通过nginx实现负载均衡

实验主机为server2

一、在官网下载nginx-1.18.0.tar.gz到/root下然后安装软件

[[e-mail] ~]# tar xf nginx-1.18.0.tar.gz
[[e-mail] ~]# cd nginx-1.18.0/
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[[e-mail] nginx-1.18.0]#./configure --prefix=/usr/local/nginx --with-http_ssl_module
    checking for OS
     + Linux 4.18.0-80.el8.x86_64 x86_64
    checking for C compiler ... not found

 ./configure: error: C compiler cc is not found    ##显示需要安装gcc
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[[e-mail] nginx-1.18.0]# dnf install -y gcc
[[e-mail] nginx-1.18.0]#./configure --prefix=/usr/local/nginx --with-http_ssl_module
option, or install the PCRE library into the system, or build the PCRE library
statically from the source with nginx by using --with-pcre=<path> option.
######显示需要安装pcre-devel
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[[e-mail] nginx-1.18.0]# dnf install -y pcre-devel
[[e-mail] nginx-1.18.0]#./configure --prefix=/usr/local/nginx --with-http_ssl_module
./configure: error: SSL modules require the OpenSSL library.
You can either do not enable the modules, or install the OpenSSL library
into the system, or build the OpenSSL library statically from the source
with nginx by using --with-openssl=<path> option.   ##显示需要安装openssl-devel
--------------------------------------------------------------------------------------
[[e-mail] nginx-1.18.0]# dnf install -y openssl-devel
[[e-mail] nginx-1.18.0]#./configure --prefix=/usr/local/nginx --with-http_ssl_module
Configuration summary
  + using system PCRE library
  + using system OpenSSL library
  + using system zlib library

---

二、自动生成/usr/local/nginx

[[e-mail] nginx-1.18.0]# make && make install 
[[e-mail] nginx-1.18.0]# ll -d /usr/local/nginx/
drwxr-xr-x 6 root root 54 Aug  9 15:47 /usr/local/nginx/

三、执行nginx服务，过滤80端口

[[e-mail] sbin]# cd /usr/local/nginx/sbin/ 
[[e-mail] sbin]# ./nginx -v  
nginx version: nginx/1.18.0
[[e-mail] sbin]# ./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
[[e-mail] sbin]# ./nginx       ##80端口不要被其他占用，否则无效
[[e-mail] sbin]# netstat -antlp | grep 80   ##80端口不要被其他占用
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      22108/nginx: master 
[[e-mail] sbin]# ./nginx -s stop 
[[e-mail] sbin]# netstat -antlp | grep 80 ##过滤不到了 进程都关了

四、修改配置文件以及编辑服务nginx.service

[[e-mail] ~]# vi /root/nginx-1.18.0/auto/cc/gcc
# debug                   ##:/debug
#CFLAGS="$CFLAGS -g"      ##注释掉这一行
----------------------------------------------------------
[[e-mail] ~]# vi /root/nginx-1.18.0/src/core/nginx.h
#define nginx_version      1018000
#define NGINX_VERSION      "1.18.0"
#define NGINX_VER          "nginx"     ##不显示版本号
---------------------------------------------------------
[[e-mail] ~]# vi /usr/lib/systemd/system/nginx.service
[Unit]
Description=The NGINX HTTP and reverse proxy server
After=syslog.target network-online.target remote-fs.target nss-lookup.target
Wants=network-online.target

[Service]
Type=forking
PIDFile=/usr/local/nginx/nginx.pid    ##注意各自nginx的路径
ExecStartPre=/usr/local/nginx/sbin/nginx -t
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/bin/kill -s QUIT $MAINPID
PrivateTmp=true

[Install]
WantedBy=multi-user.target
------------------------------------------------------------
systemctl daemon-reload
systemctl start nginx.service
------------------------------------------------------------
[[e-mail] ~]# vi /etc/security/limits.conf 
 nginx           -       nofile          65535  ##倒数第二行添加nginx的
# End of file

五、添加nginx用户

[[e-mail] ~]# useradd -M -d /usr/local/nginx -s /sbin/nologin nginx

六、编辑nginx的配置文件

[[e-mail] ~]# vi /usr/local/nginx/conf/nginx.conf
2 #user  nobody;
3 worker_processes  auto;         ##cpu的个数 auto自动获取
33     #gzip  on;
34     upstream westos {
35         #ip_hash；               ##hash算法先调用那个就一直调用  
36         server 172.25.7.4;       ##server3
37         server 172.25.7.5;       ##server4
38     }
39     server {
40         listen       80;
41         server_name www.westos.org;
42         location / {
43             proxy_pass http://westos;
44         }
45     }
46     server {
47         listen       80;
48         server_name  localhost;

七、重启nginx服务并且修改server1的地址解析

[[e-mail] ~]# sytemctl restart nginx.service
[[e-mail] ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
172.25.7.250 Horizon_ley
172.25.7.1   server0
172.25.7.2   server1
172.25.7.3   server2
172.25.7.4   server3
172.25.7.5   server4
172.25.7.6   server5
172.25.7.7   server6
172.25.7.8   server7

 

[[e-mail] ~]# curl 172.25.7.3
this is vm3
[[e-mail] ~]# curl 172.25.7.3
this is vm4
[[e-mail] ~]# curl 172.25.7.3
this is vm3
[[e-mail] ~]# curl 172.25.7.3
this is vm4

 通过nginx实现负载均衡success