16-Daemons - CSE 265 System and Network Administration...

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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison CSE 265: CSE 265: System and Network Administration System and Network Administration Daemons init cron and atd inetd and xinetd Kernel daemons File service daemons Internet daemons Time synchronization daemons Booting and configuration daemons FTP and WWW proxy servers
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison init init First process to run after booting PID of 1 Either goes to single user mode or starts scripts to go to multiuser mode Runs some version of getty for console and serial logins
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison cron and atd cron and atd crond runs commands at preset times so does atd but can limit when jobs are run (based on load)
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison inetd and xinetd inetd and xinetd inetd is a daemon that manages other daemons Starts client daemons only when there is work for them, and lets them die when their work is complete Only works with daemons that provide network services Attaches itself to the network ports used by clients When connection occurs, inetd starts the daemon, and connects standard I/O to the network port xinetd is an improved alternative that incorporates security features
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison /etc/inetd.conf /etc/inetd.conf inetd uses /etc/inetd.conf to determine which ports and daemons to use (along with /etc/services) # Sample portions of an /etc/inetd.conf from Solaris # ftp stream tcp6 nowait root /usr/sbin/tcpd in.ftpd telnet stream tcp6 nowait root /usr/sbin/tcpd in.telnetd # shell stream tcp nowait root /usr/sbin/tcpd in.rshd shell stream tcp6 nowait root /usr/sbin/tcpd in.rshd login stream tcp6 nowait root /usr/sbin/tcpd in.rlogind exec stream tcp nowait root /usr/sbin/tcpd in.rexecd exec stream tcp6 nowait root /usr/sbin/tcpd in.rexecd talk dgram udp wait root /usr/sbin/tcpd in.talkd time stream tcp6 nowait root internal time dgram udp6 wait root internal
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