Centos Keepalived-Ha集群+Lvs-DR+Nginx集群配置

背景介绍

我们都知道一台服务器能提供的资源是有限的，如果想打破这个限制，只有两个办法，一个是购买硬件，提升服务器性能，但是性价比过高，而第二种方法这则是，使用集群软件让两台服务器处理一个服务的不同请求，分带单台服务器的负载，从而提升性能，实现这一的软件开源著名的有Nginx或者Lvs，这里我们使用的是LVS，但是lvs需要一个调度服务器，这样调度服务器就是一个集训的单点故障，一旦调度服务器出现故障，整个集群便崩溃，所以我们需要两台调度节点，一旦一个调度节点损坏，那么另一台调度节点开始工作，这里我们使用Keepalived开源软件实现调度器的高可用。

逻辑图介绍

1.用户在访问Nginx的时候，先通过VIP访问Master1，由Master指定那个real-server提供服务

2.在Master通过lvs-Dr指定的算法选定由Nginx1来提供服务，那么数据在通过VIP发送到Nginx1上

3.Nginx处理完请求后，在通过自身的VIP将处理后的请求直接发送给User

注明：

如果Master出现故障，那么Baskup将替代Master工作

如果Nginx1出现故障，那么Nginx2将提点Nginx1工作

如果Nginx1没有出现故障，那么LVS服务使用算法会将请求平均到Nginx1和Nginx2上

如果两台Nginx同时出现故障，那么Master会提供Sorry Server服务

物理拓扑图及环境介绍

服务器：使用虚拟机虚拟4套服务器

操作系统：CentOS7.3

HA软件/LVs软件：keepalived

Web软件：Nginx

IP及主机名配置

VIP：172.18.17.30

Master：

主机名：shiyan7.one

IP地址：172.18.17.31

Backup

主机名：shiyan7.fore

IP地址：172.18.17.34

Nginx1

主机名：shiyan7.two

IP地址：172.18.17.34

Nginx2

主机名：shiyan7.thy

IP地址：172.18.17.34

4台服务器初始化配置

同步时间服务

#Master配置NTP服务器
[root@shiyan7~]#vim/etc/ntp.conf
restrict172.18.17.0mask255.255.0.0nomodifynotrap
server127.127.1.0
fudge127.1.1.0stratum8
[root@shiyan7~]#ntpdate172.18.17.31

关闭Selinux

[root@shiyan7~]#vim/etc/selinux/config
SELINUX=disabled

关闭防火墙

[root@shiyan7~]#systemctlstopfirewalld
[root@shiyan7~]#systemctldisablefirewalld
[root@shiyan7~]#iptables-F

主机名解析配置

[root@shiyan7~]#cat/etc/hosts
127.0.0.1localhostlocalhost.localdomainlocalhost4localhost4.localdomain4
::1localhostlocalhost.localdomainlocalhost6localhost6.localdomain6
172.18.17.34shiyan.fore
172.18.17.31shiyan.one
172.18.17.32shiyan7.two
172.18.17.33shiyan7.thy

Master/Backup初始化配置

安装KeepAlived、Nginx软件

[root@shiyan7~]#yuminstallkeepalivedNginxipvsadm

Nginx1/2初始化配置

安装Nginx软件

[root@shiyan7~]#yuminstallNginx
#这里配置一个配置VIP及更改内核参数的脚本。
[root@shiyan7~]#touchroush.sh
[root@shiyan7~]#chmod+xroush.sh
[root@shiyan7~]#vimroush.sh
#!/bin/bash
#

vip="172.18.17.30"
netmask="255.255.255.255"
iface="lo:0"

case$1in
start)
echo1>/proc/sys/net/ipv4/conf/all/arp_ignore
echo1>/proc/sys/net/ipv4/conf/lo/arp_ignore
echo2>/proc/sys/net/ipv4/conf/all/arp_announce
echo2>/proc/sys/net/ipv4/conf/lo/arp_announce
ifconfig$iface$vipnetmask$netmaskbroadcast$vipup
routeadd-host$vipdev$iface
;;
stop)
ifconfig$ifacedown
echo0>/proc/sys/net/ipv4/conf/all/arp_ignore
echo0>/proc/sys/net/ipv4/conf/lo/arp_ignore
echo0>/proc/sys/net/ipv4/conf/all/arp_announce
echo0>/proc/sys/net/ipv4/conf/lo/arp_announce
;;
esac

Ngxin1配置

[root@shiyan7~]#./roush.shstart
[root@shiyan7~]#mkdir/app/Nginx/html
[root@shiyan7~]#echo"<h1>RS1:172.18.17.32</h1>">/app/Nginx/html/index.html
[root@shiyan7~]#cp/etc/Nginx/Nginx/conf{,.bak}#备份原文件
[root@shiyan7~]#vim/etc/Nginx/Nginx/conf
server{
listen80default_server;
listen[::]:80default_server;
server_name_;
root/app/Nginx/html;#修改root这里的路径，其他不需要
#Loadconfigurationfilesforthedefaultserverblock.
include/etc/Nginx/default.d/*.conf;

location/{
}

error_page404/404.html;
location=/40x.html{
}

error_page500502503504/50x.html;

}
[root@shiyan7~]#systemctlstartNginx
#测试Nginx服务
[root@yum~]#curlhttp://172.18.17.33
<h1>RS1:172.18.17.33</h1>

Ngxin2配置

[root@shiyan7~]#./roush.shstart
[root@shiyan7~]#mkdir/app/Nginx/html
[root@shiyan7~]#echo"<h1>RS1:172.18.17.33</h1>">/app/Nginx/html/index.html
[root@shiyan7~]#cp/etc/Nginx/Nginx/conf{,.bak}#备份原文件
[root@shiyan7~]#vim/etc/Nginx/Nginx/conf
server{
listen80default_server;
listen[::]:80default_server;
server_name_;
root/app/Nginx/html;#修改root这里的路径，其他不需要
#Loadconfigurationfilesforthedefaultserverblock.
include/etc/Nginx/default.d/*.conf;

location/{
}

error_page404/404.html;
location=/40x.html{
}

error_page500502503504/50x.html;

}
[root@shiyan7~]#systemctlstartNginx
#测试Nginx服务
[root@yum~]#curlhttp://172.18.17.34
<h1>RS1:172.18.17.34</h1>

Master上的配置

#配置Nginx1-SorryServer
[root@shiyan7~]#mkdir/app/Nginx/html
[root@shiyan7~]#echo"Sorryserver-1">/app/Nginx/html/index.html
[root@shiyan7~]#cp/etc/Nginx/Nginx/conf{,.bak}#备份原文件
[root@shiyan7~]#vim/etc/Nginx/Nginx/conf
server{
listen80default_server;
listen[::]:80default_server;
server_name_;
root/app/Nginx/html;#修改root这里的路径，其他不需要
#Loadconfigurationfilesforthedefaultserverblock.
include/etc/Nginx/default.d/*.conf;

location/{
}

error_page404/404.html;
location=/40x.html{
}

error_page500502503504/50x.html;

}
[root@shiyan7~]#systemctlstartNginx
#测试Nginx1-SorryServer
[root@yum~]#curlhttp://172.18.17.31
Sorryserver-1

#配置Keepalived服务
[root@shiyan7~]#cp/etc/keepalived/keepalived.conf{,.bak}
[root@shiyan7~]#vim/etc/keepalived/keepalived.conf
vrrp_instanceHa_1{
stateMASTER
interfaceens33
virtual_router_id51
priority100
advert_int1
authentication{
auth_typePASS
auth_pass1111
}
virtual_ipaddress{
172.18.17.30/16devens33
}
}

virtual_server172.18.17.3080{
delay_loop6
lb_algolc
lb_kindDR
persistence_timeout50
protocolTCP
sorry_server172.18.17.3180

real_server172.18.17.3280{
weight1
HTTP_GET{
url{
path/
status_code200
}
connect_timeout3
nb_get_retry3
delay_before_retry3
}
}
real_server172.18.17.3380{
weight1
HTTP_GET{
url{
path/
status_code200
}
connect_timeout3
nb_get_retry3
delay_before_retry3
}
}
}
[root@shiyan7~]#systemctlstartkeepalived
#查看配置是否成功
[root@shiyan7~]#ipal
2:ens33:<BROADCAST,MULTICAST,UP,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000
link/ether00:0c:29:1b:f5:aebrdff:ff:ff:ff:ff:ff
inet172.18.17.31/16brd172.18.255.255scopeglobalens33
valid_lftforeverpreferred_lftforever
inet172.18.17.30/16scopeglobalsecondaryens33
valid_lftforeverpreferred_lftforever
[root@shiyan7~]#ipvsadm-ln
IPVirtualServerversion1.2.1(size=4096)
ProtLocalAddress:PortSchedulerFlags
->RemoteAddress:PortForwardWeightActiveConnInActConn
TCP172.18.17.30:80lcpersistent50
->172.18.17.32:80Route100
->172.18.17.33:80Route100

Backup上的配置

#配置Nginx1-SorryServer
[root@shiyan7~]#mkdir/app/Nginx/html
[root@shiyan7~]#echo"Sorryserver-2">/app/Nginx/html/index.html
[root@shiyan7~]#cp/etc/Nginx/Nginx/conf{,.bak}#备份原文件
[root@shiyan7~]#vim/etc/Nginx/Nginx/conf
server{
listen80default_server;
listen[::]:80default_server;
server_name_;
root/app/Nginx/html;#修改root这里的路径，其他不需要
#Loadconfigurationfilesforthedefaultserverblock.
include/etc/Nginx/default.d/*.conf;

location/{
}

error_page404/404.html;
location=/40x.html{
}

error_page500502503504/50x.html;

}
[root@shiyan7~]#systemctlstartNginx
#测试Nginx1-SorryServer
[root@yum~]#curlhttp://172.18.17.34
Sorryserver-2

#配置Keepalived服务
[root@shiyan7~]#cp/etc/keepalived/keepalived.conf{,.bak}
[root@shiyan7~]#vim/etc/keepalived/keepalived.conf
vrrp_instanceHa_1{
stateMASTER
interfaceens33
virtual_router_id51
priority100
advert_int1
authentication{
auth_typePASS
auth_pass1111
}
virtual_ipaddress{
172.18.17.30/16devens33
}
}

virtual_server172.18.17.3080{
delay_loop6
lb_algolc
lb_kindDR
persistence_timeout50
protocolTCP
sorry_server172.18.17.3280

real_server172.18.17.3280{
weight1
HTTP_GET{
url{
path/
status_code200
}
connect_timeout3
nb_get_retry3
delay_before_retry3
}
}
real_server172.18.17.3380{
weight1
HTTP_GET{
url{
path/
status_code200
}
connect_timeout3
nb_get_retry3
delay_before_retry3
}
}
}
[root@shiyan7~]#systemctlstartkeepalived
[root@shiyan7~]#ipal
2:ens33:<BROADCAST,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000
link/ether00:0c:29:1b:f5:aebrdff:ff:ff:ff:ff:ff
inet172.18.17.34/16brd172.18.255.255scopeglobalens33
valid_lftforeverpreferred_lftforever
#这里是Baskup服务所以不会有VIP地址
[root@shiyan7~]#ipvsadm-ln
IPVirtualServerversion1.2.1(size=4096)
ProtLocalAddress:PortSchedulerFlags
->RemoteAddress:PortForwardWeightActiveConnInActConn
TCP172.18.17.30:80lcpersistent50
->172.18.17.32:80Route100
->172.18.17.33:80Route100

测试服务

#正常测试
[root@yum~]#curlhttp://172.18.17.30
<h1>RS1:172.18.17.32</h1>

[root@yum~]#curlhttp://172.18.17.30
<h1>RS1:172.18.17.34</h1>

#关闭Nginx1测试
[root@yum~]#curlhttp://172.18.17.30
<h1>RS1:172.18.17.33</h1>

#关闭所有Nginx服务测试
[root@yum~]#curlhttp://172.18.17.30
Sorryserver-1

#关闭Master测试
[root@yum~]#curlhttp://172.18.17.30
Sorryserver-2

原文链接：https://www.f2er.com/centos/377573.html

Centos Keepalived-Ha集群+Lvs-DR+Nginx集群配置

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