/[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 189 by dpavlin, Tue Mar 16 23:05:31 2010 UTC revision 272 by dpavlin, Fri Sep 9 18:27:11 2011 UTC
# Line 16  Line 16 
16  #  #
17  # based on Tony Risinger post to lxc-users mailing list  # based on Tony Risinger post to lxc-users mailing list
18  # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html  # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
19    #
20    # Install with:
21    # ln -sf /srv/sysadmin-cookbook/recepies/lxc/lxc-watchdog.sh /etc/init.d/lxc-watchdog
22    # update-rc.d lxc-watchdog defaults
23    
24    
25  which inotifywait >/dev/null || apt-get install inotify-tools  which inotifywait >/dev/null || apt-get install inotify-tools
# Line 33  lxc_exists() { Line 37  lxc_exists() {
37    
38    
39  lxc_rootfs() {  lxc_rootfs() {
40          grep lxc.rootfs "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'          grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
41  }  }
42    
43    lxc_hostname() {
44            inside=`cat $(lxc_rootfs $1)/etc/hostname`
45            config=`grep lxc.utsname /var/lib/lxc/$name/config | cut -d= -f2`
46            echo "$config [$inside]";
47    }
48    
49    lxc_ip() {
50            ( grep lxc.network.ipv4 /var/lib/lxc/$name/config | grep -v '^#' | cut -d= -f2 || \
51            grep address $(lxc_rootfs $name)/etc/network/interfaces | grep -v '^#' | sed 's/.*address //' ) | \
52            head -1 | \
53            sed -e 's/ *//g' -e 's/\/.*$//'
54    }
55    
56  lxc_status() {  lxc_status() {
57          lxc-ls -1 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do          ( find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | while read name ; do
58                  boot="    "                  status=`lxc-info -n $name 2>/dev/null | grep state: | cut -d: -f2`     # 0.7.5
59                    test -z "$status" && status=`lxc-info -n $name | sed -e 's/^.* is //'` # 0.7.2
60                    boot="-"
61                  test -s /var/lib/lxc/$name/on_boot && boot="boot"                  test -s /var/lib/lxc/$name/on_boot && boot="boot"
62                  echo "$name $status $boot $(lxc_rootfs $name)"                  echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)"
63          done          done ) | column -t
64  }  }
65    
66    
# Line 50  cleanup_init_scripts() { Line 68  cleanup_init_scripts() {
68          rootfs=$(lxc_rootfs $1)          rootfs=$(lxc_rootfs $1)
69    
70          ls \          ls \
71                    $rootfs/etc/rc?.d/*checkroot* \
72                  $rootfs/etc/rc?.d/*umountfs \                  $rootfs/etc/rc?.d/*umountfs \
73                  $rootfs/etc/rc?.d/*umountroot \                  $rootfs/etc/rc?.d/*umountroot \
74                  $rootfs/etc/rc?.d/*hwclock* \                  $rootfs/etc/rc?.d/*hwclock* \
75                    $rootfs/etc/rc?.d/*udev* \
76                    $rootfs/etc/rc?.d/*checkfs* \
77          2>/dev/null | xargs -i rm -v {}          2>/dev/null | xargs -i rm -v {}
78    
79            echo $1 > $rootfs/etc/hostname
80            grep $1 $rootfs/etc/hosts || echo "$(lxc_ip $1) $1" >> $rootfs/etc/hosts
81  }  }
82    
83    
# Line 64  setup_inittab() { Line 88  setup_inittab() {
88    
89          # let container respond to kill -SIGPWR          # let container respond to kill -SIGPWR
90          inittab=$rootfs/etc/inittab          inittab=$rootfs/etc/inittab
91          if ! grep "$add" ${inittab} >/dev/null ; then          if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
92                  grep -v "$remove" ${inittab} > ${inittab}.new                  grep -v "$remove" ${inittab} > ${inittab}.new
93                  echo $add >> ${inittab}.new                  echo $add >> ${inittab}.new
94                  mv ${inittab}.new ${inittab}                  mv ${inittab}.new ${inittab}
# Line 102  lxc_stop() { Line 126  lxc_stop() {
126    
127  lxc_start() {  lxc_start() {
128          name=$1          name=$1
129            rootfs=$(lxc_rootfs $1)
130    
131            if [ ! -e $rootfs ] ; then
132                    echo "ERROR $name rootfs $rootfs not found"
133                    return
134            fi
135    
136          if ! lxc-info -n $name | grep RUNNING ; then          if ! lxc-info -n $name | grep RUNNING ; then
137                  lxc_log "$name start"                  lxc_log "$name start"
138                    dev=`df -P $rootfs | tail -1 | cut -d" " -f1`
139                    mount $dev -o remount,rw # fix debian upgrade which remounts dir ro
140                  lxc-start -n $name -o /tmp/${name}.log -d                  lxc-start -n $name -o /tmp/${name}.log -d
141                  lxc-wait  -n $name -s RUNNING                  lxc-wait  -n $name -s RUNNING
142                  lxc-info  -n $name                  lxc-info  -n $name
# Line 115  lxc_start() { Line 147  lxc_start() {
147  lxc_watchdog() {  lxc_watchdog() {
148  name=$1  name=$1
149  rootfs=$(lxc_rootfs $1)  rootfs=$(lxc_rootfs $1)
150    run=$rootfs/var/run
151    test -L $run && run=$rootfs/`readlink $run` # recent Debian have symlink to /run
152    cd $run || echo "can't cd watchdog into $run"
153    
154  while true; do  while true; do
         vps_utmp=${rootfs}/var/run/utmp  
155          tasks=`wc -l < /cgroup/${name}/tasks`          tasks=`wc -l < /cgroup/${name}/tasks`
156            stop_on=1 # init
157            sulogins=`lxc-ps --name $name | grep sulogin | wc -l`
158            if [ "$sulogins" -gt 0 ] ; then
159                    stop_on=`expr $stop_on + $sulogins`
160            fi
161    
162          test -z "$tasks" && exit 1          test -z "$tasks" && exit 1
163          if [ "$tasks" -eq 1 ]; then          if [ "$tasks" -eq $stop_on ]; then
164    
165                  runlevel="$(runlevel ${vps_utmp})"                  runlevel="$(runlevel utmp)"
166                  lxc_log "$name runlevel $runlevel"                  lxc_log "$name runlevel $runlevel"
167    
168                  case $runlevel in                  case $runlevel in
169                  N*)                  N*)
170                          # nothing for new boot state                          # nothing for new boot state
171                  ;;                  ;;
172                  ??0)                  ??0|unknown)
173                          lxc_log "$name halt"                          lxc_log "$name halt"
174                          lxc-stop -n "${name}"                          lxc-stop -n "${name}"
175                          lxc-wait -n ${name} -s STOPPED                          lxc-wait -n ${name} -s STOPPED
# Line 148  while true; do Line 188  while true; do
188                  ;;                  ;;
189                  esac                  esac
190          else          else
191                  lxc_log "$name $tasks tasks"                  lxc_log "$name $tasks tasks $sulogins console"
192          fi          fi
193    
194          # time of 5 minutes on it JUST IN CASE...          # time of 5 minutes on it JUST IN CASE...
195          inotifywait -qqt 300 ${vps_utmp}          inotifywait -qqt 300 utmp
196  done  done
197    
198  lxc_log "$name watchdog exited"  lxc_log "$name watchdog exited"
# Line 160  lxc_log "$name watchdog exited" Line 200  lxc_log "$name watchdog exited"
200  }  }
201    
202    
203    usage() {
204            echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
205            exit 3
206    }
207    
208  command_on_lxc() {  command_on_lxc() {
209  command=$1  command=$1
210  shift  shift
# Line 171  case "$command" in Line 216  case "$command" in
216  start)  start)
217          lxc_exists $1          lxc_exists $1
218          cleanup_init_scripts $1          cleanup_init_scripts $1
219          setup_inittab $1 ::power      "p0::powerfail:/sbin/init 0"          setup_inittab $1 ":respawn:/sbin/getty.*tty1"   "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
220          setup_inittab $1 ::ctrlaltdel "p6::ctrlaltdel:/sbin/init 6"          setup_inittab $1 "::power"                      "p0::powerfail:/sbin/init 0"
221            setup_inittab $1 "::ctrlaltdel"                 "p6::ctrlaltdel:/sbin/init 6"
222          lxc_start $1          lxc_start $1
223          # give container 5 seconds to start more than one process          # give container 5 seconds to start more than one process
224          ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &          ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
# Line 194  disable) Line 240  disable)
240          echo -n > /var/lib/lxc/$1/on_boot          echo -n > /var/lib/lxc/$1/on_boot
241          ;;          ;;
242  *)  *)
243          echo "Usage: $0 {start|stop|restart|status}" >&2          usage
         exit 3  
244          ;;          ;;
245    
246  esac  esac
# Line 203  esac Line 248  esac
248  }  }
249    
250  command=$1  command=$1
251  shift  test -z "$command" && usage
   
252  test "$command" = "status" && lxc_status && exit  test "$command" = "status" && lxc_status && exit
253    shift
254    
255  if [ -z "$1" ] ; then  if [ -z "$1" ] ; then
256          ls /var/lib/lxc/*/on_boot | while read path ; do          ls /var/lib/lxc/*/on_boot | while read path ; do
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