Public bug reported:
In my (extensive) experience with MAAS and AMT systems, the
etc/maas/templates/power/amt.template gives up way too easily, when AMT
doesn't respond.
In the current code, it tries the amttool command merely twice.
I find that the first invocation of the command is usually necessary to
nudge the AMT awake. The second one then usually succeeds, but it does
occasionally get dropped too.
Upping that retry count to ~10 actually makes AMT work about 95% of the
time, in my testing.
=== modified file 'etc/maas/templates/power/amt.template'
--- etc/maas/templates/power/amt.template 2014-04-15 20:37:57 +0000
+++ etc/maas/templates/power/amt.template 2014-04-21 23:24:37 +0000
@@ -25,10 +25,16 @@
}
state() {
- state=`{
- # Retry the state if it fails because it often fails the first time.
- amt 2> /dev/null || amt
- } | grep '^Powerstate:' | awk '{print $2}'`
+ # Retry the state if it fails because it often fails the first time.
+ local count=0
+ local state=
+ while true; do
+ state=$(amt info | grep '^Powerstate:' | awk '{print $2}')
+ [ -n "$state" ] && break
+ count=$((count+1))
+ [ $count -gt 10 ] && break
+ sleep 1
+ done
echo $state
}
@@ -46,7 +52,7 @@
echo desired $desired_state
current_state=`state`
-for i in `seq 0 1`; do
+for i in `seq 0 10`; do
echo found current_state $current_state
if [ "$current_state" '=' "" ]; then
echo Cannot get current state
** Affects: maas
Importance: High
Status: Triaged
** Affects: maas (Ubuntu)
Importance: High
Status: Triaged
** Affects: maas (Ubuntu Trusty)
Importance: High
Status: Triaged
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https://bugs.launchpad.net/bugs/1310846
Title:
amt template gives up way too easily
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