Nginx反向代理+keepalived
2024-10-09 08:15:48
环境两台LB（nginx）、两台web（nginx/apache都行）
安装httpd
web01
[root@web01 /]# /etc/init.d/iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ] [root@web01 /]# yum -y install httpd
[root@web01 /]# vim /etc/httpd/conf/httpd.conf
Servername 127.0.0.1
[root@web01 /]# echo "web01_192.168.119.130" > /var/www/html/index.html
[root@web01 /]# /etc/init.d/httpd start
Starting httpd: [ OK ]
[root@web01 /]# curl 192.168.119.130
web01_192.168.119.
web02
[root@web02 /]# /etc/init.d/iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
[root@web02 /]# yum -y install httpd
[root@web02 /]# vim /etc/httpd/conf/httpd.conf
ServerName 127.0.0.1
[root@web02 /]# echo "web02_192.168.119.131" > /var/www/html/index.html
[root@web02 /]# /etc/init.d/httpd start
Starting httpd: [ OK ]
[root@web02 /]# curl 192.168.119.131
web02_192.168.119.
两台LB
lb01和lb02配置相同
环境准备
[root@lb01 /]# yum -y install pcre pcre-devel openssl openssl-devel gcc gcc-c++
下载软件
[root@lb01 /]# wget http://nginx.org/download/nginx-1.6.3.tar.gz
解压、配置、编译、安装
[root@lb01 conf]# useradd nginx -s /sbin/nologin -M
[root@lb01 /]# tar zxvf nginx-1.6..tar.gz
[root@lb01 /]# cd nginx-1.6.3 [root@lb01 nginx-1.6.3]# ./configure --user=nginx --group=nginx --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_modul
[root@lb01 nginx-1.6.]# make && make install
[root@lb01 nginx-1.6.]# ln -s /usr/local/nginx/sbin/* /usr/local/sbin/
[root@lb01 nginx-1.6.3]# cd /usr/local/nginx/conf/
[root@lb01 conf]# ll nginx.conf nginx.conf.default
-rw-r--r--. 1 root root 2656 Sep 26 06:33 nginx.conf
-rw-r--r--. 1 root root 2656 Sep 26 06:33 nginx.conf.default
[root@lb01 conf]# egrep -v "#|^$" nginx.conf.default >nginx.conf
[root@lb01 conf]# vim nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream web_pools {
server 192.168.119.130:80 weight=5;
server 192.168.119.131:80 weight=5; }
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
proxy_pass http://web_pools;
include proxy.conf;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
} [root@lb01 conf]# cat proxy.conf
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 4K;
proxy_buffers 3 32K;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
启动nginx
[root@lb01 conf]# nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@lb01 conf]# nginx
[root@lb01 conf]# netstat -anpt | grep nginx
tcp 0.0.0.0: 0.0.0.0:* LISTEN /nginx
[root@lb01 conf]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
:: localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.119.128 www.test.com
测试
[root@lb01 conf]# curl www.test.com
web02_192.168.119.
[root@lb01 conf]# curl www.test.com
web01_192.168.119.
[root@lb01 conf]# curl www.test.com
web02_192.168.119.
[root@lb01 conf]# curl www.test.com
web01_192.168.119.
[root@lb01 conf]# curl www.test.com
web02_192.168.119.
lb02配置与lb01相同步骤略、直接测试
[root@lb02 conf]# nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@lb02 conf]# nginx [root@lb02 conf]# echo "192.168.119.129 www.test.com" >> /etc/hosts
[root@lb02 conf]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
:: localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.119.129 www.test.com [root@lb02 conf]# curl www.test.com
web01_192.168.119.
[root@lb02 conf]# curl www.test.com
web02_192.168.119.
[root@lb02 conf]# curl www.test.com
web01_192.168.119.
[root@lb02 conf]# curl www.test.com
web02_192.168.119.
[root@lb02 conf]# curl www.test.com
web01_192.168.119.
两台LB安装都已完成
在两台LB上安装keepalived
环境配置
LB01和LB02配置相同
[root@lb01 /]# yum -y install kernel-devel
做个软连接 用tab键补全2.6.32-642.6.2.el6.x86_64
[root@lb01 /]# ln -s /usr/src/kernels/2.6.-642.4..el6.x86_64/ /usr/src/linux
[root@lb01 /]# ll /usr/src/
total
drwxr-xr-x. root root Sep debug
drwxr-xr-x. root root Sep : kernels
lrwxrwxrwx. root root Sep : linux -> /usr/src/kernels/2.6.-642.4..el6.x86_64/
下载软件
[root@lb01 /]# wget http://www.keepalived.org/software/keepalived-1.2.16.tar.gz
---- ::-- http://www.keepalived.org/software/keepalived-1.2.16.tar.gz
Resolving www.keepalived.org... 37.59.63.157, :41d0::7a9d::
Connecting to www.keepalived.org|37.59.63.157|:... connected.
HTTP request sent, awaiting response... OK
Length: (339K) [application/x-gzip]
Saving to: “keepalived-1.2..tar.gz” %[=================================================>] , .96K/s in 2m 30s -- :: (2.27 KB/s) - “keepalived-1.2..tar.gz” saved [/] [root@lb01 /]# ll keepalived-1.2..tar.gz
-rw-r--r--. root root Mar keepalived-1.2..tar.gz
解压、配置、编译、安装
[root@lb01 /]# tar zxvf keepalived-1.2..tar.gz
[root@lb01 /]# cd keepalived-1.2.
[root@lb01 keepalived-1.2.]# ./configure
Keepalived configuration
------------------------
Keepalived version : 1.2.
Compiler : gcc
Compiler flags : -g -O2
Extra Lib : -lssl -lcrypto -lcrypt
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
IPVS use libnl : No
fwmark socket support : Yes
Use VRRP Framework : Yes
Use VRRP VMAC : Yes
SNMP support : No
SHA1 support : No
Use Debug flags : No [root@lb01 keepalived-1.2.]# make && make install
配置规范启动
[root@lb01 keepalived-1.2.]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/ #生成启动脚本
[root@lb01 keepalived-1.2.]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/ #配置启动脚本的参数
[root@lb01 keepalived-1.2.]# mkdir /etc/keepalived #创建默认的keepalived配置文件路径
[root@lb01 keepalived-1.2.]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/ #把keepalived.conf模板拷贝到/etckeepalived下
[root@lb01 keepalived-1.2.]# cp /usr/local/sbin/keepalived /usr/sbin/
[root@lb01 keepalived-1.2.]# /etc/init.d/keepalived start
Starting keepalived: [ OK ]
[root@lb01 keepalived-1.2.]# ps -ef | grep keep
root : ? :: keepalived -D
root : ? :: keepalived -D
root : ? :: keepalived -D
root : pts/ :: grep keep
[root@lb01 keepalived-1.2.]# /etc/init.d/keepalived stop
Stopping keepalived: [ OK ]
修改配置文件
先备份一个配置文件
lb01配置文件
[root@lb01 keepalived-1.2.]# cd /etc/keepalived/
[root@lb01 keepalived]# cp keepalived.conf keepalived.conf.bak
[root@lb01 keepalived]# vim keepalived.conf
! Configuration File for keepalived global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout
router_id LVS_01
} vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id
priority
advert_int
authentication {
auth_type PASS
auth_pass
}
virtual_ipaddress {
192.168.119.150/
}
}
lb02配置文件
[root@lb02 keepalived-1.2.]# cd /etc/keepalived/
[root@lb02 keepalived]# cp keepalived.conf keepalived.conf.bak
[root@lb02 keepalived]# vim keepalived.conf
! Configuration File for keepalived global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout
router_id LVS_02
} vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id
priority
advert_int
authentication {
auth_type PASS
auth_pass
}
virtual_ipaddress {
192.168.119.150/
}
}
启动keepalived
[root@lb01 keepalived]# /etc/init.d/keepalived start
Starting keepalived: [ OK ]
[root@lb02 keepalived]# /etc/init.d/keepalived start
Starting keepalived: [ OK ]
在master(lb01)查看虚拟IP（192.168.119.150）
提示：使用ifconfig是查不到的；使用 ip add查询
[root@lb01 keepalived]# ip add | grep 192.168.119.150
inet 192.168.119.150/ scope global secondary eth0
[root@lb01 keepalived]#
在backup(lb02)查看(没有虚拟IP)
[root@lb02 keepalived]# ip add | grep 192.168.119.150
把master的keepalived服务down、虚拟IP就会自动切换到backup
[root@lb01 keepalived]# /etc/init.d/keepalived stop
Stopping keepalived: [ OK ]
[root@lb01 keepalived]# ip add | grep 192.168.119.150
[root@lb01 keepalived]#
backup查询
[root@lb02 keepalived]# ip add | grep 192.168.119.150
[root@lb02 keepalived]# ip add | grep 192.168.119.150
[root@lb02 keepalived]# ip add | grep 192.168.119.150
[root@lb02 keepalived]# ip add | grep 192.168.119.150
[root@lb02 keepalived]# ip add | grep 192.168.119.150
inet 192.168.119.150/ scope global secondary eth0
[root@lb02 keepalived]# ip add | grep 192.168.119.150
inet 192.168.119.150/ scope global secondary eth0
当master的keepalived服务启动时、虚拟IP会自动从backup切回到master
测试web是否正常
[root@lb01 keepalived]# curl 192.168.119.150
web01_192.168.119.
[root@lb01 keepalived]# curl 192.168.119.150
web02_192.168.119.
[root@lb01 keepalived]# curl 192.168.119.150
web01_192.168.119.
[root@lb01 keepalived]# curl 192.168.119.150
web02_192.168.119.
[root@lb01 keepalived]# curl 192.168.119.150
web01_192.168.119.
[root@lb01 keepalived]# curl 192.168.119.150
web02_192.168.119.
[root@lb01 keepalived]# curl 192.168.119.150
web01_192.168.119.
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