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docs(docker): 更新volume备份步骤
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docs/docker/storage/[docker volume]创建和管理卷.md

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基本原理:将卷挂载到容器中,通过`tar`命令打包
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创建新的容器`dbstore`,挂载卷到路径`/dbdata`
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* 第一步:创建新的容器`dbstore`,挂载卷到路径`/dbdata`
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```
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$ docker run --rm -it -v VOLUME_NAME:/dbdata --name dbstore ubuntu /bin/bash
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```
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新建一个窗口
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* 启动新容器并挂载容器`dbstore`
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* 挂载本地文件夹到容器目录`/backup`
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* 执行`tar`命令,打包`/dbdata`目录到`/backup/backup.tar`
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* 第二步:新建一个窗口
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* 启动新容器并挂载容器`dbstore`
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* 挂载本地文件夹到容器目录`/backup`
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* 执行`tar`命令,打包`/dbdata`目录到`/backup/backup.tar`
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```
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$ docker run --rm --volumes-from dbstore -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /dbdata

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