查看Nginx版本号

• 报文头和默认的404页面会显示Nginx服务器的版本号

curl www.baidu.com -I
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform
Connection: keep-alive
Content-Length: 277
Content-Type: text/html
Date: Thu, 17 Jun 2021 03:05:55 GMT
Etag: "575e1f60-115"
Last-Modified: Mon, 13 Jun 2016 02:50:08 GMT
Pragma: no-cache
Server: bfe/1.0.8.18

curl 10.0.0.189 -I
HTTP/1.1 200 OK
Server: nginx/1.20.1
Date: Thu, 17 Jun 2021 10:40:48 GMT
Content-Type: text/html
Content-Length: 648
Last-Modified: Thu, 17 Jun 2021 10:21:41 GMT
Connection: keep-alive
ETag: "60cb2235-288"
Accept-Ranges: bytes

Nginx关闭显示版本号

• 关闭响应报文的Server首部显示nginx版本
• 在nginx.conf配置文件中的http字段添加
  server_tokens off;
  

自定义Nginx版本信息

• 出于开发需要，我们希望显示自定义的Nginx版本信息
• 如果想自定义响应报文的nginx版本信息，需要修改安装文件源码文件，并重新编译安装
• 修改 src/core/nginx.h 修改第13-14行

#define NGINX_VERSION "2021.06.18"
#define NGINX_VER "sunginx/" NGINX_VERSION
#define NGINX_VAR "SUNGINX"

• 修改 src/http/ngx_http_header_filter_module.c第49行

static u_char ngx_http_server_string[] = "Server: nginx" CRLF;

修改安装源码包中的源文件

sed -ri.bak '/^#define NGINX_VER/s/".*"/"sunginx\/"/' src/core/nginx.h
sed -ri.bak '/^#define NGINX_VAR/s/".*"/"SUNGINX"/' src/core/nginx.h
sed -ri.bak '/^#define NGINX_VERSION/s/".*"/"20201.06.10"/' src/core/nginx.h
sed -ri.bak '/^static u_char ngx_http_server_string\[\]/s/".*"/"Server\:sunginx"/' src/http/ngx_http_header_filter_modul

重新编译源码包

用当前nginx编译参数重新生成makefile

cd /usr/local/src/nginx-1.20.1 && nginx -V 2>&1 | awk -F: '/^configure/ {print $2}' | xargs ./configure

使用修改后的makefile进行源码编译

make && objs/nginx -v
……
-ldl -lpthread -lcrypt -lpcre -lssl -lcrypto -ldl -lpthread -lz \
-Wl,-E
sed -e "s|%%PREFIX%%|/apps/nginx|" \
	-e "s|%%PID_PATH%%|/apps/nginx/logs/nginx.pid|" \
	-e "s|%%CONF_PATH%%|/apps/nginx/conf/nginx.conf|" \
	-e "s|%%ERROR_LOG_PATH%%|/apps/nginx/logs/error.log|" \
	< man/nginx.8 > objs/nginx.8
make[1]: Leaving directory '/usr/local/src/nginx-1.20.1'
nginx version: sunginx/sunginx/

平滑升级Nginx

备份原主程序

mv /apps/nginx/sbin/nginx{,.bak}

复制新主程序至原程序目录

cp objs/nginx /apps/nginx/sbin/

检查新主程序与配置文件是否兼容

/apps/nginx/sbin/nginx -t
nginx: the configuration file /apps/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /apps/nginx/conf/nginx.conf test is successful

发送信号平滑升级新主程序

cat $(find / -name nginx.pid) | xargs kill -USR2
cat $(find / -name nginx.pid.oldbin) | xargs kill -winch

优雅的关闭原主程序

• 如新主程序运行有问题，可及时拉回原主程序
  cat $(find / -name nginx.pid.oldbin) | xargs kill -hup
• 如新程序运行没问题，则可优雅的退出原主程序
  cat $(find / -name nginx.pid.oldbin) | xargs kill -quit

Nginx自定义版本信息修改完成

[root@C8-189 nginx-1.20.1]# nginx -v
nginx version: sunginx/sunginx/
[root@C8-189 nginx-1.20.1]# curl -I 127.0.0.1
HTTP/1.1 200 OK
Server:sunginx
Date: Thu, 17 Jun 2021 12:35:30 GMT
Content-Type: text/html
Content-Length: 648
Last-Modified: Thu, 17 Jun 2021 10:21:41 GMT
Connection: keep-alive
ETag: "60cb2235-288"
Accept-Ranges: bytes