Deploying the Load Balancing Node (LVS)

For details about how to use and deploy LVS, see LVS Deployment Guide. This section describes only the related settings.
LVS is deployed in DR mode. Ensure that the IP addresses of LVS and the backend real server (RS) (the server where Nginx and ATS are deployed) are in the same network segment so that they can communicate with each other without using a gateway. Ensure that the kernel modules related to ip_vs are successfully loaded to the Linux Virtual Server (LVS).

Check whether ip_vs is loaded to the kernel module.
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lsmod | grep ip_vs
If no command output is displayed, ip_vs is not loaded to the kernel module.

Configure the LVS service.

Specify the local virtual IP address, RS IP address, and port number.

Open the lvs_config.sh file.
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vim lvs_config.sh

Press i to enter the insert mode and add the following content to the file:

VIP=192.168.100.225
RS1=192.168.100.206
ipvsadm --save > /etc/sysconfig/ipvsadm
systemctl start ipvsadm
ifconfig enp3s0:0 $VIP  broadcast $VIP netmask 255.255.255.255 up
route add -host $VIP dev enp3s0:0
echo 1 > /proc/sys/net/ipv4/ip_forward
ipvsadm -C
ipvsadm -A -t ${VIP}:10001 -s lc
ipvsadm -a -t ${VIP}:10001 -r ${RS1}:10001 -g

Press Esc, type :wq!, and press Enter to save the file and exit.

Run the following script on LVS.
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sh lvs_config.sh
View the configuration.
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ipvsadm -Ln

Configure the RS (Nginx and ATS deployment server).

Open the rs_config.sh file.
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vim rs_config.sh

Press i to enter the insert mode and add the following content to the file:

VIP=192.168.100.225
ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce

Press Esc, type :wq!, and press Enter to save the file and exit.

Run the script on the RS.
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sh rs_config.sh

Parent topic: Component Deployment