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LVS-DR+keepalived实现负载均衡

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LVS-DR+keepalived实现负载均衡

配置环境：

名称 主机名 IP地址 网关 需要的安装软件 VIP地址
LVS 主调度器 cdh1 192.168.10.34 192.168.10.254 ipvsadm+keepalived 192.168.10.29
LVS 从调度器 cdh2 192.168.10.35 192.168.10.254 ipvsadm+keepalived 192.168.10.29
realserver1 cdh6 192.168.10.39 192.168.10.254 httpd或nginx 192.168.10.29
realserver2 cdh7 192.168.10.41 192.168.10.254 httpd或nginx 192.168.10.29

一、LVS（主调度器）

安装ipvsadm

[root@cdh1 ~]#  yum -y install ipvsadm

安装keepalived的依赖包

[root@cdh1 ~]# yum -y install gcc openssl-devel libnfnetlink-devel libnl libnl3-devel

源码安装keepalived，keepalived下载地址：https://www.keepalived.org/download.html，下载完成后上传到主调度器和从调度器

[root@cdh1 ~]# tar zxf keepalived-1.4.5.tar.gz -C /usr/local/src/

[root@cdh1 ~]# cd /usr/local/src/keepalived-1.4.5/

[root@cdh1 ~]# ./configure --prefix=/usr/local/keepalived

[root@cdh1 ~]# make && make install

[root@cdh1 ~]# echo $?

生成启动脚本文件

[root@cdh1 keepalived-1.4.5]# cp keepalived/etc/init.d/keepalived /etc/init.d/

[root@cdh1 keepalived-1.4.5]# vim /etc/init.d/keepalived

. /usr/local/keepalived/etc/sysconfig/keepalived　　//第15行

[root@cdh1 keepalived-1.4.5]# chmod +x /etc/init.d/keepalived

//做一个软链接给启动脚本文件使用 [root@cdh1 keepalived-1.4.5]# ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/ [root@cdh1 keepalived-1.4.5]# vim /usr/local/keepalived/etc/sysconfig/keepalived　　//修改参数文件 KEEPALIVED_OPTIONS="-D -f /usr/local/keepalived/etc/keepalived/keepalived.conf"　　//指向配置文件

[root@cdh1 keepalived-1.4.5]# vim /usr/local/keepalived/etc/keepalived/keepalived.conf

! Configuration File for keepalived global_defs { 　　#邮件功能一般没用    notification_email {　　#指定当keepalived出现问题时，发送邮件给哪些用户    root@localhost    }    notification_email_from root@localhost　　#指定发件人    smtp_server localhost　　#指定SMTP服务器地址    smtp_connect_timeout 30　　#指定SMTP连接超时时间    router_id youxi1　　#标识当前节点名称，不允许重复 } vrrp_instance VI_5 {　　#定义一个实例，一个实例就是一个集群，实例名称VI_1可以更改     state MASTER　　#指定该节点为主节点     interface ens192　　#指定VIP的网络接口     virtual_router_id 101　　#指定VRRP组名，主节点和备用节点需要配置相同VRRP组名     priority 100　　#优先级，范围1~254，数学数值比较，越大优先级越高。主节点优先级必须高于备用节点     advert_int 1　　#组播信息发送间隔，单位秒，主节点备用节点必须设置一致     authentication {　　#设置验证信息，主节点备用节点必须设置一致         auth_type PASS　　#指定认证方法，PASS简单密码认证         auth_pass 1111　　#指定认证所使用的密码，最多8位     }     virtual_ipaddress {　　#指定VIP，主节点备用节点必须一致         192.168.10.29/24     } }   virtual_server 192.168.10.29 80 {　　#对VIP为192.168.10.29，端口号为80的服务器添加相关信息     delay_loop 6　　#keepalived多长时间监测一次真实服务器，单位秒     lb_algo rr　　#LVS调度算法     lb_kind DR　　#LVS-DR模式                nat_mask 255.255.255.0        persistence_timeout 50　　#同一个IP50秒内的请求都会发到同一个真实服务器，会影响rr算法调度，测试时可以注释掉     protocol TCP　　#4层协议       real_server 192.168.10.38 80 {　　#对IP为192.168.10.39，端口号为80的真实服务器添加相关信息         weight 1　　#指定权重，默认为1         TCP_CHECK{             connect_timeout 3　　#连接超时时间，默认5秒             nb_get_retry 3　　#重试次数，默认1次             delay_before_retry 3　　#重试时间间隔，默认1秒             connect_port 80　　#监测端口号         }     }     real_server 192.168.10.41 80 {　　#对IP为192.168.10.41，端口号为80的真实服务器添加相关信息         weight 1         TCP_CHECK{             connect_timeout 3             nb_get_retry 3             delay_before_retry 3             connect_port 80         }     } }   启动keepalived，并设置开机自启 [root@cdh1 keepalived-1.4.5]# keepalived-1.4.5]# systemctl start keepalived.service [root@cdh1 keepalived-1.4.5]# keepalived-1.4.5]# systemctl enable keepalived.service Created symlink from /etc/systemd/system/multi-user.target.wants/keepalived.service to /usr/lib/systemd/system/keepalived.service. [root@cdh1 keepalived-1.4.5]# keepalived-1.4.5]# systemctl status keepalived.service   如果防火墙是开启状态，请添加端口号 [root@cdh1 keepalived-1.4.5]# firewall-cmd --permanent --zone=public --add-port=80/tcp && firewall-cmd --reload success success

二、LVS（从调度器）

配置与主调度器一样，只需要修改keepalived.conf中的几个地主。

router_id cdh1　　//修改

state BACKUP　　//修改

priority 90　　//修改

正常启动keepalived，并设置开机自启

[root@cdh1 keepalived-1.4.5]# systemctl start keepalived.service

[root@cdh1 keepalived-1.4.5]# systemctl enable keepalived.service Created symlink from /etc/systemd/system/multi-user.target.wants/keepalived.service to /usr/lib/systemd/system/keepalived.service.

防火墙如果是开启状态记得添加端口号。注意：备用节点比主节点多添加一个vrrp协议规则（如果是iptables，那么就是iptables -A INPUT -p VRRP -j ACCEPT）。

[root@cdh1 keepalived-1.4.5]# firewall-cmd --permanent --zone=public --add-protocol=vrrp

success [root@cdh1 keepalived-1.4.5]# firewall-cmd --permanent --zone=public --add-port=80/tcp && firewall-cmd --reload success success

测试VIP漂移

查看主节点和备用节点的ip地址

[root@cdh1 ~]# ip a s ens192

2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:10:93:7c brd ff:ff:ff:ff:ff:ff
inet 192.168.10.34/24 brd 192.168.10.255 scope global noprefixroute ens192
valid_lft forever preferred_lft forever
inet 192.168.10.29/32 scope global ens192
valid_lft forever preferred_lft forever
inet6 fe80::3418:ac4b:b2f9:4957/64 scope link noprefixroute
valid_lft forever preferred_lft forever

[root@cdh2 ~]# ip a s ens192
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:95:a7:6a brd ff:ff:ff:ff:ff:ff
inet 192.168.10.35/24 brd 192.168.10.255 scope global noprefixroute ens192
valid_lft forever preferred_lft forever
inet6 fe80::cc97:cbe0:9d14:917c/64 scope link noprefixroute
valid_lft forever preferred_lft forever

停止主节点的keepalived，再查看主节点和备用节点IP

[root@cdh1 ~]# systemctl stop keepalived.service

[root@cdh1 ~]# ip a s ens192
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:10:93:7c brd ff:ff:ff:ff:ff:ff
inet 192.168.10.34/24 brd 192.168.10.255 scope global noprefixroute ens192
valid_lft forever preferred_lft forever
inet6 fe80::3418:ac4b:b2f9:4957/64 scope link noprefixroute
valid_lft forever preferred_lft forever

[root@cdh2 ~]# ip a s ens192
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:95:a7:6a brd ff:ff:ff:ff:ff:ff
inet 192.168.10.35/24 brd 192.168.10.255 scope global noprefixroute ens192
valid_lft forever preferred_lft forever
inet 192.168.10.29/32 scope global ens192
valid_lft forever preferred_lft forever
inet6 fe80::cc97:cbe0:9d14:917c/64 scope link noprefixroute
valid_lft forever preferred_lft forever

测试完记得开启主调度器的keepalived

4、搭建真实服务器

配置回环口lo:1为VIP

[root@cdh6 ~]# cd /etc/sysconfig/network-scripts/

[root@cdh6 network-scripts]# cp ifcfg-lo{,:1} [root@cdh6 network-scripts]# vim ifcfg-lo:1 DEVICE=lo:1　　//修改 IPADDR=192.168.10.29　　//修改 NETMASK=255.255.255.255　　//修改 #iNETWORK=127.0.0.0　　//注释 # If you're having problems with gated making 127.0.0.0/8 a martian, # you can change this to something else (255.255.255.255, for example) #BROADCAST=127.255.255.255　　//注释 ONBOOT=yes NAME=loopback [root@cdh6 network-scripts]# systemctl restart network [root@cdh6 network-scripts]# ip a sh dev lo           1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00     inet 127.0.0.1/8 scope host lo        valid_lft forever preferred_lft forever     inet 192.168.5.100/32 brd 192.168.5.100 scope global lo:1        valid_lft forever preferred_lft forever     inet6 ::1/128 scope host        valid_lft forever preferred_lft forever

搭建一个简易的网页

[root@cdh6 network-scripts]# yum -y install httpd

[root@cdh6 network-scripts]# systemctl start httpd.service [root@cdh6 network-scripts]# systemctl enable httpd.service Created symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service. [root@cdh6 network-scripts]# echo cdh6 192.168.10.39 > /var/www/html/index.html 如果防火墙是开启状态，记得添加端口号

[root@@cdh6 ~]# firewall-cmd --permanent --zone=public --add-port=80/tcp && firewall-cmd --reload

success success

5、搭建真实服务器2

基本和搭建cdh6一样，只是index.html内容改为cdh7 192.168.10.41，方便测试。

6、测试

　　注释掉persistence_timeout参数，然后重启

 

三、创建LVS虚拟集群服务器(两台LVS调度器配置都一样)

[root@cdh1 ~]# ipvsadm -A -t 192.168.10.29:80 -s rr 

[root@cdh1 ~]# ipvsadm -a -t 192.168.10.29:80 -r 192.168.10.39 -g

[root@cdh1 ~]# ipvsadm -a -t 192.168.10.29:80 -r 192.168.10.41 -g

保存配置：

[root@cdh1 ~]# ipvsadm -S -n 

[root@cdh1 ~]# cat /etc/sysconfig/ipvsadm
-A -t 192.168.10.29:80 -s rr
-a -t 192.168.10.29:80 -r 192.168.10.39:80 -g -w 1
-a -t 192.168.10.29:80 -r 192.168.10.41:80 -g -w 1

 

配置两台LVS调度器的网络

[root@cdh1 ~]# ip addr add 192.168.10.29/24 dev ens192 label ens192:1

[root@cdh2 ~]# ip addr add 192.168.10.29/24 dev ens192 label ens192:1

也可以手动配置两台真实服务器的lo网络（上面步骤已经更改，此处可以忽略）

[root@cdh6 ~]#  ip addr add 192.168.10.29/32 dev lo label lo:1

[root@cdh6 ~]#  route add -host 192.168.10.29 dev lo （可省略）

[root@cdh7 ~]#  ip addr add 192.168.10.29/32 dev lo label lo:1

[root@cdh7 ~]#  route add -host 192.168.10.29 dev lo （可省略）

还有需要更改arp配置（两台真实服务器都需要改）

[root@cdh6 ~]# vim /etc/sysctl.conf

.. ..

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.lo.arp_ignore = 1

net.ipv4.conf.lo.arp_announce = 2

net.ipv4.conf.all.arp_announce = 2

刷新服务：

[root@cdh6 ~]#sysctl -p

整个过程搭建完成。

 

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