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 […]
Archives for July 2018
Linux OS Service ‘rusersd’
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 […]
Linux OS Service ‘httpd’
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 […]
Linux OS Service ‘scsi_reserve’
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 […]
Linux OS Service ‘o2cb’
O2CB is a set of clustering services required for OCFS2 clustered operation. OCFS2 comes bundled with its own cluster stack, O2CB. The stack includes: Component Description NM Node Manager that keep track of all the nodes in the /etc/ocfs2/cluster.conf HB Heart beat service that issues up/down notifications when nodes join or leave the cluster TCP Handles […]