xtrabackup备份mysql

安装依赖关系wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo yum -y install perl perl-devel libaio libaio-devel perl-Time-HiRes perl-DBD-MySQL下载软件包，并安装软件wget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.4/binary/redhat/6/x86_64/percona-xtrabackup-24-2.4.4-1.el6.x86_64.rpm yum -y install percona-xtrabackup-24-2.4.4-1.el6.x86_64.rpm创建备份帐号grant all on *.* to smile@‘localhost‘ identified by ‘123456‘;FLUSH PRIVILEGES;创建备份目录mkdir /data/mysqlbackup -p备份先进行第一次全备innobackupex --defaults-file=/etc/my.cnf --user=smile --password=123456 --socket=/data/mysql/mysql.sock --no-timestamp /data/mysqlbackup/xfull第一次增备innobackupex --user=smile --password=123456 --incremental --no-timestamp --incremental-basedir=/data/mysqlbackup/xfull /data/mysqlbackup/xinc1第二次增备innobackupex --user=smile --password=123456 --incremental --no-timestamp --incremental-basedir=/data/mysqlbackup/xinc1 /data/mysqlbackup/xinc2参数说明:

--incremental：开启增量备份功能

--incremental-basedir：上一次备份的路径

恢复准备恢复前准备　　恢复数据前的准备(合并xtabackup_log_file和备份的物理文件)将redo进行重做，已提交的写到数据文件，未提交的使用undo回滚，模拟CSR的过程　第一步：先应用全备日志（--apply-log，在全备中apply-log时，只应用redo，不应用undo） innobackupex --apply-log --redo-only /data/mysqlbackup/xfull/ 第二步：合并增量到全备中xinc1到full中，并且apply-log，只应用redo，不应用undo innobackupex --apply-log --redo-only --incremental-dir=/data/mysqlbackup/xinc1 /data/mysqlbackup/xfull/ 第三步：合并增量到全备中xinc2到full中，redo和undo都应用 innobackupex --apply-log --incremental-dir=/data/mysqlbackup/xinc2 /data/mysqlbackup/xfull/ 第四步：整体full执行apply-log，redo和undo都应用 innobackupex --apply-log /data/mysqlbackup/xfull/使用innobackupex命令进行恢复 innobackupex --copy-back /data/mysqlbackup/xfull/ 授权：chown -R mysql:mysql /data/mysql

 

启动数据库systemctl start mysqld

 

如果启动时出现如下两种报错：

错误1： 

2019-06-10T11:42:10.068237+08:00 0 [ERROR] InnoDB: Unable to open undo tablespace ‘.//undo001‘.2019-06-10T11:42:10.068267+08:00 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error2019-06-10T11:42:10.668794+08:00 0 [ERROR] Plugin ‘InnoDB‘ init function returned error.2019-06-10T11:42:10.668841+08:00 0 [ERROR] Plugin ‘InnoDB‘ registration as a STORAGE ENGINE failed.2019-06-10T11:42:10.668848+08:00 0 [ERROR] Failed to initialize builtin plugins.2019-06-10T11:42:10.668862+08:00 0 [ERROR] Aborting2019-06-10T11:42:10.033459+08:00 0 [Note] /usr/local/mysql/bin/mysqld (mysqld 5.7.26-log) starting as process

错误2：

2019-06-10T11:42:10.068237+08:00 0 [ERROR] InnoDB: Unable to open undo tablespace ‘.//undo001‘.2019-06-10T11:42:10.068267+08:00 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error2019-06-10T11:42:10.668794+08:00 0 [ERROR] Plugin ‘InnoDB‘ init function returned error.2019-06-10T11:42:10.668841+08:00 0 [ERROR] Plugin ‘InnoDB‘ registration as a STORAGE ENGINE failed.2019-06-10T11:42:10.668848+08:00 0 [ERROR] Failed to initialize builtin plugins.2019-06-10T11:42:10.668862+08:00 0 [ERROR] Aborting

 

到数据目录下删除redo undo日志  rm -f ib_* rm -f ibdata1 ibtmp1 如果不想这样可以在my.cnf中加入如下配置，但加入需要重新初始化：innodb_max_undo_log_size = 128Minnodb_undo_log_truncate = ONinnodb_undo_logs = 128innodb_undo_tablespaces = 3innodb_purge_rseg_truncate_frequency = 10

xtrabackup备份mysql

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