KVM Virtual Machine Hostname 変更方法

方法

1. virsh edit 使わない場合
2. virsh edit 使う場合

初期状態

# virsh list
 Id    Name                           State
----------------------------------------------------
 12    vm01                           running

実際のファイル

• XML : /etc/libvirt/qemu/vm01.xml
• IMAGE : /var/lib/libvirt/images/vm01.qcow2

Shutdown Domain

# virsh shutdown vm01
Domain vm01 is being shutdown

shutdown 出来なかったら、destroy で強制停止

# virsh destroy vm01
Domain vm01 destroyed

# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm01                           shut off

1. virsh edit 使わない場合

1.1. XML 取得

# virsh dumpxml vm01 > vm01.xml

1.2. XML 修正

# cp vm01.xml vm01.xml.org
# vi vm01.xml
# diff vm01.xml.org vm01.xml
2c2
<   <name>vm01</name>
---
>   <name>vm02</name>

1.3. 停止状態の古い Domain を削除

# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm01                           shut off

# virsh undefine vm01
Domain vm01 has been undefined

# virsh list --all
 Id    Name                           State
----------------------------------------------------

1.4. XML ファイルからリネームした Domain を登録

# virsh define ./vm01.xml
Domain vm02 defined from ./vm01.xml

# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm02                           shut off

1.5. Domain 起動

# virsh start vm02
Domain vm02 started

# virsh list
 Id    Name                           State
----------------------------------------------------
 14    vm02                           running

2. virsh edit 使う場合

2.0. virsh edit で name だけ変更しても、 uuid が同じなので変更出来ない

# virsh edit vm01
error: operation failed: domain 'vm01' is already defined with uuid 23bcf945-288d-460a-9953-4797022d45c4
Failed. Try again? [y,n,f,?]:

2.1. 現在の UUID 確認、新しい UUID 取得

現在の UUID 確認

# virsh dominfo vm01 | grep UUID
UUID:           23bcf945-288d-460a-9953-4797022d45c4

新しい UUID 取得

# uuidgen
466df1ab-c0af-41a4-86d0-04a657042593

2.2. あとで Diff る為に XML 取得

# virsh dumpxml vm01 > vm01.xml

2.3. virsh edit

name と uuid を修正

# virsh edit vm01
Domain vm02 XML configuration edited.

新しい Domain (vm02) が作成される

# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm01                           shut off
 -     vm02                           shut off

2.4. Diff

• vm01: 変更前
• vm02: 変更後

# virsh dumpxml vm02 > vm02.xml

# diff vm01.xml vm02.xml
2,3c2,3
<   <name>vm01</name>
<   <uuid>23bcf945-288d-460a-9953-4797022d45c4</uuid>
---
>   <name>vm02</name>
>   <uuid>466df1ab-c0af-41a4-86d0-04a657042593</uuid>

2.5. 停止状態の古い Domain を削除

# virsh undefine vm01
Domain vm01 has been undefined

# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     vm02                           shut off

2.6. Domain 起動

# virsh start vm02
Domain vm02 started

# virsh list --all
 Id    Name                           State
----------------------------------------------------
 15    vm02                           running

Environment

# virsh --version
1.2.8

# libvirtd --version
libvirtd (libvirt) 1.2.8