[icecast] Propping up liveice
matt at sprout.org
Fri May 24 11:43:46 PDT 2002
I'm a volunteer who runs the mp3 streaming for KGNU-FM in Boulder,
Colorado. We stream live at 64K with Linux, icecast 1.3.12+ minor
patches, liveice, and lame 3.92. It easily supports 32 internet
listeners 24x7 from a donated 400MHz Pentium II.
Liveice is the only problem--it does its job of connecting the soundcard
rec in to the lame encoder and to icecast, but dies without explanation
on the average of every couple weeks. I tried darkice, but it doesn't
deal with lame correctly. So I wrote a script to resurrect liveice when
needed. It is very specific to our setup, because it expects a certain
number of process ids (threads) to be there. Root runs this every five
minutes via cron like this:
*/5 * * * * /usr/local/icecast/bin/check_icecast
We now average about 60 seconds of downtime a month, and I can leave the
server totally unattended. I hope this is of use to someone else, and I
welcome any suggestions. Here's the script:
# This script ensures that icecast, liveice, and lame are alive, and
# restarts them if they're not. It checks for an expected number of
# process ids owned by "nobody". If those aren't found, it kills any
# stragglers and runs the appropriate startup script. It uses pgrep
# (find process by wildcard) and wc (word count).
# If everything looks alive, this script outputs nothing. Otherwise,
# it reports what had to be restarted and when. This script is
# intended to be run often via cron.
# TODO: It's possible that all the processes are alive, but that the
# liveice source has become disconnected from the icecast server
# somehow. We need a way to check for this condition, too.
LIVEICE_PIDS=`pgrep -u nobody 'liveice|lame'`
LIVEICE_PIDNUM=`echo $LIVEICE_PIDS | wc -w`
ICECAST_PIDS=`pgrep -u nobody 'icecast'`
ICECAST_PIDNUM=`echo $ICECAST_PIDS | wc -w`
if [ "$ICECAST_PIDNUM" -lt "6" ] ; then
kill -9 $LIVEICE_PIDS $ICECAST_PIDS >/dev/null 2>/dev/null
su nobody -c ./start_streaming
echo "icecast restarted at `date`"
renice -1 `pgrep -u nobody 'liveice|lame|icecast'`
if [ "$LIVEICE_PIDNUM" -lt "3" ] ; then
kill -9 $LIVEICE_PIDS >/dev/null 2>/dev/null
su nobody -c ./start_liveice
echo "liveice restarted at `date`"
renice -1 `pgrep -u nobody 'liveice|lame'`
<p>--- >8 ----
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