CentOS7.3 ゲストOSに仮想ディスク追加とVG追加

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KVMのゲストOSに、仮想ディスクを追加してボリュームグループを作成します。

ゲストOS用に仮想ディスクを追加

ゲストOSの仮想ディスクタイプは「raw」ですので、同じタイプの仮想ディスクを作成して、ゲストOSに認識させます。
KVMホスト上での操作です。

# qemu-img create -f raw guestos_disk02.img 4096M   <= 仮想ディスクの作成

ゲストOSに作成した仮想ディスクを認識させる設定を行なうため、ゲストOSの停止をします。

# virsh shutdown guestos

対象となるゲストOSの設定変更を行ないます。
なお、<address>の部分は、起動時に自動で設定されるので、必要ありません。

# virsh edit guestos
<domain type='kvm'>
   :(省略)
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/virt/img/guestos_disk01.img'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/virt/img/guestos_disk02.img'/>
      <target dev='vdb' bus='virtio'/>
    </disk>
   :(省略)
  </devices>
</domain>

ゲストOSの起動を行ないます。

# virsh start guestos
Domain guestos started
 

ボリュームグループの作成

ゲストOSにログインして追加されたディスクに、新規のVGを作成します。

# fdisk -l
 
Disk /dev/vda: 10.7 GB, 10737422336 bytes, 20971528 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: 0x000bd7f9
 
   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     1050623      524288   83  Linux
/dev/vda2         1050624    20971519     9960448   8e  Linux LVM
 
Disk /dev/vdb: 4294 MB, 4294967296 bytes, 8388608 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
   :(省略)
# 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 0xa52dc001.
 
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): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Using default response p
Partition number (1-4, default 1): 1
First sector (2048-8388607, default 2048): 2048
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-8388607, default 8388607): 8388607
Using default value 8388607
Partition 1 of type Linux and of size 4 GiB is set
 
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): L
 
 0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris
 1  FAT12           27  Hidden NTFS Win 82  Linux swap / So c1  DRDOS/sec (FAT-
 2  XENIX root      39  Plan 9          83  Linux           c4  DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     85  Linux extended  c7  Syrinx
 5  Extended        41  PPC PReP Boot   86  NTFS volume set da  Non-FS data
 6  FAT16           42  SFS             87  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux plaintext de  Dell Utility
 8  AIX             4e  QNX4.x 2nd part 8e  Linux LVM       df  BootIt
 9  AIX bootable    4f  QNX4.x 3rd part 93  Amoeba          e1  DOS access
 a  OS/2 Boot Manag 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/O
 b  W95 FAT32       51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStor
 c  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad hi eb  BeOS fs
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD         ee  GPT
 f  W95 Ext'd (LBA) 54  OnTrackDM6      a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor
12  Compaq diagnost 5c  Priam Edisk     a9  NetBSD          f4  SpeedStor
14  Hidden FAT16 <3 61  SpeedStor       ab  Darwin boot     f2  DOS secondary
16  Hidden FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT
1e  Hidden W95 FAT1 80  Old Minix
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
 
Command (m for help): w
The partition table has been altered!
 
Calling ioctl() to re-read partition table.
Syncing disks.
# fdisk -l /dev/vdb1
 
Disk /dev/vdb1: 4293 MB, 4293918720 bytes, 8386560 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
 
# pvcreate /dev/vdb1
  Physical volume "/dev/vdb1" successfully created.
# pvdisplay /dev/vdb1
  "/dev/vdb1" is a new physical volume of "4.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/vdb1
  VG Name
  PV Size               4.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               NWZL7F-d44k-az8Q-Sinb-Xyvp-Mfxf-He7RBS
 
# vgcreate vg02 /dev/vdb1
  Volume group "vg02" successfully created
# pvdisplay /dev/vdb1
  --- Physical volume ---
  PV Name               /dev/vdb1
  VG Name               vg02
  PV Size               4.00 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              1023
  Free PE               1023
  Allocated PE          0
  PV UUID               NWZL7F-d44k-az8Q-Sinb-Xyvp-Mfxf-He7RBS

論理ボリュームの作成とフォーマット

VGが作成できたので、LVを作成してフォーマットします。

# vgdisplay vg02
  --- Volume group ---
  VG Name               vg02
  System ID
  Format                lvm2
  Metadata Areas        1
  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                1
  Act PV                1
  VG Size               4.00 GiB
  PE Size               4.00 MiB
  Total PE              1023
  Alloc PE / Size       0 / 0
  Free  PE / Size       1023 / 4.00 GiB
  VG UUID               MKSL4H-zmxA-gkQm-z8sA-z2Oo-g4R7-YKK6Hp
 
# lvcreate -n lv_dbdata -l 100%FREE vg02  <=作成したVG全てをLVにする
  Logical volume "lv_dbdata" created.
# vgdisplay vg02
  --- Volume group ---
  VG Name               vg02
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               4.00 GiB
  PE Size               4.00 MiB
  Total PE              1023
  Alloc PE / Size       1023 / 4.00 GiB
  Free  PE / Size       0 / 0
  VG UUID               MKSL4H-zmxA-gkQm-z8sA-z2Oo-g4R7-YKK6Hp
 
# lvdisplay /dev/vg02/lv_dbdata
  --- Logical volume ---
  LV Path                /dev/vg02/lv_dbdata
  LV Name                lv_dbdata
  VG Name                vg02
  LV UUID                rkPy1h-I9Zw-3B1f-cRCU-1ufy-QZER-Ly0gd8
  LV Write Access        read/write
  LV Creation host, time tka1md01, 2017-06-27 17:06:45 +0900
  LV Status              available
  # open                 0
  LV Size                4.00 GiB
  Current LE             1023
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2
 
# mkfs.xfs /dev/vg02/lv_dbdata  <= xfsでフォーマット
meta-data=/dev/vg02/lv_dbdata    isize=512    agcount=4, agsize=261888 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=1047552, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

マウントポイントと自動マウント

マウントポイントの作成とマシン起動時に自動マウントできるようにします。

# mkdir /dbdata
# mount /dev/vg02/lv_dbdata /dbdata
# df -m /dbdata
Filesystem                 1M-blocks  Used Available Use% Mounted on
/dev/mapper/vg02-lv_dbdata      4082    33      4050   1% /dbdata
# umount /dbdata
# vim /etc/fstab
   :(省略)
/dev/mapper/vg02-lv_dbdata    /dbdata    xfs   defaults      0 0