72 lines
2.9 KiB
Text
72 lines
2.9 KiB
Text
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daemons backgrounding,
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Nico Schottelius 2005-06-12 (Last Modified: 2005-10-15)
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0. Definition
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A daemon is a program which runs in the background, not having a tty
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associated necesserally. Running in background does not mean it has
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to background (fork()) itself, but that you cannot control it directly
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from a shell.
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1. Daemons and cinit
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Respawning daemons is a bit more difficult, as daemons do often fork()
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(go to background, the calling process exits).
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This way cinit cannot watch it directly.
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The first solution is to check the documentation of your daemon program,
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if it has a switch to disable forking
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The following daemons / servers are known to avoid backgrounding easily:
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acpid [x86 power management]: -f (undocumentated but works)
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apache [webserver]: -DFOREGROUND
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asterisk [pbx]: -f
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bind [dns server/caching]: -f
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cardmgr [pcmcia/cardbus]: -f
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cron (vixie) [schedular]: -f
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cupsd [printer server]: -f or -F
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dhclient [dhcp client]: -d
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dhcp3 (isc) [dhcp server]: -f
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distccd [compile server]: normal behaviour
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fam [file alteration monitor]:-f
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fcron [schedular]: -f
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frox [ftp proxy]: "NoDetach" in config
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gdm [display manager]: -nodaemon
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hybrid [irc server]: -foreground
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icecast2 [sound streamer]: normal behaviour
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mini-lpd [printer server]: normal behaviour
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metalog [log server]: normal behaviour
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monotone [vcs]: normal behaviour
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mpd [music server]: --no-daemon
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nessusd ["security server"]: normal behaviour
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ntpd [time server]: -n
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oidentd [identd server]: -i
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oops [http proxy]: normal behaviour
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openssh [ssh server]: -D
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openvpn [vpn server]: normal behaviour
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pbbuttonsd [power management]:normal behaviour
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proftpd [ftp server]: -n
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qmail [mta]: normal behaviour
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rsync ["file server"]: --no-detach
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silcd ["secure chat server"]: -F, --foreground
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slapd [ldap]: -d
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snmpd [snmp daemon]: -f
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svnserve [vcs]: --foreground
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syslogd [log server]: -n
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syslog-ng [log server]: -F
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tcpserver [super server]: normal behaviour
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udhcpc [dhcp client]: normal behaviour
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vsftpd [ftp server]: normal behaviour (or: config: background=no)
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xinetd [super server]: -dontfork
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Those are the daemons that do not offer the possibility (as of release 0.2):
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atd (no switch, no configuraton option)
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inetd (some variants)
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nscd (no switch, no configuraton option)
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portmap (only with debug mode)
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