A 'daemon' is a software process that runs in the background (continuously) and provides the service to client upon request. For example named is a daemon. When requested it will provide DNS service.
Other examples are:
xinetd (it is a super-daemon, it is responsible for invoking other internet servers when they are needed)
inetd (same as xinetd, but with limited configuration options)
sendmail/postfix (to send/route email)
Apache/httpd (web server)
'server process' run runs one time, when called by a daemon. Once done it will stop. For example telnetd (in.telnetd) or ftpd called from xinetd/inetd daemon . By calling server process from daemon you can save the load and memory. Use a server process for small services such as ftpd, telnetd.
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global information distribution. Process that runs on the NP of every LightStream 2020 ATM switch in a network. GID maintains a database and keeps nodes in the network apprised of changes in topology such as ports, cards, and nodes being added or removed, and trunks going up or down. This information is supplied by the ND process. Sometimes called global information distribution daemon, or GIDD.
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Saturday, April 26, 2008
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IIS runs in 2 modes (application isolation modes):
1. worker process isolation mode is a new feature of IIS 6.0.
2. IIS5.0 isolation mode - for compatibility with apps depending on IIS 5.0
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Thursday, March 20, 2008
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Boot phases of Solaris Operating Environment are:
-> boot PROM
-> boot programs like bootblk,ufsboot
-> kernel initialization like loading modules
-> init phase
-> svc.startd phase
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Wednesday, March 19, 2008
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Gracefully restarts the Apache httpd daemon. If the daemon is not running, it is started. This differs from a
normal restart in that currently open connections are not aborted. A side effect is that old log files will not
be closed immediately. This means that if used in a log rotation script, a substantial delay may be necessary to ensure that the old log files are closed before processing them. This command automatically checks
the configuration files as in configtest before initiating the restart to make sure Apache doesn?t die.
This is equivalent to apachectl -k graceful.
( excerpt from manual page of apachectl )
Actually it sends a SIGUSR1 for a restart. The USR1 or graceful signal causes the parent process to advise the children to exit after their current request (or to exit immediately if they're not serving anything). The parent
re-reads its configuration files and re-opens its log files.As each child dies off the parent replaces it with a child
from the new generation of the configuration, which begins serving new requests immediately.
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Tuesday, March 18, 2008
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