/[sysadmin-cookbook]/recepies/lxc/lxc-watchdog.sh
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Diff of /recepies/lxc/lxc-watchdog.sh

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revision 175 by root, Mon Mar 15 23:08:31 2010 UTC revision 180 by dpavlin, Tue Mar 16 16:18:40 2010 UTC
# Line 1  Line 1 
1  #!/bin/bash -x  #!/bin/bash
2    
3  # based on Tony Risinger code from lxc-users  # based on Tony Risinger code from lxc-users
4  # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html  # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
5    
6  which inotifywait || apt-get install inotify-tools  which inotifywait >/dev/null || apt-get install inotify-tools
7    
8  name=llin  name=$1
9    
10  #lxc-info -n $name | grep RUNNING && exit  if [ ! -e /var/lib/lxc/$name/config ] ; then
11            echo "Usage: $0 name"
12            ls /var/lib/lxc/*/config | cut -d/ -f5
13            exit 1
14    fi
15    
16  rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`  rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`
17  echo "$name rootfs $rootfs"  echo "$name rootfs $rootfs"
18    
 # fix lxc-stop which remounts ro  
 mount /mnt/llin -o remount,rw  
19    
20  lxc-start -d -n $name -o /tmp/${name}.log  # cleanup init scripts which don't work in containers
21    ls \
22            $rootfs/etc/rc?.d/*umountfs \
23            $rootfs/etc/rc?.d/*umountroot \
24            $rootfs/etc/rc?.d/*hwclock* \
25    2>/dev/null | xargs -i rm -v {}
26    
27    
28    # let container respond to kill -SIGPWR
29    inittab=$rootfs/etc/inittab
30    powerfail="pw::powerfail:/sbin/init 0"
31    if ! grep "$powerfail" ${inittab} >/dev/null ; then
32            grep -v ::power ${inittab} > ${inittab}.new
33            echo $powerfail >> ${inittab}.new
34            mv ${inittab}.new ${inittab}
35            echo "$initab modified"
36    fi
37    
38    
39    if [ "$2" == "stop" ] ; then
40            echo "$name stop"
41            kill -SIGPWR `lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-`
42            lxc-wait -n $name -s STOPPED
43            exit
44    fi
45    
46    
47    if ! lxc-info -n $name | grep RUNNING ; then
48            echo "$name start"
49            lxc-start -n $name -o /tmp/${name}.log -d
50            lxc-wait  -n $name -s RUNNING
51            lxc-info  -n $name
52    fi
53    
54  while true; do  while true; do
55          # time of 5 minutes on it JUST IN CASE...          # time of 5 minutes on it JUST IN CASE...
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