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The following brings you how to configure the four-tier load balancing LVS/DR mode, hoping to give you some help in practical application. Load balancing involves more things, there are not many theories, and there are many books on the Internet. Today, we will use the accumulated experience in the industry to do an answer.

1. Environmental preparation

Prepare 3 pure virtual machines, two web cloud servers, and turn off all firewalls and selinux

2. Deployment instructions:

The network uses NAT mode

DR mode requires that Director DIP and all RealServer RIP must be in the same network segment and broadcast domain

All node gateways specify real gateways

3. LVS-server installs lvs management software

Yum-y install ipvsadm

4. The ipvsadm file needs to be generated manually or the startup will report an error.

[root@vm-2 ~] # ipvsadm-- save > / etc/sysconfig/ipvsadm launch: [root@vm-2 ~] # systemctl start ipvsadm

5. Configure ipvsadm:

[root@vm-2 ~] # ip addr add dev ens33 10.30.161.200 VIP 32 set up VIP [root@vm-2 ~] # ipvsadm-A-t 10.30.161.200 ipvsadm 80-s rr-An add a VIP,-t using the tcp protocol -s rr uses rotational training algorithm to add ip forwarded to the real realserverip server: [root@vm-2 ~] # ipvsadm-a-t 10.30.161.200 ip 80-r 10.30.161.214 ipvsadm 80-g [root@vm-2 ~] # ipvsadm-a-t 10.30.161.200 ip 80-r 10.30.161.241 ip 80-g save: [root@vm-2 ~] # ipvsadm-S > / etc / sysconfig/ipvsadm View: [root@vm-2 ~] # ipvsadm-ln [root@vm-2 ~] # ipvsadm-ln-- stats displays statistics

6. Configure RS real server

[root@real-server1 ~] # yum install-y nginx [root@real-server1 ~] # echo "real-server1" > > / usr/share/nginx/html/index.html both machines are installed Add different hostnames in order to distinguish [root@vm-4 ~] # ip addr add dev lo 10.30.161.200 echo 32 # bind VIP [root@vm-4 ~] # echo 1 > / proc/sys/net/ipv4/conf/all/arp_ignore arp_ignore to the lo interface, which means that when someone else's ip request comes, if the receiving device does not have this ip, it will not respond (the ip is on the lo). Lo is not an import of receiving equipment) [root@vm-4 ~] # echo 2 > / proc/sys/net/ipv4/conf/all/arp_announce # match exact ip address return packet [root@vm-4 ~] # systemctl start nginx [root@vm-4 ~] # systemctl enable nginx

7. Testing

Curl 10.30.161.200 [root@localhost ~] # curl 10.30.161.200 server1 [root@localhost ~] # curl 10.30.161.200

Successful implementation of server2 load balancing

After reading the above about how to configure the layer-4 load balancer LVS/DR mode, if there is anything else you need to know, you can find out what you are interested in in the industry information or find our professional and technical engineers for answers. Technical engineers have more than ten years of experience in the industry.

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