04. Run the kvm command line in ubuntu to install 64-bit ubuntu. & quot; Couldn & #39; t find hvm kernel for Ubuntu tree. & quot;, kvmhvm

04. Run the kvm command line in ubuntu to install 64-bit ubuntu and report "Couldn't find hvm kernel for Ubuntu tree.", kvmhvm

1. The configuration of virt-install used for ubuntu installation:

virt-install \
--name test4 \
--ram 1024 \
--disk path=/data/01_ubuntu/ubuntu4.img,size=6 \
--vcpus 1 \
--hvm \
--os-type linux \
--network network=default \
--os-variant ubuntuquantal \
--graphics none \
--console pty,target_type=serial \
--location /data/00_osfile/ubuntu-16.04.1-server-amd64.iso \
--extra-args 'console=ttyS0,115200n8 serial'

The following error is reported:

ERROR Couldn't find hvm kernel for Ubuntu tree.Domain installation does not appear to have been successful.

By checking the information, we found that virt-install can enable the debug mode and add the -- debug option.

 

2. The result of the debug mode of virt-install is as follows:

[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (urlfetcher:268) local hasFile: Couldn't find /var/lib/libvirt/boot/virtinstmnt.xPL9y1/current/images/MANIFEST
[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (urlfetcher:89) Fetching URI: /var/lib/libvirt/boot/virtinstmnt.xPL9y1/install/netboot/version.info
Retrieving file version.info...                                                                                                                      |   58 B  00:00:00     
[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (urlfetcher:1164) Didn't find any known codename in the URL string
[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (urlfetcher:511) Detected distro name=Ubuntu osvariant=linux
[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (urlfetcher:268) local hasFile: Couldn't find /var/lib/libvirt/boot/virtinstmnt.xPL9y1/install/netboot/ubuntu-installer/i386/linux

Here we can see that the problem is clearly a 64-bit operating system, why find the path of./install/netboot/ubuntu-install/i386/linux?

Let's take a look at the correct path in the iso file:

[root@11.102 01_ubuntu]$mount /data/00_osfile/ubuntu-16.04.1-server-amd64.iso /mntmount: /dev/loop2 is write-protected, mounting read-only
[root@11.102 01_ubuntu]$ls /mnt/install/netboot/ubuntu-installer/amd64/linux /mnt/install/netboot/ubuntu-installer/amd64/linux

Basically, if you change i386 in the path to amd64, virt-install installation will be fine.

Remaining logs in debug mode:

[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (urlfetcher:320) Cleaning up mount at /var/lib/libvirt/boot/virtinstmnt.xPL9y1
[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (cli:305)   File "/usr/share/virt-manager/virt-install", line 1077, in <module>
    sys.exit(main())
  File "/usr/share/virt-manager/virt-install", line 1071, in main
    start_install(guest, continue_inst, options)
  File "/usr/share/virt-manager/virt-install", line 775, in start_install
    fail(e, do_exit=False)
  File "/usr/share/virt-manager/virtinst/cli.py", line 305, in fail
    logging.debug("".join(traceback.format_stack()))

[Wed, 30 Nov 2016 11:16:07 virt-install 26900] ERROR (cli:306) Couldn't find hvm kernel for Ubuntu tree.
[Wed, 30 Nov 2016 11:16:07 virt-install 26900] DEBUG (cli:308) 
Traceback (most recent call last):
  File "/usr/share/virt-manager/virt-install", line 747, in start_install
    dom = guest.start_install(meter=meter, noboot=options.noreboot)
  File "/usr/share/virt-manager/virtinst/guest.py", line 491, in start_install
    self._prepare_install(meter, dry)
  File "/usr/share/virt-manager/virtinst/guest.py", line 304, in _prepare_install
    self.installer.prepare(self, meter)
  File "/usr/share/virt-manager/virtinst/installer.py", line 200, in prepare
    self._prepare(guest, meter)
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 451, in _prepare
    self._prepare_kernel_url(guest, fetcher)
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 360, in _prepare_kernel_url
    kernel, initrd, args = store.acquireKernel(guest)
  File "/usr/share/virt-manager/virtinst/urlfetcher.py", line 603, in acquireKernel
    {"distro": self.name, "type" : self.type})
RuntimeError: Couldn't find hvm kernel for Ubuntu tree.

	 

 

3. Modify virt-manager Code:

Through the above error, we found that virt-manager was written in python! I just want to see what source code comes from. This is exactly the case!

Debug the virt-manager project step by step to find the problem:

[root@11.102 ~]$grep -n -A22 "class DebianDistro" /usr/share/virt-manager/virtinst/urlfetcher.py
1076:class DebianDistro(Distro):
1077-    # ex. http://ftp.egr.msu.edu/debian/dists/sarge/main/installer-i386/
1078-    # daily builds: http://d-i.debian.org/daily-images/amd64/
1079-    name = "Debian"
1080-    urldistro = "debian"
1081-    os_variant = "linux"
1082-
1083-    def __init__(self, *args, **kwargs):
1084-        Distro.__init__(self, *args, **kwargs)
1085-
1086-        # Pull the tree's arch out of the URL text
1087-        self._treeArch = 'i386'
1088-        for pattern in ["^.*/installer-(\w+)/?$",
1089-                        "^.*/daily-images/(\w+)/?$"]:
1090-            arch = re.findall(pattern, self.uri)
1091-            if arch:
1092-                self._treeArch = arch[0]
1093-                break
1094-
1095-        self._url_prefix = 'current/images'
1096-        self._installer_dirname = self.name.lower() + "-installer"
1097-        self._set_media_paths()

We found the Debian-based system in the __init _ method self. _ treeArch is i386 during initialization. It is estimated that virt-manager is reading the ubuntu iso file. What is the problem? The system is x86_64 and the value is changed to amd64, you can.

Run virt-install again. The ubuntu installation page is displayed!

 

Appendix: Solution for installing 64-bit ubuntu with KVM through CentOS command line "Couldn't find hvm kernel for Ubuntu tree ."

Grep-n-A21 'class Debian distro'/usr/lib/python2.6/site-packages/systinst/OSDistro. py command to view the _ init _ method of the Debian class

[root@2 virtinst]$grep -n -A21 'class DebianDistro' /usr/lib/python2.6/site-packages/virtinst/OSDistro.py
892:class DebianDistro(Distro):
893-    # ex. http://ftp.egr.msu.edu/debian/dists/sarge/main/installer-i386/
894-    # daily builds: http://people.debian.org/~joeyh/d-i/
895-
896-    name = "Debian"
897-    os_type = "linux"
898-
899-    def __init__(self, uri, arch, vmtype=None, scratchdir=None):
900-        Distro.__init__(self, uri, arch, vmtype, scratchdir)
901-        if uri.count("installer-i386"):
902-            self._treeArch = "i386"
903-        elif uri.count("installer-amd64"):
904-            self._treeArch = "amd64"
905-        else:
906-            self._treeArch = "i386"
907-
908-        if re.match(r'i[4-9]86', arch):
909-            self.arch = 'i386'
910-
911-        self._installer_name = self.name.lower() + "-" + "installer"
912-        self._prefix = 'current/images'
913-        self._set_media_paths()

Change the else in the _ init _ method: Change "i386" to "amd64" in the row below the condition.

- self._treeArch = 'i386'+ self._treeArch = 'amd64'