负载均衡，反向代理
没有什么是加一层是解决不了，高性能的HTTP的反向代理服务器，
占用内存少，
登陆这个网站nginx.org
下载nginx

[root@localhost ~]# nginx
-bash: nginx: command not found
[root@localhost ~]# ls
anaconda-ks.cfg             ifdemo.sh
apache-tomcat-9.0.7         javase8u211-later-archive-downloads.html
apache-tomcat-9.0.7.tar.gz  jdk-8u181-linux-x64.tar.gz
docker                      lingluan
dockerfile                  myshell.sh
Dockerfile                  mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz
dockerfile-cmd-entory       nginx-1.18.0.tar.gz
dockerfile-cmd-test         oper.sh
docker-test-volume          preVar.sh
hava.java                   readme.txt
hellworld.sh                --restart=alwys
hi.sh                       shcode
[root@localhost ~]# tar -zxvf nginx-1.18.0.tar.gz
 
tar -zxvf nginx-1.18.0.tar.gz
 
[root@localhost ~]# cd nginx-1.18.0
[root@localhost nginx-1.18.0]# ls
auto     CHANGES.ru  configure  html     man     src
CHANGES  conf        contrib    LICENSE  README
 
    
 #进入cd nginx-1.18.0 ls 显示有哪些文件
 
 [root@localhost nginx-1.18.0]# ./configure
checking for OS
 + Linux 3.10.0-1160.el7.x86_64 x86_64
checking for C compiler ... found
 + using GNU C compiler
 
 #make install
 、
 
 [root@localhost nginx-1.18.0]# whereis nginx 查看nginx 的配置文件在哪里
nginx: /usr/local/nginx
[root@localhost nginx-1.18.0]# cd /usr/local/nginx/ 进入
[root@localhost nginx]# ll
total 4
drwxr-xr-x. 2 root root 4096 Sep 15 22:57 conf
drwxr-xr-x. 2 root root   40 Sep 15 22:47 html
drwxr-xr-x. 2 root root    6 Sep 15 22:47 logs
drwxr-xr-x. 2 root root   36 Jan 10 22:18 sbin
[root@localhost nginx]# cd sbin/ 
[root@localhost sbin]# ls
nginx  nginx.old
[root@localhost sbin]# ./nginx开启nginx
[root@localhost sbin]# cd .. 
[root@localhost nginx]# cd conf/进入配置文件文件夹
[root@localhost conf]# ls
fastcgi.conf            koi-win             scgi_params
fastcgi.conf.default    mime.types          scgi_params.default
fastcgi_params          mime.types.default  uwsgi_params
fastcgi_params.default  nginx.conf          uwsgi_params.default
koi-utf                 nginx.conf.default  win-utf
[root@localhost conf]# cat nginx.conf 查看配置文件
 
#user  nobody;
worker_processes  1;
 
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
 
#pid        logs/nginx.pid;
 
 
events {
    worker_connections  1024;
}
 
 
http {
    include       mime.types;
    default_type  application/octet-stream;
 
    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';
 
    #access_log  logs/access.log  main;
 
    sendfile        on;
    #tcp_nopush     on;
 
    #keepalive_timeout  0;
    keepalive_timeout  65;
 
    #gzip  on;
 
    server {   端口是80
        listen       80;
        server_name  localhost;
 
        #charset koi8-r;
 
        #access_log  logs/host.access.log  main;
 
        location / {
            root   html;
            index  index.html index.htm;
        }
 
        #error_page  404              /404.html;
 
        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
 
        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}
 
        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}
 
        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }
 
 
    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;
 
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
 
 
    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;
 
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;
 
    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;
 
    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;
 
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
 
}
http://192.168.31.200：80查看是否可以访问，
不能访问，查看防火墙端口是否打开   云服务的80是否能打开，
 
 

nginx的常用命令

cd /usr/local/nginx/sbin
./nigix
./nginx -s stop
./nginx -s quit
./nginx -s reload 重新加载配置文件
ps aux|grep nginx 查看nginx 进程
 

[root@localhost conf]# vim nginx.conf
[root@localhost conf]# ./nginx -s reload
-bash: ./nginx: No such file or directory
[root@localhost conf]# ls
fastcgi.conf            koi-win             scgi_params
fastcgi.conf.default    mime.types          scgi_params.default
fastcgi_params          mime.types.default  uwsgi_params
fastcgi_params.default  nginx.conf          uwsgi_params.default
koi-utf                 nginx.conf.default  win-utf
[root@localhost conf]# cd ..
[root@localhost nginx]# ./nginx -s reload
-bash: ./nginx: No such file or directory
[root@localhost nginx]# ls
client_body_temp  fastcgi_temp  logs        sbin       uwsgi_temp
conf              html          proxy_temp  scgi_temp
[root@localhost nginx]# cd sbin/
[root@localhost sbin]# ./nginx -s reload
[root@localhost sbin]#