使用xtrabackup备份mysql8.0.16

2019独角兽企业重金招聘Python工程师标准>>>

Percona XtraBackup 8.0支持备份mysql8，之前的Percona XtraBackup 2.x 只能备份到5.7

一、主库备份恢复

/usr/bin/xtrabackup  --defaults-file=/etc/3306.cnf --login-path=root3306 --backup --target-dir=/data/backup/***
xtrabackup --prepare --target-dir=/data/backup/***
mv /data/backup/*** /data/3306 
chown -R mysql.mysql /data/3306
systemctl start 3306

二、利用主库的备份文件创建新的从库(多个从库同样)

/usr/bin/xtrabackup  --defaults-file=/etc/3306.cnf --login-path=root3306 --backup --target-dir=/data/backup/***
rsync -av /data/backup/*** rsync://......
xtrabackup --prepare --target-dir=/data/......
cp -a /data/...... /data/3306
chown -R mysql.mysql /data/3306
systemctl start 3306
cd /data/3306
cat xtrabackup_binlog_info 
change master ...

三、利用从库的备份文件创建一个基于主库的从库（重点）

在从库上备份
/usr/bin/xtrabackup  --defaults-file=/etc/3306.cnf --login-path=root3306 --backup --slave-info --target-dir=/data/backup/***
多--slave-info 这个参数
同步到第二个从库机器上
rsync -av /data/backup/*** rsync://......
xtrabackup --prepare --target-dir=/data/......
cp -a /data/...... /data/3306
chown -R mysql.mysql /data/3306
systemctl start 3306
cd /data/3306
这里既不是看xtrabackup_slave_info，也不是xtrabackup_binlog_info，百度谷歌了全地球，发现这个主从配置信息在备份的时候根本就没更新到xtrabackup_slave_info文件里，最后想起来去看看备份时候的日志，才找到了正确的position。
reset slave;
change master ...
start slave;
show slave status\G;

记录一下错误日志

2019-05-14T10:56:05.646593+08:00 0 [ERROR] [MY-010544] [Repl] Failed to open the relay log './mysql-relay-bin.000054' (relay_log_pos 1581814).
2019-05-14T10:56:05.646605+08:00 0 [ERROR] [MY-011059] [Repl] Could not find target log file mentioned in relay log info in the index file './mysql-relay-bin.index' during relay log initialization.
2019-05-14T10:56:05.649213+08:00 0 [ERROR] [MY-010426] [Repl] Slave: Failed to initialize the master info structure for channel ''; its record may still be present in 'mysql.slave_master_info' table, consider deleting it.
2019-05-14T10:56:05.649228+08:00 0 [ERROR] [MY-010529] [Repl] Failed to create or recover replication info repositories.

2019-05-14T10:58:37.208543+08:00 9 [ERROR] [MY-013124] [Repl] Slave SQL for channel '': Slave failed to initialize relay log info structure from the repository, Error_code: MY-013124

Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master; the first event 'mysql-bin.000031' at 1581814, the last event read from './mysql-bin.000031' at 124, the last byte read from './mysql-bin.000031' at 1581833.'

转载于:https://my.oschina.net/longquan/blog/3049453