What is active?
One can find out what processes are normally running via ps ux:
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voyage:~# netstat -nlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 2830/portmap tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 3062/apache tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN 6063/dnsmasq tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 3006/pptpd tcp6 0 0 :::53 :::* LISTEN 6063/dnsmasq tcp6 0 0 :::22 :::* LISTEN 6032/sshd udp 0 0 0.0.0.0:53 0.0.0.0:* 6063/dnsmasq udp 0 0 0.0.0.0:67 0.0.0.0:* 6063/dnsmasq udp 0 0 0.0.0.0:111 0.0.0.0:* 2830/portmap udp6 0 0 :::53 :::* 6063/dnsmasq Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node PID/Program name Path |
Finding things
The data is kept in /usr/local/share/pinger/data/ with files of the form ping-yyyy-mm.txt where yyyy is the year and mm the month (1-12).
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voyage:~# ls \-l /usr/lib/cgi-bin total 72 -rwxr-xr-x 1 root root 15101 Jan 7 2000 cgi-lib.pl -rwxr-xr-x 1 root root 20101 May 15 23:17 ping_data.pl -rwxr-xr-x 1 root root 36226 May 12 22:00 traceroute.pl |
Updating crontab
Edit /etc/crontab and save. then reboot to make the new version take effect (alternatively use kill -HUP <PID> where you can find the PID from the ps ux command to restart the crontab process).
Logs
The log is kept in /var/log/messages. We believe this "rotated" (compressed, saved and deleted) automatically by syslog using /etc/logrotate.conf and /etc/syslog.conf, so memory is not eventually exhausted.
Applying Patches
On the one hand one wants to keep the system and applications patched to the latest releases. On the other hand this may require considerable bandwidth to download the patches, or timeouts, it could gobble up memory in the host etc.
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