ctdb/config/events/legacy/41.httpd.script

   1 #!/bin/sh
   2 # event script to manage httpd in a cluster environment
   3
   4 [ -n "$CTDB_BASE" ] || \
   5     CTDB_BASE=$(d=$(dirname "$0") ; cd -P "$d" ; dirname "$PWD")
   6
   7 . "${CTDB_BASE}/functions"
   8
   9 detect_init_style
  10
  11 case $CTDB_INIT_STYLE in
  12 redhat)
  13         service_name="httpd"
  14         ;;
  15 suse|debian|*)
  16         service_name="apache2"
  17         ;;
  18 esac
  19
  20 load_script_options
  21
  22 ctdb_setup_state_dir "service" "$service_name"
  23
  24 # RHEL5 sometimes use a SIGKILL to terminate httpd, which then leaks
  25 # semaphores.  This is a hack to clean them up.
  26 cleanup_httpd_semaphore_leak() {
  27     killall -q -0 "$service_name" ||
  28     for i in $(ipcs -s | awk '$3 == "apache" { print $2 }') ; do
  29         ipcrm -s "$i"
  30     done
  31 }
  32
  33 ##########
  34
  35 service_start ()
  36 {
  37     cleanup_httpd_semaphore_leak
  38     service $service_name start
  39 }
  40 service_stop ()
  41 {
  42     service $service_name stop
  43     killall -q -9 $service_name || true
  44 }
  45
  46 [ "$CTDB_MANAGES_HTTPD" = "yes" ] || exit 0
  47
  48 case "$1" in
  49 startup)
  50         service_start
  51         ctdb_counter_init
  52         ;;
  53
  54 shutdown)
  55         service_stop
  56         ;;
  57
  58 monitor)
  59         if ctdb_check_tcp_ports 80 >/dev/null 2>/dev/null ; then
  60                 ctdb_counter_init
  61         else
  62                 ctdb_counter_incr
  63                 num_fails=$(ctdb_counter_get)
  64                 if [ "$num_fails" -eq 2 ] ; then
  65                         echo "HTTPD is not running. Trying to restart HTTPD."
  66                         service_stop
  67                         service_start
  68                         exit 0
  69                 elif [ "$num_fails" -ge 5 ] ; then
  70                         echo "HTTPD is not running. Trying to restart HTTPD."
  71                         service_stop
  72                         service_start
  73                         exit 1
  74                 fi
  75         fi
  76         ;;
  77 esac
  78
  79 exit 0
  80