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The following is a brief explanation on usage and recommendations for some (not all) of the different services packaged with Fedora 12.
Please read the guide on managing services in Fedora. This includes an explanation for services/daemons, runlevels and various tools available to manage your services.
To control services either use chkconfig or ntsysv if you are using the command line, or use system-config-services in the GUI. Gnome users: System > Administration > Services. You will require root access to modify services.
The following is a brief explanation on usage and recommendations for services packaged with Fedora 12. This is not an exhaustive list. Be careful, do not disable things that you are not sure if you need or if you do not understand or know what they are.
IT IS NOT RECOMMENDED TO DISABLE THE FOLLOWING (unless you know what you are doing).
haldaemon, messagebus, rsyslogd
Make sure to apply your changes to runlevel 5 *AND* 3.
NetworkManager is a modern service that manages both network devices and network connections. It replaces the older network service. It it highly recommended to leave enabled as default, and leave network disabled. If however you have problems or you prefer the previous network service, then disable NetworkManager and enable the network service. Note that you should make sure your network settings are correct either via system-config-network for the network service, and/or nm-connection-editor for NetworkManager. All note, that to use any modern wireless, mobile broadband, or bluetooth cell phone tethered connection, NetworkManager is required.
This is Fedora's Automatic Bug Reporting Tool. This monitors for a crashed application, collects data and takes some actions (ex: report to Bugzilla, mail the bug report, etc.). If you wish to report crashes this helps, however it is not critical hence I leave it disabled.
Advanced Configuration and Power Interface daemon which controls and allows interfacing to power management and certain input devices. It is recommended to be enabled only if you need it. If you are running a modern graphical desktop (GNOME, KDE) then many ACPI functions should be supported with the acpid daemon. Test disabling it, if you have power management issues (suspend, sleep, wakeup) then re-enable it. If you run without graphics (i.e. runlevel 3) you may find this service necessary for ACPI functions.
anacron, atd, cron
These are schedulers with each having slightly different purposes. It is recommended you keep the general purpose scheduler cron enabled, especially if you keep your computer running for long periods of time. If you are running a server look into which schedulers you require. Most likely atd and anacron should be disabled for desktops/laptops. Please note that some sheduled tasks such as cleaning /tmp or /var may require specific schedulers.
Note: To disable anacron, manually uninstall it: yum remove anacron
This saves audit records generated by the kernel. This information can be used in different ways. SELinux uses the audit daemon to record events. While there are other logging services it is recommended you leave this enabled (especially for users with SELinux enabled). Some information on how to utilize audit can be found on RH Magazine.
Avahi is an implementation of zeroconf and is useful for detecting devices and services on local network without a DNS server. This is also the same as mDNS. Most users may have this disabled. Please note that in order to use the networked audio functionality of Pulse Audio you will need Avahi enabled.
Bluetooth is for portable local wireless devices (NOT wifi,802.11). Some laptops come with bluetooth support. There are bluetooth mice, headsets and cell phone accessories. Most people do not have bluetooth support or devices, and should disable this. Many newer Laptop do include or provide an option for bluetooth.
These services support the automatic seeding and tracking for torrents used by the peer-to-peer networking system BitTorrent. These should be disabled unless you specifically wish to seed or track torrents. By seeding you are essentially sharing the contents of the torrent with others and by tracking you are coordinate the action of other BitTorrent clients. More information from a BitTorrent FAQ. Keep in mind these require network bandwidth and other configuration as well.
This throttles your CPU runtime frequency to save power. Many modern laptop CPU's support this feature and now most new desktops support this. Users should enable only if they are users of Pentium-M, Centrino, AMD PowerNow, Transmetta, Intel SpeedStep, Athlon-64, Athlon-X2, Intel Core 2 hardware. Laptop users are highly recommended to leave this enabled. Disable this if you want your CPU to remain at a fixed state.
Used for printing. These should be enabled only if you have CUPS compatible printer that works in Fedora attached to your computer directly or through a network connection.
This service is specific to Fedora's installation process meant to perform certain tasks that should only be executed once upon booting after installation. Even though it verifies it has been run before (using /etc/sysconfig/firstboot), it can be disabled.
This allows interfacing with certain GPS hardware. Most people will have this disabled.
HAL refers to the Hardware Abstraction Layer. This is a critical service for collecting and maintaing information about hardware from several sources. Fedora requires this, hence leave this enabled.
This is the Apache HTTP Web Server. If you installed this and are doing web development then leave this enabled. However most desktop users and/or non-developers should leave this disabled.
This is the standard Linux software firewall. This is highly recommended if you are directly connected to internet (cable, DSL, T1). It is not required if you use a hardware firewall (D-Link, Netgear, Linksys, etc) but it is still recommended.
This services is the firewall for IPv6 communication. If you have disabled IPv6 then you can disable this. However leaving this enabled, even if you do not use IPv6 should not affect network usage.
IrDA support infrared communications between devices (laptops, PDA's, mobile phones, calculators, etc). This should be disabled for most users.
This service is to increase performance across processors on a multiprocessor system. For users who do not have multiple processors/multiple cores this should be disabled. However newer computers with multi-core CPU's (Intel Core 2 Duo, AMD X2) should enable this. Leaving this enabled will not effect performance on single CPU/single core systems.
This is provided as a helper to directly run java JAR applications. This is will be included if you installed Sun Java. It is not necessary and can be disabled.
This is a monitoring application for your LVM (Logical Volume Management) system. This is recommended if you use LVM, however if you use manually partition your drives it can be disabled.
Is useful for monitoring Software RAID or LVM information. It is not a critical service and may be disabled.
This is an IPC (Interprocess Communication) service for Linux. Specifically this communicates with D-BUS, a critical component. It is highly recommended to leave this enabled.
This is a service that allows special microcode updates to an Intel CPU (Pentium Pro, PII, Celeron, PIII, Xeon, Pentium 4 etc.). These are updates that are written at every boot. This should be enabled only if you have have an Intel brand CPU.
This is used for monitoring Multi-Path devices which are storage devices that can be accessed by more than 1 controller or method. This should be disabled.
This is the MySQL Database Server. If you installed this and are doing database or web development then leave this enabled. However most desktop users and/or non-developers should leave this disabled.
Initializes network console logging. This can be left to its default disabled state.
This is used for automatic mounting of any shared network file space such as NFS, Samba, etc on bootup. Useful if you connect to another server or file sharing on your local network. Most single desktop/laptop users should have this disabled.
Netplugd can monitor network interfaces and executes commands when their state changes. This can be left to default disabled.
See NetworkManager. For most users with Fedora 12 this should be disabled.
This the standard network file sharing for Unix/Linux/BSD style operating systems. Unless you require to share data in this manner, disable this.
This is used by Samba. Please see Samba.
This daemon handles passwords and caches them for naming/authentication services like NIS, NIS+, LDAP, or hesiod. This should be disabled.
This automatically updates the system time from the internet. Mentioned in the installation process. If you have an active ("always-on") internet connection it is recommended you enable this, but it is not required.
This sets the system time according to NTP. This should be disabled as the ntpd service should provide this functionality.
This provides a method of creating a VPN (Virtual Private Network) with your system as well as many other secure network configuration (tunnelling, etc.). For more information see OpenVPN. This can be disabled, however NetworkManager can use this.
Provides support for Smart Cards and Smart Card Readers. This are small chip like devices that are embedded in certain credit cards, identification cards, etc. Unless you have such a reader, this should be disabled. Many enterprise laptops may have this hardware.
This service prevents other services (such as portmap) from occupying real ports by occupying them itself, until the real service tells it to release the port. More information can be found in the man page for portreserve. Unless you specifically know you do not need this, then leave itenabled. However in my particular case /etc/portreserve only had an entry for cups which I also do not need, hence I disabled this.
Is used to monitor and restore proper file contexts for SELinux. This is NOT required but highly recommended if you use SELinux.
This manages remote procedure call support for other services (such as NFS or NIS). This is similar to 'portmap'. This can be disabled if you have no other services depend on it.
rpcgssd, rpcidmapd, rpcsvcgssd
Used for NFS v4. Unless you require or use NFS v4, these should be disabled.
Unless you run a server or you like to transfer or support a locally shared IMAP or POP3 service, most people do NOT need a mail transport agent. If you check your mail on the web (hotmail/yahoo/gmail) or you use a mail program such as Thunderbird, Kmail, Evolution, etc. then you probably should disable this. Please note however if you require scheduled jobs either through cron or some other scheduler to inform you of activity, then leave this enabled.
The SMART Disk Monitoring Daemon can be used to monitor and predict disk failure or problems on hard disk that support this. Most desktop users may not need this unless there is possible problems, but is it recommend to be left enabled (especially for servers). Note that some harddrives may not report any (useful) information to Smart.
The SAMBA daemon is required to share files from Linux to Windows. This should be enabled only if you have windows computers that require file access to Linux. There is information on configuring Samba for Fedora 12.
This daemon provides monthly information for Smolt which is gather statistics and information to assist Fedora developers. Statistics are available. Users who wish to help and share information should enable this, otherwise leave this disabled.
These provide support for SNMP (Simple Network Management Protocol) which can be used to manage and configure devices such as servers, printers, network hubs, etc. This can be disabled, however this maybe required to run HP Printing Services (hplip).
SSH allows other users to log into or run applications on your computer from another computer on your network or remotely. This can be a potential security issue if you use weak passwords, etc.. This is not needed if you have no other computers or no need to login from a remote location (work, school, etc.). Most likely this should be disabled.
The device management system Fedora uses is 'udev'. By default 'udev' supports many rules, permissions and behaviours for devices. This service allows for saving user applied rules. It is highly recommended to leave enabled.
This service provides a way to resolve names of Windows computers/servers on a network. It can be used to manage Windows accounts with Linux accounts. Most users will not require this level of configuration and leave this disabled.
This service is required if you use a wireless card that requires WPA based encryption to connect to an Access Point, VPN or Radius Server. Most other users can leave this disabled.
This service is used with NIS network authentication. If you are not using NIS then this should be disabled.
This is a service to allow sharing of V4L or V4L2 device between multiple applications. Since I have a Hauppauge capture card, I can make use of this service, however I have disabled it.
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