Prozess mit PID bestimmter starten

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  • Bei Netzwerkserver sehe ich kein Problem - die werden doch sowieso meist nur über ihre Ports angesprochen.

    Ansonsten braucht man die PIDs auch nicht zwischenspeichern. Man kann sie einfach mit folgendem Befehl auslesen

    Quellcode

    1. pidof apache2


    Ansonsten schau dir irgendwelche init Scripts an
    PIDs mal am Beispiel von Apache:

    Quellcode

    1. #!/bin/bash -e
    3. APACHE2CTL="$ENV /usr/sbin/apache2ctl"
    5. apache_stop() {
    6. PID=""
    7. PIDFILE=""
    8. AP_CONF=/etc/apache2/apache2.conf
    10. # apache2 allows more than PidFile entry in the config but only the
    11. # last found in the config is used; we attempt to follow includes
    12. # here, but only first-level includes are supported, not nested ones
    13. for i in $AP_CONF `awk '$1 ~ /^\s*[Ii]nclude$/ && $2 ~ /^\// {print $2}' $AP_CONF`; do
    14. PIDFILE=`grep -i ^PidFile $i | tail -n 1 | awk '{print $2}'`
    15. if [ -e "$PIDFILE" ]; then
    16. PID=`cat $PIDFILE`
    17. fi
    18. done
    20. if [ $? = 0 ]; then
    21. # if the config is ok than we just stop normaly
    23. if [ -n "$PID" ]
    24. then
    25. $APACHE2CTL stop
    27. CNT=0
    28. while [ 1 ]
    29. do
    30. CNT=$(expr $CNT + 1)
    32. [ ! -d /proc/$PID ] && break
    34. if [ $CNT -gt 60 ]
    35. then
    36. if [ "$VERBOSE" != "no" ]; then
    37. echo " ... failed!"
    38. echo "Apache2 failed to honor the stop command, please investigate the situation by hand."
    39. fi
    40. return 1
    41. fi
    43. sleep 1
    44. done
    45. else
    46. if [ "$VERBOSE" != "no" ]; then
    47. echo -n " ... no pidfile found! not running?"
    48. fi
    49. fi
    51. else
    52. [ "$VERBOSE" != "no" ] && echo "$errors"
    54. # if we are here something is broken and we need to try
    55. # to exit as nice and clean as possible
    57. # if pidof is null for some reasons the script exits automagically
    58. # classified as good/unknown feature
    59. PIDS=`pidof apache2` || true
    61. REALPID=0
    62. # if there is a pid we need to verify that belongs to apache2
    63. # for real
    64. for i in $PIDS; do
    65. if [ "$i" = "$PID" ]; then
    66. # in this case the pid stored in the
    67. # pidfile matches one of the pidof apache
    68. # so a simple kill will make it
    69. REALPID=1
    70. fi
    71. done
    73. if [ $REALPID = 1 ]; then
    74. # in this case everything is nice and dandy
    75. # and we kill apache2
    76. kill $PID
    77. else
    78. # this is the worst situation... just kill all of them
    79. #for i in $PIDS; do
    80. # kill $i
    81. #done
    82. # Except, we can't do that, because it's very, very bad
    83. if [ "$PIDS" ] && [ "$VERBOSE" != "no" ]; then
    84. echo " ... failed!"
    85. echo "You may still have some apache2 processes running. There are"
    86. echo "processes named 'apache2' which do not match your pid file,"
    87. echo "and in the name of safety, we've left them alone. Please review"
    88. echo "the situation by hand."
    89. fi
    90. return 1
    91. fi
    92. fi
    93. }
    95. # Stupid hack to keep lintian happy. (Warrk! Stupidhack!).
    96. case $1 in
    97. start)
    98. log_begin_msg "Starting apache 2.0 web server..."
    99. $APACHE2CTL startssl
    100. ;;
    101. stop)
    102. log_begin_msg "Stopping apache 2.0 web server..."
    103. apache_stop
    104. ;;
    105. esac
    Alles anzeigen


    (reduziert - original unter /etc/init.d/apache2)