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kvm之快照管理
使用kvm快照，磁盘则必需要使用qcow2的格式
# qemu-img info centos6.test-x86_64.raw
image: centos6.test-x86_64.raw
file format: raw
virtual size: 80G (85899345920 bytes)
disk size: 1.2G
#
关闭虚拟机并改变磁盘的格式
# virsh list
Id 名称 状态
----------------------------------------------------
2 ubuntu-14.4-n1 running
14 ubuntu-14.4-113-pycharm running
16 ubuntu-14.4-n2 running
20 centos-6.8-grafana running
22 centos-6.8-data running
24 centos-6.8-test running
# virsh destroy centos-6.8-test
域 centos-6.8-test 被删除
# virsh list --all
Id 名称 状态
----------------------------------------------------
2 ubuntu-14.4-n1 running
14 ubuntu-14.4-113-pycharm running
16 ubuntu-14.4-n2 running
20 centos-6.8-grafana running
22 centos-6.8-data running
- centos-6.8-n1 关闭
- centos-6.8-test 关闭
- renjin-scripts 关闭
- ubuntu-14.4-n3 关闭
# qemu-img convert -f raw -O qcow2 centos6.test-x86_64.raw centos6.test-x86_64.qcow2
# virsh edit centos-6.8-test
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/media/67cbdcec-6419-4571-9632-c605b3e2b910/data/centos6.test-x86_64.qcow2'/>
查看管理快照的命令有哪些
# virsh --help | grep snap
iface-begin create a snapshot of current interfaces settings, which can be later committed (iface-commit) or restored (iface-rollback)
Snapshot (help keyword 'snapshot')
snapshot-create Create a snapshot from XML
snapshot-create-as Create a snapshot from a set of args
snapshot-current Get or set the current snapshot
snapshot-delete Delete a domain snapshot
snapshot-dumpxml Dump XML for a domain snapshot
snapshot-edit edit XML for a snapshot
snapshot-info snapshot information
snapshot-list List snapshots for a domain
snapshot-parent Get the name of the parent of a snapshot
snapshot-revert Revert a domain to a snapshot
创建快照
# virsh snapshot-create centos-6.8-test
# virsh snapshot-list centos-6.8-test
名称 Creation Time 状态
------------------------------------------------------------
1509359245 2017-10-30 18:27:25 +0800 shutoff
# 其中快照配置文件放到了/var/lib/libvirt/qemu/snapshot/
快照恢复
查看哪些快照需要恢复
# virsh list --all
Id 名称 状态
----------------------------------------------------
2 ubuntu-14.4-n1 running
14 ubuntu-14.4-113-pycharm running
16 ubuntu-14.4-n2 running
20 centos-6.8-grafana running
22 centos-6.8-data running
25 centos-6.8-test running
- centos-6.8-n1 关闭
- renjin-scripts 关闭
- ubuntu-14.4-n3 关闭
# virsh snapshot-list centos-6.8-test
名称 Creation Time 状态
------------------------------------------------------------
1509359245 2017-10-30 18:27:25 +0800 shutoff
# virsh destroy centos-6.8-test
域 centos-6.8-test 被删除
# virsh snapshot-revert centos-6.8-test 1509359245
# virsh snapshot-current centos-6.8-test
# virsh start centos-6.8-test
#至此，已经恢复完成
快照的删除
# virsh snapshot-list centos-6.8-test
名称 Creation Time 状态
------------------------------------------------------------
1509359245 2017-10-30 18:27:25 +0800 shutoff
# virsh snapshot-delete centos-6.8-test 1509359245
补充:在宿主机关机后，启动kvm遇以下问题:
# virsh start centos-7.2-xxxxxxxx
错误：开始域 centos-7.2-xxxxxxx失败
错误：Unable to read from monitor: Connection reset by peer
# virsh managedsave-remove centos-6.8-grafana
# virsh start centos-7.2-xxxxxxxxx
域 centos-7.2-xxxxxxxxx 已开始
