使用perconna xtrabackup备份脚本

　　使用percona xtrabackup对两个数据库实例进行备份，备份的脚本如下所示：

 #!/bin/bash
 BASEDIR="/usr/local/mysql"
 BIN="$BASEDIR/bin"
 MYDUMPE="/usr/local/bin/mydumper"
 XTRABACKUP="/usr/bin/xtrabackup"
 DATA1_HOME="$BASEDIR/mysqldata/data1"
 DATA1_MYCNF="$DATA1_HOME/my.cnf"
 DATA1_SOCK=`grep socket $DATA1_MYCNF|awk '{print $3}'`
 DATA1_PORT=`grep port $DATA1_MYCNF|awk '{print $3}'`
 DATA1_IP=`grep bind-address $DATA1_MYCNF|awk '{print $3}'`

 DATA2_HOME="$BASEDIR/mysqldata/data2"
 DATA2_MYCNF="$DATA2_HOME/my.cnf"
 DATA2_SOCK=`grep socket $DATA2_MYCNF|awk '{print $3}'`
 DATA2_PORT=`grep port $DATA2_MYCNF|awk '{print $3}'`
 DATA2_IP=`grep bind-address $DATA2_MYCNF|awk '{print $3}'`

 USER="root"
 PASSWORD=""
 BACKUPPATH_LOCAL="/usr/local/mysql/mysqldata/databak"
 BACKUPPATH_REMOTE="/usr/local/mysql/databak"
 #get the first day  of one week,all backup directory is named by date,the incremental-basedir is the first day of the week
 DATE="`date +%F`"
 # get the day number of today in this week,monday is ,sunday is  as the first day of this week
 WEEKDAY="`date +%u`"
 AGO="$WEEKDAY days ago"
 WEEKNUM=`date +%U`
 #get the first day of one week,as the incremental_back_base
 WEEK_FIRST_DAY=`date -d "$AGO" +%F`
 TODAY_DIR="$BACKUPPATH_LOCAL/today"

 # the full backup function
 full_backup(){
     local DEFAULTS_FILE=$
     local USER=$
     local PASSWORD=$
     local SOCKET=$
     local TARGET_DIR=$
     local LOG_FILE=$
     $BIN/mysql --user=$USER  --password=$PASSWORD -S $SOCKET -e "stop slave;"
     $XTRABACKUP  --defaults-file=$DEFAULTS_FILE --backup --user=$USER --password=$PASSWORD --socket=$SOCKET --target-dir=$TARGET_DIR >$LOG_FILE >&
     $BIN/mysql --user=$USER  --password=$PASSWORD -S $SOCKET -e "start slave;"

 }
 # the incremental backup function
 incremental_backup(){
   local DEFAULTS_FILE=$
   local USER=$
   local PASSWORD=$
   local SOCKET=$
   local TARGET_DIR=$
   local LOG_FILE=$
     local BASE_DIR=$
     local NAME=$
     $BIN/mysql --user=$USER  --password=$PASSWORD -S $SOCKET -e "stop slave;"
   $XTRABACKUP  --defaults-file=$DEFAULTS_FILE --backup --user=$USER --password=$PASSWORD --socket=$SOCKET --incremental-basedir=$BASE_DIR --target-dir=$TARGET_DIR >$LOG_FILE >&
   #$XTRABACKUP  --defaults-file=$DEFAULTS_FILE --backup --user=$USER --password=$PASSWORD --socket=$SOCKET --compression --stream=xbstream  --incremental-basedir=$BASE_DIR --target-dir=$TARGET_DIR >$DATE-$NAME.tar
     $BIN/mysql --user=$USER  --password=$PASSWORD -S $SOCKET -e "start slave;"
 }
 # check the mysql is running or not,if mysql is not running ,the backup will cancel
 mysql_check(){
     local SOCKET=$
     local IP=$
     local PORT=$
     local NAME=$
     if [ `ps -ef|grep $SOCKET|grep -Ev grep|wc -l` -ge   ] && [ `netstat -ltnp|grep $IP:$PORT|grep -Ev grep|wc -l` -eq   ]
     then
         echo " THE MYSQL SERVER $NAME  IS RUNNING"
         return
     else
         echo "THE MYSQL SERVER $NAME  IS NOT RUNNING"
         return
     fi
 }

 # main
 # delete yesterday backup in TODAY directory
 /bin/mv  $TODAY_DIR/* $BACKUPPATH_LOCAL

 [ -e  $TODAY_DIR  ] || mkdir -p $TODAY_DIR
 [ -e "$BACKUPPATH_LOCAL/$DATE" ] || mkdir -p "$BACKUPPATH_LOCAL/$DATE"
 cd  "$BACKUPPATH_LOCAL/$DATE"

 TARGET_DIR="$BACKUPPATH_LOCAL/$DATE"

 # if today is sunday,the backup type is full_backup,else the backup type is delta backup on the sunday full backup
 if [ $WEEKDAY -eq 7 ]
     then
         mysql_check $DATA1_SOCK    $DATA1_IP $DATA1_PORT "DATA1"
         [ $? -eq 1  ] && full_backup $DATA1_MYCNF $USER $PASSWORD $DATA1_SOCK $TARGET_DIR/data1 "$TARGET_DIR/data1.log"
         mysql_check $DATA2_SOCK    $DATA2_IP $DATA2_PORT "DATA2"
         #echo $TARGET_DIR
         [ $? -eq 1  ] && full_backup $DATA2_MYCNF $USER $PASSWORD $DATA2_SOCK $TARGET_DIR/data2 "$TARGET_DIR/data2.log"
     else
         BASE_DIR=$BACKUPPATH_LOCAL/$WEEK_FIRST_DAY
         mysql_check $DATA1_SOCK    $DATA1_IP $DATA1_PORT "DATA1"
         [ $? -eq 1  ] && incremental_backup $DATA1_MYCNF $USER $PASSWORD $DATA1_SOCK $TARGET_DIR/data1 $TARGET_DIR/data1.log $BASE_DIR/data1 data1
         mysql_check $DATA2_SOCK    $DATA2_IP $DATA2_PORT "DATA2"
         [ $? -eq 1  ] && incremental_backup $DATA2_MYCNF $USER $PASSWORD $DATA2_SOCK $TARGET_DIR/data2 $TARGET_DIR/data2.log $BASE_DIR/data2 data2
 fi
 # copy today backup to TODAY directory,the NBU server will catch TODAY directory
 #/bin/mv -ar $TARGET_DIR $TODAY_DIR

 /bin/mv  $TARGET_DIR $TODAY_DIR

　　主要实现的功能是，每周日早上进行一次全备份操作，然后周内的每天，基于周日的全备，做一个增量备份的操作，每个实例备份的结果，放在以实例命名的目录下，每天忙备份的结果，放在以当前日期命名的目录下。

　　备份脚本对应的删除脚本，实现的功能是这样的，每周日，也就是全备的时候，去删除上上周的所有备份，保留上周的所有备份，这个时候要判断上上周的日期，并且找到所有这些目录，实现的脚本如下：

　　

 # delete the backup ,delete  days ago full backup and the incremental backup based on that full backup

 BACKUPPATH=/usr/local/mysql/mysqldata/databak
 DATE=`date +%F`

 DELETE_DATE_SUNDAY=`date -d "14 days ago" +%F`
 for index in {-,-,-,-,-,-}
 do
     DELETE_DATE_WEEKDAY=`date -d "$index days ago $DELETE_DATE_SUNDAY" +%F`
     DELETE_DATE_DIR=$BACKUPPATH/$DELETE_DATE_WEEKDAY
     [ -e $DELETE_DATE_DIR  ] && rm -rf $DELETE_DATE_DIR
 done

 [ -e $BACKUPPATH/$DELETE_DATE_SUNDAY  ] && rm -rf $BACKUPPATH/$DELETE_DATE_SUNDAY

　　在做主从备份的同时，需要对主服务器上面的binlog进行实时同步到从服务器上，因为主服务器上的binlog会被覆盖掉，所以需要在备份的从服务器上保留完整的binlog信息。具体的操作命令是

/usr/local/mysql/bin/mysqlbinlog --raw --read-from-remote-server --stop-never --host=*.*.*.* --port=**** --user=replication --password=**** mysql-bin. --result-file=/usr/local/mysql/mysqldata/master_binlog_bak/data1/back- &

　　这行命令的主要功能是从远方的服务器上同步binlog，-raw是指binlog 的格式，stop-never是指不中断的去同步，host和port、user和passeord是有replication权限的用户，后面要跟一个binlog 名称，也就是master主机上的binlog.index中存在的binlog文件名，result-file是要写一个目录名，如果除了目录名，还有其他的字段，那就是定义了目标文件的命名规则。比如/usr/local/mysql/mysqldata/databak/back-，则文件名称为back-mysql-bin.0000*.