对于MySQL的完全恢复,我们可以借助于Innobackupex的多重备份加上binlog来将数据库恢复到故障点。这里的完全恢复是相对于时点恢复(也叫不完全恢复)。本文主要演示了基于Innobackupex如何做一个完全恢复,供大家参考。 1、完全恢复的概念 完全恢复是指使用备份
对于MySQL的完全恢复,我们可以借助于Innobackupex的多重备份加上binlog来将数据库恢复到故障点。这里的完全恢复是相对于时点恢复(也叫不完全恢复)。本文主要演示了基于Innobackupex如何做一个完全恢复,供大家参考。
1、完全恢复的概念
完全恢复是指使用备份加上binlog日志将数据库恢复到最新的时间点。
2、演示备份过程
a、创建演示环境
robin@localhost[(none)]> show variables like 'version'; --当前MySQL版本
+---------------+------------+
| Variable_name | Value |
+---------------+------------+
| version | 5.6.12-log |
+---------------+------------+
robin@localhost[(none)]> use tempdb;
robin@localhost[tempdb]> create table tb(id smallint,val varchar(20));
robin@localhost[tempdb]> insert into tb values(1,'fullbak');
--创建一个全备
SHELL> innobackupex --user=robin -password=xxx --port=3606 --socket=/tmp/mysql3606.sock --defaults-file=/etc/my3606.cnf \
> /hotbak/full --no-timestamp
b、创建一个增备
--在创建增备前插入一条记录到tb
robin@localhost[tempdb]> insert into tb values(2,'Incbak');
SHELL> innobackupex --user=robin -password=xxx --port=3606 --socket=/tmp/mysql3606.sock --defaults-file=/etc/my3606.cnf \
> --incremental /hotbak/inc --incremental-basedir=/hotbak/full --no-timestamp
3、演示恢复过程
--再次新增一条记录,该记录在保存在binlog,而不会存在于任何备份,这条记录用于验证完全恢复 robin@localhost[tempdb]> insert into tb values(3,'Inbinlog'); Query OK, 1 row affected (0.01 sec) --当前的binlog位置 robin@localhost[(none)]> show master status; +--------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +--------------------+----------+--------------+------------------+-------------------+ | inst3606bin.000014 | 1200 | | | | +--------------------+----------+--------------+------------------+-------------------+ --使用binlog events命令来查看我们最后insert的一条记录 robin@localhost[(none)]> show binlog events in 'inst3606bin.000014' limit 7,10; +--------------------+------+------------+-----------+-------------+---------------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +--------------------+------+------------+-----------+-------------+---------------------------------------------------+ | inst3606bin.000014 | 668 | Query | 3606 | 751 | BEGIN | | inst3606bin.000014 | 751 | Query | 3606 | 862 | use `tempdb`; insert into tb values(2,'Incbak') | | inst3606bin.000014 | 862 | Xid | 3606 | 893 | COMMIT /* xid=449096 */ | | inst3606bin.000014 | 893 | Query | 3606 | 973 | FLUSH ENGINE LOGS | | inst3606bin.000014 | 973 | Query | 3606 | 1056 | BEGIN | | inst3606bin.000014 | 1056 | Query | 3606 | 1169 | use `tempdb`; insert into tb values(3,'Inbinlog') | | inst3606bin.000014 | 1169 | Xid | 3606 | 1200 | COMMIT /* xid=449997 */ | +--------------------+------+------------+-----------+-------------+---------------------------------------------------+ --查看binlog的位置 robin@localhost[(none)]> show variables like 'log_bin_basename'; +------------------+------------------------------------+ | Variable_name | Value | +------------------+------------------------------------+ | log_bin_basename | /data/inst3606/log/bin/inst3606bin | +------------------+------------------------------------+ a、先做基于全备的apply,注意,此时使用了--redo-only SHELL> innobackupex --apply-log --redo-only --user=robin -password=xxx --port=3606 \ > --defaults-file=/etc/my3606.cnf /hotbak/full b、基于增备的apply, --此时没有--redo-only,如果有多个增备,仅仅最后一个增备无需指定--redo-only SHELL> innobackupex --apply-log --user=robin -password=xxx --port=3606 --defaults-file=/etc/my3606.cnf \ > /hotbak/full --incremental-dir=/hotbak/inc c、进行copy back SHELL> mysqldown -P3606 --copy back前关闭实例 SHELL> netstat -nltp|grep mysql|grep 3606 SHELL> mv /data/inst3606/data3606 /data/inst3606/data3606bk SHELL> mkdir -p /data/inst3606/data3606 SHELL> innobackupex --user=robin -password=xxx --port=3606 --copy-back /hotbak/full --defaults-file=/etc/my3606.cnf SHELL> chown -R mysql:mysql /data/inst3606/data3606 d、启动恢复后的实例 SHELL> mysqld_safe --defaults-file=/etc/my3606.cnf & SHELL> sql -P3606 robin@localhost[(none)]> use tempdb; --如下,我们可以看到记录3, 'Inbinlog'记录并没有被恢复 robin@localhost[tempdb]> se【本文来自鸿网互联 (http://www.68idc.cn)】lect * from tb; +------+---------+ | id | val | +------+---------+ | 1 | fullbak | --Author: Leshami | 2 | Incbak | --Blog : http://blog.csdn.net/leshami +------+---------+ 2 rows in set (0.00 sec) e、使用binlog做完全恢复 SHELL> cd /hotbak/inc/ SHELL> more xtrabackup_binlog_info --从innobackupex获得binlog的位置 inst3606bin.000014 893 --使用mysqlbinlog 追加的最新 SHELL> mysqlbinlog /data/inst3606/log/bin/inst3606bin.000014 --start-position=893 \ > |mysql -urobin -pxxx -P3606 -S /tmp/mysql3606.sock --验证,可以看到第3条记录以及被恢复 SHELL> mysql -urobin -pxxx -P3606 -S /tmp/mysql3606.sock -e "select * from tempdb.tb" Warning: Using a password on the command line interface can be insecure. +------+----------+ | id | val | +------+----------+ | 1 | fullbak | | 2 | Incbak | | 3 | Inbinlog | +------+----------+ 4、小结
f、使用mysqlbinlog方式将日志追加到最新时刻
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