server- <<resident-cronjob-process>>
接手了个项目，需要常驻后台的cronjob，总结下常用的方法
manager来定时检测process，如果没有run就start一个process后台运行
*/1 * * * * 1 sh check.sh
#!/bin/bash
count=`ps aux | grep processname | grep -v grep`
if [ $? -ne 0 ]; then
start_command > /dev/null &
echo "start process....."
else
echo "runing....."
fi
*/1 * * * * 1 php /path/to/manager.php
<?php
...省略检测
$cmd = "/path/to/cmd $args &";
echo $cmd . ' running ';
popen($cmd, "r");
进程自己检测,防重入，同一时间只一个进程 run
*/1 * * * * 1 start_process_command
$cmd = 'ps aux | grep -i processname | grep -v grep | wc -l';
exec($cmd, $result);
log_message('debug', '$ret:' . json_encode($ret));
if ($result && intval($result[0]) >= 3) {
log_message('debug', 'processname already running');
exit('processname already running');
} else {
log_message('error', 'processname not running, start');
}