CentOS 7 缩小 /home 分区扩展 root 分区记录 |
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由于安装 CentOS 系统时使用的默认分区配置，导致 / 目录只有 50G，而 /home [根目录]则有 392G。 分配严重不合理，所以需要减少 /home 空间分配给 / 根目录。 首先需要压缩备份 /home 至 /root/ 或其他目录下 [root@node159 ~]$ tar -czvf /root/home.tgz -C /home 复制代码查看当前磁盘分区情况 [root@node159 ~]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 5.5G 45G 11% / devtmpfs 7.3G 0 7.3G 0% /dev tmpfs 7.3G 0 7.3G 0% /dev/shm tmpfs 7.3G 27M 7.3G 1% /run tmpfs 7.3G 0 7.3G 0% /sys/fs/cgroup /dev/sda1 1014M 143M 872M 15% /boot /dev/mapper/centos-home 392G 33M 392G 1% /home 复制代码卸载 /home 分区 [root@node159 ~]$ umount /home umount: /home: target is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) 复制代码若提示占用则强制卸载 [root@node159 ~]$ umount -lf /home 复制代码减少 /home 分区 200G 空间 [root@node159 ~]$ lvreduce -L -200G /dev/mapper/centos-home WARNING: Reducing active and open logical volume to Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================================================================================================== Package Arch Version Repository Size ================================================================================================================================================================================================================================================== Installing: psmisc x86_64 22.20-17.el7 base 141 k Transaction Summary ================================================================================================================================================================================================================================================== Install 1 Package Total download size: 141 k Installed size: 475 k Downloading packages: psmisc-22.20-17.el7.x86_64.rpm | 141 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction psmisc-22.20-17.el7.x86_64 was supposed to be installed but is not! Verifying : psmisc-22.20-17.el7.x86_64 1/1 Verifying : psmisc-22.20-17.el7.x86_64 2/1 Failed: psmisc.x86_64 0:22.20-17.el7 Complete! 复制代码只好下载安装包手动安装 下载链接 [root@node159 ~]$ yum localinstall psmisc-22.20-17.el7.x86_64.rpm Loaded plugins: fastestmirror Examining psmisc-22.20-17.el7.x86_64.rpm: psmisc-22.20-17.el7.x86_64 Marking psmisc-22.20-17.el7.x86_64.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package psmisc.x86_64 0:22.20-17.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================================================================================================== Package Arch Version Repository Size ================================================================================================================================================================================================================================================== Installing: psmisc x86_64 22.20-17.el7 /psmisc-22.20-17.el7.x86_64 475 k Transaction Summary ================================================================================================================================================================================================================================================== Install 1 Package Total size: 475 k Installed size: 475 k Is this ok [y/d/N]: y Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : psmisc-22.20-17.el7.x86_64 1/1 Verifying : psmisc-22.20-17.el7.x86_64 1/1 Installed: psmisc.x86_64 0:22.20-17.el7 Complete! 复制代码继续正常步骤，使用 fuser 解除占用并删除卷 [root@node159 ~]$ fuser -kuc /dev/mapper/centos-home [root@node159 ~]$ lvremove -f /dev/mapper/centos-home Logical volume "home" successfully removed 复制代码重新创建 home 卷，分配大小为 190G [root@node159 ~]$ lvcreate -L 190GB -n home centos WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y Wiping xfs signature on /dev/centos/home. Logical volume "home" created. 复制代码格式化新分区 [root@node159 ~]$ mkfs.xfs /dev/centos/home meta-data=/dev/centos/home isize=512 agcount=4, agsize=12451840 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=49807360, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=24320, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 复制代码再次挂载到 /home 下，查看分区是否成功 [root@node159 ~]$ mount /dev/mapper/centos-home [root@node159 ~]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 250G 5.4G 245G 3% / devtmpfs 7.3G 0 7.3G 0% /dev tmpfs 7.3G 0 7.3G 0% /dev/shm tmpfs 7.3G 27M 7.3G 1% /run tmpfs 7.3G 0 7.3G 0% /sys/fs/cgroup /dev/sda1 1014M 143M 872M 15% /boot tmpfs 1.5G 0 1.5G 0% /run/user/0 /dev/mapper/centos-home 190G 33M 190G 1% /home 复制代码将剩余没分配完的空间全部分给根目录 / [root@node159 ~]$ lvextend -r -l +100%FREE /dev/mapper/centos-root Size of logical volume centos/root changed from 250.00 GiB (64000 extents) to 251.62 GiB (64415 extents). Logical volume centos/root successfully resized. meta-data=/dev/mapper/centos-root isize=512 agcount=20, agsize=3276800 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=65536000, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=6400, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 65536000 to 65960960 复制代码恢复 /home 备份 [root@node159 ~]$ tar -xzvf /root/home.tgz -C /home 复制代码以上就是一次完整的扩缩容分区过程，其中一些命令及参数并不明白，需要查资料学习了解。 原文地址 blog.csdn.net |
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