Linux下群集服务之LB集群
O:\RHCA\群集_Cluster\Linux下群集服务之LB群集-lvs-nat模式.docxLinux下群集服务之lvs在企业网络中的应用案例
案例应用拓扑图：
http://blog.运维网.com/attachment/201205/083406420.png
案例应用实现详细步骤如下：
1. Client-pc客户端配置
http://blog.运维网.com/attachment/201205/083415976.png
http://blog.运维网.com/attachment/201205/083423567.png
2. Director服务器配置
2.1Director服务器ip地址配置
# vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=10.106.6.254
GATEWAY=10.106.6.1
# vim /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=192.168.1.1
# service network restart
Shutting down interface eth0:
Shutting down interface eth1:
Shutting down loopback interface:
Bringing up loopback interface:
Bringing up interface eth0:
Bringing up interface eth1:
# ifconfig eth0
eth0 Link encap:EthernetHWaddr 00:0C:29:66:E1:DA
inet addr:10.106.6.254Bcast:10.106.6.255Mask:255.255.255.0
# ifconfig eth1
eth1 Link encap:EthernetHWaddr 00:0C:29:66:E1:E4
inet addr:192.168.1.1Bcast:192.168.1.255Mask:255.255.255.0
# hostname director.junjie.com#注销重新登录
2.2开启director数据包转发能力
# vim /etc/sysctl.conf
7 net.ipv4.ip_forward = 1
# sysctl -p
net.ipv4.ip_forward = 1
2.3配置本地yum服务器：
# vim /etc/yum.repos.d/server.repo
name=Red Hat Enterprise Linux server
baseurl=file:///mnt/cdrom/Server/
enabled=1
gpgcheck=1
gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release
name=Red Hat Enterprise Linux cluster
baseurl=file:///mnt/cdrom/Cluster/
enabled=1
gpgcheck=1
gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release
#mkdir /mnt/cdrom
# mount /dev/cdrom /mnt/cdrom/
mount: block device /dev/cdrom is write-protected, mounting read-only
#yum list all
2.4安装配置dircetor服务器：
# yum install -y ipvsadm
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
# ipvsadm -A -t 10.106.6.254:80 -s wrr
# ipvsadm -a -t 10.106.6.254:80 -r 192.168.1.2 -m -w 1
# ipvsadm -a -t 10.106.6.254:80 -r 192.168.1.3 -m -w 2
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP10.106.6.254:80 wrr
-> 192.168.1.3:80 Masq 2 0 0
-> 192.168.1.2:80 Masq 1 0 0
http://blog.运维网.com/attachment/201205/083444840.png
# service ipvsadm save
Saving IPVS table to /etc/sysconfig/ipvsadm:
# service ipvsadm start
Clearing the current IPVS table:
Applying IPVS configuration:
3. 配置real-server-1的web服务器：
3.1 ip地址配置
# hostname r1.junjie.com
注销重新登录
# vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
HWADDR=00:0c:29:1b:f1:ba
NETMASK=255.255.255.0
IPADDR=192.168.1.2
GATEWAY=192.168.1.1
# service network restart
Shutting down interface eth0:
Shutting down loopback interface:
Bringing up loopback interface:
Bringing up interface eth0:
3.2 配置本地yum服务器：
# vim /etc/yum.repos.d/server.repo
name=Red Hat Enterprise Linux server
baseurl=file:///mnt/cdrom/Server/
enabled=1
gpgcheck=1
gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release
r1 ~]#mkdir /mnt/cdrom
# mount /dev/cdrom /mnt/cdrom/
mount: block device /dev/cdrom is write-protected, mounting read-only
#yum list all
3.3Real-server-1的Web服务器：
# rpm -ivh /mnt/cdrom/Server/httpd-2.2.3-31.el5.i386.rpm
warning: /mnt/cdrom/Server/httpd-2.2.3-31.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing... ####################################
1:httpd ###########################################
#echo "web1" > /var/www/html/index.html
# service httpd start
Starting httpd: httpd: apr_sockaddr_info_get() failed for r1.junjie.com
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
3.4 客户端访问real-server-1的web服务：（使用vmnet1）
http://blog.运维网.com/attachment/201205/083505763.png
4. 配置real-server2的web服务器：
4.1 ip地址配置
# hostname r2.junjie.com
注销重新登录
# vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
HWADDR=00:0c:29:1b:f1:ba
NETMASK=255.255.255.0
IPADDR=192.168.1.3
GATEWAY=192.168.1.1
# service network restart
Shutting down interface eth0:
Shutting down loopback interface:
Bringing up loopback interface:
Bringing up interface eth0:
4.2 配置本地yum服务器：
# vim /etc/yum.repos.d/server.repo
name=Red Hat Enterprise Linux server
baseurl=file:///mnt/cdrom/Server/
enabled=1
gpgcheck=1
gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release
#mkdir /mnt/cdrom
# mount /dev/cdrom /mnt/cdrom/
mount: block device /dev/cdrom is write-protected, mounting read-only
#yum list all
4.3Real-server-2的Web服务器：
# rpm -ivh /mnt/cdrom/Server/httpd-2.2.3-31.el5.i386.rpm
warning: /mnt/cdrom/Server/httpd-2.2.3-31.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing... ####################################
1:httpd ###########################################
#echo "web2" > /var/www/html/index.html
# service httpd start
Starting httpd: httpd: apr_sockaddr_info_get() failed for r2.junjie.vom
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
4.4 客户端访问real-server-2的web服务：（使用vmnet1）
http://blog.运维网.com/attachment/201205/083516683.png
5. 客户端测试：wrr
5.1客户端访问director的群集服务服务：（网卡使用桥接模式）http：//10.106.6.254
http://blog.运维网.com/attachment/201205/083527711.png
5.2 客户端不断刷新，发现出现2次web2，一次web1界面，说明按权重轮询
http://blog.运维网.com/attachment/201205/083536369.png
5.3在director上查看信息如下：轮询调度比几乎为2:1
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP10.106.6.254:80 wrr
-> 192.168.1.2:80 Masq 1 0 12
-> 192.168.1.3:80 Masq 2 0 24
5.4客户端测试-2：rr
# ipvsadm –C #首先清空以前配置
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
#ipvsadm -A -t 10.106.6.254:80 -s rr
# ipvsadm -a -t 10.106.6.254:80 -r 192.168.1.2 -m
# ipvsadm -a -t 10.106.6.254:80 -r 192.168.1.3 –m
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP10.106.6.254:80 rr
-> 192.168.1.3:80 Masq 1 0 0
-> 192.168.1.2:80 Masq 1 0 0
# service ipvsadm save
Saving IPVS table to /etc/sysconfig/ipvsadm:
# service ipvsadm restart
Clearing the current IPVS table:
Applying IPVS configuration:
客户端访问director的群集服务服务：（网卡使用桥接模式）http：//10.106.6.254
http://blog.运维网.com/attachment/201205/083551261.png
客户端不断刷新，发现web2和web1交替出现，比率为1:1，说明依次轮询rr
http://blog.运维网.com/attachment/201205/083605621.png
在director上查看信息如下：轮询调度比几乎为1:1；
说明lvs调度方法是用的是RR模式
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP10.106.6.254:80 rr
-> 192.168.1.2:80 Masq 1 0 15
-> 192.168.1.3:80 Masq 1 0 15
《完》
关于Linux下集群服务简介和lvs的详解请参看我的博客：
http://xjzhujunjie.blog.运维网.com/3582724/850650
--xjzhujunjie
--2012/05/03
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