MacOS查找并禁用系统占用的8021端口

本地启动服务一直报错:

Description:
Web server failed to start. Port 8021 was already in use.
Action:
Identify and stop the process that's listening on port 8021 or configure this application to listen on another port.

排查占用8021的进程

# 使用命令
sudo lsof -i :8021

COMMAND PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
launchd   1 root   40u  IPv4 0xe1fc8d3044233469      0t0  TCP localhost:intu-ec-client (LISTEN)
launchd   1 root   41u  IPv6 0xe1fc8d26b1acd419      0t0  TCP localhost:intu-ec-client (LISTEN)
launchd   1 root   42u  IPv4 0xe1fc8d3044233469      0t0  TCP localhost:intu-ec-client (LISTEN)
launchd   1 root   43u  IPv6 0xe1fc8d26b1acd419      0t0  TCP localhost:intu-ec-client (LISTEN)

发现占用的PID是1，即系统的 launchd 进程

因为launchd 进程会根据所在的 /Library/LaunchDaemons 和 /Library/LaunchAgents 目录中的配置文件来管理各个服务或应用，扫描文件找到服务，当然这个目录也可能是/System/Library/LaunchAgents和/System/Library/LaunchDaemons

grep -rl "intu" /Library/LaunchAgents
grep -rl "intu" /Library/LaunchDaemons
grep -rl "8021" /System/Library/LaunchAgents
grep -rl "8021" /System/Library/LaunchDaemons 

# 最后一个找到了包含8021的服务列表
/System/Library/LaunchDaemons/com.apple.airportd.plist
/System/Library/LaunchDaemons/com.apple.eapolcfg_auth.plist
/System/Library/LaunchDaemons/com.apple.ftp-proxy.plist

再次筛选：

grep -rl ">8021<" /System/Library/LaunchDaemons

# 找到占用8021端口的服务
/System/Library/LaunchDaemons/com.apple.ftp-proxy.plist

卸载服务

# 卸载这个服务，-w表示写入配置，这里整体是禁止下次启动
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.ftp-proxy.plist