docker 실행 후 에러확인
ubuntu@oc:~$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bb7bb334cef1 portainer/portainer-ce:latest "/portainer" 2 months ago Up 22 hours 8000/tcp, 9443/tcp, 0.0.0.0:9000->9000/tcp, :::9000->9000/tcp portainer
1b9e239d4ae5 jc21/nginx-proxy-manager:latest "/init" 2 months ago Exited (255) 22 hours ago nginxproxymanager_app_1
584e10e037ad vaultwarden/server:latest "/usr/bin/dumb-init …" 2 months ago Up 22 hours (healthy) 3012/tcp, 0.0.0.0:9090->80/tcp, :::9090->80/tcp vaultwarden
fbf21c0fa6eb jc21/mariadb-aria:10.4 "/scripts/run.sh" 16 months ago Up 53 minutes 3306/tcp nginxproxymanager_db_1
28a990781c74 psychoria/duckdns-updater "/data/entry.sh" 16 months ago Up 22 hours duckdns-updater
컨테이너의 포트 사용여부 확인
ubuntu@oc:~$ sudo lsof -i :80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
nginx 862 root 6u IPv4 27494 0t0 TCP *:http (LISTEN)
nginx 864 www-data 6u IPv4 27494 0t0 TCP *:http (LISTEN)
nginx 869 www-data 6u IPv4 27494 0t0 TCP *:http (LISTEN)
확인된 포트를 사용하는 프로세스 kill 후 재시작
ubuntu@oc:~$ sudo kill -9 862
ubuntu@oc:~$ sudo kill -9 864
ubuntu@oc:~$ sudo kill -9 869
