MYSQL增量备份

原贴:http://flutey.3322.org/node/96

MYSQL增量备份
数据库

#!/bin/sh
#+++++++++++++mysqlback++++++++++++
#a mysql incremental backup script.
#by flute
#++++++++++++++++++++++++++++++++++
BAK_DIR="."
while getopts :u:p:d:c OPTION
do
  case ${OPTION} in
      u)
          DB_USER=${OPTARG}
          ;;
      p)
          PASSWD=${OPTARG}
          ;;
      d)
          DB_NAME=${OPTARG}
          ;;
      b)
          BAK_DIR=${OPTARG}
          ;;
      c)
          INIT="true"
          ;;
      /?)
      echo "Usage: mysqlback.sh [OPTIONS]"
      echo "-u        user for login"
      echo "-p        Password to use when connecting to server"
      echo "-d        which database to backup"
      echo "-b        backup database files to directory,default is current directory"
      echo "-c        must be usage for first backup,is complete backup"
      exit 1
      ;;
  esac
done

MYSQL_BIN=/usr/local/mysql/bin
DATADIR=`${MYSQL_BIN}/mysql -u ${DB_USER} -p${PASSWD} -e "show variables like 'datadir'" | sed -n '2p' | awk '{print $NF}'`
upfile ()    #上传文件
{
    _FNAME=$1
    _TNAME=`echo ${_FNAME}|sed 's//.sql//g'`
    _TNAME="${_TNAME}.tgz"
    tar -czf ${_TNAME} ${_FNAME}
    if [ $? = 0 ]
        then
        scp ${_TNAME} 192.168.1.10:/usr/local/mysql/bak
        if [ $? = 0 ]
            then
            echo "upfile success."
        else
            logger -f ~/mysqlbak.log -t MYSQLBAK 'upload file ${_TNAME} failed'
            ssh 192.168.1.10 "logger -f ~/mysqlbak.log -t MYSQLBAK 'upload file ${_TNAME} failed'"
        fi
    else
        echo "tar file failed."
    fi
}
bak_file ()    #获取备份文件名
{
    _DB_NAME=$1
    _BAK_DIR=$2
    _BDATE=`date "+%Y-%m-%d"`
    _BAKFILE="${_BAK_DIR}/_${_DB_NAME}_${_BDATE}.sql"
    if [ ! -f ${_BAKFILE} ]
    then
        echo ${_BAKFILE}
        return 0
    else
    ID=1
    while [ 1 ]
          do
          _BAKFILE="${_BAK_DIR}/_${_DB_NAME}_${_BDATE}_${ID}.sql"
          if [ ! -f ${_BAKFILE} ]
              then
              echo ${_BAKFILE}
              return 0
          fi
          ID=`expr $ID + 1`
    done
        
    fi
}
#进行完全备份
if [ "${INIT}" = "true" ]   
then
    BDATE=`date "+%Y-%m-%d"`
    FILENAME="${DB_NAME}_${BDATE}.sql"
    ${MYSQL_BIN}/mysqldump --opt -x -u ${DB_USER} -p${PASSWD} ${DB_NAME} > ${FILENAME} &
    BINLOG=`tail -n 1 ${DATADIR}*-bin.index | sed 's//.////g'`
    logdate=`ls -l ${DATADIR}${BINLOG} | awk '{print $6, $7, $8}'`
    logdate=`date -d "$logdate" "+%Y-%m-%d %H:%M:00"`
    POSITION=`$MYSQL_BIN/mysqlbinlog --start-datetime="$logdate" --database=${DB_NAME} ${DATADIR}${BINLOG} | grep "# at [0-9]/{1,/}" | tail -n 1 | sed 's/#/ at/ //g'`
    echo "${POSITION}  ${BINLOG}" > mysqlback.ini   #记录增量备份起始点
    upfile ${FILENAME}
    exit
fi
#增量备份
BEG_POS=`cat mysqlback.ini | awk '{print $1}'`
BEG_LOG=`cat mysqlback.ini | awk '{print $2}'`
END_LOG=`tail -n 1 ${DATADIR}/*-bin.index | sed 's//.////g'`
LOG_FILES=`grep -A 3 "${BEG_LOG}" ${DATADIR}/*-bin.index | sed 's//.////g'`
logdate=`ls -l ${DATADIR}${END_LOG} | awk '{print $6, $7, $8}'`
logdate=`date -d "$logdate" "+%Y-%m-%d %H:%M:00"`
END_POS=`$MYSQL_BIN/mysqlbinlog --start-datetime="$logdate" --database=$DB_NAME ${DATADIR}$END_LOG | grep "# at [0-9]/{1,/}" | tail -n 1 | sed 's/#/ at/ //g'`
echo "begain position:$BEG_POS"
FILENAME=`bak_file ${DB_NAME} ${BAK_DIR}`
if [ `echo ${FILENAME}|grep "_[0-9]/{1,/}.sql"` ]
then
    OFFSET='--offset=1'
fi
END_POS=`expr ${END_POS} + 1`
err=0
for loop in ${LOG_FILES}
do
  if [ ${BEG_LOG} = ${END_LOG} ]
      then
      ${MYSQL_BIN}/mysqlbinlog -s -u ${DB_USER} -p${PASSWD} ${OFFSET} --start-position=${BEG_POS} --stop-position=${END_POS} --database=${DB_NAME} ${DATADIR}${loop} >> ${FILENAME}
  elif [ ${END_LOG} = ${loop} ]
      then
      ${MYSQL_BIN}/mysqlbinlog -s -u ${DB_USER} -p${PASSWD} --database=${DB_NAME} --stop-position=${END_POS} ${DATADIR}${loop} >> ${FILENAME}
  elif [ ${BEG_LOG} = ${loop} ]
      then
      ${MYSQL_BIN}/mysqlbinlog -s -u ${DB_USER} -p${PASSWD} ${OFFSET} --start-position=${BEG_POS} --database=${DB_NAME} ${DATADIR}${loop} > ${FILENAME}
  else
      ${MYSQL_BIN}/mysqlbinlog -s -u ${DB_USER} -p${PASSWD} --database=${DB_NAME} ${DATADIR}${loop} >> ${FILENAME}
  fi
  if [ $? != 0 ]
      then
      err=1
  fi
done

if [ $err = 0 ]
then
    END_POS=`expr ${END_POS} - 1`
    echo "end position:${END_POS}"
    echo "${END_POS}  ${END_LOG}" > mysqlback.ini
    upfile ${FILENAME}
    echo "mysql back success."
else
    rm ${FILENAME}
    logger -f ~/mysqlbak.log -t MYSQLBAK 'Bakckup to $FILENAME failed with start position:$BEG_POS and end position:$END_POS.'
    ssh 192.168.1.10 "logger -f ~/mysqlbak.log -t MYSQLBAK 'Bakckup to $FILENAME failed with start position:$BEG_POS and end position:$END_POS.'"
fi