lowerpower / connectivity_monitor

Simple connectivity monitor to log when a system does not have connectivity to a target

connectivity_monitor

Simple connectivity monitor to log when a system does not have connectivity to a target using a simple ping test, option to log to syslog when connectivity fails

usage:

con_mon.sh [-v] [-s] [-c] [-i] <target host optinal>

All options optional, will use defaults if not specified.

 -v up to 3 times for verbose level (level 1 enables connectivity is ONLINE output)
 -s will log to syslog insted of stdio
 -c number of pings to send per interval (default 2)
 -i interval in seconds to check connectivity (default 30)

hostname to ping is optinal, by default will use 8.8.8.8

Install to /usr/local/bin/con_mon.sh

do not forget to chmod +x /usr/local/bin/con_mon.sh

I use this in rc.local and log to either a file or syslog

to syslog:

  /usr/local/bin/con_mon.sh -s &>/dev/null &

to logfile:

/usr/local/bin/con_mon.sh &> /tmp/con_mon.log &   

Output

The following exampels are with -v set so "connectivity is ONLINE" is show, otherwise only offline events are shown.

output to stdio will be timestamped:

20230111104728: Connectivity tester starting:
20230111104728: Target Host 8.8.8.8, Interval 30 seconds, Ping Test Count 2, verbose level 1
20230111104728: connectivity is ONLINE to 8.8.8.8

20230111104728: exit after next interval
20230111104759: Connectivity Tester Shutting Down

Output to syslog will be markd by the ID and pid:

Shutdown

HUP INT TERM are trapped and will shutdown after the current operation is over, could be up to interval seconds.

A signal sent to this pid will shut the software down after the next cycle.