Rhel6-keepalived+lvs配置文档

系统环境: rhel6 x86_64 iptables and selinux disabled

主机: 192.168.122.119 server19.example.com

192.168.122.25 server25.example.com

192.168.122.163 server63.example.com

192.168.122.193 server93.example.com

所需的包:keepalived-1.2.7.tar.gz

Realserver1
192.168.122.163:apache

Realserver2
192.168.122.193:apache

Load
Balance 192.168.122.119:keepalived

Load
Balance 192.168.122.25:keepalived

Virtual
IP 192.168.122.178

以下步骤在server19和server25上实施:

[root@server19
~]# yum install kernel-devel make gcc -y

[root@server19
~]# yum install openssl-devel popt-devel -y

[root@server19
~]# yum install libnl-devel -y

以下步骤在server19或server25上实施:

[root@server19
kernel]# tar zxf keepalived-1.2.7.tar.gz

[root@server19
kernel]# cd keepalived-1.2.7

[root@server19
keepalived-1.2.7]# ./configure –prefix=/usr/local/keepalived

[root@server19
keepalived-1.2.7]# make && make install

[root@server19
keepalived-1.2.7]# scp -r /usr/local/keepalived/
root@192.168.122.25:/usr/local/

以下步骤在server19和server25上实施:

[root@server19
keepalived-1.2.7]# ln -s /usr/local/keepalived/etc/keepalived/ /etc/

[root@server19
keepalived-1.2.7]# ln -s
/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

[root@server19
keepalived-1.2.7]# ln -s
/usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

[root@server19
keepalived-1.2.7]# ln -s /usr/local/keepalived/sbin/keepalived
/sbin/

注：系统镜像的负载均衡套件中也集成了keepalived,也可以直接使用yum
install keepalived -y进行安装。但需先配置yum源：

[LoadBalancer]

name=Instructor
Server Repository

baseurl=ftp://192.168.122.1/pub/yum/LoadBalancer

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

enabled=1

以下步骤在server19实施:

[root@server19
~]# vim /etc/keepalived/keepalived.conf

global_defs
{

notification_email {

root@localhost 错误发送至此邮箱

}

notification_email_from keepalived@server19.example.com
发信人

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance
VI_1 {

state MASTER 角色:(1)MASTER
(2)BACKUP

interface eth0

virtual_router_id 51 (主备的配置需要一致)

priority 100 优先级（数字越大，优先级越高）

advert_int 1

authentication {

auth_type PASS 认证类型

auth_pass 1111 认证密码

}

virtual_ipaddress {

192.168.122.178 虚拟IP，可设置多个

}

}

virtual_server
192.168.122.178 80 {

delay_loop 6

lb_algo rr

lb_kind DR

#
nat_mask 255.255.255.0

#
persistence_timeout 50

protocol TCP

real_server 192.168.122.163 80 {

weight 1

TCP_CHECK {
(注:TCP_CHECK和大括号之间要有空格)

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.122.193 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

以下步骤在server25实施:

[root@server25
~]# vim /etc/keepalived/keepalived.conf

global_defs
{

notification_email {

root@localhost 错误发送至此邮箱

}

notification_email_from keepalived@server25.example.com
发信人

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance
VI_1 {

state BACKUP 角色:(1)MASTER
(2)BACKUP

interface eth0

virtual_router_id 51 (主备的配置需要一致)

priority 50 优先级（数字越大，优先级越高）

advert_int 1

authentication {

auth_type PASS 认证类型

auth_pass 1111 认证密码

}

virtual_ipaddress {

192.168.122.178 虚拟IP，可设置多个

}

}

virtual_server
192.168.122.178 80 {

delay_loop 6

lb_algo rr

lb_kind DR

#
nat_mask 255.255.255.0

#
persistence_timeout 50

protocol TCP

real_server 192.168.122.163 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.122.193 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

以下步骤在server63上实施:

[root@server63
~]# yum install arptables_jf httpd -y

[root@server63
~]# arptables -A IN -d 192.168.122.178 -j DROP

[root@server63
~]# arptables -A OUT -s 192.168.122.178 -j mangle --mangle-ip-s
192.168.122.163

[root@server63
~]# /etc/init.d/arptables_jf save

[root@server63
~]# ifconfig eth0:0 192.168.122.178 netmask 255.255.255.255 up

或

[root@server63
~]# ip addr add 192.168.122.178 dev eth0

注：可用ip
addr show查看

[root@server63
~]# echo `hostname` > /var/www/html/index.html

[root@server63
~]# /etc/init.d/httpd start

以下步骤在server93上实施:

[root@server93
~]# yum install arptables_jf httpd -y

[root@server93
~]# arptables -A IN -d 192.168.122.178 -j DROP

[root@server93
~]# arptables -A OUT -s 192.168.122.178 -j mangle --mangle-ip-s
192.168.122.193

[root@server93
~]# /etc/init.d/arptables_jf save

[root@server93
~]# ifconfig eth0:0 192.168.122.178 netmask 255.255.255.255 up

或

[root@server93
~]# ip addr add 192.168.122.178 dev eth0

注：可用ip
addr show查看

[root@server93
~]# echo `hostname` > /var/www/html/index.html

[root@server93
~]# /etc/init.d/httpd start

以下步骤在server19和server25上实施:

[root@server19
~]# /etc/init.d/keepalived start

测试:

执行ip
addr show可查看虚拟IP,执行ipvsadm
-l查看规则是否加载，访问192.168.122.178反复刷新网页,每次出现的页面都不同说明配置成功.
当主备挂掉后可由另一台接管,当两台都正常时由Master充当调度器.

#配置多个服务（apache+ftp）

以下步骤在server19实施:

[root@server19
~]# vim /etc/keepalived/keepalived.conf

global_defs
{

notification_email {

root@localhost

}

notification_email_from keepalived@server19.example.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance
VI_1 {

state MASTER

interface eth0

virtual_router_id 51 (主备的配置需要一致)

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.122.178 虚拟IP，可设置多个

}

}

virtual_server
192.168.122.178 80 {

delay_loop 6

lb_algo rr

lb_kind DR

#
nat_mask 255.255.255.0

#
persistence_timeout 50

protocol TCP

real_server 192.168.122.163 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.122.193 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

virtual_server
192.168.122.178 21 {

delay_loop 6

lb_algo rr

lb_kind DR

#
nat_mask 255.255.255.0

persistence_timeout 50 持续连接时间为50s

protocol TCP

real_server 192.168.122.163 21 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.122.193 21 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

以下步骤在server25实施:

[root@server25
~]# vim /etc/keepalived/keepalived.conf

global_defs
{

notification_email {

root@localhost

}

notification_email_from keepalived@server25.example.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance
VI_1 {

state BACKUP

interface eth0

virtual_router_id 51 (主备的配置需要一致)

priority

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.122.178 虚拟IP，可设置多个

}

}

virtual_server
192.168.122.178 80 {

delay_loop 6

lb_algo rr

lb_kind DR

#
nat_mask 255.255.255.0

#
persistence_timeout 50

protocol TCP

real_server 192.168.122.163 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.122.193 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

virtual_server
192.168.122.178 21
{

delay_loop 6

lb_algo rr

lb_kind DR

#
nat_mask 255.255.255.0

persistence_timeout 50

protocol TCP

real_server 192.168.122.163 21 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.122.193 21 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

以下步骤在server63上实施:

[root@server63
~]# yum install arptables_jf httpd vsftpd -y

[root@server63
~]# arptables -A IN -d 192.168.122.178 -j DROP

[root@server63
~]# arptables -A OUT -s 192.168.122.178 -j mangle --mangle-ip-s
192.168.122.163

[root@server63
~]# /etc/init.d/arptables_jf save

[root@server63
~]# ifconfig eth0:0 192.168.122.178 netmask 255.255.255.255 up

或

[root@server63
~]# ip addr add 192.168.122.178 dev eth0

注：可用ip
addr show查看

[root@server63
~]# echo `hostname` > /var/www/html/index.html

[root@server63
~]# /etc/init.d/httpd start

[root@server63
~]# touch /var/ftp/server63

[root@server63
~]# /etc/init.d/vsftpd start

以下步骤在server93上实施:

[root@server93
~]# yum install arptables_jf httpd vsftpd -y

[root@server93
~]# arptables -A IN -d 192.168.122.178 -j DROP

[root@server93
~]# arptables -A OUT -s 192.168.122.178 -j mangle --mangle-ip-s
192.168.122.193

[root@server93
~]# /etc/init.d/arptables_jf save

[root@server93
~]# ifconfig eth0:0 192.168.122.178 netmask 255.255.255.255 up

或

[root@server93
~]# ip addr add 192.168.122.178 dev eth0

注：可用ip
addr show查看

[root@server93
~]# echo `hostname` > /var/www/html/index.html

[root@server93
~]# /etc/init.d/httpd start

[root@server93
~]# touch /var/ftp/server93

[root@server93
~]# /etc/init.d/vsftpd start

以下步骤在server19和server25上实施:

[root@server19
~]# /etc/init.d/keepalived start