Lvs-nat based on NFS storage deployment Discuz

LVS (Linux virtual Server): Linux virtualization server. It is mainly used for load balancing scenarios, to solve the pressure of single node server, and improve the disaster tolerant ability.

LVS according to the way of implementation is divided into: Lvs-nat, LVS-DR, Lvs-tun, Lvs-fullnat

Lvs-nat Features:

1. The dispatcher director configures the dual network card, one piece configures the external network IP as the VIP, the other one NIC is the dip, must and the back end server Rs's rip in the same network, and the Rip Gateway must point to the dip

2. Request messages and response messages are passed through the director, so the director may become a bottleneck if under high load conditions

3. The client does not know the backend host when requesting the resource, so it can hide the backend server and prevent the attack.

The scene of this experiment is to use the Lvs-nat model to build a discuz, a total of four hosts, a LVS host to provide load balancing, two lamp host provides access, an NFS provides remote Storage

Lvs-nat Server	LAMP1 Server	LAMP2 Server	Server for NFS
dip:192.18.254.122	Rip1:192.18.254.123	rip2:192.18.254.124	192.18.254.125
vip:172.18.254.122

Host 4: As Server for NFS

1. Start the NFS service

Systemctl Start Nfs.service

2. Create a directory dedicated to remote sharing

Mkdir/web/html

3. Define a host that can access this NFS

vim/etc/exports/web/html 192.18.254.123 (rw), 192.18.254.124 (rw)

4. Re-export the file system

Exports-r

5. Create a user and specify the UID number

Useradd-u Web

6. Modify user permissions so that users can work with the directory

Setfacl-m u:web:rwx/web/html

Host 3: As an HTTP PHP MySQL server

1. Create a directory to mount NFS specifically

Mkdir/hm/html

2. Create a user with the same ID as the NFS server

Useradd-u Web

3. Mount remote NFS to local

Mount-t NFS 192.18.254.125:/web/html

4. Check that the mount status is normal

Mount

5 Installing HTTP PHP mysql

Yum-y Install http PHP php-mysql mariadb

6. Modify the configuration in the http.conf

ServerName www.discuz.com:80DocumentRoot "/hm/html"

7. Start the HTTPD service

Systemctl Start Httpd.service

8. Create a index.html in/hm/html and write some characters

echo "httpd test" >/hm/html

9. Start the database

Systemctl Start Mariadb.service mysql_secure_installation

9. Enter database with root user and password to create Discuz database, Telnet host

Mysql-uroot-p CREATE DATABASE Disdb; GRANT all on disdb.* to ' Disuser ' @192.18.%.% identified by ' dis '; FLUSH privileges;

10. Test if PHP can connect to mariadb. The Index.index in the/hm/html/directory is index.php

<?php $conn =mysql_connect (' 172.18.254.124 ', ' disuser ', ' dis ');        if ($conn) echo "OK"; else echo "failure";? >

11. Login Browser Enter hostname to see if it is OK

12. Download Discuz to/hm/html/dis directory, unzip and create the connection

Unzip Discuz_x3.2_sc_utf8.zip

13. Enter/hm/html/dis/upload/config to modify config_global_default.php

Vim config_global_default.php

Modify one of the Dbhost dbuser DBPW diname

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/80/36/wKiom1c7KFGBTbFNAAAhItwG2oE470.png "title=" Lvs-nat experiment. PNG "alt=" Wkiom1c7kfgbtbfnaaahitwg2oe470.png "/>

14. Modify the data Uc_server under Config

chmod 777 Datachmod 777 Uc_server

15. Start the browser type Www.discuz.com/dis step-by-step installation is complete.

16. Modify DocumentRoot

DocumentRoot "/hm/html/dis"

Host 2 configuration and host 3 are basically consistent

Host 1:lvs Server

1. Installing Ipvsadm

Yum-y Install Ipvsadm

2. Add a forwarding Rule

Ipvsadm-a-T 172.18.254.122:80-s rripvsadm-a-T 192.18.254.122:80-r 192.18.254.123:80-mipvsadm-a-T 192.18.254.122:8 0-r 192.18.254.124:80-m

3. View the LVS rules table

Ipvsadm-ln

4. Turn on the route forwarding function

Vim/etc/sysctlnet.ipv4.ip_forward = 1 Sysctl-p

5. See if the firewall and SELinux are turned off

IPTABLES-NVL Getenforce

6. Open the browser and type 172.18.254.122

Attention:

1. In the process of testing LVS, you can put different contents in the index.php of two lamp documetroot to see if the load balancing is based on RR.

The director in 2.lvs-nat needs to turn on the route forwarding feature.

The 3.NFS server needs to grant the corresponding host to mount the corresponding directory, and the client must have an account with the same UID as the NFS service.

Lvs-nat based on NFS storage deployment Discuz