
Virtual_router_id 51
Priority110
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 6666
}
Virtual_ipaddress {
192.168.80.188
}
}
Virtual_server 192.168.80.188 80 {
Delay_loop 6
Lb_algo rr
Lb_kind DR
Persistence_timeout 60
Protocol TCP
Real_server 192.168.80.101 80 {
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 3
}
}
Real_server 192.168.80.102 80 {
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 3
}
}
}
[Root @ lss keepalived] # service keepalived start
[Root @ lss keepalived] # ip addr show dev ens33 // verify that the virtual address is bound
Inet 192.168.80.188/32 scope global ens33
[Root @ lss keepalived] # ipvsadm-L
[Root @ lss keepalived] # tail-f/var/log/messages // disable the Service server and the master scheduler to verify the hot backup and health check results.
The master state indicates the MASTER server.
Backup state indicates the BACKUP server

--------------------------------- Modify the configuration file (slave Scheduler )-----------------
[Root @ LSS03 ~] # Modprobe ip_vs
[Root @ LSS03 ~] # Rpm-ivh/mnt/Packages/ipvsadm-1.27-7.el7.x86_64.rpm
[Root @ LSS03 ~] # Yum-y install \
Gcc \
Gcc-c ++ \
Make
[Root @ LSS03 ~] # Tar fx keepalived-1.4.2.tar.gz-C/opt
[Root @ LSS03 ~] # Keepalived-1.4.2/cd/opt/
[Root @ LSS03 keepalived-1.4.2] #./configure -- prefix =/
[Root @ LSS03 keepalived-1.4.2] # make & make install
[Root @ LSS03 keepalived-1.4.2] # cp-r keepalived/etc/init. d/keepalived/etc/init. d/
[Root @ LSS03 keepalived-1.4.2] # systemctl enable keepalived
[Root @ LSS03 keepalived-1.4.2] # vi/etc/keepalived. conf
! Configuration File for keepalived

Global_defs {
Notification_email {
Root@localhost.localdomain
}
Notification_email_from benet root@localhost.localdomain
Smtp_server 127.0.0.1
Smtp_connect_timeout 30
Router_id LVS_02 // Master/Slave is not the same
}

Vrrp_instance VI_1 {
State BACKUP // hot standby status of the slave Scheduler
Interface ens33
Virtual_router_id 51 // number. Both sides of the master and slave must be the same
Priority 105 // priority of the slave Scheduler
Advert_int 1
Authentication {// Master/Slave Hot Standby authentication information
Auth_type PASS
Auth_pass 6666
}
Virtual_ipaddress {// specify the cluster VIP address (virtual server address). You can specify multiple
192.168.80.188
}
}

Virtual_server 192.168.80.188 80 {// virtual server address (VIP), Port
Delay_loop 6 // the Health Check Interval (in seconds.
Lb_algo rr // round robin (rr) Scheduling Algorithm
Lb_kind DR // direct routing (DR) Cluster Working Mode
Persistence_timeout 60 // connection persistence time (seconds). If you comment out the value, add "! "Requests from the same client are processed by the same server during this time.
Protocol TCP // The Application Service uses the TCP protocol.

Real_server 192.168.80.101 80 {// address and port of the first web Node
Weight 1 // node weight
TCP_CHECK {// Health Check Method
Connect_port 80 // check the target port
Connect_timeout 3 // connection timeout (seconds)
Nb_get_retry 3 // Number of Retries
Delay_before_retry 3 // Retry Interval (seconds)
}
}
Real_server 192.168.80.102 80 {// address and port of the second web Node
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 3
}
}
}
# Service keepalived start
[Root @ LSS03 keepalived-1.4.2] # ip addr show dev ens33
[Root @ LSS03 keepalived-1.4.2] # tail-f/var/log/messages
The master state indicates the MASTER server.
Backup state indicates the BACKUP server

The following are WEB servers:
192.168.80.101 Server:
[Root @ lss01 ~] # Yum install-y httpd
[Root @ lss01 ~] # Vi/etc/httpd/conf/httpd. confServerName www.aa.com
[Root @ lss01 ~] # Vi/var/www/html/index.html
<H1> Server aa

192.168.80.102 Server:
[Root @ lss02 ~] # Yum install-y httpd
[Root @ lss02 ~] # Vi/etc/httpd/conf/httpd. conf
ServerName www.bb.com
[Root @ lss02 ~] # Vi/var/www/html/index.html
<H1> Server bb

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