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The following brings you how to build a LVS-NAT load balancing cluster, hoping to give you some help in practical application. Load balancing involves a lot of things, and there are not many theories. There are many books on the Internet. Today, we will use the accumulated experience in the industry to do an answer.

Build LVS-NAT load balancer cluster experimental environment: host operating system IP address LVS load scheduler CentOS 7.3 x86164 inside: 192.168.1.100 outside: 12.0.0.1web CVM 1CentOS 7.3 x86_64192.168.1.101web server 2CentOS 7.3 x86_64192.168.1.102NFS shared storage CentOS 7.3 x86 address 64192.168.1.103 client Windows 712.0.0.12

Note: the LVS scheduler acts as a gateway server with two network cards.

Configure NFS to turn off the firewall, edit the configuration file: vim / etc/exports/opt/benet 192.168.1.0 rw,sync 24 (rw,sync) # read and write remote synchronization / opt/accp 192.168.1.0 max 24 (rw,sync)

Note: if a shared folder does not exist to be created, you can actually do a disk array mount in the shared folder.

Create a shared folder and add permissions for files: mkdir / opt/benet / opt/accp chmod 777 benet accp to enable the service Release sharing: systemctl start rpcbind.service # enable remote procedure call protocol systemctl start nfs.service # enable nfs service exportfs-rv # publish sharing showmount-e 192.168.1.103 # Test whether this machine is shared

Note: some systems may not have nfs-utils installed for NFS sharing publishing and access.

Configure web server to install httpd service Edit configuration file: vim / usr/local/apache/conf/httpd.conf Listen 192.168.1.101NFS 80 # modify IP ServerName www.yun.com:80 # change domain name mount file share provided by NFS: showmount-e 192.168.1.103 # check whether there is a shared file mount.nfs 192.168.1.103:/opt/benet / var/www/html # Mount the shared file provided by NFS to the httpd site and add a httpd home page Turn off the firewall: echo "this is benet" > / var/www/html/index.htmlsystemctl stop firewalld.service

Note: you can locally test whether the test home page can be opened. The two web servers have the same configuration and add different home pages to make a distinction.

Configure the LVS load scheduler to install dual network cards to serve as gateway servers. Enable route forwarding function: vim / etc/sysctl.conf net.ipv4.ip_forward=1 # add sysctl-p # load LVS template: modprobe ip_vs # load template cat / proc/net/ip_vs # View version information install management software, add server node Enable service: yum install ipvsadm-y ipvsadm-C # Clean server node ipvsadm-A-t 12.0.0.1 rr 80-s rr # add virtual server ipvsadm-a-t 12.0.0.1ipvsadm 80-r 192.168.1.101purge 80-mipvsadm-a-t 12.0.0.1ipvsadm 80-r 192.168.1.102 : 80-mipvsadm-- save > / etc/sysconfig/ipvsadm # Save policy (required to enable ipvsadm service above 7) ipvsadm-ln # View node status ipvsadm # enable service

Note:-An add virtual server,-s load scheduling algorithm, rr polling,-an add real server,-t specify virtual IP and TCP port,-r specify real IP and TCP port,-m use NAT cluster mode,-d delete

Set firewall rules: iptables-t nat-F # clear rules in nat table iptables-F # clear firewall default table rule chain iptables-t nat-A POSTROUTING-o ens34-s 192.168.1.0 to-source 24-j SNAT-- to-source 12.0.0.1

Note:-o Export network card 12.0.0.1 network card name

Test to open win access 12.0.0.1

Note: sometimes the refresh may not jump and the cache needs to be cleared.

After reading the above about how to build a LVS-NAT load balancing cluster, if you have 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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