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Centos7创建LVM磁盘管理

转载请注明出处,谢谢。

环境介绍

在centos7下需要挂载两个新的磁盘。为了方便后续的扩容方便,决定将这其设置为LVM管理的方式。

查看一下当前有哪些新增的数据盘,如下:

[root@runsdata-test-0004 ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  1.4G   36G   4% /
devtmpfs        7.8G     0  7.8G   0% /dev
tmpfs           7.8G     0  7.8G   0% /dev/shm
tmpfs           7.8G  328K  7.8G   1% /run
tmpfs           7.8G     0  7.8G   0% /sys/fs/cgroup
tmpfs           1.6G     0  1.6G   0% /run/user/0
[root@runsdata-test-0004 ~]# fdisk -l

Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0008d73a

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048    83884031    41940992   83  Linux

Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

[root@runsdata-test-0004 ~]#
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可以从上面看出,目前有三块硬盘。 系统盘:40G 另外还有两块50G的硬盘,需要挂载。我以其中一块硬盘作为示例。

LVM管理基本概念

LVM管理概念图

  • 1、 物理卷-----PV(Physical Volume) 物理卷在逻辑卷管理中处于最底层,它可以是实际物理硬盘上的分区,也可以是整个 物理硬盘。
  • 2、 卷组--------VG(Volumne Group) 卷组建立在物理卷之上,一个卷组中至少要包括一个物理卷,在卷组建立之后可 动态添加物理卷到卷组中。一个逻辑卷管理系统工程中可以只有一个卷组,也可以 拥有多个卷组。
  • 3、 逻辑卷-----LV(Logical Volume) 逻辑卷建立在卷组之上,卷组中的未分配空间可以用于建立新的逻辑卷,逻辑卷建立 后可以动态地扩展和缩小空间。系统中的多个逻辑卷要以属于同一个卷组,也可以 属于不同的多个卷组。
  • 4、 物理区域--PE(Physical Extent) 物理区域是物理卷中可用于分配的最小存储单元,物理区域的大小可根据实际情况在 建立物理卷时指定。物理区域大小一旦确定将不能更改,同一卷组中的所有物理卷 的物理区域大小需要一致。
  • 5、 逻辑区域—LE(Logical Extent) 逻辑区域是逻辑卷中可用于分配的最小存储单元,逻辑区域的大小取决于逻辑卷所在 卷组中的物理区域的大小。
  • 6、 卷组描述区域-----(Volume Group Descriptor Area) 卷组描述区域存在于每个物理卷中,用于描述物理卷本身、物理卷所属卷组、卷组中的 逻辑卷及逻辑卷中物理区域的分配等所有信息,卷组描述区域是在使用pvcreate 建立物理卷时建立的。

目标 - LVM管理拓扑

本篇章以此拓扑进行逐步部署。

给硬盘分区

选择其中一块50G的数据盘进行分区,只要将50G都设置一个分区即可,无需考虑设置多个分区。 配置步骤如下:

使用命令:fdisk -l |grep dev,查看添加的硬盘是否存在。

[root@runsdata-test-0004 ~]# fdisk -l | grep dev
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
/dev/vda1   *        2048    83884031    41940992   83  Linux
Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
[root@runsdata-test-0004 ~]# 
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fdisk是分区工具:fdisk /dev/vdb,进入分区工具设置。

[root@runsdata-test-0004 ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x051e2cc7.

Command (m for help): m     
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   g   create a new empty GPT partition table
   G   create an IRIX (SGI) partition table
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): 
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输入m命令,则是查看有哪些命令可以使用。其中可以先看看这个数据盘有什么分区了。

输入p命令,查看该数据盘已经有哪些分区

Command (m for help): p

Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x051e2cc7

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): 
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可以看出这块数据盘暂时还没有任何分区,那么下面我先来进行分区。

下面进入分区,‘n’选一个分区类型,如没有其他设置可按默认下到返回m for help处。最后按'w'保存设置。

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-104857599, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599): 
Using default value 104857599
Partition 1 of type Linux and of size 50 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@runsdata-test-0004 ~]# 
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此时,再次查看一下数据盘,应该已经有一个50G的分区了。那么下一步,将其改为Linux LVM格式分区。

设置磁盘分区为Linux LVM格式分区

Command (m for help): p

Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x051e2cc7

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048   104857599    52427776   83  Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x051e2cc7

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048   104857599    52427776   8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@runsdata-test-0004 ~]# 
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根据上面的步骤,再对另一个数据盘进行分区,执行如下:

分区:

[root@runsdata-test-0004 ~]# fdisk -l | grep dev
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
/dev/vda1   *        2048    83884031    41940992   83  Linux
Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
/dev/vdb1            2048   104857599    52427776   8e  Linux LVM
Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# fdisk /dev/vdc
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x420d8007.

Command (m for help): p

Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x420d8007

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-104857599, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599): 
Using default value 104857599
Partition 1 of type Linux and of size 50 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@runsdata-test-0004 ~]# 
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设置为LVM

[root@runsdata-test-0004 ~]# fdisk /dev/vdc
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x420d8007

   Device Boot      Start         End      Blocks   Id  System
/dev/vdc1            2048   104857599    52427776   83  Linux

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x420d8007

   Device Boot      Start         End      Blocks   Id  System
/dev/vdc1            2048   104857599    52427776   8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@runsdata-test-0004 ~]# 
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创建物理卷 PV

安装pv系列命令, yum install lvm2 -y

阿里云的服务器默认没有安装pv的相关命令的。

[root@runsdata-test-0004 ~]# pvcreate
-bash: pvcreate: command not found
[root@runsdata-test-0004 ~]# 
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需要安装一下lvm2的工具如下:

[root@server81 ~]# rpm -qa | grep lvm
lvm2-2.02.171-8.el7.x86_64
lvm2-libs-2.02.171-8.el7.x86_64
[root@server81 ~]# 
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安装如下:

[root@runsdata-test-0004 ~]# yum install lvm2 -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package lvm2.x86_64 7:2.02.180-10.el7_6.2 will be installed
.... 省略 ....

Installed:
  lvm2.x86_64 7:2.02.180-10.el7_6.2                                                                   

Dependency Installed:
  device-mapper-event.x86_64 7:1.02.149-10.el7_6.2                                                    
  device-mapper-event-libs.x86_64 7:1.02.149-10.el7_6.2                                               
  device-mapper-persistent-data.x86_64 0:0.7.3-3.el7                                                  
  libaio.x86_64 0:0.3.109-13.el7                                                                      
  lvm2-libs.x86_64 7:2.02.180-10.el7_6.2                                                              

Dependency Updated:
  device-mapper.x86_64 7:1.02.149-10.el7_6.2      device-mapper-libs.x86_64 7:1.02.149-10.el7_6.2     

Complete!
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# rpm -qa | grep lvm
lvm2-libs-2.02.180-10.el7_6.2.x86_64
lvm2-2.02.180-10.el7_6.2.x86_64
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# pv
pv         pvck       pvdisplay  pvremove   pvs        
pvchange   pvcreate   pvmove     pvresize   pvscan     
[root@runsdata-test-0004 ~]# pv
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从上面可以看出已经安装好了lvm所需要的工具了。那么下面来继续配置。

创建物理卷:选择自己要创建的分区

[root@runsdata-test-0004 ~]# fdisk -l | grep dev
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
/dev/vda1   *        2048    83884031    41940992   83  Linux
Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
/dev/vdb1            2048   104857599    52427776   8e  Linux LVM
Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# pvcreate /dev/vdb
vdb   vdb1  
[root@runsdata-test-0004 ~]# pvcreate /dev/vdb1 
  Physical volume "/dev/vdb1" successfully created.
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# 
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查看创建好的物理卷

[root@runsdata-test-0004 ~]# pvs
  PV         VG Fmt  Attr PSize   PFree  
  /dev/vdb1     lvm2 ---  <50.00g <50.00g
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# pvdisplay 
  "/dev/vdb1" is a new physical volume of "<50.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/vdb1
  VG Name               
  PV Size               <50.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               oMzorH-1mfB-0VEy-eZDB-HHU3-UM9C-0EoPTU
   
[root@runsdata-test-0004 ~]# 
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  • PE(physical extent):物理区域是物理卷中可用于分配的最小存储单元,物理区域大小在建立卷组时指定,一旦确定不能更改,同一卷组所有物理卷的物理区域大小需一致,新的pv加入到vg后,pe的大小自动更改为vg中定义的pe大小。

  • LE(logical extent):逻辑区域是逻辑卷中可用于分配的最小存储单元,逻辑区域的大小取决于逻辑卷所在卷组中的物理区域的大小。

  • 卷组描述区域:卷组描述区域存在于每个物理卷中,用于描述物理卷本身、物理卷所属卷组、卷组中逻辑卷、逻辑卷中物理区域的分配等所有信息,它是在使用pvcreate建立物理卷时建立的。

根据上面的步骤,再给另一个数据盘创建PV

[root@runsdata-test-0004 ~]# fdisk -l | grep dev
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
/dev/vda1   *        2048    83884031    41940992   83  Linux
Disk /dev/vdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
/dev/vdb1            2048   104857599    52427776   8e  Linux LVM
Disk /dev/vdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
/dev/vdc1            2048   104857599    52427776   8e  Linux LVM
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# pvcreate /dev/vdc1 
  Physical volume "/dev/vdc1" successfully created.
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# pvs
  PV         VG       Fmt  Attr PSize   PFree  
  /dev/vdb1  vgdocker lvm2 a--  <50.00g <50.00g
  /dev/vdc1           lvm2 ---  <50.00g <50.00g
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/vdb1
  VG Name               vgdocker
  PV Size               <50.00 GiB / not usable 3.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              12799
  Free PE               12799
  Allocated PE          0
  PV UUID               oMzorH-1mfB-0VEy-eZDB-HHU3-UM9C-0EoPTU
   
  "/dev/vdc1" is a new physical volume of "<50.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/vdc1
  VG Name               
  PV Size               <50.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               nzkwWq-h4KK-2g64-aAqT-3Ugz-qvrj-bq4GR3
   
[root@runsdata-test-0004 ~]# 
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创建卷组,用于管理PV以及LV

vg系列命令

[root@runsdata-test-0004 ~]# vg
vgcfgbackup    vgconvert      vgextend       vgmknodes      vgs            
vgcfgrestore   vgcreate       vgimport       vgreduce       vgscan         
vgchange       vgdisplay      vgimportclone  vgremove       vgsplit        
vgck           vgexport       vgmerge        vgrename       
[root@runsdata-test-0004 ~]# vg
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创建卷组VG,名字可以随意起

这个卷组我是专门给docker以及data存储数据使用的,那么就命名为vgdata。 下面就创建一个vgdata的卷组,然后使用vgs以及vgdisplay查看一下创建后的信息。

[root@runsdata-test-0004 ~]# vgcreate vgdocker /dev/vdb1  ## 测试创建一下
  Volume group "vgdocker" successfully created
[root@runsdata-test-0004 ~]# 
[root@runsdata-test-0004 ~]# vgremove vgdocker   ## 删除之前创建的
  Volume group "vgdocker" successfully removed

## 将前面的两个PV创建到vgdata的逻辑组中。
[root@runsdata-test-0004 ~]# vgcreate vgdata /dev/vdc1 /dev/vdb1  
  Volume group "vgdata" successfully created
[root@runsdata-test-0004 ~]# 

## 查看vg的信息
[root@runsdata-test-0004 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree 
  vgdata   2   0   0 wz--n- 99.99g 99.99g
[root@runsdata-test-0004 ~]# 

## 查看vg的详细信息
[root@runsdata-test-0004 ~]# vgdisplay 
  --- Volume group ---
  VG Name               vgdata
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               99.99 GiB
  PE Size               4.00 MiB
  Total PE              25598
  Alloc PE / Size       0 / 0   
  Free  PE / Size       25598 / 99.99 GiB
  VG UUID               52PHwY-0a16-1yPo-EYNE-YUv0-4LJx-CWZsZS
   
[root@runsdata-test-0004 ~]# 
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创建好了卷组之后,下面就要创建逻辑卷了。

创建逻辑卷LV

首先查看一下lvcreate的相关命令参数

[root@runsdata-test-0004 ~]#  lvcreate --help
  lvcreate - Create a logical volume
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现在我打算给docker使用的逻辑卷使用50G左右,data目录使用逻辑卷50G左右。那么就需要创建两个50G大小的逻辑卷。

## 创建大小50G名称docker的lv ,-L 指定大小,-n指定名称
[root@runsdata-test-0004 ~]# lvcreate -L 50G -n docker vgdata
  Logical volume "docker" created.
[root@runsdata-test-0004 ~]# 
## 再创建一个50G的data逻辑卷报错,提示空间不足了,因为逻辑组只有 < 99G 的大小
[root@runsdata-test-0004 ~]# lvcreate -L 50G -n data vgdata
  Volume group "vgdata" has insufficient free space (12798 extents): 12800 required.
[root@runsdata-test-0004 ~]# 
## 那么就创建一个49G的data逻辑卷LV
[root@runsdata-test-0004 ~]# lvcreate -L 49G -n data vgdata
  Logical volume "data" created.
[root@runsdata-test-0004 ~]# 
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查看逻辑卷LV的信息

[root@runsdata-test-0004 ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/vgdata/docker
  LV Name                docker
  VG Name                vgdata
  LV UUID                XWcgud-iAYP-j2Mo-x8kq-SjQ2-edP2-Usa4RZ
  LV Write Access        read/write
  LV Creation host, time runsdata-test-0004, 2018-12-10 13:57:01 +0800
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             12800
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           252:0
   
  --- Logical volume ---
  LV Path                /dev/vgdata/data
  LV Name                data
  VG Name                vgdata
  LV UUID                HVfQpR-Zs81-RFiZ-rAFC-lBMk-bMhe-MTB1zl
  LV Write Access        read/write
  LV Creation host, time runsdata-test-0004, 2018-12-10 13:58:36 +0800
  LV Status              available
  # open                 0
  LV Size                49.00 GiB
  Current LE             12544
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           252:1
   
[root@runsdata-test-0004 ~]# 
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那么这时候已经有docker、data两个逻辑卷了,下面就是进行格式化,目录的挂载了。

逻辑卷格式化

  • 执行lvdisplay查看逻辑卷信息,获取逻辑卷LV的Path
  • 对逻辑卷进行格式化mkfs.ext4 /dev/vgdata/docker

## 查看lv的详细信息
[root@runsdata-test-0004 ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/vgdata/docker
  LV Name                docker
  VG Name                vgdata
  LV UUID                XWcgud-iAYP-j2Mo-x8kq-SjQ2-edP2-Usa4RZ
  LV Write Access        read/write
  LV Creation host, time runsdata-test-0004, 2018-12-10 13:57:01 +0800
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             12800
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           252:0
   
  --- Logical volume ---
  LV Path                /dev/vgdata/data
  LV Name                data
  VG Name                vgdata
  LV UUID                HVfQpR-Zs81-RFiZ-rAFC-lBMk-bMhe-MTB1zl
  LV Write Access        read/write
  LV Creation host, time runsdata-test-0004, 2018-12-10 13:58:36 +0800
  LV Status              available
  # open                 0
  LV Size                49.00 GiB
  Current LE             12544
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           252:1
   
## 对逻辑卷进行ext4格式化
[root@runsdata-test-0004 ~]# mkfs.ext4 /dev/vgdata/docker 
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
3276800 inodes, 13107200 blocks
655360 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2162163712
400 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done   

## 对逻辑卷进行ext4格式化
[root@runsdata-test-0004 ~]# mkfs.ext4 /dev/vgdata/data 
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
3211264 inodes, 12845056 blocks
642252 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2162163712
392 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done   

[root@runsdata-test-0004 ~]# 
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挂载文件目录

[root@runsdata-test-0004 ~]# cd /
[root@runsdata-test-0004 /]# ls
bin   dev  home  lib64       media  opt   root  sbin  sys  usr
boot  etc  lib   lost+found  mnt    proc  run   srv   tmp  var
[root@runsdata-test-0004 /]# mkdir docker
[root@runsdata-test-0004 /]# 
[root@runsdata-test-0004 /]# mount /dev/vgdata/docker docker
[root@runsdata-test-0004 /]# 
[root@runsdata-test-0004 /]# mkdir data
[root@runsdata-test-0004 /]# 
[root@runsdata-test-0004 /]# mount /dev/vgdata/data data
[root@runsdata-test-0004 /]# 
[root@runsdata-test-0004 /]# df -h
Filesystem                 Size  Used Avail Use% Mounted on
/dev/vda1                   40G  1.5G   36G   4% /
devtmpfs                   7.8G     0  7.8G   0% /dev
tmpfs                      7.8G     0  7.8G   0% /dev/shm
tmpfs                      7.8G  352K  7.8G   1% /run
tmpfs                      7.8G     0  7.8G   0% /sys/fs/cgroup
tmpfs                      1.6G     0  1.6G   0% /run/user/0
/dev/mapper/vgdata-docker   50G   53M   47G   1% /docker
/dev/mapper/vgdata-data     49G   53M   46G   1% /data
[root@runsdata-test-0004 /]# 
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可以看到 /docker 和 /data 目录已经使用上了。

测试写入文件看看。

[root@runsdata-test-0004 /]# cd /docker/
[root@runsdata-test-0004 docker]# pwd
/docker
[root@runsdata-test-0004 docker]# ls
lost+found
[root@runsdata-test-0004 docker]# 
[root@runsdata-test-0004 docker]# echo 123 > 1.txt
[root@runsdata-test-0004 docker]# ls
1.txt  lost+found
[root@runsdata-test-0004 docker]# cat 1.txt 
123
[root@runsdata-test-0004 docker]# 
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好了,写到这里基本上已经可以了,但是如果服务器重启的话,是无法自动挂载上/docker和/data目录的。

下面来设置一下磁盘开机的自动挂载。

设置磁盘开机自动挂载,配置/etc/fstab文件

需要让系统开机自动挂载,需要将挂载信息写入到/etc/fstab文件中。

[root@runsdata-test-0004 docker]# vim /etc/fstab 


#
# /etc/fstab
# Created by anaconda on Sun Oct 15 15:19:00 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=eb448ab..省略...6a31 /                       ext4    defaults        1 1
/dev/mapper/vgdata-docker /docker ext4    defaults        1 1
/dev/mapper/vgdata-data   /data   ext4    defaults        1 1
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然后进行重启reboot测试一下。

reboot测试

LVM管理的好处就是灵活得扩容、管理磁盘,后续可以再写一个扩容磁盘的篇章。

参考文献

CentOS 7.2 添加磁盘并创建新区

CentOS7下LVM的简单创建

LVM基础详细说明及动态扩容lvm逻辑卷的操作记录