自动监控MySQL复制的Shell脚本

now=`date +"%Y%m%d%H%M%S"`

StatFile="./slave_status.$now"

echo "show slave status\G" | mysql -uroot -pmypasswd > $StatFile

#取得 io_thread, sql_thread, last_errno 的状态
IoStat=`cat $StatFile | grep Slave_IO_Running | awk '{print $2}'`
SqlStat=`cat $StatFile | grep Slave_SQL_Running | awk '{ print $2}'`
Errno=`cat $StatFile | grep Last_Errno | awk '{print $2}'`
Behind=`cat $StatFile | grep Seconds_Behind_Master | awk '{print $2}'`

#IoStat=`cat $StatFile | head -n 12 | tail -n 1 | awk '{print $2}'`
#SqlStat=`cat $StatFile | head -n 13 | tail -n 1 | awk '{print $2}'`
#Errno=`cat $StatFile | head -n 20 | tail -n 1 | awk '{print $2}'`

if [ $IoStat = 'No' ] || [ $SqlStat = 'No' ] ; then

echo "[chkslave]"
date
#如果错误代码为 0，则可能是因为网络等原因导致复制中断，直接重新启动复制即可
if [ "$Errno" -eq 0 ] ; then
echo "start slave io_thread; start slave sql_thread;" | mysql -uroot -pmypasswd
echo "start slave io_thread; start slave sql_thread;"
#如果是一些不是很要紧的错误代码，也可以直接略过
elif [ "$Errno" -eq 1007 ] || [ "$Errno" -eq 1053 ] || [ "$Errno" -eq 1062 ] || [ "$Errno" -eq 1213 ] \
|| [ "$Errno" -eq 1158 ] || [ "$Errno" -eq 1159 ] || [ "$Errno" -eq 1008 ] ; then
echo "stop slave; set global sql_slave_skip_counter=1; slave start;" | mysql -uroot -pmypasswd
echo "stop slave; set global sql_slave_skip_counter=1; slave start;"
else
echo `date` "slave is down!!!"
fi

# 远远落后于 master
if [ $Behind -gt 200 ] ; then
echo `date` "slave is behind master $Behind seconds!!!"
fi

#删除临时状态文件
rm -f $StatFile

echo "[/chkslave]"