The NAT model experiment of LVS

Three virtual machines to do LVS load balancing experiment, VM01 is load balancer, VM02 and vm03 are real Web servers, their relationship

Vm01

eth0:192.168.1.200

eth1:192.168.87.140 (where the 192.168.87.0 network segment can be connected to the extranet)

vip:192.168.87.30

Vm02

eth1:192.168.1.201 (gateway:192.168.1.200)

Vm03

eth1:192.168.1.202 (gateway:192.168.1.200)

First, Load balancer installation

Ipvs is the foundation of the entire load balancing, and without this foundation, fault isolation and failover are meaningless

[Root@vm01 ~]# Yum install-y ipvsadm

[Root@vm01 ~]# lsmod |grep Ip_vs

[Root@vm01 ~]# modprobe Ip_vs

[Root@vm01 ~]# lsmod |grep Ip_vs

Ip_vs 122241 0

It is not up to the process to judge if the Ip_vs module is loaded, because here is a command and no process is generated.

Second, create the Lvsnat mode startup script

Ipvsadm's Command reference:

-a--add-service adds a new virtual server record to the kernel's Virtual server table. Also

is to add a new virtual server.

-e--edit-service Edit a virtual server record in the Kernel Virtual server table.

-D--delete-service Deletes a virtual server record from the kernel Virtual server table.

-C--clear clears all records in the kernel Virtual server table.

-R--restore Restore virtual Server rules

-S--save save virtual Server rules, output to the-r option readable format

-a--add-server adds a new real server to a record in the Kernel Virtual server table

Recording. That is, adding a new real server to a virtual server

-e--edit-server edit a real server record in a virtual server record

-D--delete-server Deletes a real server record from a virtual server record

-l|-l--list display kernel Virtual server table

-Z--zero Virtual Service Table counter clear 0 (empty current number of connections, etc.)

--set TCP tcpfin UDP set Connection timeout value

--start-daemon initiates the synchronization daemon. He could be master or backup, for example.

Ming LVs Router is master or backup. You can also use keepalived in this function.

VRRP function.

--stop-daemon Stop the synchronization daemon

-H--help Display Help information

Other options:

-T--tcp-service service-address indicates that the virtual server provides TCP services

[Vip:port] or [Real-server-ip:port]

-U--udp-service service-address indicates that the virtual server provides UDP services

[Vip:port] or [Real-server-ip:port]

-F--fwmark-service fwmark description is a service type that has been iptables marked.

-S--scheduler Scheduler uses a scheduling algorithm that has several options

RR|WRR|LC|WLC|LBLC|LBLCR|DH|SH|SED|NQ,

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/Servers/virtualization/