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xtrabackup 备份和恢复docker容器内的mysql

运维开发网 https://www.qedev.com 2021-01-24 13:05 出处:51CTO 作者:carry2021
1.下载备份工具:wgethttps://downloads.percona.com/downloads/Percona-XtraBackup-LATEST/Percona-XtraBackup-8.0.22-15/binary/redhat/7/x86_64/percona-xtrabackup-80-8.0.22-15.1.el7.x86_64.rpm注意xtrabackup8不再有innod

1.下载备份工具:

wget https://downloads.percona.com/downloads/Percona-XtraBackup-LATEST/Percona-XtraBackup-8.0.22-15/binary/redhat/7/x86_64/percona-xtrabackup-80-8.0.22-15.1.el7.x86_64.rpm

注意xtrabackup8不再有innodbackupex

2.docker 启动数据库(mysql 的docker启用默认会读取/etc/mysql/my.cnf,所以要把配置文件放到宿主的一个目录-v进去)

docker run --restart=always --privileged=true -d -v /usr/mysql/conf/:/etc/mysql/ -v /usr/mysql/data:/var/lib/mysql -p 3306:3306 --name mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8.0.21

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

配置文件:

vim /usr/mysql/conf/my.cnf

[client]

#socket = /usr/mysql/mysqld.sock

default-character-set = utf8mb4

[mysqld]

#pid-file = /var/run/mysqld/mysqld.pid

#socket = /var/run/mysqld/mysqld.sock

#datadir = /var/lib/mysql

#socket = /usr/mysql/mysqld.sock

#pid-file = /usr/mysql/mysqld.pid

datadir = /var/lib/mysql

character_set_server = utf8mb4

collation_server = utf8mb4_bin

secure-file-priv= NULL

Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

Custom config should go here

#!includedir /etc/mysql/conf.d/

3.备份方法:

第一步:构造一个自己备份的my.cnf.bak /etc/my.cnf.bak 里面写如下内容:

[mysqld]

datadir=/usr/mysql/data

log-bin=/usr/mysql/data/binlog

log-bin-index=/usr/mysql/data/binlog.index

#socket=/var/lib/mysql/mysql.sock

Disabling symbolic-links is recommended to prevent assorted security risks

#symbolic-links=0

Settings user and group are ignored when systemd is used.

If you need to run mysqld under a different user or group,

customize your systemd unit file for mariadb according to the

instructions in http://fedoraproject.org/wiki/Systemd

#[mysqld_safe]

#log-error=/var/log/mariadb/mariadb.log

#pid-file=/var/run/mariadb/mariadb.pid

#

include all files from the config directory

#

#!includedir /etc/my.cnf.d

第二步:执行备份脚本

xtrabackup --defaults-file=/etc/my.cnf.bak --datadir=/usr/mysql/data --host='10.25.15.86' --user='root' --password='123456' --port=3306 --backup --target-dir=/home/mysqlbackup/FULL-253database-date +%Y-%m-%d-%H-%M-%S

4.模拟删掉数据文件,进行恢复

模拟故障:

docker rm -v mysql -f

再另外一台机器启动:

docker run --restart=always --privileged=true -d -v /usr/mysql/conf/:/etc/mysql/ -v /usr/mysql/data:/var/lib/mysql -p 3306:3306 --name mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8.0.21

删除数据目录

docker stop mysql

cd /usr/mysql/data

rm -rf ./*

注意这里指定的配置文件时Docker容器mysql的配置文件

xtrabackup --defaults-file=/usr/mysql/conf/my.cnf --prepare --target-dir=/home/mysqlbackup/FULL-253database-2021-01-22-23-34-04/

/usr/mysql/conf/my.cnf修改datadir=/usr/mysql/data

xtrabackup --defaults-file=/usr/mysql/conf/my.cnf --copy-back --target-dir=/home/mysqlbackup/FULL-253database-2021-01-22-23-34-04/

然后/usr/mysql/conf/my.cnf再修改 datadir=/var/lib/mysql

docker start mysql

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