Commit bbe3dcb8 authored by Nikos Skalkotos's avatar Nikos Skalkotos

docs: Add a troubleshooting section

Populate this section with instructions on how to troubleshoot
libguestfs's launch failures.
parent 74735e36
......@@ -412,8 +412,80 @@ the one with the most available space. The user may overwrite this behavior and
indicate a different directory using the *tmpdir* option. This option is
supported by both *snf-image-creator* and *snf-mkimage*.
Troubleshooting
===============
Failures in launching libguestfs's helper VM
--------------------------------------------
The most common error you may get when using *snf-image-creator* is a failure
when launching *libguestfs*'s helper VM. *libguestfs* [#f4]_ is a library
for manipulating disk images and *snf-image-creator* makes heavy use of it.
Most of the time those errors have to do with the installation of this
library and not with *snf-image-creator* itself.
The first thing you should do when troubleshooting this is to run the
``liguestfs-test-tool`` diagnostic tool. This tool gets shipped with the
library to test if *libguestfs* works as expected. If it runs to completion
successfully, you will see this near the end:
.. code-block:: console
===== TEST FINISHED OK =====
and the test tool will exit with code 0.
If you get errors like this:
.. code-block:: console
libguestfs: launch: backend=libvirt
libguestfs: launch: tmpdir=/tmp/libguestfseKwXgq
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: libvirt version = 1001001 (1.1.1)
libguestfs: [00012ms] connect to libvirt
libguestfs: opening libvirt handle: URI = NULL, auth = virConnectAuthPtrDefault, flags = 0
libvirt: XML-RPC error : Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
libguestfs: error: could not connect to libvirt (URI = NULL): Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory [code=38 domain=7]
libguestfs-test-tool: failed to launch appliance
libguestfs: closing guestfs handle 0x7ff0d44f8bb0 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfseKwXgq
it means that *libguestfs* is configured to use *libvirt* backend by default
but the libvirt deamon is not running. You can either start libvirt deamon
(providing instructions on how to do this is out of the scope of this
tutorial) or change the default backend to *direct* by defining the
**LIBGUESTFS_BACKEND** variable like this:
.. code-block:: console
# export LIBGUESTFS_BACKEND=direct
If you run the ``libguestfs-test-tool``, the command should finish without
errors. Do the same every time before running *snf-image-creator*.
If you get errors on *febootstrap-supermin-helper* like this one:
.. code-block:: console
febootstrap-supermin-helper: ext2: parent directory not found: /lib:
File not found by ext2_lookup
libguestfs: error: external command failed, see earlier error messages
libguestfs-test-tool: failed to launch appliance
libguestfs: closing guestfs handle 0x7b3160 (state 0)
you probably need to update the supermin appliance (just once). On Debian
and Ubuntu systems you can do it using the command below:
.. code-block:: console
# update-guestfs-appliance
.. rubric:: Footnotes
.. [#f1] http://technet.microsoft.com/en-us/library/bb676673.aspx
.. [#f2] http://sourceware.org/lvm2/
.. [#f3] http://mirrors.slackware.com/slackware/slackware-14.0/README.initrd
.. [#f4] http://libguestfs.org/
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