不要为了尖锐的批评而生气，真理总是不合口味的。——高尔基
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.
然后一查
# 扫描端口占用 GithubIireAchao:blog achao$ sudo lsof -i :8021 Password: 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
GithubIireAchao:LaunchAgents achao$ grep -rl "intu" /Library/LaunchAgents GithubIireAchao:LaunchAgents achao$ grep -rl "intu" /Library/LaunchDaemons GithubIireAchao:LaunchDaemons achao$ grep -rl "8021" /System/Library/LaunchAgents # 找到了包含8021的服务列表 GithubIireAchao:LaunchDaemons achao$ grep -rl "8021" /System/Library/LaunchDaemons /System/Library/LaunchDaemons/com.apple.airportd.plist /System/Library/LaunchDaemons/com.apple.eapolcfg_auth.plist /System/Library/LaunchDaemons/com.apple.ftp-proxy.plist
可以挨个查看，也可以再次筛选，例如使用">8021<"等来筛选
GithubIireAchao:LaunchDaemons achao$ grep -rl "<string>8021</string>" /System/Library/LaunchDaemons /System/Library/LaunchDaemons/com.apple.ftp-proxy.plist
卸载这个服务，-w表示写入配置，这里整体是禁止下次启动
GithubIireAchao:LaunchDaemons achao$ sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.ftp-proxy.plist
再次查看端口
GithubIireAchao:LaunchDaemons achao$ sudo lsof -i :8021 GithubIireAchao:LaunchDaemons achao$
