centos7 centos-home 磁盘空间转移至centos-root下
<p><span style="font-family: 黑体; font-size: 15px"> 由于在安装centos系统的时候，如果在安装时没有分配磁盘空间，选择的是默认分配的，在安装完成后，可以发现大容量磁盘往往分配在了home下面。</span></p><p><span style="font-family: 黑体; font-size: 15px">如果要把home下面的磁盘空间分配到root磁盘下面。可以进行如下操作。</span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)">1.查看CentOS的系统版本</span></p>
<p><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102162556682-2071306105.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 2.查看分区</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">df -h (centos-home和centos-root每人的名字可能不一样) </span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102162702551-1230891453.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 3.备份home分区文件</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">tar cvf /tmp/home.tar /home</span></p>
<p><span style="font-family: 黑体; font-size: 15px"> <img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102162802705-672530806.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 4.卸载/home，如果无法卸载，先终止使用/home文件系统的进程</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">umount /home （卸载）</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102162921675-1937771980.png" alt=""></span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">卸载时，发现/home在使用中，所以先终止。</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">fuser -km /home/（终止）</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163022448-794866552.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px">再次卸载，没有报错，表示成功。</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163104165-1425005239.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 5.删除/home所在的lv</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">lvremove /dev/mapper/centos-home</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163208770-1205102138.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 6.扩展/root所在的lv</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">lvextend -L +100G /dev/mapper/centos-root</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163307969-346247801.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 7.扩展/root文件系统</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">xfs_growfs /dev/mapper/centos-root</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163359398-1215559212.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 8.重新创建home lv （创建时计算好剩余的磁盘容量，建议比剩余小1G左右）</span></p>
<p><span style="font-family: 黑体; font-size: 15px">lvcreate -L 41G -n /dev/mapper/centos-home </span></p>
<p><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163539117-464165311.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 9.创建文件系统</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">mkfs.xfs /dev/mapper/centos-home</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163703387-1689795594.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 10.挂载home</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">mount /dev/mapper/centos-home</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163753324-716500128.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 11.home文件恢复</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">tar xvf /tmp/home.tar -C /home/</span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163848459-986915311.png" alt=""></span></p>
<p><span style="font-family: 黑体; font-size: 15px; color: rgba(255, 0, 0, 1)"> 12.再次使用df -h查看系统磁盘大小</span></p>
<p><span style="font-family: 黑体; font-size: 15px"><img src="https://img2018.cnblogs.com/blog/1331300/201911/1331300-20191102163941754-944626860.png" alt=""></span></p>
<p class="p"><span style="font-family: 黑体; font-size: 15px">可以看到home下面100G的磁盘容量已经转移到root下面了，至此，转移任务结束。此为在CentOS7.2系统下测试使用的，在CentOS6版本下还没测试过。</span></p>
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来源：https://www.cnblogs.com/renshengruxi/p/11782980.html
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