检查mysql主从同步 #!/bin/sh PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin LOGFILE=/data/repair_mysql_sync_`date +%F`.log SQLCMD1="show slave status" ## 查看MySQL是否已启动 if [[ `ps aux | grep mysqld | grep -v grep`"X" = "X" ]]; then echo The MySQL is not running at: `date +%F" "%H-%M-%S` >> ${LOGFILE} exit 1 fi ## 获得MySQL从端Relay binlog的路径 retval=`grep "^relay-log" /etc/my.cnf | grep -v relay-log- | grep ‘/‘` if [[ "${retval}" = "X" ]]; then RELAY_BINLOG_PATH=`ps aux | grep -w mysqld | grep -v grep | awk ‘{print $13}‘ | awk -F ‘=‘ ‘{print $2}‘` else RELAY_BINLOG_PATH=`dirname $(echo ${retval} | awk -F ‘=‘ ‘{print $2}‘)` fi ## 查找master.info文件,用于定位Binlog信息 MASTER_FILE=`ps aux | grep -w mysqld | grep -v grep | awk ‘{print $13}‘ | awk -F ‘=‘ ‘{print $2}‘`/master.info if [[ ! -e ${MASTER_FILE} ]]; then echo This Server is not MySQL Slave at: `date +%F" "%H-%M-%S` >> ${LOGFILE} exit 1 fi ## 获得当前的同步状态 IO_STATUS=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Slave_IO_Running:" {print $2}‘` SQL_STATUS=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Slave_SQL_Running:" {print $2}‘` if [[ "${IO_STATUS}" = "Yes" && "${SQL_STATUS}" = "Yes" ]]; then echo Now, The MySQL Replication is synchronous at: `date +%F" "%H-%M-%S` >> ${LOGFILE} exit 0 fi ## 从master.info文件中,获得MySQL主端的同步信息 REPLI_INFO=`sed ‘/^$/d‘ ${MASTER_FILE} | tail +2 | head -5` REPLI_BINLOG_FILE=`echo ${REPLI_INFO} | awk ‘{print $1}‘` REPLI_IPADDR=`echo ${REPLI_INFO} | awk ‘{print $3}‘` REPLI_USER=`echo ${REPLI_INFO} | awk ‘{print $4}‘` REPLI_PWD=`echo ${REPLI_INFO} | awk ‘{print $5}‘` ## 删除无用的Relay binlog rm -rf ${RELAY_BINLOG_PATH}/*-relay-bin.* ## 直接从0位置开始同步 SQLCMD2="change master to master_host=‘${REPLI_IPADDR}‘, master_user=‘${REPLI_USER}‘, master_password=‘${REPLI_PWD}‘," SQLCMD2="${SQLCMD2} master_log_file=‘${REPLI_BINLOG_FILE}‘, master_log_pos=0" mysql -uroot -e "stop slave;" mysql -uroot -e "${SQLCMD2};" mysql -uroot -e "start slave;" ## 如果同步的过程中,出现重复记录导致同步失败,就跳过 while true do sleep 2 IO_STATUS=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Slave_IO_Running:" {print $2}‘` SQL_STATUS=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Slave_SQL_Running:" {print $2}‘` BEHIND_STATUS=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Seconds_Behind_Master:" {print $2}‘` SLAVE_BINLOG1=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Master_Log_File:" {print $2}‘` SLAVE_BINLOG2=`mysql -uroot -e "${SQLCMD1}\G;" | awk ‘$1=="Relay_Master_Log_File:" {print $2}‘` ## 出现错误,就将错误信息记录到日志文件,并跳过错误继续同步 if [[ "${IO_STATUS}" != "Yes" || "${SQL_STATUS}" != "Yes" ]]; then ERRORINFO=`mysql -uroot -e "${SQLCMD1}\G;" | awk -F ‘: ‘ ‘$1=="Last_Error" {print $2}‘` echo "The MySQL synchronous error information: ${ERRORINFO}" >> ${LOGFILE} mysql -uroot -e "stop slave;" mysql -uroot -e "set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;" mysql -uroot -e "start slave;" ## 已完成同步,就正常退出 elif [[ "${IO_STATUS}" = "Yes" && "${SQL_STATUS}" = "Yes" && "${SLAVE_BINLOG1}" = "${SLAVE_BINLOG2}" && ${BEHIND_STATUS} -eq 0 ]]; then echo The MySQL synchronous is ok at: `date +%F" "%H-%M-%S` >> ${LOGFILE} break fi done
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原文地址:http://hashlinux.blog.51cto.com/9647696/1865729