Home >Operation and Maintenance >Linux Operation and Maintenance >Running and controlling Nginx - command line parameters and signals
Reference materials:
Nginx Chinese documentation:
Nginx start, stop, smooth restart, signal control and smooth upgrade:
Command line parameters:
Common commands:
-c filename: Set the configuration file.
-t: Do not run, but only test the configuration file. nginx will check the syntax of the configuration file for correctness and try to open the files referenced in the configuration file.
-s: Pass a signal, stop closes quickly, quit closes calmly, reopen reopens the log file, switches log files, and reloads the configuration file.
-v: Display the nginx version.
-V: Display nginx version, compiler version and configuration parameters
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[root@localhost /]# alias nginx='/usr/local/nginx/sbin/nginx'<br>[root@localhost /]# alias
<br>
[root@localhost /]# nginx -h nginx version: nginx/1.11.13Usage: nginx [-?hvVtTq] [-s signal] [-c filename] [-p prefix] [-g directives] Options: -?,-h : this help -v : show version and exit -V : show version and configure options then exit -t : test configuration and exit -T : test configuration, dump it and exit -q : suppress non-error messages during configuration testing -s signal : send signal to a master process: stop, quit, reopen, reload -p prefix : set prefix path (default: /usr/local/nginx/) -c filename : set configuration file (default: conf/nginx.conf) -g directives : set global directives out of configuration file[root@localhost /]#
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control signal :
You can use the signal system to control the main process. By default, nginx writes the pid of its main process to the /usr/local/nginx/logs/nginx.pid file. Change the location of this file by passing arguments to ./configure or using the pid command.
The main process can handle the following signals:
TERM,INT | Quick shutdown |
QUIT | Close gracefully |
HUP |
Reconfigure Start a new worker process with a new configuration Close the old worker process calmly |
USR1 | Reopen the log file, which is more useful when cutting logs |
USR2 | Smoothly upgrade the executable program |
WINCH | Close the worker process gracefully |
启动:
启动代码格式:nginx安装目录地址 -c nginx配置文件地址
[root@localhost ~]# alias nginx='/usr/local/nginx/sbin/nginx' [root@localhost ~]# nginx -c /usr/local/nginx/conf/nginx.conf [root@localhost ~]# ps -ef|grep nginx root 2073 1 0 10:37 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf nobody 2074 2073 0 10:37 ? 00:00:00 nginx: worker process root 2076 2022 0 10:37 pts/0 00:00:00 grep nginx [root@localhost ~]#
停止:
从容停止:
# ` 字符是数字键盘 1 字符左边的那个字符
[root@localhost ~]# kill -QUIT `cat /usr/local/nginx/logs/nginx.pid`
快速停止:
[root@localhost ~]# kill -TERM `cat /usr/local/nginx/logs/nginx.pid`
或
[root@localhost ~]# kill -INT `cat /usr/local/nginx/logs/nginx.pid`
强行停止:
[root@localhost ~]# kill -9 nginx
重启:
1.普通重启:关闭进程,修改配置后,重启进程
2.重新加载配置文件,不重启进程,不会停止处理请求
3.平滑更新nginx二进制,不会停止处理请求
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注意:在重载前,测试一下配置文件:
# -t 参数将检查配置文件的语法是否正确,默认会检查 /usr/local/nginx/conf/nginx.conf 文件
[root@localhost ~]# /usr/local/nginx/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
# 如果要对指定配置文件进行语法检查,可以继续添加 -c 参数
[root@localhost ~]# /usr/local/nginx/sbin/nginx -t -c /usr/local/nginx/conf/nginx.conf 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@localhost ~]#
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nginx的平滑重启:
如果改变了nginx的配置文件,想重启nginx,同样可以发送系统型号给nginx主进程的方式来进行,重启之前,要确认配置文件是否正确
[root@localhost ~]# kill -HUP 【nginx主进程号】
当 nginx 接收到 HUP 信号时,它会尝试先解析配置文件,如果成功,就应用新的配置文件(例如,重新打开日志文件或监听的套接字)。之后,nginx 运行新的工作进程并从容关闭旧的工作进程。通知工作进程关闭监听套接字,但是继续为当前连接的客户提供服务。所有的客户端的服务完成后,旧的工作进程被关闭。如果新的配置文件应用失败,nginx 将继续使用旧的配置文件进行工作。
nginx的平滑升级:
当需要将正在运行中的nginx升级、添加/删除服务器模块时,可以在不中断服务的情况下,使用新的nginx可执行程序替换旧的:
1.使用新的可执行程序替换旧的可执行程序,对于编译安装的nginx,可以将新版本编译安装到nginx安装路径中,替换之前,备份一下旧的可执行文件
2.发送以下指令:
[root@localhost ~]# kill -USR2 【旧版本的nginx主进程号】
3.旧版本的nginx的主进程将重命名它的pid文件为.oldbin(例如:/usr/local/nginx/logs/nginx.pid.oldbin),然后执行新版本的nginx可执行程序,依次启动新的主进程和新的工作进程。
4.此时,新、旧版本的nginx实例会同时运行,共同处理输入的请求,要逐步停止旧版本的nginx,必须发送WINCH信号给旧的主进程,然后,它的工作进程就开始从容关闭:
[root@localhost ~]# kill -WINCH 【旧版本的nginx主进程号】
5.一段时间后,旧的工作进程(worker process)处理了所有已连接的请求后退出,仅由新的工作进程来处理输入的请求了。
6.这时候,可以决定是使用新版本,还是恢复到旧版了:
kill -HUP 【旧的主进程号】:nginx将在不重载配置文件的情况下启动它的工作进程
kill -QUIT 【新的主进程号】:从容关闭其工作进程(worker process)
kill -TERM 【新的主进程号】:强制退出
kill 【新的主进程号或旧的主进程号】:如果因为某些原因新的工作进程不能退出,则向其发送kill信号
新的主进程退出后,旧的主进程会移除.oldbin前缀,恢复为它的.pid文件,这样,一切就都恢复到升级之前了。
如果尝试升级成功,而你也希望保留新的服务器时,可发送QUIT信号给旧的主进程,使其退出而只留下新的服务器运行。
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