Linux Services

The acpid daemon supports the Advanced Configuration and Power Interface (ACPI) to allow intelligent power management on your system and to query battery and configuration status. It listens on a file (/proc/acpi/event) and when an event occurs, executes programs to handle the event. Rules are defined by simple configuration files. acpid will look in a configuration directory (/etc/acpi/events by default), and parse all files that do not begin with a period ('.'). Each file must define two … [Read more...] about Linux OS Service ‘acpid’

This executes rpcidmapd, with NFS service. The rpcidmapd maps usernames to UID and GID numbers. Service Control To manage the rpcidmapd service on demand, use the service tool or run the /etc/init.d/rpcidmapd script directly: # /sbin/service rpcidmapd Usage: /etc/init.d/rpcidmapd {start|stop|restart|condstart|condrestart|status} # /etc/init.d/rpcidmapd Usage: /etc/init.d/rpcidmapd {start|stop|restart|condstart|condrestart|status} The available commands are: CommandDescription … [Read more...] about Linux OS Service ‘rpcidmapd’

The avahi-daemon Linux service runs on client machines to perform network-based Zeroconf service discovery. Avahi is an implementation of the DNS Service Discovery and Multicast DNS specifications for Zeroconf Networking. User applications receive notice of discovered network services and resources using the Linux D-Bus message passing. The daemon coordinates application efforts in caching replies, helping minimize network traffic. Avahi provides a set of language bindings, including Python … [Read more...] about Linux OS Service ‘avahi-daemon’

rpc.rusersd is a server which returns information about users currently logged in to the system. The currently logged in users are queried using the rusers command. The rpc.rusersd daemon is normally invoked by inetd. rpc.rusersd uses an RPC protocol defined in /usr/include/rpcsvc/rusers.x. When starting the 'rusersd' service, it first starts the portmap service if not already running, then starts the 'rpc.rusersd' daemon. When stopping the 'rusersd' service, the rpc.rusersd daemon is … [Read more...] about Linux OS Service ‘rusersd’

httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process. When used like this it will create a pool of child processes or threads to handle requests. In general, httpd should not be invoked directly, but rather should be invoked via apachectl on Unix-based systems. The httpd RPM package provides the /usr/sbin/httpd daemon and its configuration files. Service Control To manage the httpd service on demand, use the service … [Read more...] about Linux OS Service ‘httpd’

The scsi_reserve service allows you to use SCSI reservations as a fence method. An SCSI reservation restricts access to a device such that only registered nodes can access it. During system startup, the scsi_reserve script performs this registration using a unique key, based on the node's IP address. Once the node is registered, the script will attempt to create a reservation. There will be only one reservation per SCSI device but multiple registrants can exist for an SCSI device. Each node that … [Read more...] about Linux OS Service ‘scsi_reserve’

O2CB is a set of clustering services required for OCFS2 clustered operation. OCFS2 comes bundled with its own cluster stack, O2CB. The stack includes: ComponentDescription NMNode Manager that keep track of all the nodes in the /etc/ocfs2/cluster.conf HBHeart beat service that issues up/down notifications when nodes join or leave the cluster TCPHandles communication between the nodes DLMDistributed lock manager that keeps track of all locks, its owners and status CONFIGFSUser space … [Read more...] about Linux OS Service ‘o2cb’

Winbind unifies UNIX and Windows NT account management by allowing a UNIX box to become a full member of a NT domain. The service provided by winbind daemon, is called winbind and can be used to resolve user and group information from a Windows NT server, which makes it understandable by UNIX platforms. The service can also provide authentication services via an associated PAM module. The pam_winbind module supports the auth, account and password module-types. The winbind service is provided … [Read more...] about Linux OS Service ‘winbind’

This service manages RPCSEC GSS contexts for the NFSv4 client, which provides support on the client side for RPCSEC_GSS protocol. It will start rpc.gssd daemon to communicate with server-side rpcsec_gss daemon rpc.svcgssd. If using NFSv4, it is needed. The rpcsec_gss protocol gives a means of using the gss-api generic security api to provide security for protocols using rpc (in particular, nfs). Before exchanging any rpc requests using rpcsec_gss, the rpc client must first establish a … [Read more...] about Linux OS Service ‘rpcgssd’

irqbalance is a Linux daemon that distributes interrupts over among the processors and cores in your computer system. The design goal of irqbalance is to do find a balance between power savings and optimal performance. To a large degree, the work irqbalance does is invisible to you. The daemon balances savings in power consumption with performance. irqbalance is relevant on multiprocessor x86, x86_64, and AMD systems. The irqbalance configuration file /etc/sysconfig/irqbalance allows the … [Read more...] about Linux OS Service ‘irqbalance’