Linux
無法從 cron 作業重新啟動 mysql
我有一個問題,MySQL(在 Ubuntu 12.04 上執行,所有最新更新)幾天后當機,所以將此腳本放入每 60 秒以 root 身份執行的 cron 作業中。
一切正常,除了 mysql 服務不會重新啟動,我嘗試使用“service mysql restart”和“/usr/bin/mysqld”,但它們也不起作用。
我正在使用重新啟動命令的完整路徑,所以我認為這不是問題。現在唯一可行的方法是用“重啟”替換重啟命令,這非常難看,我想避免它。
#!/bin/bash #Check if MySQL is up, if not then start it # mysql root/admin username MUSER="root" # mysql admin/root password MPASS="REMOVED" # mysql server hostname MHOST="localhost" #Shell script to start MySQL server i.e. path to MySQL daemon start/stop script. # Debain uses following script, need to setup this according to your UNIX/Linux/BSD OS. MSTART="/etc/init.d/mysql restart" # Email ID to send notification EMAILID="some@email.net" # path mysqladmin MADMIN="$(which mysqladmin)" MAILMESSAGE="/tmp/mysql.fail.$$" # see if MySQL server is alive or not $MADMIN -h $MHOST -u $MUSER -p${MPASS} ping 2>/dev/null 1>/dev/null if [ $? -ne 0 ]; then echo "" >$MAILMESSAGE echo "ALERT: MySQL Server is not responding to ping">>$MAILMESSAGE echo "Hostname: $(hostname)" >>$MAILMESSAGE echo "System Time: $(date)" >>$MAILMESSAGE # try to start mysql $MSTART>/dev/null # see if it is started or not o=$(ps cax | grep -c ' mysqld$') if [ $o -eq 1 ]; then sMess="MySQL server successfully restarted" else sMess="MySQL server FAILED to restart" fi # Email status too echo "Current Status: $sMess" >>$MAILMESSAGE echo "" >>$MAILMESSAGE echo "*** This email generated by $(basename $0) shell script ***" >>$MAILMESSAGE echo "*** Please don't reply this email, this is just notification email ***" >>$MAILMESSAGE # send email sendemail -o message-content-type=text -f some@email.net -t $EMAILID -u MySQL GURU ALARM -m < $MAILMESSAGE else # MySQL is running :) and do nothing : fi # remove file rm -f $MAILMESSAGE
如果沒有看到啟動錯誤日誌,幾乎無法診斷。
如果我不得不冒險猜測,這聽起來很可能有問題
ulimit
,該程序可能無法從 cron 分配它需要的記憶體,但在通過互動式 shell 執行時不受限制。MySQL 日誌將確認這一點,儘管是以非描述方式。此外,不要使用半豎起的腳本重新發明輪子,只需使用公認的監控應用程序,如
monit