commit | author | age
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dead5c
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<?php |
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/* |
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Copyright (c) 2007-2011, Till Brehm, projektfarm Gmbh and Oliver Vogel www.muv.com |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without modification, |
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are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright notice, |
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this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright notice, |
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this list of conditions and the following disclaimer in the documentation |
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and/or other materials provided with the distribution. |
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* Neither the name of ISPConfig nor the names of its contributors |
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may be used to endorse or promote products derived from this software without |
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specific prior written permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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class rescue_core_module { |
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var $module_name = 'rescue_core_module'; |
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var $class_name = 'rescue_core_module'; |
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/* No actions at this time. maybe later... */ |
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var $actions_available = array(); |
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/** |
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* The monitoring-Data of this module. |
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* [0] are the actual data, [1] are the data 1 minnute ago [2] are teh data 2 minuntes... |
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*/ |
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private $_monitoringData = array(); |
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/** The rescue-Data of this module. */ |
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private $_rescueData = array(); |
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dead5c
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/** |
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* This function is called during ispconfig installation to determine |
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* if a symlink shall be created for this plugin. |
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*/ |
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function onInstall() { |
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return true; |
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} |
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dead5c
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/** |
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* This function is called when the module is loaded |
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*/ |
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function onLoad() { |
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$this->_doRescue(); |
dead5c
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} |
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dead5c
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/** |
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* This function is called when a change in one of the registered tables is detected. |
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* The function then raises the events for the plugins. |
dead5c
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*/ |
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function process($tablename, $action, $data) { |
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// not needed |
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} |
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/** |
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* This Method tries to rescue the server if a service is down. |
dead5c
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*/ |
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private function _doRescue() { |
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/* |
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* do nothing, if the rescue-system is not enabled |
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*/ |
dead5c
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global $conf; |
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if ((!isset($conf['serverconfig']['rescue']['try_rescue'])) || |
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((isset($conf['serverconfig']['rescue']['try_rescue'])) && ($conf['serverconfig']['rescue']['try_rescue'] !='y'))){ |
dead5c
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return; |
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} |
dead5c
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/* |
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* First we get the monitoring data needed for rescuing the system |
dead5c
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*/ |
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$this->_monitoringData = $this->_getMonitoringData(); |
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/* |
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* Next we get the rescue data needed for rescuing the system |
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*/ |
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$this->_rescueData = $this->_getRescueData(); |
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/* |
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* rescue mysql if needed (maybe httpd depends on mysql, so try this first!) |
039b46
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*/ |
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$this->_rescueMySql(); |
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/* |
8ab3cd
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* rescue httpd if needed |
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*/ |
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$this->_rescueHttpd(); |
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/* |
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* The last step is to save the rescue-data |
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*/ |
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$this->_saveRescueData(); |
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} |
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/** |
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* This gets the Monitoring-Data, needed for rescuing the system. |
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* Because we can not be 100% sure, that the mysql-DB is up and running, so we use the |
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* file-system (this is no problem, because this module is the only one using this data, |
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* so we do not have parallel access. |
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*/ |
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private function _getMonitoringData() { |
dead5c
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global $app; |
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$dataFilename = dirname(__FILE__) . "/../temp/rescue_module_monitoringdata.ser.txt"; |
7fe908
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/* |
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* If the file containing the data is too old (older than 5 minutes) it is better to |
7fe908
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* delete it, because it could be, that the server was down for some times and so the data |
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* are outdated |
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*/ |
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if (file_exists($dataFilename) && (filemtime($dataFilename) < (time() - 5 * 60))) { |
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unlink($dataFilename); |
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} |
dead5c
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/* |
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* Get the monitoring-data |
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*/ |
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if (file_exists($dataFilename)) { |
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$data = unserialize(file_get_contents($dataFilename)); |
dead5c
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} else { |
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$data = array(); |
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} |
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/* |
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* $temp[0] was the data of the last monitoring (means 1 minute ago), $temp[1] is the data |
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* 2 minutes ago and so on. Now we have make place for the newest data... |
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*/ |
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$max = sizeof($data); |
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if ($max > 10){ |
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$max = 10; // not more than 10 histories |
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} |
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for ($i = $max; $i > 0; $i--){ |
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$data[$i] = $data[$i -1]; |
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} |
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/* |
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* we need the monitoring tools |
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*/ |
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$app->load('monitor_tools'); |
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$tools = new monitor_tools(); |
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/* |
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* Call the needed Monitoring-step and get the data |
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*/ |
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$tmp[0] = $tools->monitorServices(); |
7fe908
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/* Add the data at the FIRST position of the history */ |
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$data[0] = $tmp; |
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/* |
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* We have the newest monitoring data. Save it! |
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* (and protect it, because there may be sensible data in it) |
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*/ |
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file_put_contents($dataFilename, serialize($data)); |
849624
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chmod($dataFilename, 0600); |
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/* Thats it */ |
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return $data; |
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} |
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4ebc7d
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/** |
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* This gets the rescue-Data, needed for rescuing the system. |
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* Because we can not be 100% sure, that the mysql-DB is up and running, so we use the |
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* file-system (this is no problem, because this module is the only one using this data, |
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* so we do not have parallel access. |
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*/ |
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private function _getRescueData() { |
686742
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$dataFilename = dirname(__FILE__) . "/../temp/rescue_module_rescuedata.ser.txt"; |
4ebc7d
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/* |
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* If the file containing the data is too old (older than 5 minutes) it is better to |
7fe908
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* delete it, because it could be, that the server was down for some times and so the data |
4ebc7d
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* are outdated |
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*/ |
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if (file_exists($dataFilename) && (filemtime($dataFilename) < (time() - 5 * 60))) { |
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unlink($dataFilename); |
dead5c
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} |
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/* |
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* Get the rescue-data |
dead5c
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*/ |
4ebc7d
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if (file_exists($dataFilename)) { |
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$data = unserialize(file_get_contents($dataFilename)); |
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} else { |
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$data = array(); |
dead5c
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} |
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/* Thats it */ |
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return $data; |
dead5c
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} |
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/** |
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* Writes the rescue data to disk. |
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* Because we can not be 100% sure, that the mysql-DB is up and running, so we use the |
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* file-system (this is no problem, because this module is the only one using this data, |
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* so we do not have parallel access. |
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*/ |
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private function _saveRescueData() { |
686742
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$dataFilename = dirname(__FILE__) . "/../temp/rescue_module_rescuedata.ser.txt"; |
849624
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/* |
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* We have the newest data. Save it! |
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* (and protect it, because there may be sensible data in it) |
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*/ |
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file_put_contents($dataFilename, serialize($this->_rescueData)); |
849624
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chmod($dataFilename, 0600); |
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} |
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/** |
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* restarts httpd, if needed |
4ebc7d
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*/ |
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private function _rescueHttpd(){ |
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global $app, $conf; |
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dead5c
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/* |
8ab3cd
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* do nothing, if it is not allowed to rescue httpd |
dead5c
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*/ |
8ab3cd
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if ((isset($conf['serverconfig']['rescue']['do_not_try_rescue_httpd']) && ($conf['serverconfig']['rescue']['do_not_try_rescue_httpd']) == 'y')){ |
dead5c
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return; |
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} |
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4ebc7d
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/* |
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* if the service is up and running, or the service is not installed there is nothing to do... |
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*/ |
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if ($this->_monitoringData[0][0]['data']['webserver'] != 0){ |
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/* Clear the try counter, because we do not have to try to rescue the service */ |
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$this->_rescueData['webserver']['try_counter'] = 0; |
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return; |
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} |
7fe908
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4ebc7d
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/* |
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* OK, the service is installed and down. |
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* Maybe this is because of a restart of the service by the admin. |
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* This means, we check the data 1 minute ago |
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*/ |
7fe908
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if ((!isset($this->_monitoringData[1][0]['data']['webserver'])) || |
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((isset($this->_monitoringData[1][0]['data']['webserver'])) && ($this->_monitoringData[1][0]['data']['webserver'] != 0))){ |
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/* |
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* We do NOT have this data or we have this data, but the webserver was not down 1 minute ago. |
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* This means, it could be, that the admin is restarting the server. |
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* We wait one more minute... |
dead5c
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*/ |
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return; |
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} |
7fe908
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|
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/*##### |
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* The service is down and it was down 1 minute ago. |
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* We try to rescue it |
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*#####*/ |
7fe908
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/* Get the try counter */ |
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$tryCount = (!isset($this->_rescueData['webserver']['try_counter']))? 1 : $this->_rescueData['webserver']['try_counter'] + 1; |
7fe908
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/* Set the new try counter */ |
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$this->_rescueData['webserver']['try_counter'] = $tryCount; |
355feb
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if ($tryCount > 2 && $conf['serverconfig']['web']['server_type'] != 'nginx') { |
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if($app->system->is_user('apache')) { |
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$app->log("Clearing semaphores table for user apache.",LOGLEVEL_WARN); |
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exec("ipcs -s | grep apache | awk '{ print $2 }' | xargs ipcrm sem"); |
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} |
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if($app->system->is_user('www-data')) { |
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$app->log("Clearing semaphores table for user apache.",LOGLEVEL_WARN); |
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exec("ipcs -s | grep www-data | awk '{ print $2 }' | xargs ipcrm sem"); |
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} |
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} |
7fe908
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/* if 5 times will not work, we have to give up... */ |
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if ($tryCount > 5){ |
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$app->log('httpd is down! Rescue will not help!', LOGLEVEL_ERROR); |
4ebc7d
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return; |
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} |
7fe908
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8ab3cd
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$app->log('httpd is down! Try rescue httpd (try:' . $tryCount . ')...', LOGLEVEL_WARN); |
7fe908
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8ab3cd
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if($conf['serverconfig']['web']['server_type'] == 'nginx'){ |
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$daemon = 'nginx'; |
dead5c
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} else { |
8ab3cd
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if(is_file($conf['init_scripts'] . '/' . 'httpd')) { |
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$daemon = 'httpd'; |
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} elseif(is_file($conf['init_scripts'] . '/' . 'httpd2')){ |
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$daemon = 'httpd2'; |
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} else { |
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$daemon = 'apache2'; |
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} |
dead5c
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} |
7fe908
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eed6b3
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$this->_rescueDaemon($daemon); |
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} |
7fe908
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eed6b3
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/** |
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* restarts mysql, if needed |
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*/ |
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private function _rescueMySql(){ |
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global $app, $conf; |
7fe908
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eed6b3
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/* |
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* do nothing, if it is not allowed to rescue mysql |
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*/ |
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if ((isset($conf['serverconfig']['rescue']['do_not_try_rescue_mysql']) && ($conf['serverconfig']['rescue']['do_not_try_rescue_mysql']) == 'y')){ |
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return; |
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} |
7fe908
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eed6b3
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/* |
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* if the service is up and running, or the service is not installed there is nothing to do... |
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*/ |
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if ($this->_monitoringData[0][0]['data']['mysqlserver'] != 0){ |
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/* Clear the try counter, because we do not have to try to rescue the service */ |
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$this->_rescueData['mysqlserver']['try_counter'] = 0; |
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return; |
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} |
7fe908
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eed6b3
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/* |
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* OK, the service is installed and down. |
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* Maybe this is because of a restart of the service by the admin. |
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* This means, we check the data 1 minute ago |
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*/ |
7fe908
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if ((!isset($this->_monitoringData[1][0]['data']['mysqlserver'])) || |
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((isset($this->_monitoringData[1][0]['data']['mysqlserver'])) && ($this->_monitoringData[1][0]['data']['mysqlserver'] != 0))){ |
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/* |
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* We do NOT have this data or we have this data, but the webserver was not down 1 minute ago. |
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* This means, it could be, that the admin is restarting the server. |
eed6b3
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* We wait one more minute... |
V |
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*/ |
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return; |
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} |
7fe908
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|
eed6b3
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/*##### |
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* The service is down and it was down 1 minute ago. |
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* We try to rescue it |
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*#####*/ |
7fe908
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eed6b3
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/* Get the try counter */ |
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$tryCount = (!isset($this->_rescueData['mysqlserver']['try_counter']))? 1 : $this->_rescueData['mysqlserver']['try_counter'] + 1; |
7fe908
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eed6b3
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/* Set the new try counter */ |
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$this->_rescueData['mysqlserver']['try_counter'] = $tryCount; |
7fe908
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|
eed6b3
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/* if 5 times will not work, we have to give up... */ |
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if ($tryCount > 5){ |
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$app->log('MySQL is down! Rescue will not help!', LOGLEVEL_ERROR); |
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return; |
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} |
7fe908
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eed6b3
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$app->log('MySQL is down! Try rescue mysql (try:' . $tryCount . ')...', LOGLEVEL_WARN); |
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if(is_file($conf['init_scripts'] . '/' . 'mysqld')) { |
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$daemon = 'mysqld'; |
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} else { |
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$daemon = 'mysql'; |
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} |
7fe908
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eed6b3
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$this->_rescueDaemon($daemon); |
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} |
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/** |
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* Tries to stop and then restart the daemon |
7fe908
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* |
eed6b3
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* @param type $daemon the name of the daemon |
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*/ |
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private function _rescueDaemon($daemon){ |
4f02ea
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global $conf, $app; |
7fe908
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33bcd0
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$app->uses('system'); |
eed6b3
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// if you need to find all restarts search for "['init_scripts']" |
V |
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/* |
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* First we stop the running service "normally" |
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*/ |
7fe908
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|
dead5c
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/* |
4ebc7d
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* ATTENTION! |
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* The service hangs. this means it could be, that "stop" will hang also. |
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* So we have to try to stop but if this will not work, we have to kill the stopping |
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* of the service |
dead5c
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*/ |
33bcd0
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exec($app->system->getinitcommand($daemon, 'stop').' && (sleep 3; kill $!; sleep 2; kill -9 $!) &> /dev/null'); |
7fe908
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4ebc7d
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/* |
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* OK, we tryed to stop it normally, maybe this worked maybe not. So we have to look |
|
403 |
* if the service is already running or not. If so, we have to kill them hard |
|
404 |
*/ |
|
405 |
exec("kill -9 `ps -A | grep " . $daemon . "| grep -v grep | awk '{print $1}'` &> /dev/null"); |
7fe908
|
406 |
|
4ebc7d
|
407 |
/* |
V |
408 |
* There are no more zombies left. Lets start the service.. |
|
409 |
*/ |
33bcd0
|
410 |
exec($app->system->getinitcommand($daemon, 'start')); |
dead5c
|
411 |
} |
7fe908
|
412 |
|
dead5c
|
413 |
} |
7fe908
|
414 |
|
dead5c
|
415 |
?> |