MySQL binlog 自动清理脚本
# vim /data/scripts/delete_mysql_binlog.sh
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#!/bin/bash #======================================================================================= # 用于删除 MySQL Master 端已经同步完的 binlog【需在 Master 端运行】,以减少磁盘空间 # 每天凌晨 5:30 分运行一次 # # 注:需在 Slave 端添加允许 Master 端访问的帐号【帐号:check_binlog,密码:binlog_2356】 # 运行于 MySQL Master 端【目前只用于一主一从的同步模式,对于多从的情况暂时未考虑】 #======================================================================================= PATH= /sbin : /bin : /usr/sbin : /usr/bin : /usr/local/sbin : /usr/local/bin ## Slave端连接信息 SLAVE_ADDR= "XXX.XXX.XXX.XXX" SLAVE_USER= "check_binlog" SLAVE_PWD= "binlog_2356" LOGFILE= "/data/logs/db_sync_info.log" PINGFILE= "/tmp/mysqlping.log" ## MySQL状态信息查看命令 SQLCMD= "show slave status" #======================================================================================= ## 检查MySQL是否已经运行 if [[ ` ps aux | grep mysql[d] | wc -l` - eq 0 ]]; then echo The MySQL is not running at: ` date +%F " " %H-%M-%S` >> ${LOGFILE} exit 1 fi ## 测试Slave端的连通性 nohup mysqladmin -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} ping > ${PINGFILE} retval=` grep "^error" ${PINGFILE}` rm -f ${PINGFILE} if [[ "${retval}X" != "X" ]]; then echo The MySQL Slave can not be connected at: ` date +%F " " %H-%M-%S` >> ${LOGFILE} exit 1 fi ## 检查是否合法的Slave MASTER_ADDR=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e "${SQLCMD}\G;" | awk '$1=="Master_Host:" {print $2}' ` LOCAL_ADDR=` /sbin/ifconfig eth1 | awk -F ':' '/inet addr/{print $2}' | sed 's/[a-zA-Z ]//g' ` if [[ "${MASTER_ADDR}" != "${LOCAL_ADDR}" ]]; then echo The MySQL Slave is not lawful at: ` date +%F " " %H-%M-%S` >> ${LOGFILE} exit 1 fi ## 获得Slave端信息,以此来确定是否处于正常同步的情况 IO_STATUS=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e "${SQLCMD}\G;" | awk '$1=="Slave_IO_Running:" {print $2}' ` SQL_STATUS=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e "${SQLCMD}\G;" | awk '$1=="Slave_SQL_Running:" {print $2}' ` if [[ "${IO_STATUS}" != "Yes" || "${SQL_STATUS}" != "Yes" ]]; then echo The MySQL Replication is not synchronous at: ` date +%F " " %H-%M-%S` >> ${LOGFILE} exit 1 fi ## 再做一次判断,以保证数据同步绝对正常【创建测试数据】 mysql -uroot -e "create database if not exists mytestdb;" sleep 3 retval=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e "show databases;" | grep mytestdb` mysql -uroot -e "drop database if exists mytestdb;" if [[ "${retval}X" = "X" ]]; then echo The MySQL Replication is not synchronous at: ` date +%F " " %H-%M-%S` >> ${LOGFILE} exit 1 fi ## 在已经同步的情况,还需要判断当前同步的binlog,以此来确定哪些已经是过期的binlog SLAVE_BINLOG1=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e "${SQLCMD}\G;" | awk '$1=="Master_Log_File:" {print $2}' ` SLAVE_BINLOG2=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e "${SQLCMD}\G;" | awk '$1=="Relay_Master_Log_File:" {print $2}' ` ## 获得Master端,当前的binlog文件以及binlog路径 MASTER_BINLOG=`mysql -uroot -e "show master status;" | grep - v '^+' | tail -1 | awk '{print $1}' ` ## 主从端已经同步到相同的binlog if [[ "${SLAVE_BINLOG1}" = "${SLAVE_BINLOG2}" && "${SLAVE_BINLOG1}" = "${MASTER_BINLOG}" ]]; then CURR_BINLOG= "${MASTER_BINLOG}" ## 主从端已经同步,但从端的binlog还没有追赶到主端最新的binlog elif [[ "${SLAVE_BINLOG1}" = "${SLAVE_BINLOG2}" && "${SLAVE_BINLOG1}" != "${MASTER_BINLOG}" ]]; then CURR_BINLOG= "${SLAVE_BINLOG1}" ## 主从端已经同步,主从端的binlog一致,但relaylog还不一致 elif [[ "${SLAVE_BINLOG1}" != "${SLAVE_BINLOG2}" && "${SLAVE_BINLOG1}" = "${MASTER_BINLOG}" ]]; then CURR_BINLOG= "${SLAVE_BINLOG2}" else echo Has noknown error at:` date +%F " " %H-%M-%S` >> ${LOGFILE} exit 1 fi mysql -uroot -e "purge binary logs to '${CURR_BINLOG}';" if [[ $? - eq 0 ]]; then echo Clear MySQL binlog is ok at: ` date +%F " " %H-%M-%S` >> ${LOGFILE} fi |
# crontab -e
30 05 * * * /data/scripts/delete_mysql_binlog.sh >/dev/null 2>&1