sudo /usr/local/bin/openresty
nginx: [emerg] bind() to 0.0.0.0:80 failed (48: Address already in use)
However, through the commands: sudo netstat -n|grep 80 and ps -A|grep nginx, I can't find which program occupies port 80.
The process of subsequent exploration:1. lsof -P -itcp:80
-P is to display the port number, not the program name. -i followed by "protocol@server:port" cannot be
found.
2. sudo lsof -P -itcp:80 , the results are as follows:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
httpd 82 root 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
httpd 268 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
SogouServ 368 xushengbin 20u IPv4 0x3ef15ffdcda6971f 0t0 TCP 10.10.2.251:50215->180.149.156.142:80 (ESTABLISHED)
SogouServ 368 xushengbin 23u IPv4 0x3ef15ffdcda6971f 0t0 TCP 10.10.2.251:50215->180.149.156.142:80 (ESTABLISHED)
httpd 658 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
httpd 659 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
httpd 660 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
httpd 662 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
httpd 663 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
httpd 664 _www 4u IPv6 0x3ef15ffdc5dd853f 0t0 TCP *:80 (LISTEN)
found it. It is the apache program that comes with the mac and starts automatically.
3. You can also display all processes through pstree:
|-+= 00082 root /usr/sbin/httpd -D FOREGROUND
| |--- 00268 _www /usr/sbin/httpd -D FOREGROUND
| |--- 00658 _www /usr/sbin/httpd -D FOREGROUND
| |--- 00659 _www /usr/sbin/httpd -D FOREGROUND
| |--- 00660 _www /usr/sbin/httpd -D FOREGROUND
| |--- 00662 _www /usr/sbin/httpd -D FOREGROUND
| |--- 00663 _www /usr/sbin/httpd -D FOREGROUND
| \--- 00664 _www /usr/sbin/httpd -D FOREGROUND
Summary:
1. I still don't understand why "sudo netstat -n|grep 80" can't find the process corresponding to port 80.
2. lsof, plus sudo, can display all files opened by users.
3. ps -A|grep nginx, the program occupying port 80 is not called nginx, but apache, so it cannot be found
. 4. After installing nginx, another problem is involved. How to start the program installed by brew install:
Currently There are two ways to learn about launchctl and homebrew services:
the following is the official introduction to homebrew services:
Integrates Homebrew formulae with MacOS X's launchctl manager.
Explain that homebrew services is an integration of launchctl. Then it is best to use homebrew services to control the startup of software under mac.
The specific command is as follows:For example, I want to start openresty:
execute the command brew info openresty to
output the result:
To have launchd start homebrew/nginx/openresty now and restart at login:
brew services start homebrew/nginx/openresty
should add openresty to the startup items.
You can view all startup items (including those added through launchctl load) through brew services list. The output is as follows:
memcached started xushengbin /Users/xushengbin/Library/LaunchAgents/homebrew.mxcl.memcached.plist
mysql stopped
openresty started xushengbin /Users/xushengbin/Library/LaunchAgents/homebrew.mxcl.openresty.plist
php53 stopped
php56 stopped
php70 started xushengbin /Users/xushengbin/Library/LaunchAgents/homebrew.mxcl.php70.plist
redis started xushengbin /Users/xushengbin/Library/LaunchAgents/homebrew.mxcl.redis.plist
Shutting down, restarting, launching openresty did not start automatically. Think about it, it should be openresty occupying port 80, and it must be started by the root account. The current login account cannot be started. Therefore, you can change to
sudo brew services start homebrew/nginx/openresty
.
The difference between brew services start and sudo brew services start is:
the former is start service at login and the latter is start service at boot
In addition, if you want to clear invalid startup items, you can use the command:
brew services cleanup
brew services above
参考文档：
Starting and Stopping Background Services with Homebrew
GitHub - Homebrew/homebrew-services: Starts Homebrew formulae's plists with launchctl
With launchctl usage:
Running launchctl list displays the current launch script.sudo launchctl unload [path/to/script] Stop the running startup script, plus the -w option to remove the startup.