# 十：更改libvirt虚拟机镜像存储路径 在KVM中，默认VM镜像是存储在`/var/lib/libvirt/images`目录。有可能由于根卷空间有限`/var`目录下的空间也有限。在KVM虚拟化中，人们倾向于将VM镜像存储在集中仓库中以便实现不同hypervisor之间迁移虚拟机。这种情况下，需要更改默认的libvirt镜像目录或者你需要将卷或者NFS共享挂载到`/var/lib/libvirt/images`目录下。在嗯问，我们将看到如何修改默认的libvirt镜像路径来指定它。在KVM术语中，我们称之为"存储池"。 注意：这篇文档是在`non-selinux`节点执行的。所以如果激活了SELinux，你需要修改关闭SELinux以便能够正确修改存储路径。 ``` [root@UA-HA ~]# getenforce Disabled [root@UA-HA ~]# ``` * 登录到KVM hypervisor主机，并关闭所有运行的VM ``` [root@UA-HA kvmpool]# virsh shutdown UAKVM2 [root@UA-HA kvmpool]# [root@UA-HA ~]# virsh list --all Id Name State ---------------------------------------------------- - UAKVM2 shut off [root@UA-HA ~]# ``` * 检查存储池 ``` [root@UA-HA ~]# virsh pool-list Name State Autostart ------------------------------------------- default active yes [root@UA-HA ~]# ``` * 检查存储池信息 ``` [root@UA-HA ~]# virsh pool-info default Name: default UUID: 3599dd8a-edef-4c00-9ff5-6d880f1ecb8b State: running Persistent: yes Autostart: yes Capacity: 17.50 GiB Allocation: 7.67 GiB Available: 9.82 GiB [root@UA-HA ~]# ``` * 检查现有存储池路径 ``` [root@UA-HA ~]# virsh pool-dumpxml default |grep -i path path-/var/lib/libvirt/images-/path [root@UA-HA ~]# ``` * 验证哪些VM镜像存储在默认路径 ``` [root@UA-HA ~]# virsh vol-list default |grep "/var/lib/libvirt/images" UAKVM2.qcow2 /var/lib/libvirt/images/UAKVM2.qcow2 [root@UA-HA ~]# [root@UA-HA ~]# virsh vol-list default Name Path ------------------------------------------------------------------------------ UAKVM2.qcow2 /var/lib/libvirt/images/UAKVM2.qcow2 [root@UA-HA ~]# ``` * 停止存储池 ``` [root@UA-HA ~]# virsh pool-destroy default Pool default destroyed [root@UA-HA ~]# ``` * 编辑存储池配置 [KVM存储池](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/img/virtual/kvm/startup/KVM-storage-pool-Linux.jpg) * 启动存储池 ``` [root@UA-HA ~]# virsh pool-start default Pool default started [root@UA-HA ~]# ``` * 验证存储池路径 ``` [root@UA-HA ~]# virsh pool-dumpxml default |grep -i path path /kvmpool path [root@UA-HA ~]# ``` * 将VM镜像从旧路径移动到新路径 ``` [root@UA-HA ~]# mv /var/lib/libvirt/images/UAKVM2.qcow2 /kvmpool/ [root@UA-HA ~]# ``` * 编辑VM配置更新成新的存储池 ``` source file='/kvmpool/UAKVM2.qcow2' ``` * 启动KVM虚拟机 ``` [root@UA-HA kvmpool]# virsh start UAKVM2 Domain UAKVM2 started [root@UA-HA kvmpool]# ``` 如果看到以下报错 ``` ” error: Failed to start domain XXXXX error: unsupported configuration: Unable to find security driver for model selinux ” ``` 则编辑VM配置文件，去除XML文件中（在底部）的`selinux`行并尝试启动VM ``` # virsh edit UAKVM2 ................... seclabel type='dynamic' model='selinux' relabel='yes';/seclabel ----> Remove this line ``` ## 系列教程编译 本系列教程根据 [UnixArena Linux KVM](http://www.unixarena.com/category/redhat-linux/linux-kvm) 系列教程编译，共分以下文章： * [一：基于内核的虚拟机（KVM）概览](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/kernel_based_virtual_machine_kvm_overview/README.md) * [二：Redhat企业Linux安装KVM](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/redhat_enterprise_linux_kvm_installation/README.md) * [三：RHEL 7.2 配置KVM主机](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/rhel_7_2_configuring_kvm_hosts/README.md) * [四：使用命令行启动第一个KVM实例](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/launch_the_first_kvm_instance_using_cli/README.md) * [五：使用Virt-Manger(VMM)部署KVM实例](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/deploy_kvm_instance_using_virt_manger_vmm_gui/README.md) * [六：如何克隆一个KVM虚拟机并重置该虚拟机](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/how_to_clone_a_kvm_virtual_machines_and_reset_the_vm/README.md) * [七：如何在线添加/更改虚拟磁盘](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/how_to_add_resize_virtual_disk_on_fly/README.md) * [八：如何在线添加/移除虚拟机的内存](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/how_to_add_remove_memory_to_guest_on_fly/README.md) * [九：如何在线添加/移除虚拟机的vCPU](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/how_to_add_remove_vcpu_to_guest_on_fly/README.md) * [十：更改libvirt虚拟机镜像存储路径](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/change_libvirt_vm_image_store_path/README.md) * [十一：实现Linux KVM在线迁移](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/perform_live_migration_on_linux_kvm/README.md) * [十二：RHEL7 Pacemaker - 配置高可用KVM虚拟机](https://github.com/huataihuang/cloud-atlas-draft/tree/6f3204fffc11cf006abd394631e2598d98b415c3/virtual/kvm/startup/rhel_7_pacemaker_configuring_ha_kvm_guest/README.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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