컨텍스트: 서버 Ubuntu 20.04.1, 커널 5.4.0-53-일반
다음 오류가 하루에 여러 번 발생합니다(시스템 로그).
Dec 2 18:02:33 my-host systemd[1]: Stopping User Manager for UID 1002...
Dec 2 18:02:33 my-host systemd[1412956]: Stopped target Main User Target.
Dec 2 18:02:33 my-host systemd[1412956]: Stopped target Basic System.
Dec 2 18:02:33 my-host systemd[1412956]: Stopped target Paths.
Dec 2 18:02:33 my-host systemd[1412956]: Stopped target Sockets.
Dec 2 18:02:33 my-host systemd[1412956]: Stopped target Timers.
Dec 2 18:02:33 my-host systemd[1412956]: dbus.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed D-Bus User Message Bus Socket.
Dec 2 18:02:33 my-host systemd[1412956]: dirmngr.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed GnuPG network certificate management daemon.
Dec 2 18:02:33 my-host systemd[1412956]: gpg-agent-browser.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed GnuPG cryptographic agent and passphrase cache (access for web browsers).
Dec 2 18:02:33 my-host systemd[1412956]: gpg-agent-extra.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed GnuPG cryptographic agent and passphrase cache (restricted).
Dec 2 18:02:33 my-host systemd[1412956]: gpg-agent-ssh.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed GnuPG cryptographic agent (ssh-agent emulation).
Dec 2 18:02:33 my-host systemd[1412956]: gpg-agent.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed GnuPG cryptographic agent and passphrase cache.
Dec 2 18:02:33 my-host systemd[1412956]: pk-debconf-helper.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed debconf communication socket.
Dec 2 18:02:33 my-host systemd[1412956]: snapd.session-agent.socket: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Closed REST API socket for snapd user session agent.
Dec 2 18:02:33 my-host systemd[1412956]: Reached target Shutdown.
Dec 2 18:02:33 my-host systemd[1412956]: systemd-exit.service: Succeeded.
Dec 2 18:02:33 my-host systemd[1412956]: Finished Exit the Session.
Dec 2 18:02:33 my-host systemd[1412956]: Reached target Exit the Session.
Dec 2 18:02:33 my-host systemd[1]: [email protected]: Succeeded.
Dec 2 18:02:33 my-host systemd[1]: Stopped User Manager for UID 1002.
Dec 2 18:02:33 my-host systemd[1]: Stopping User Runtime Directory /run/user/1002...
Dec 2 18:02:33 my-host systemd[1]: run-user-1002.mount: Succeeded.
Dec 2 18:02:33 my-host systemd[1]: [email protected]: Succeeded.
Dec 2 18:02:33 my-host systemd[1]: Stopped User Runtime Directory /run/user/1002.
Dec 2 18:02:33 my-host systemd[1]: Removed slice User Slice of UID 1002.
Dec 2 18:02:34 my-host systemd[1]: apache2.service: Main process exited, code=exited, status=1/FAILURE
Dec 2 18:02:34 my-host systemd[1]: apache2.service: Failed with result 'exit-code'.
Dec 2 18:02:34 my-host systemd[1]: apache2.service: Scheduled restart job, restart counter is at 3.
Dec 2 18:02:34 my-host systemd[1]: Stopped The Apache HTTP Server.
Dec 2 18:02:34 my-host systemd[1]: Starting The Apache HTTP Server...
Dec 2 18:02:34 my-host systemd[1]: Started The Apache HTTP Server.
끝 부분에서 볼 수 있듯이 이로 인해 Apache 서버가 다시 시작됩니다... 중지되는 UID는 Apache가 사용하는 사용자이기 때문입니다(이는아니요기본 www-data), 이것이 문제입니다. 이 오류의 원인은 무엇입니까?