如何给centos系统扩展磁盘分区

本篇内容主要讲解"如何给centos系统扩展磁盘分区"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"如何给centos系统扩展磁盘分区"吧!

问题/故障/场景/需求

eve-ng的虚拟机ova的硬盘只有38g，需要增加空间，在vmware直接扩展硬盘后，重启系统，使用fdisk -l可以看到硬盘扩大了，但文件系统并没有扩大，还需要将这些新增的空间扩展分配到某个文件系统才行。下面记录了整个扩展过程

解决方法/步骤

在vm里扩大磁盘到250g重启系统后，查看当前的文件系统的情况

root@eve-ng:~# df -hfilesystem          size used avail use% mounted onudev             7.9g   0 7.9g  0% /devtmpfs             1.6g  19m 1.6g  2% /run/dev/mapper/eve--ng--vg-root  38g  13g  23g 36% /tmpfs             7.9g   0 7.9g  0% /dev/shmtmpfs             5.0m   0 5.0m  0% /run/locktmpfs             7.9g   0 7.9g  0% /sys/fs/cgroup/dev/sda1           472m  83m 365m 19% /bootroot@eve-ng:~# fdisk -l...省略部分内容disk /dev/sda: 250 gib, 268435456000 bytes, 524288000 sectors  //可以看到已经有250g了units: sectors of 1 * 512 = 512 bytessector size (logical/physical): 512 bytes / 512 bytesi/o size (minimum/optimal): 512 bytes / 512 bytesdisklabel type: dosdisk identifier: 0x3e3ca055device   boot  start   end sectors size id type/dev/sda1 *    2048  999423  997376 487m 83 linux/dev/sda2    1001470 83884031 82882562 39.5g 5 extended/dev/sda5    1001472 83884031 82882560 39.5g 8e linux lvmdisk /dev/mapper/eve--ng--vg-root: 38.6 gib, 41406169088 bytes, 80871424 sectorsunits: sectors of 1 * 512 = 512 bytessector size (logical/physical): 512 bytes / 512 bytesi/o size (minimum/optimal): 512 bytes / 512 bytesdisk /dev/mapper/eve--ng--vg-swap_1: 980 mib, 1027604480 bytes, 2007040 sectorsunits: sectors of 1 * 512 = 512 bytessector size (logical/physical): 512 bytes / 512 bytesi/o size (minimum/optimal): 512 bytes / 512 bytes//下面执行分区root@eve-ng:~# fdisk /dev/sdawelcome to fdisk (util-linux 2.27.1).changes will remain in memory only, until you decide to write them.be careful before using the write command.command (m for help): npartition type  p  primary (1 primary, 1 extended, 2 free)  l  logical (numbered from 5)select (default p): ppartition number (3,4, default 3): 3first sector (999424-524287999, default 999424): 83884032 //注意，这里是之前分配的最后一块（sda5 end）加一（83884031+1）last sector, +sectors or +size{k,m,g,t,p} (83884032-524287999, default 524287999): //注意看这是不是最后一块created a new partition 3 of type 'linux' and of size 210 gib.command (m for help): tpartition number (1-3,5, default 5): 3 3partition type (type l to list all types): 8echanged type of partition 'linux' to 'linux lvm'.command (m for help): wthe partition table has been altered.calling ioctl() to re-read partition table.re-reading the partition table failed.: device or resource busythe kernel still uses the old table. the new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).root@eve-ng:~# rebootroot@eve-ng:~# pvcreate /dev/sda3 physical volume "/dev/sda3" successfully createdroot@eve-ng:~# vgdisplay --- volume group --- vg name        eve-ng-vg system id format        lvm2 metadata areas    1 metadata sequence no 3 vg access       read/write vg status       resizable max lv        0 cur lv        2 open lv        2 max pv        0 cur pv        1 act pv        1 vg size        39.52 gib pe size        4.00 mib total pe       10117 alloc pe / size    10117 / 39.52 gib free pe / size    0 / 0 vg uuid        evwubc-nfsg-dhqa-znxb-u3gv-v782-q8zxkiroot@eve-ng:~# vgextend eve-ng-vg /dev/sda3 volume group "eve-ng-vg" successfully extendedroot@eve-ng:~# vgdisplay --- volume group --- vg name        eve-ng-vg system id format        lvm2 metadata areas    2 metadata sequence no 4 vg access       read/write vg status       resizable max lv        0 cur lv        2 open lv        2 max pv        0 cur pv        2 act pv        2 vg size        249.52 gib pe size        4.00 mib total pe       63877 alloc pe / size    10117 / 39.52 gib free pe / size    53760 / 210.00 gib vg uuid        evwubc-nfsg-dhqa-znxb-u3gv-v782-q8zxkiroot@eve-ng:~# lvdisplay --- logical volume --- lv path        /dev/eve-ng-vg/root lv name        root vg name        eve-ng-vg lv uuid        ktupr0-vpqs-rjjv-a1fc-u6gd-u8yn-2wyq53 lv write access    read/write lv creation host, time eve-ng, 2018-03-21 02:25:21 +0200 lv status       available # open         1 lv size        38.56 gib current le       9872 segments        1 allocation       inherit read ahead sectors   auto - currently set to   256 block device      253:0//扩展逻辑卷root@eve-ng:~# lvextend -l +100%free /dev/eve-ng-vg/root size of logical volume eve-ng-vg/root changed from 38.56 gib (9872 extents) to 248.56 gib (63632 extents). logical volume root successfully resized.root@eve-ng:~# df -hfilesystem          size used avail use% mounted onudev             7.9g   0 7.9g  0% /devtmpfs             1.6g  19m 1.6g  2% /run/dev/mapper/eve--ng--vg-root  38g  13g  23g 36% /tmpfs             7.9g   0 7.9g  0% /dev/shmtmpfs             5.0m   0 5.0m  0% /run/locktmpfs             7.9g   0 7.9g  0% /sys/fs/cgroup/dev/sda1           472m  83m 365m 19% /boot//在线扩容,要先查看当前的文件系统的类型，可以通过cat /etc/fstab来查看root@eve-ng:~# resize2fs /dev/eve-ng-vg/rootresize2fs 1.42.13 (17-may-2015)filesystem at /dev/eve-ng-vg/root is mounted on /; on-line resizing requiredold_desc_blocks = 3, new_desc_blocks = 16the filesystem on /dev/eve-ng-vg/root is now 65159168 (4k) blocks long.root@eve-ng:~# df -hfilesystem          size used avail use% mounted onudev             7.9g   0 7.9g  0% /devtmpfs             1.6g  19m 1.6g  2% /run/dev/mapper/eve--ng--vg-root 245g  13g 222g  6% /tmpfs             7.9g   0 7.9g  0% /dev/shmtmpfs             5.0m   0 5.0m  0% /run/locktmpfs             7.9g   0 7.9g  0% /sys/fs/cgroup/dev/sda1           472m  83m 365m 19% /boot

到此，相信大家对"如何给centos系统扩展磁盘分区"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！