php fork太多进程导致整体性能下降,mysql down掉的解决.
1.同事跑了一个php的抓取, 这个会导致非常高的sleep,大概到好几千的水平.进而mysql会down掉. 写了个crontab #crontab -e * */1 * * * /sh/detect_php.sh detech_php 的内容 #!/bin/bashhost_dir=`cd /sh`proc_name=mysqlbug_time=`date -R`pid=0proc_num(){n
1.同事跑了一个php的抓取, 这个会导致非常高的sleep值,大概到好几千的水平.进而mysql会down掉.
写了个crontab
#crontab -e
* */1 * * * /sh/detect_php.sh
#!/bin/bash host_dir=`cd /sh` proc_name="mysql" bug_time=`date -R` pid=0 proc_num() { num=`ps -ef | grep $proc_name | grep -v grep | wc -l` return $num } proc_id() { pid=`ps -ef | grep $proc_name | grep -v grep | awk '{print $2}'` } proc_num number=$? if [ $number -eq 0 ] then ./restart_php_mysql.sh proc_id echo " Kill the php and new mysql pid is : ${pid} : ${bug_time} " >> php_mysql.log 2>&1 else proc_id echo " The mysql is working , ${bug_time} " >> php_mysql.log 2>&1 echo "it's ok!" fi
脚本解释,这个脚本非常简单的. 就是判断mysql进程是否为0, 如果为0,那么就去杀掉php,然后重启mysql.并且写入一个日志.
restart_php_mysql.sh 的内容
#!/bin/sh killall -9 php service mysql restart
pkill会导致脚本在杀完进程后直接terminated. 所以这里不使用pkill.
改进的
#!/bin/bash host_dir=`cd /sh` log_dir="/var/log/php_mysql_log/" proc_name="mysql" bug_time=`date -R` pid=0 now_time=`date +%F` log_file="${log_dir}${now_time}.log" log_detect() { if [ ! -d "$log_dir" ]; then mkdir "$log_dir" fi if [ ! -f "$log_file" ] then touch "$log_file" fi } proc_num() { num=`ps -ef | grep $proc_name | grep -v grep | wc -l` return $num } proc_id() { pid=`ps -ef | grep $proc_name | grep -v grep | awk '{print $2}'` } proc_num number=$? if [ $number -eq 0 ] then ./restart_php.sh proc_id log_detect echo " Kill the php and new mysql pid is : ${pid} : ${bug_time} " >> ${log_dir}${now_time}.log 2>&1 else proc_id log_detect echo " The mysql is working ,${pid} : ${bug_time} " >> ${log_dir}${now_time}.log 2>&1 echo "it's ok!" fi

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