Difference between revisions of "Daemons"

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A [[Wikipedia:Daemon (computing)|daemon]] is a program that runs in the background, waiting for events to occur and offering services. A good example is a web server that waits for a request to deliver a page or a ssh server waiting for someone trying to log in. While these are full featured applications, there are daemons whose work is not that visible. Daemons are for tasks like writing messages into a log file (e.g. {{ic|syslog}}, {{ic|metalog}}) or keeping your system time accurate (e.g. [[Network Time Protocol daemon|{{ic|ntpd}}]]).
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[[zh-hans:Daemons]]
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A [[Wikipedia:Daemon (computing)|daemon]] is a program that runs as a "background" process (without a terminal or user interface), commonly waiting for events to occur and offering services. A good example is a web server that waits for a request to deliver a page, or a ssh server waiting for someone trying to log in. While these are full featured applications, there are daemons whose work is not that visible. Daemons are for tasks like writing messages into a log file (e.g. {{ic|syslog}}, {{ic|metalog}}) or keeping your system time accurate (e.g. [[ntpd]]). For more information see {{man|7|daemon}}.
  
{{Note|The word daemon is sometimes used for a class of programs that are started at boot but have no process which remains in memory.  They are called daemons simply because they utilize the same startup/shutdown framework (e.g. {{ic|/etc/rc.d/}} scripts) used to start traditional daemons. For example, the {{ic|/etc/rc.d}} scripts for {{ic|alsa}} and {{ic|cpufreq}} provide persistent configuration support for their perspective kernel modules but do not start additional background processes to service requests or respond to events.
+
In Arch Linux, daemons are managed by [[systemd]]. The [[systemctl]] command is the user interface used to manage them. It reads {{ic|''name''.service}} files that contain information about how and when to start the associated daemon. Service files are stored in {{ic|/{etc,usr/lib,run}/systemd/system}}. See [[systemd#Using units]] for details.
  
From the user's perspective the distinction is typically not significant unless the user tries to look for the "daemon" in a process list.
+
== List of daemons ==
}}
 
  
==Starting on Boot==
+
{{Remove|Needlessly duplicates other articles, instead categorize these articles with [[:Category:Daemons]], creating redirects if necessary.}}
A default install of Arch Linux will leave you with very few services (or daemons) enabled during boot. You can add or remove services by editing the {{ic|DAEMONS}} array in your [[rc.conf]] file. It will initially look something like this:
+
{{Accuracy|shadow doesn't appear to be a daemon.}}
DAEMONS=(syslog-ng network netfs crond)
 
  
They will start in the order you have them listed. You can disable one and keep it in the array by prefixing it with an exclamation mark ({{ic|!}}). You can also have them start in the background by adding the {{ic|@}} symbol in front of it.
+
Here is a list of daemons. Note that any package can provide a daemon, so this list will never be complete. Please feel free to add any missing daemons here, in alphabetical order. You may have packages that include other daemons from the [[AUR]]. These files will likely be located in {{ic|/usr/lib/systemd/system/}}.
 +
 +
The ''Package'' column contains a link to ArchWiki page for each daemon (or link to the package if no such page exists). The ''initscripts'' column contains the name of the legacy ''rc.d'' script and the ''systemd'' column contains the name of the [[systemd]] service file. Note that there may be daemons specific to either initscripts or systemd, with the respective column empty. The ''Description'' column provides short description, preferably of ''the daemon'' (not of the package).
  
Daemon scripts are stored in {{ic|/etc/rc.d/}}. You can print the list of all the available daemons on your system, along with their current status, with:
+
{| class="wikitable sortable"
$ rc.d list
+
! Package !! initscripts !! systemd !! Description
 
+
|-
===[[Systemd]] Systems===
+
| [[acpid]] || acpid || acpid.service || A daemon for delivering ACPI power management events with netlink support.
 
+
|-
To see a list of running units (some of which will be daemons, amongst other things), type:
+
| [[alsa]] || alsa || ''always on'' – alsa-store.service, alsa-restore.service || Saves the state of a sound card (e.g. volume) on shutdown and restores it on startup.
$ systemctl list-units
+
|-
To see all available ones, add {{ic| --all}} to the end of a command.
+
| {{Pkg|at}} || atd || atd.service || Runs jobs queued for later execution.
 
+
|-
To start a daemon, use:
+
| [[Autofs]] || autofs || autofs.service || Automounting of removable media or network shares when they are inserted or accessed.
# systemctl start <name>.service
+
|-
 
+
| rowspan="2" | [[Avahi]] || avahi-daemon || avahi-daemon.service || Allows programs to automatically find local network services.
To enable it at boot, in the above replace {{ic|start}} with {{ic|enable}}.
+
|-
 
+
|                            avahi-dnsconfd || avahi-dnsconfd.service || Multicast/unicast DNS-SD framework.
The counter-parts to the previous commands are {{ic|stop}} and {{ic|disable}}.
+
|-
 
+
| [[Audit framework]] || auditd || auditd.service || Linux audit framework
==Performing daemon actions manually==
+
|-
Every daemon has a series of actions that can be called with specific commands: usually there are at least {{ic|start}}, {{ic|stop}}, and {{ic|restart}}. You can issue each with:
+
| [[Bitlbee]] || bitlbee || bitlbee.service || Brings instant messaging (XMPP, Yahoo!, ICQ, Twitter) to IRC.
# /etc/rc.d/''daemon-name'' {start|stop|restart|...}
+
|-
A completely equivalent way is:
+
| [[Bluetooth]] || bluetooth || bluetooth.service || Bluetooth protocol stack, framework, subsystem.
# rc.d {start|stop|restart|...} ''daemon-name-1'' ''daemon-name-2'' ''daemon-name-3'' ...
+
|-
which, as it is clear from the example, works also with a list of daemons, calling for each the given action.
+
| [[Chrony]] || chrony || chrony.service || Lightweight NTP client and server.
 
+
|-
For a list of all the available commands for a specific daemon, check its documentation, or just open the script in a text viewer.
+
| [[CDemu]] || cdemud || cdemu-daemon.service || CD/DVD-ROM device emulator.
 
+
|-
==Essentials==
+
| [[ClamAV]] || clamav || clamd.service <br>freshclamd.service || Anti-virus toolkit for Unix.
You do not have to add any more services, if you do not feel the need. However, a typical desktop user will add at least [[CUPS]] and [[dbus]]. As you install new services, you will have to manually add them to the {{ic|DAEMONS}} array in {{ic|/etc/rc.conf}} (located at the very end).
+
|-
 
+
| [[ConnMan]] || connmand || connman.service || Wireless LAN network manager.
==Starting Daemons in Background==
+
|-
This is helpful for starting a service and letting the next service start before the previous one has finished. Which services to start background depends on your needs. Do not background anything you need immediately. Here is an example:
+
| [[Cpupower]] || cpupower || cpupower.service || Sets [[cpufreq]] governor and other parameters on startup.
DAEMONS=(syslog-ng gensplash dbus network netfs @avahi-daemon @samba @crond @openntpd @cupsd @mpd)
+
|-
 
+
| || craftbukkit || craftbukkit.service || CraftBukkit Minecraft server.
Starting {{ic|openntpd}} in the background could lead to synchronization errors between the actual time and the time stored on your computer. If you recognize an increasing time difference between your desktop clock and the actual time, try to start the {{ic|openntpd}} daemon normally and not in the background.
+
|-
 
+
| [[Cron]] || crond || cronie.service (if using {{Pkg|cronie}}) or dcron.service (if using {{AUR|dcron}}) || Daemon to schedule and time events. The daemon name ''crond'' is used by at least two packages, {{Pkg|cronie}} and {{AUR|dcron}}.
==rc.conf GUI front-ends==
+
|-
[[Rc.conf GUI Frontends|rc.conf GUI front-ends]] allow one to easily change settings in {{ic|/etc/rc.conf}} using a graphical application.
+
| [[CUPS]] || cupsd || org.cups.cupsd.service || The CUPS Printing System daemon.
 
+
|-
==List of Daemons==
+
| [[D-Bus]] || dbus || ''always on'' – dbus.service || Freedesktop.org message bus system.
Here is a list of daemons. Note that any package can provide a daemon, so this list will never be complete. Please feel free to add any missing daemons here, in alphabetical order.
+
|-
For each daemon the name of the script (for [[rc.conf|initscripts]]) and of the service (for [[systemd]]) is given.
+
| {{Pkg|dante}} || sockd || sockd.service || A circuit-level SOCKS client/server.
{| border="1"
+
|-
!Initscripts!!Systemd!!Description
+
| rowspan="2" | [[Deluge]] || deluged || deluged.service || Cross-platform and full-featured BitTorrent client - main daemon.
 +
|-
 +
|                            deluge-web || deluge-web.service || Cross-platform and full-featured BitTorrent client - web interface daemon.
 +
|-
 +
| [[Dhcpcd]] || dhcpcd || dhcpcd@.service || DHCP daemon.
 +
|-
 +
| [[Docker]] || docker || docker.service || A container platform.
 +
|-
 +
| [[Dovecot]] || dovecot || dovecot.service || IMAP and POP3 server.  
 +
|-
 +
| [[Dropbox]] || dropboxd || dropbox@.service || Cross-platform file synchronisation with version control.
 +
|-
 +
| [[fail2ban]] || fail2ban || fail2ban.service || Fail2ban scans log files and bans IP addresses that show malicious activity.
 +
|-
 +
| [[Fan speed control]] || fancontrol || fancontrol.service || Fan control daemon (part of lm_sensors)
 +
|-
 +
| [[Fbsplash]] || fbsplash || ''not yet implemented'' || Graphical boot splash screen for the user.
 +
|-
 +
| [[FluidSynth]] || fluidsynth || fluidsynth.service || Software synthesizer.
 +
|-
 +
| {{Pkg|inetutils}} || ftpd || ftpd.service || inetutils FTP daemon.
 +
|-
 +
| [[GDM]] || gdm || gdm.service || GNOME Display Manager.
 +
|-
 +
| [[Git]] || git-daemon || git-daemon.socket || Git daemon.
 +
|-
 +
| [[Console mouse support|gpm]] || gpm || gpm.service || Console mouse support.
 +
|-
 +
| [[hddtemp]] || hddtemp || hddtemp.service || Hard drive temperature monitor daemon.
 +
|-
 +
| || healthd || healthd.service || A daemon which can be used to alert you in the event of a hardware health monitoring alarm (part of [[lm_sensors]]).
 +
|-
 +
| [[apache]] || httpd || httpd.service || Apache HTTP Server (Web Server).
 +
|-
 +
| || i8kmon || i8kmon.service || Monitor the CPU temperature and fan status on Dell Inspiron laptops.
 
|-
 
|-
|[[acpid]]||acpid.service||Delivers ACPI events.
+
| || ifplugd || ifplugd@.service || Start/stop network on network cable plugged in/out.
 
|-
 
|-
|[[Advanced Linux Sound Architecture|alsa]]||alsa-store.service
+
| rowspan="2" | [[iptables]] || iptables || iptables.service || Load firewall rules for IPv4.
alsa-restore.service
 
||Advanced Linux Sound Architecture; provides device drivers for sound cards.
 
 
|-
 
|-
|atd||''not yet implemented''||Run jobs queued for later execution.
+
|                               ip6tables || ip6tables.service || Load firewall rules for IPv6.
 
|-
 
|-
|[[Avahi|avahi-daemon]]||avahi-daemon.service||Allows programs to automatically find local network services.
+
| [[IPFS]] || ipfs daemon || ? || A peer-to-peer hypermedia protocol node
 
|-
 
|-
|[[Avahi|avahi-dnsconfd]]||avahi-dnsconfd.service||
+
| || irqbalance || irqbalance.service || Irqbalance is the Linux utility tasked with making sure that interrupts from your hardware devices are handled in as efficient a manner as possible.
 
|-
 
|-
|[[ClamAV|clamav]]||clamd.service
+
| [[KDE]] || kdm || kdm.service || KDE Display Manager.
freshclamd.service
 
||Antivirus.
 
 
|-
 
|-
|[[CPU_Frequency_Scaling|cpupower]]||cpupower.service||Userspace tools for the kernel cpufreq subsystem
+
| rowspan="3" | {{Pkg|krb5}} || krb5-kadmind || krb5-kadmind.service || Kerberos 5 administration server.
 
|-
 
|-
|craftbukkit||''not yet implemented''||CraftBukkit Minecraft server
+
|                       krb5-kdc || krb5-kdc.service || Kerberos 5 KDC.
 
|-
 
|-
|[[Cron|crond]]||cronie.service||Daemon to schedule and time events. The daemon name ''crond'' is used by at least two packages, {{Pkg|cronie}} and {{Pkg|dcron}}.
+
|                       krb5-kpropd || krb5-kpropd.service || Kerberos 5 propagation server.
 
|-
 
|-
|[[CUPS|cupsd]]||cupsd.service
+
| [[Laptop Mode Tools]] || laptop-mode || laptop-mode.service || Laptop power saving tools.
''or'' cups.service
 
||Common UNIX Printing System daemon.
 
 
|-
 
|-
|[[dbus]]||dbus.service||Message bus system for software communication.
+
| [[lighttpd]] || lighttpd || lighttpd.service || Lighttpd HTTP Server (Web Server).
 
|-
 
|-
|[[Dropbox|dropboxd]]||''not yet implemented''||Cross-platform file synchronisation with version control.
+
| [[libvirt]] || libvirt || libvirtd.service || libvirt is a virtualization API and a daemon for managing virtual machines (VMs).
 
|-
 
|-
|[[FAM|fam]]||''deprecated''||File Alteration Monitor. (deprecated)
+
| [[LXDE|lxdm]] || lxdm || lxdm.service || LXDE Display Manager.
 
|-
 
|-
|fancontrol||fancontrol.service||Fan control daemon (part of lm_sensors)
+
| {{Pkg|man-db}} || ? || man-db.timer
 +
 
 +
man-db.service
 +
 
 +
|| Daily man-db cache update.
 
|-
 
|-
|[[Fbsplash|fbsplash]]||''not yet implemented''||Graphical boot splash screen for the user.
+
| || mdadm || mdadm.service || MD Administration (Linux software RAID).
 
|-
 
|-
|ftpd||''not yet implemented''||Inetutils ftp daemon
+
| [[miniDLNA]] || minidlna || minidlna.service || simple DLNA/UPnP media server.
 
|-
 
|-
|[[GDM|gdm]]||gdm.service ''(in community/systemd-arch-units)''||Gnome Display Manager (Login Screen)
+
| || ? || ModemManager.service || Makes mobile broadband (3G) modem available to [[NetworkManager]].
 
|-
 
|-
|[[Git|git-daemon]]||''not yet implemented''||GIT daemon
+
| [[mpd]] || mpd || mpd.service || Music Player Daemon.
 
|-
 
|-
|[[Console Mouse Support|gpm]]||gpm.service||Console mouse support.
+
| [[MariaDB]] || mysqld || mysqld.service || MySQL database server.
 
|-
 
|-
|[[HAL|hal]]||''deprecated''||Hardware Abstraction Layer. (Deprecated)
+
| [[MythTV]] || mythbackend || mythbackend.service || Back-end for the MythTV digital video recording/home theater software.
 
|-
 
|-
|hddtemp||hddtemp.service||Hard drive temperature monitor daemon
+
| [[BIND]] || named || named.service || The Berkeley Internet Name Daemon (BIND) DNS server.
 
|-
 
|-
|healthd||healthd.service||A daemon which can be used to alert you in the event of a hardware health monitoring alarm (part of lm_sensors).
+
| rowspan="3" | [[netctl]] || || netctl@.service || Manually activate specific profile.
 
|-
 
|-
 +
|                            || netctl-ifplugd@.service || Automatically start/stop netctl profiles depending on whether the cable is plugged in or not.
 
|-
 
|-
|iptables||iptables.service||Load firewall rules.
+
|                             || netctl-auto@.service || Automatically start/stop netctl wireless profiles depending on which access points are in range.
 
|-
 
|-
 +
| || network || dhcpcd@.service || Brings up the network connections (dynamic Ethernet).
 
|-
 
|-
|ip6tables||ip6tables.service||Load firewall rules for ipv6.
+
| [[NetworkManager]] || networkmanager || NetworkManager.service <br>NetworkManager-wait-online.service || NetworkManager daemon, provides configuration and detection for automatic network connections.
 
|-
 
|-
|[[LAMP|httpd]]||''not yet implemented''
+
| [[Nginx]] || nginx || nginx.service || Nginx HTTP Server and IMAP/POP3 proxy server (Web Server).
See [[Systemd/Services#apache2]] for manual configuration.
 
||Apache HTTP Server (Web Server)
 
 
|-
 
|-
|[[hwclock]]||||Not a daemon as such, but on shutdown, updates hwclock to compensate for drift. Only run this daemon if ntpd is not running as both daemons adjust the hardware clock.
+
| {{Pkg|glibc}} || nscd || nscd.service || Name service caching daemon.
 
|-
 
|-
|irqbalance||''not yet implemented''||Irqbalance is the Linux utility tasked with making sure that interrupts from your hardware devices are handled in as efficient a manner as possible.
+
| [[ntpd]] || ntpd || ntpd.service || Network Time Protocol daemon (client and server).
 
|-
 
|-
|[[KDE|kdm]]||kdm.service||KDE Display Manager (Graphical Login)
+
| [[Ntop]] || ntop || ntop.service || Ntop is a network traffic probe based on libcap.
 
|-
 
|-
|krb5-kadmind||krb5-kadmind.service||Kerberos 5 administration server
+
| [[OpenNTPD]] || openntpd || openntpd.service || Alternative Network Time Protocol daemon (client and server).
 
|-
 
|-
|krb5-kdc||krb5-kdc.service||Kerberos 5 KDC
+
| || osspd || osspd.service || OSS Userspace Bridge.
 
|-
 
|-
|krb5-kpropd||krb5-kpropd.service||Kerberos 5 propagation server
+
| [[OpenVPN]] || openvpn || openvpn@.service || One for each VPN configuration file saved like {{ic|/etc/openvpn/''<profile-name>''.conf}}
 
|-
 
|-
|[[Laptop Mode Tools|laptop-mode]]||laptop-mode-tools.service||Laptop Power Saving Tools
+
| [[OSS]] || oss || oss.service || Open Sound System. Alternative to [[ALSA]].
 
|-
 
|-
|[[lighttpd]]||lighttpd.service||Lighttpd HTTP Server (Web Server).
+
| [[Pdnsd]] || pdnsd || pdnsd.service || Proxy DNS server with permanent caching.
 
|-
 
|-
|mdadm||mdadm.service||MD Administration (Linux Software RAID).
+
| {{Pkg|php-fpm}} || php-fpm || php-fpm.service || FastCGI Process Manager for PHP.
 
|-
 
|-
|[[Music Player Daemon|mpd]]||mpd.service||Music Player Daemon.
+
| [[PostgreSQL]] || postgresql || postgresql.service || PostgreSQL database server.
 
|-
 
|-
|[[MySQL|mysqld]]||mysqld.service||MySQL database server.
+
| [[Postfix]] || postfix || postfix.service || Mail server, which is an alternative to using [[sendmail]].
 
|-
 
|-
|netfs||''unused, handled automatically, see''
+
| [[Postgrey]] || postgrey || postgrey.service || Greylisting service, used with Postfix
remote-fs.service
 
''to manually execute scripts''
 
||Mounts network file systems.
 
 
|-
 
|-
|[[Netcfg|net-auto-wired]]||net-auto-wired.service||Netcfg replacement for {{ic|network}} - connects to wired network
+
| [[PPTP server]] || pptpd || pptpd.service || A Virtual Private Network (VPN) server using the Point-to-Point Tunneling Protocol (PPTP).
 
|-
 
|-
|[[Netcfg|net-auto-wireless]]||net-auto-wireless.service||Netcfg replacement for {{ic|network}} - connects to wireless network
+
| [[pppd]] || pppd || ppp@.service || A daemon which implements the Point-to-Point Protocol for dial-up networking.
 
|-
 
|-
|[[Netcfg|net-profiles]]||netcfg.service||Netcfg replacement for {{ic|network}} - connects to profiles
+
| [[preload]] || preload || preload.service || Makes applications run faster by prefetching binaries and shared objects.
 
|-
 
|-
|[[Configuring_Network|network]]||''(dynamic Ethernet)'' dhcpcd@.service||To bring up the network connections.
+
| [[Prosody]] || prosody || prosody.service || XMPP server.
 
|-
 
|-
|[[NetworkManager|networkmanager]]||NetworkManager.service
+
| [[Profile-sync-daemon]] || psd || psd.service || Manages your browser's profile in tmpfs and periodically syncs it back to your physical disk.
NetworkManager-wait-online.service
 
||Replaces {{ic|network}}, and provides configuration and detection for automatic network connections.
 
 
|-
 
|-
|[[Nginx|nginx]]||nginx.service||Nginx HTTP Server and IMAP/POP3 proxy server (Web Server)
+
| || pure-ftpd || pure-ftpd.servicecups.service || A fast, production quality, standards-compliant FTP server.
 
|-
 
|-
|nscd||nscd.service||Name service cache daemon
+
| [[Rsync]] || rsyncd || rsyncd.service || rsync daemon.
 
|-
 
|-
|[[Network Time Protocol daemon|ntpd]]||ntpd.service||Network Time Protocol daemon (client and server).
+
| [[Rsyslog]] || rsyslogd || rsyslog.service || Alternative system logger.
 
|-
 
|-
|[[OpenNTPD|openntpd]]||openntpd.service||alternate Network Time Protocol daemon (client and server).
+
| [[Redis]] || redis-server || redis.service || Key-value store
 
|-
 
|-
|[[Nginx#1st_Method_.22New.22_.28as_of_PHP_5.3.3.29|php-fpm]]||||FastCGI Process Manager for PHP
+
| [[samba]] || samba || smb.service<br>nmb.service<br>winbind.service || File and print services for Microsoft Windows clients.
 
|-
 
|-
|[[PostgreSQL|postgresql]]||postgresql.service||PostgreSQL database server.
+
| [[LVM]] || ? || blk-availability.service<br>lvm2-lvmetad.service<br>lvm2-monitor.service<br>lvm2-pvscan.service || LVM is a logical volume manager for the Linux kernel; it manages disk drives and similar mass-storage devices.
 
|-
 
|-
|[[powernowd]]||''not yet implemented''||To adjust speed of CPU depending on system load. See also [[CPU Frequency Scaling]]
+
| [[SANE]] || saned || saned@.service || SANE network daemon.
 
|-
 
|-
|ppp||''not yet implemented''||A daemon which implements the Point-to-Point Protocol for dial-up networking.
+
| || saslauthd || saslauthd.service || SASL authentication daemon.
 
|-
 
|-
|[[preload]]||preload.service||Makes applications run faster by prefetching binaries and shared objects.
+
| rowspan="2" | [[lm_sensors]] || sensord || sensord.service || Sensor information logging daemon.
 
|-
 
|-
|pure-ftpd||''not yet implemented''||FTP server.
+
|                                 sensors || lm_sensors.service || Initialize hardware monitoring sensors (load necessary kernel modules).
 
|-
 
|-
|[[readahead]]||systemd-readahead-collect.service
+
| {{Pkg|shadow}} || ? || shadow.timer
systemd-readahead-done.service
+
shadow.service
 
+
|| Daily verification of password and group files.
systemd-readahead-drop.service
 
 
 
systemd-readahead-replay.service
 
||Readahead for faster boot
 
 
|-
 
|-
||rfkill||rfkill.service||(Un)block radio devices. (.service does not seem to provide equivalent functionality.)
+
| [[SLiM]] || slim || slim.service || Simple Login Manager.
 
|-
 
|-
|[[Rsync|rsyncd]]||rsyncd.service||Rsync daemon.
+
| [[SMART]] || smartd || smartd.service || Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) Hard Disk Monitoring.
 
|-
 
|-
|[[Rsyslog|rsyslogd]]||rsyslog.service||The latest version of a system logger.
+
| [[Samba#smbnetfs|smbnetfs]] || smbnetfs || smbnetfs.service || Automatically mount Samba/Microsoft network shares.
 
|-
 
|-
|[[samba]]||smbd.service
+
| [[snmpd]] || snmpd || snmpd.service || A suite of applications used to implement SNMP
nmbd.service
 
 
 
winbindd.service
 
||File and print services for Microsoft Windows clients.
 
 
|-
 
|-
|[[USB_Scanner_Support|saned]]||saned@.service||To share the scanner system over network.
+
| || soundmodem || soundmodem.service || Multiplatform Soundcard Packet Radio Modem
 
|-
 
|-
|sensord||sensord.service||Sensor information logging daemon (part of lm_sensors)
+
| {{Pkg|spamassassin}} || spamd || spamassassin.service || e-mail spam filtering service.
 
|-
 
|-
|[[Lm sensors|sensors]]||lm_sensors.service||Hardware (temperature, fans etc) monitoring.
+
| [[OpenSSH]] || sshd || sshd.service || OpenSSH (secure shell) daemon.
 
|-
 
|-
|[[SLiM|slim]]||slim.service||Simple Login Manager
+
|{{pkg|stunnel}} || stunnel || stunnel.service || Allows encrypting arbitrary TCP connections inside SSL.
 
|-
 
|-
|[[SMART|smartd]]||smartd.service||Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T) Hard Disk Monitoring
+
|[[subversion]] || svnserve || svnserve.service || Subversion server.
 
|-
 
|-
|snmpd||''not yet implemented''||A suite of applications used to implement SNMP
+
| [[syslog-ng]] || syslog-ng || syslog-ng.service || System logger next generation.
 
|-
 
|-
|soundmodem||''not yet implemented''||Multiplatform Soundcard Packet Radio Modem
+
| [[Timidity]] || timidity++ || timidity.service || Software synthesizer for MIDI.
 
|-
 
|-
|[[Secure Shell|sshd]]||sshd.service
+
| [[Tinc]] || ? || tincd@.service || One for each configuration directory like /etc/tinc/''<vpnname>''/
sshd@.service
 
 
 
sshdgenkeys.service
 
||OpenSSH (secure shell) daemon.
 
 
|-
 
|-
|stbd||''deprecated''||This daemon was previously necessary for gnome-system-tools.  However, as of gnome-tools 2.28, it is no longer needed.
+
| [[Tor]] || tor || tor.service || Onion routing for anonymous communication.
 
|-
 
|-
|svnserve||svnserve.service||Subversion server
+
|[[Transmission]] || transmissiond || transmission.service || BitTorrent Daemon.
 
|-
 
|-
|syslogd||''deprecated''||This was the older and basic system logger.
+
| [[Ufw]] || ufw || ufw.service || Uncomplicated FireWall.
 
|-
 
|-
|[[syslog-ng]]||syslog-ng.service||System logger next generation.
+
| [[Urxvt|Urxvtd]] || ? || urxvtd.service || urxvt daemon.
 
|-
 
|-
|[[Timidity|timidity++]]||''not yet implemented''||Software synthesizer for MIDI.
+
| [[VirtualBox]] || vboxservice || vboxservice.service || VirtualBox Guest Service.
 
|-
 
|-
|[[VirtualBox|vboxservice]]||vboxservice.service||VirtualBox Guest Service
+
| [[vnStat]] || vnstat || vnstat.service || Lightweight network traffic monitor.
 
|-
 
|-
|[[Very Secure FTP Daemon|vsftpd]]||vsftpd.service
+
| [[Very Secure FTP Daemon]] || vsftpd || vsftpd.service (permanent)
vsftpd@.service
 
  
vsftpd-ssl.service
+
vsftpd.socket (on-demand)
||FTP server.
+
 
 +
vsftpd-ssl.service (permanent)
 +
 
 +
vsftpd-ssl.socket (on-demand)
 +
|| FTP server.
 
|-
 
|-
|[[wicd]]||wicd.service||Combine with dbus to replace {{ic|network}}, a lightweight alternative to NetworkManager.
+
| [[wicd]] || wicd || wicd.service || A lightweight alternative to NetworkManager.
 
|-
 
|-
|[[x11vnc]]||''not yet implemented''||VNC remote desktop daemon  
+
| [[x11vnc]] || x11vnc || x11vnc.service || VNC remote desktop daemon.
 
|-
 
|-
 +
| [[XDM]] || xdm || xdm.service || X display manager.
 +
|-
 +
| [[XDM|xdm-archlinux]] || xdm-archlinux || xdm-archlinux.service || X display manager with Arch Linux theme.
 
|}
 
|}
 
==See also==
 
* [[rc.conf|Initscripts]]
 
* [[Systemd]]
 
* Examples for [[writing rc.d scripts]]
 
* Examples for writing [[Systemd/Services]]
 

Latest revision as of 18:40, 25 May 2019

A daemon is a program that runs as a "background" process (without a terminal or user interface), commonly waiting for events to occur and offering services. A good example is a web server that waits for a request to deliver a page, or a ssh server waiting for someone trying to log in. While these are full featured applications, there are daemons whose work is not that visible. Daemons are for tasks like writing messages into a log file (e.g. syslog, metalog) or keeping your system time accurate (e.g. ntpd). For more information see daemon(7).

In Arch Linux, daemons are managed by systemd. The systemctl command is the user interface used to manage them. It reads name.service files that contain information about how and when to start the associated daemon. Service files are stored in /{etc,usr/lib,run}/systemd/system. See systemd#Using units for details.

List of daemons

Tango-edit-cut.pngThis section is being considered for removal.Tango-edit-cut.png

Reason: Needlessly duplicates other articles, instead categorize these articles with Category:Daemons, creating redirects if necessary. (Discuss in Talk:Daemons#)

Tango-inaccurate.pngThe factual accuracy of this article or section is disputed.Tango-inaccurate.png

Reason: shadow doesn't appear to be a daemon. (Discuss in Talk:Daemons#)

Here is a list of daemons. Note that any package can provide a daemon, so this list will never be complete. Please feel free to add any missing daemons here, in alphabetical order. You may have packages that include other daemons from the AUR. These files will likely be located in /usr/lib/systemd/system/.

The Package column contains a link to ArchWiki page for each daemon (or link to the package if no such page exists). The initscripts column contains the name of the legacy rc.d script and the systemd column contains the name of the systemd service file. Note that there may be daemons specific to either initscripts or systemd, with the respective column empty. The Description column provides short description, preferably of the daemon (not of the package).

Package initscripts systemd Description
acpid acpid acpid.service A daemon for delivering ACPI power management events with netlink support.
alsa alsa always on – alsa-store.service, alsa-restore.service Saves the state of a sound card (e.g. volume) on shutdown and restores it on startup.
at atd atd.service Runs jobs queued for later execution.
Autofs autofs autofs.service Automounting of removable media or network shares when they are inserted or accessed.
Avahi avahi-daemon avahi-daemon.service Allows programs to automatically find local network services.
avahi-dnsconfd avahi-dnsconfd.service Multicast/unicast DNS-SD framework.
Audit framework auditd auditd.service Linux audit framework
Bitlbee bitlbee bitlbee.service Brings instant messaging (XMPP, Yahoo!, ICQ, Twitter) to IRC.
Bluetooth bluetooth bluetooth.service Bluetooth protocol stack, framework, subsystem.
Chrony chrony chrony.service Lightweight NTP client and server.
CDemu cdemud cdemu-daemon.service CD/DVD-ROM device emulator.
ClamAV clamav clamd.service
freshclamd.service
Anti-virus toolkit for Unix.
ConnMan connmand connman.service Wireless LAN network manager.
Cpupower cpupower cpupower.service Sets cpufreq governor and other parameters on startup.
craftbukkit craftbukkit.service CraftBukkit Minecraft server.
Cron crond cronie.service (if using cronie) or dcron.service (if using dcronAUR) Daemon to schedule and time events. The daemon name crond is used by at least two packages, cronie and dcronAUR.
CUPS cupsd org.cups.cupsd.service The CUPS Printing System daemon.
D-Bus dbus always on – dbus.service Freedesktop.org message bus system.
dante sockd sockd.service A circuit-level SOCKS client/server.
Deluge deluged deluged.service Cross-platform and full-featured BitTorrent client - main daemon.
deluge-web deluge-web.service Cross-platform and full-featured BitTorrent client - web interface daemon.
Dhcpcd dhcpcd dhcpcd@.service DHCP daemon.
Docker docker docker.service A container platform.
Dovecot dovecot dovecot.service IMAP and POP3 server.
Dropbox dropboxd dropbox@.service Cross-platform file synchronisation with version control.
fail2ban fail2ban fail2ban.service Fail2ban scans log files and bans IP addresses that show malicious activity.
Fan speed control fancontrol fancontrol.service Fan control daemon (part of lm_sensors)
Fbsplash fbsplash not yet implemented Graphical boot splash screen for the user.
FluidSynth fluidsynth fluidsynth.service Software synthesizer.
inetutils ftpd ftpd.service inetutils FTP daemon.
GDM gdm gdm.service GNOME Display Manager.
Git git-daemon git-daemon.socket Git daemon.
gpm gpm gpm.service Console mouse support.
hddtemp hddtemp hddtemp.service Hard drive temperature monitor daemon.
healthd healthd.service A daemon which can be used to alert you in the event of a hardware health monitoring alarm (part of lm_sensors).
apache httpd httpd.service Apache HTTP Server (Web Server).
i8kmon i8kmon.service Monitor the CPU temperature and fan status on Dell Inspiron laptops.
ifplugd ifplugd@.service Start/stop network on network cable plugged in/out.
iptables iptables iptables.service Load firewall rules for IPv4.
ip6tables ip6tables.service Load firewall rules for IPv6.
IPFS ipfs daemon ? A peer-to-peer hypermedia protocol node
irqbalance irqbalance.service Irqbalance is the Linux utility tasked with making sure that interrupts from your hardware devices are handled in as efficient a manner as possible.
KDE kdm kdm.service KDE Display Manager.
krb5 krb5-kadmind krb5-kadmind.service Kerberos 5 administration server.
krb5-kdc krb5-kdc.service Kerberos 5 KDC.
krb5-kpropd krb5-kpropd.service Kerberos 5 propagation server.
Laptop Mode Tools laptop-mode laptop-mode.service Laptop power saving tools.
lighttpd lighttpd lighttpd.service Lighttpd HTTP Server (Web Server).
libvirt libvirt libvirtd.service libvirt is a virtualization API and a daemon for managing virtual machines (VMs).
lxdm lxdm lxdm.service LXDE Display Manager.
man-db ? man-db.timer

man-db.service

Daily man-db cache update.
mdadm mdadm.service MD Administration (Linux software RAID).
miniDLNA minidlna minidlna.service simple DLNA/UPnP media server.
? ModemManager.service Makes mobile broadband (3G) modem available to NetworkManager.
mpd mpd mpd.service Music Player Daemon.
MariaDB mysqld mysqld.service MySQL database server.
MythTV mythbackend mythbackend.service Back-end for the MythTV digital video recording/home theater software.
BIND named named.service The Berkeley Internet Name Daemon (BIND) DNS server.
netctl netctl@.service Manually activate specific profile.
netctl-ifplugd@.service Automatically start/stop netctl profiles depending on whether the cable is plugged in or not.
netctl-auto@.service Automatically start/stop netctl wireless profiles depending on which access points are in range.
network dhcpcd@.service Brings up the network connections (dynamic Ethernet).
NetworkManager networkmanager NetworkManager.service
NetworkManager-wait-online.service
NetworkManager daemon, provides configuration and detection for automatic network connections.
Nginx nginx nginx.service Nginx HTTP Server and IMAP/POP3 proxy server (Web Server).
glibc nscd nscd.service Name service caching daemon.
ntpd ntpd ntpd.service Network Time Protocol daemon (client and server).
Ntop ntop ntop.service Ntop is a network traffic probe based on libcap.
OpenNTPD openntpd openntpd.service Alternative Network Time Protocol daemon (client and server).
osspd osspd.service OSS Userspace Bridge.
OpenVPN openvpn openvpn@.service One for each VPN configuration file saved like /etc/openvpn/<profile-name>.conf
OSS oss oss.service Open Sound System. Alternative to ALSA.
Pdnsd pdnsd pdnsd.service Proxy DNS server with permanent caching.
php-fpm php-fpm php-fpm.service FastCGI Process Manager for PHP.
PostgreSQL postgresql postgresql.service PostgreSQL database server.
Postfix postfix postfix.service Mail server, which is an alternative to using sendmail.
Postgrey postgrey postgrey.service Greylisting service, used with Postfix
PPTP server pptpd pptpd.service A Virtual Private Network (VPN) server using the Point-to-Point Tunneling Protocol (PPTP).
pppd pppd ppp@.service A daemon which implements the Point-to-Point Protocol for dial-up networking.
preload preload preload.service Makes applications run faster by prefetching binaries and shared objects.
Prosody prosody prosody.service XMPP server.
Profile-sync-daemon psd psd.service Manages your browser's profile in tmpfs and periodically syncs it back to your physical disk.
pure-ftpd pure-ftpd.servicecups.service A fast, production quality, standards-compliant FTP server.
Rsync rsyncd rsyncd.service rsync daemon.
Rsyslog rsyslogd rsyslog.service Alternative system logger.
Redis redis-server redis.service Key-value store
samba samba smb.service
nmb.service
winbind.service
File and print services for Microsoft Windows clients.
LVM ? blk-availability.service
lvm2-lvmetad.service
lvm2-monitor.service
lvm2-pvscan.service
LVM is a logical volume manager for the Linux kernel; it manages disk drives and similar mass-storage devices.
SANE saned saned@.service SANE network daemon.
saslauthd saslauthd.service SASL authentication daemon.
lm_sensors sensord sensord.service Sensor information logging daemon.
sensors lm_sensors.service Initialize hardware monitoring sensors (load necessary kernel modules).
shadow ? shadow.timer

shadow.service

Daily verification of password and group files.
SLiM slim slim.service Simple Login Manager.
SMART smartd smartd.service Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) Hard Disk Monitoring.
smbnetfs smbnetfs smbnetfs.service Automatically mount Samba/Microsoft network shares.
snmpd snmpd snmpd.service A suite of applications used to implement SNMP
soundmodem soundmodem.service Multiplatform Soundcard Packet Radio Modem
spamassassin spamd spamassassin.service e-mail spam filtering service.
OpenSSH sshd sshd.service OpenSSH (secure shell) daemon.
stunnel stunnel stunnel.service Allows encrypting arbitrary TCP connections inside SSL.
subversion svnserve svnserve.service Subversion server.
syslog-ng syslog-ng syslog-ng.service System logger next generation.
Timidity timidity++ timidity.service Software synthesizer for MIDI.
Tinc ? tincd@.service One for each configuration directory like /etc/tinc/<vpnname>/
Tor tor tor.service Onion routing for anonymous communication.
Transmission transmissiond transmission.service BitTorrent Daemon.
Ufw ufw ufw.service Uncomplicated FireWall.
Urxvtd ? urxvtd.service urxvt daemon.
VirtualBox vboxservice vboxservice.service VirtualBox Guest Service.
vnStat vnstat vnstat.service Lightweight network traffic monitor.
Very Secure FTP Daemon vsftpd vsftpd.service (permanent)

vsftpd.socket (on-demand)

vsftpd-ssl.service (permanent)

vsftpd-ssl.socket (on-demand)

FTP server.
wicd wicd wicd.service A lightweight alternative to NetworkManager.
x11vnc x11vnc x11vnc.service VNC remote desktop daemon.
XDM xdm xdm.service X display manager.
xdm-archlinux xdm-archlinux xdm-archlinux.service X display manager with Arch Linux theme.