在Centos7上将Apache（httpd）切换为Nginx的过程记录

　　近期要上线几个基于tornado+motor的移动端接口服务，众所周知，Apache和tornado天生八字不合，尤其apache对python3尤为的不友好，tornado和nginx才是木石前盟，另外由于apache目前系统占用确实比较高，不光进程数多，httpd竟然占用了200多M，太庞大，决定换为较轻量级，高并发的nginx。
　　如上图所示：系统也就2g ,除了mysql占用的100M, httpd 占了1/2 还多
　　首先由于apache和nginx默认都是监听80端口，所以首先要停止apache服务（为了保险起见，只是停止服务，不要卸载） systemctl  stop httpd
　　第二步，安装nginx #设置源 sudo rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm  #安装 yum install -y nginx  #启动服务 systemctl start nginx.service  #开机自启 systemctl enable nginx.service
　　由于机器上还有一些php服务，而nginx需要php-fpm的支持才能代理php，所以安装php-fpm yum install php-fpm  yum install php-mysql php-gd libjpeg* php-imap php-ldap php-odbc php-pear php-xml php-xmlrpc php-mbstring php-mcrypt php-bcmath php-mhash libmcrypt  开启php服务 systemctl start php-fpm  开机启动php服务 systemctl enable php-fpm
　　然后将原来apache的服务配置翻译成nginx的，二者大同小异，值得一提的是，关于https服务，nginx配置要简单很多
　　apache配置：   #   General setup for the virtual host DocumentRoot ＂/opt/v3u＂ ServerName v3u.cn:443 ServerAdmin you@example.com ErrorLog ＂/opt/lampp/logs/error_log＂ TransferLog ＂/opt/lampp/logs/access_log＂  #   SSL Engine Switch: #   Enable/Disable SSL for this virtual host. SSLEngine on   SSLCertificateFile ＂证书目录＂ SSLCertificateKeyFile ＂证书目录＂ SSLCertificateChainFile ＂证书目录＂        SSLOptions +StdEnvVars       SSLOptions +StdEnvVars    BrowserMatch ＂MSIE [2-5]＂           nokeepalive ssl-unclean-shutdown           downgrade-1.0 force-response-1.0  CustomLog ＂/opt/lampp/logs/ssl_request_log＂            ＂%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x ＂%r＂ %b＂  
　　翻译为ngixn的配置: server {         listen 443 ssl;         server_name v3u.cn;         root /opt/v3u; location / {             index  index.html index.htm index.php;         rewrite ^/sitemap.xml$ /Index_sitemap last; 	rewrite ^/resume$ /Index_resume last; 	rewrite ^/search_(.+?)$ /Index_search_text_$1 last; 	rewrite ^/a_id_(.+?)$ /Index_a_id_$1 last; 	rewrite ^/ls_id_(.+?)$ /Index_ls_id_$1 last; 	rewrite ^/l_id_(.+?)$ /Index_l_id_$1 last;                    if (!-e $request_filename) {    rewrite  ^(.*)$  /index.php?s=$1  last;    break;     }          }          ssl_certificate   证书目录;         ssl_certificate_key  证书目录;          location ~ .php(.*)$ {                 fastcgi_pass   127.0.0.1:9000;                 fastcgi_index  index.php;                 fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;                 fastcgi_param PATH_INFO $1;                 include fastcgi_params;         } }
　　修改好配置文件，重启nginx systemctl restart nginx.service
　　最后别忘了将apache的开机自启关闭 systemctl disable httpd
　　ok，到此从apache迁移到nginx就配置结束了，总体上没啥难度
　　由图上可知，应用了nginx之后，系统感觉清爽了很多，内存也节约了大约300多m，系统告别臃肿，轻装上阵。