我正在尝试在我的一台运行的设备上设置 FTP 服务器，DietPi并选择proFTPD作为服务器。
我已经安装了该软件并按照我找到的一些设置信息进行操作这里。但后来我注意到该服务没有运行。尝试在via 中找到它后，ps aux | grep proftpd我没有成功。
发出后：systemclt status proftpd.service我得到以下信息：
● proftpd.service - LSB: Starts ProFTPD daemon
Loaded: loaded (/etc/init.d/proftpd; generated)
Active: failed (Result: exit-code) since Tue 2021-04-13 22:58:49 BST; 9s ago
Docs: man:systemd-sysv-generator(8)
Process: 26998 ExecStart=/etc/init.d/proftpd start (code=exited, status=1/FAILURE)
Apr 13 22:58:48 DietPi systemd[1]: Starting LSB: Starts ProFTPD daemon...
Apr 13 22:58:49 DietPi proftpd[26998]: Starting ftp server: proftpd2021-04-13 22:58:49,163 DietPi proftpd[2700
5]: mod_ctrls/0.9.5: error: unable to bind to local socket: Address already in use
Apr 13 22:58:49 DietPi proftpd[26998]: 2021-04-13 22:58:49,242 DietPi proftpd[27005]: error: unable to stat()
/var/log/proftpd: No such file or directory
Apr 13 22:58:49 DietPi proftpd[26998]: 2021-04-13 22:58:49,244 DietPi proftpd[27005]: mod_ctrls/0.9.5: unable
to open ControlsLog '/var/log/proftpd/controls.log': No such file or directory
Apr 13 22:58:49 DietPi proftpd[26998]: 2021-04-13 22:58:49,246 DietPi proftpd[27005]: fatal: ControlsLog: unab
le to open '/var/log/proftpd/controls.log': No such file or directory on line 68 of '/etc/proftpd/proftpd.conf'
Apr 13 22:58:49 DietPi proftpd[26998]: failed!
Apr 13 22:58:49 DietPi systemd[1]: proftpd.service: Control process exited, code=exited, s
tatus=1/FAILURE
Apr 13 22:58:49 DietPi systemd[1]: proftpd.service: Failed with result 'exit-code'.
Apr 13 22:58:49 DietPi systemd[1]: Failed to start LSB: Starts ProFTPD daemon.
所以我挖了一点这里结果发现没有其他进程在 port 上运行或绑定21。那么，这里的服务失败可能是什么问题呢？
此外，通过发布sudo lsof -i tcp:21我没有得到任何回应。
另外，通过nmap我得到以下信息：
PORT STATE SERVICE
22/tcp open ssh
53/tcp open domain
80/tcp open http
21/tcp这里没有港口。
proftpd -nd10通过cl进行调试：
roftpd -nd10
2021-04-14 08:13:45,498 DietPi proftpd[951]: using PCRE 8.39 2016-06-14
2021-04-14 08:13:45,508 DietPi proftpd[951]: using TCP receive buffer size of 131072 bytes
2021-04-14 08:13:45,510 DietPi proftpd[951]: using TCP send buffer size of 16384 bytes
2021-04-14 08:13:45,513 DietPi proftpd[951]: testing Unix domain socket using S_ISFIFO
2021-04-14 08:13:45,517 DietPi proftpd[951]: testing Unix domain socket using S_ISSOCK
2021-04-14 08:13:45,519 DietPi proftpd[951]: using S_ISSOCK macro for Unix domain socket detection
2021-04-14 08:13:45,528 DietPi proftpd[951]: mod_ctrls/0.9.5: error: unable to bind to local socket: Address already in use
2021-04-14 08:13:45,532 DietPi proftpd[951]: using 'UTF-8' as local charset for UTF-8 conversion
2021-04-14 08:13:45,535 DietPi proftpd[951]: ROOT PRIVS at mod_core.c:376
2021-04-14 08:13:45,537 DietPi proftpd[951]: RELINQUISH PRIVS at mod_core.c:378
2021-04-14 08:13:45,541 DietPi proftpd[951]: ROOT PRIVS at mod_core.c:385
2021-04-14 08:13:45,544 DietPi proftpd[951]: ROOT PRIVS at parser.c:1187
2021-04-14 08:13:45,549 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_ctrls_admin.c'
2021-04-14 08:13:45,554 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_ctrls_admin' (from '/usr/lib/proftpd/mod_ctrls_admin.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,558 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_tls.c'
2021-04-14 08:13:45,562 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_tls' (from '/usr/lib/proftpd/mod_tls.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,565 DietPi proftpd[951]: mod_tls/2.7: using OpenSSL 1.1.1d 10 Sep 2019
2021-04-14 08:13:45,587 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_radius.c'
2021-04-14 08:13:45,591 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_radius' (from '/usr/lib/proftpd/mod_radius.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,594 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_quotatab.c'
2021-04-14 08:13:45,599 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_quotatab' (from '/usr/lib/proftpd/mod_quotatab.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,602 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_quotatab_file.c'
2021-04-14 08:13:45,607 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_quotatab_file' (from '/usr/lib/proftpd/mod_quotatab_file.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,609 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_quotatab_radius.c'
2021-04-14 08:13:45,612 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_quotatab_radius' (from '/usr/lib/proftpd/mod_quotatab_radius.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,617 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_wrap.c'
2021-04-14 08:13:45,625 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_wrap' (from '/usr/lib/proftpd/mod_wrap.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,628 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_rewrite.c'
2021-04-14 08:13:45,633 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_rewrite' (from '/usr/lib/proftpd/mod_rewrite.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,636 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_load.c'
2021-04-14 08:13:45,639 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_load' (from '/usr/lib/proftpd/mod_load.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,643 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_ban.c'
2021-04-14 08:13:45,648 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_ban' (from '/usr/lib/proftpd/mod_ban.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,651 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_wrap2.c'
2021-04-14 08:13:45,656 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_wrap2' (from '/usr/lib/proftpd/mod_wrap2.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,660 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_wrap2_file.c'
2021-04-14 08:13:45,664 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_wrap2_file' (from '/usr/lib/proftpd/mod_wrap2_file.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,668 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_dynmasq.c'
2021-04-14 08:13:45,673 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_dynmasq' (from '/usr/lib/proftpd/mod_dynmasq.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,675 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_exec.c'
2021-04-14 08:13:45,681 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_exec' (from '/usr/lib/proftpd/mod_exec.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,683 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_shaper.c'
2021-04-14 08:13:45,688 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_shaper' (from '/usr/lib/proftpd/mod_shaper.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,692 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_ratio.c'
2021-04-14 08:13:45,696 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_ratio' (from '/usr/lib/proftpd/mod_ratio.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,699 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_site_misc.c'
2021-04-14 08:13:45,704 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_site_misc' (from '/usr/lib/proftpd/mod_site_misc.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,706 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_sftp.c'
2021-04-14 08:13:45,722 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_sftp' (from '/usr/lib/proftpd/mod_sftp.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,725 DietPi proftpd[951]: mod_sftp/1.0.0: using OpenSSL 1.1.1d 10 Sep 2019
2021-04-14 08:13:45,737 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_sftp_pam.c'
2021-04-14 08:13:45,741 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_sftp_pam' (from '/usr/lib/proftpd/mod_sftp_pam.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,744 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_facl.c'
2021-04-14 08:13:45,749 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_facl' (from '/usr/lib/proftpd/mod_facl.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,752 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_unique_id.c'
2021-04-14 08:13:45,757 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_unique_id' (from '/usr/lib/proftpd/mod_unique_id.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,762 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_copy.c'
2021-04-14 08:13:45,768 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_copy' (from '/usr/lib/proftpd/mod_copy.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,773 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_deflate.c'
2021-04-14 08:13:45,787 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_deflate' (from '/usr/lib/proftpd/mod_deflate.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,789 DietPi proftpd[951]: mod_deflate/0.5.7: using zlib 1.2.11
2021-04-14 08:13:45,792 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_ifversion.c'
2021-04-14 08:13:45,798 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_ifversion' (from '/usr/lib/proftpd/mod_ifversion.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,800 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_memcache.c'
2021-04-14 08:13:45,805 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_memcache' (from '/usr/lib/proftpd/mod_memcache.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,809 DietPi proftpd[951]: mod_memcache/0.1: using libmemcached-1.0.18
2021-04-14 08:13:45,812 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_tls_memcache.c'
2021-04-14 08:13:45,815 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_tls_memcache' (from '/usr/lib/proftpd/mod_tls_memcache.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,815 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_readme.c'
2021-04-14 08:13:45,823 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_readme' (from '/usr/lib/proftpd/mod_readme.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,825 DietPi proftpd[951]: mod_dso/0.5: loading 'mod_ifsession.c'
2021-04-14 08:13:45,831 DietPi proftpd[951]: mod_dso/0.5: loaded module 'mod_ifsession' (from '/usr/lib/proftpd/mod_ifsession.so', last modified on Tue Mar 10 23:03:08 2020)
2021-04-14 08:13:45,835 DietPi proftpd[951]: RELINQUISH PRIVS at parser.c:1190
2021-04-14 08:13:45,838 DietPi proftpd[951]: RELINQUISH PRIVS at mod_core.c:388
2021-04-14 08:13:45,844 DietPi proftpd[951]: DenyFilter: compiling regex '\*.*/'
2021-04-14 08:13:45,857 DietPi proftpd[951]: retrieved UID 1000 for user 'dietpi'
2021-04-14 08:13:45,862 DietPi proftpd[951]: retrieved GID 1000 for group 'dietpi'
2021-04-14 08:13:45,866 DietPi proftpd[951]: <IfModule>: using 'mod_quotatab.c' section at line 53
2021-04-14 08:13:45,868 DietPi proftpd[951]: <IfModule>: using 'mod_ratio.c' section at line 57
2021-04-14 08:13:45,871 DietPi proftpd[951]: <IfModule>: using 'mod_delay.c' section at line 61
2021-04-14 08:13:45,873 DietPi proftpd[951]: <IfModule>: using 'mod_ctrls.c' section at line 65
2021-04-14 08:13:45,874 DietPi proftpd[951]: ROOT PRIVS at mod_ctrls.c:114
2021-04-14 08:13:45,877 DietPi proftpd[951]: RELINQUISH PRIVS at mod_ctrls.c:117
2021-04-14 08:13:45,878 DietPi proftpd[951]: <IfModule>: using 'mod_ctrls_admin.c' section at line 73
2021-04-14 08:13:45,879 DietPi proftpd[951]: ROOT PRIVS at mod_core.c:376
2021-04-14 08:13:45,879 DietPi proftpd[951]: RELINQUISH PRIVS at mod_core.c:378
2021-04-14 08:13:45,879 DietPi proftpd[951]: ROOT PRIVS at mod_core.c:385
2021-04-14 08:13:45,879 DietPi proftpd[951]: processing configuration directory '/etc/proftpd/conf.d/'
2021-04-14 08:13:45,880 DietPi proftpd[951]: RELINQUISH PRIVS at mod_core.c:388
2021-04-14 08:13:45,907 DietPi proftpd[951]: UseReverseDNS off, returning IP address instead of DNS name
2021-04-14 08:13:45,907 DietPi proftpd[951] 127.0.0.1:
2021-04-14 08:13:45,907 DietPi proftpd[951] 127.0.0.1: Config for DietPi FTP:
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: IdentLookups
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: DeferWelcome
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: MultilineRFC2228
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: DefaultServer
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: ShowSymlinks
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: AllowRetrieveRestart
2021-04-14 08:13:45,908 DietPi proftpd[951] 127.0.0.1: AllowStoreRestart
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: TimeoutNoTransfer
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: TimeoutStalled
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: TimeoutIdle
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: DisplayLogin
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: DisplayChdir
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: ListOptions
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: DenyFilter
2021-04-14 08:13:45,909 DietPi proftpd[951] 127.0.0.1: DefaultRoot
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: RootLogin
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: UserID
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: UserName
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: GroupID
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: GroupName
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: Umask
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: DirUmask
2021-04-14 08:13:45,910 DietPi proftpd[951] 127.0.0.1: AllowOverwrite
2021-04-14 08:13:45,911 DietPi proftpd[951] 127.0.0.1: TransferLog
2021-04-14 08:13:45,911 DietPi proftpd[951] 127.0.0.1: SystemLog
2021-04-14 08:13:45,911 DietPi proftpd[951] 127.0.0.1: WtmpLog
2021-04-14 08:13:45,911 DietPi proftpd[951] 127.0.0.1: QuotaEngine
2021-04-14 08:13:45,911 DietPi proftpd[951] 127.0.0.1: Ratios
2021-04-14 08:13:45,911 DietPi proftpd[951] 127.0.0.1: DelayEngine
2021-04-14 08:13:45,912 DietPi proftpd[951] 127.0.0.1: mod_facl/0.6: registered 'facl' FS
2021-04-14 08:13:45,921 DietPi proftpd[951] 127.0.0.1: mod_tls/2.7: generating initial TLS session ticket key
2021-04-14 08:13:45,924 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at mod_tls.c:4815
2021-04-14 08:13:45,927 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at mod_tls.c:4818
2021-04-14 08:13:45,930 DietPi proftpd[951] 127.0.0.1: mod_tls/2.7: scheduling new TLS session ticket key every 3600 secs
2021-04-14 08:13:45,935 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: binding to text domain 'proftpd' using locale path '/usr/share/locale'
2021-04-14 08:13:45,936 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: using locale files in '/usr/share/locale'
2021-04-14 08:13:45,939 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'ko_KR': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,943 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'bg_BG': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,945 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'ja_JP': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,948 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'en_US': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,951 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'fr_FR': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,954 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'es_ES': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,958 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'zh_TW': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,960 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'zh_CN': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,964 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'it_IT': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,968 DietPi proftpd[951] 127.0.0.1: mod_lang/1.1: skipping possible language 'ru_RU': not supported by setlocale(3); see `locale -a'
2021-04-14 08:13:45,971 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at mod_log.c:2151
2021-04-14 08:13:45,974 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at mod_log.c:2154
2021-04-14 08:13:45,976 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at mod_rlimit.c:555
2021-04-14 08:13:45,978 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at mod_rlimit.c:558
2021-04-14 08:13:45,980 DietPi proftpd[951] 127.0.0.1: set core resource limits for daemon
2021-04-14 08:13:45,981 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at mod_auth_unix.c:1338
2021-04-14 08:13:45,986 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at mod_auth_unix.c:1341
2021-04-14 08:13:45,989 DietPi proftpd[951] 127.0.0.1: retrieved group ID: 1000
2021-04-14 08:13:45,991 DietPi proftpd[951] 127.0.0.1: setting group ID: 1000
2021-04-14 08:13:45,993 DietPi proftpd[951] 127.0.0.1: SETUP PRIVS at main.c:2594
2021-04-14 08:13:45,994 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at main.c:1862
2021-04-14 08:13:45,995 DietPi proftpd[951] 127.0.0.1: deleting existing scoreboard '/run/proftpd.scoreboard'
2021-04-14 08:13:45,996 DietPi proftpd[951] 127.0.0.1: opening scoreboard '/run/proftpd.scoreboard'
2021-04-14 08:13:45,998 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at main.c:1889
2021-04-14 08:13:46,002 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at mod_ctrls_admin.c:1632
2021-04-14 08:13:46,002 DietPi proftpd[951] 127.0.0.1: opening scoreboard '/run/proftpd.scoreboard'
2021-04-14 08:13:46,005 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at mod_ctrls_admin.c:1634
2021-04-14 08:13:46,007 DietPi proftpd[951] 127.0.0.1: ROOT PRIVS at inet.c:409
2021-04-14 08:13:46,008 DietPi proftpd[951] 127.0.0.1: RELINQUISH PRIVS at inet.c:459
2021-04-14 08:13:46,009 DietPi proftpd[951] 127.0.0.1: Failed binding to ::, port 21: Address already in use
2021-04-14 08:13:46,011 DietPi proftpd[951] 127.0.0.1: Check the ServerType directive to ensure you are configured correctly
2021-04-14 08:13:46,011 DietPi proftpd[951] 127.0.0.1: Check to see if inetd/xinetd, or another proftpd instance, is already using ::, port 21
2021-04-14 08:13:46,011 DietPi proftpd[951] 127.0.0.1: Unable to start proftpd; check logs for more details
调试通过strace proftpd | grep -E "SOCKET|sock"
getpeername(0, 0xbe8a6c1c, [16]) = -1 ENOTSOCK (Socket operation on non-socket)
socket(AF_UNIX, SOCK_DGRAM, 0) = 3
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) = 4
getsockopt(4, SOL_SOCKET, SO_RCVBUF, [131072], [4]) = 0
getsockopt(4, SOL_SOCKET, SO_SNDBUF, [16384], [4]) = 0
socket(AF_UNIX, SOCK_STREAM, 0) = 4
bind(4, {sa_family=AF_UNIX, sun_path="/run/test.sock"}, 110) = 0
unlink("/run/test.sock") = 0
socket(AF_UNIX, SOCK_STREAM, 0) = 4
bind(4, {sa_family=AF_UNIX, sun_path="/run/proftpd.sock"}, 110) = -1 EADDRINUSE (Address already in use)
write(2, "2021-04-14 11:08:40,739 DietPiHo"..., 1292021-04-14 11:08:40,739 DietPi proftpd[2682]: mod_ctrls/0.9.5: error: unable to bind to local socket: Address already in use
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
connect(6, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
connect(6, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 5
connect(5, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 5
connect(5, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 4
connect(4, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 4
connect(4, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE) = 4
getsockname(4, {sa_family=AF_NETLINK, nl_pid=2682, nl_groups=00000000}, [12]) = 0
socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 4
getsockname(4, {sa_family=AF_INET, sin_port=htons(44402), sin_addr=inet_addr("127.0.0.1")}, [28->16]) = 0
getsockname(4, {sa_family=AF_INET, sin_port=htons(40796), sin_addr=inet_addr("127.0.0.1")}, [28->16]) = 0
socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 4
答案1
输出strace表明该错误是由尝试创建引起的/run/proftpd.sock，该创建显然已经存在。
尝试fuser /run/proftpd.sock查看是否有任何进程正在占用它；它将报告任何此类进程的 PID 号。然后用于ps -fp <PID number here>获取有关相关流程的更多信息。
如果是systemd，您可能需要采取一些措施systemctl stop proftpd.socket; systemctl disable proftpd.socket来摆脱它。 （在这种情况下，DietPi 的默认 ProFTPD 配置可能已定制为systemd使用套接字激活机制 - 本质上是一种可以替代经典inetd/xinetd仅按需运行 FTP 守护进程的机制。由于您似乎希望将 ProFTPD 作为经典的独立服务运行，因此您需要禁用systemd它的套接字。）
如果是其他进程，您可能想要终止它并找出如何防止它再次启动。
但是，如果fuser根本没有列出任何进程，则可能/run/proftpd.sock只是早期测试运行中未正确启动的遗留问题；在这种情况下，请运行rm /run/proftpd.sock并重试systemctl start proftpd.service。