[Libguestfs] virt-resize changing cachedir

[Richard W.M. Jones]

On Tue, Jan 23, 2018 at 06:01:08AM +0000, Ryan Lindsay wrote:
> Hi Richard
> 
> I have been playing around with your lovely libguestfs tools . I have however run into a bit of a problem
> 
> Basically I have a 5.4T qcow2 virtual disk, which I made too small (bugger)
> 
> So I had read that you can expand these with your virt-resize tools.
> 
> So I tried this sort of thing
> 
> virt-resize --expand /dev/sda1 virtual.qcow2 outdisk.qcow2
> 
> however it gives me the rather intersting Fatal error: exception Guestfs.Error("febootstrap-supermin-helper exited with error status 1, see debug messages above")
> 
> Which I took to be non-optimal
> 
> I believe however this could mean that my cachedir is to piddling in size
> 
> 
> [root at space space]# virt-resize --expand /dev/sda1 virtual.qcow2 outdisk.qcow2
> Examining virtual.qcow2 ...
> libguestfs: trace: set_verbose true
> libguestfs: trace: set_verbose = 0
> libguestfs: create: flags = 0, handle = 0x1f827f0
> libguestfs: trace: add_drive "virtual.qcow2" "readonly:true"
> libguestfs: trace: add_drive = 0
> libguestfs: trace: add_drive "outdisk.qcow2" "readonly:false"
> libguestfs: trace: add_drive = 0
> libguestfs: trace: launch
> libguestfs: trace: get_tmpdir
> libguestfs: trace: get_tmpdir = "/tmp"
> libguestfs: launch: attach-method=appliance
> libguestfs: launch: tmpdir=/tmp/libguestfsteWT6W
> libguestfs: launch: umask=0022
> libguestfs: launch: euid=0
> libguestfs: command: run: febootstrap-supermin-helper
> libguestfs: command: run: \ --verbose
> libguestfs: command: run: \ -f checksum
> libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
> libguestfs: command: run: \ x86_64
> supermin helper [00000ms] whitelist = (not specified), host_cpu = x86_64, kernel = (null), initrd = (null), appliance = (null)
> supermin helper [00000ms] inputs[0] = /usr/lib64/guestfs/supermin.d
> checking modpath /lib/modules/2.6.32-696.13.2.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-696.13.2.el6.x86_64 because modpath /lib/modules/2.6.32-696.13.2.el6.x86_64 exists
> checking modpath /lib/modules/2.6.32-696.16.1.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-696.16.1.el6.x86_64 because modpath /lib/modules/2.6.32-696.16.1.el6.x86_64 exists
> checking modpath /lib/modules/2.6.32-431.11.2.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-431.11.2.el6.x86_64 because modpath /lib/modules/2.6.32-431.11.2.el6.x86_64 exists
> checking modpath /lib/modules/2.6.32-504.3.3.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-504.3.3.el6.x86_64 because modpath /lib/modules/2.6.32-504.3.3.el6.x86_64 exists
> supermin helper [00000ms] finished creating kernel
> supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d
> supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/base.img
> supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/daemon.img
> supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/hostfiles
> supermin helper [00022ms] visiting /usr/lib64/guestfs/supermin.d/init.img
> supermin helper [00022ms] visiting /usr/lib64/guestfs/supermin.d/udev-rules.img
> supermin helper [00022ms] adding kernel modules
> supermin helper [00055ms] finished creating appliance
> libguestfs: checksum of existing appliance: 9157ab378e1f61ccd23c368c72b4b1dd1131a5cbb309216a14de65c614223f62
> libguestfs: trace: get_cachedir
> libguestfs: trace: get_cachedir = "/var/tmp"
> libguestfs: trace: get_cachedir
> libguestfs: trace: get_cachedir = "/var/tmp"
> libguestfs: [00057ms] begin building supermin appliance
> libguestfs: [00057ms] run supermin-helper
> libguestfs: command: run: febootstrap-supermin-helper
> libguestfs: command: run: \ --verbose
> libguestfs: command: run: \ --copy-kernel
> libguestfs: command: run: \ -f ext2
> libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
> libguestfs: command: run: \ x86_64
> libguestfs: command: run: \ /var/tmp/guestfs.S833dI/kernel
> libguestfs: command: run: \ /var/tmp/guestfs.S833dI/initrd
> libguestfs: command: run: \ /var/tmp/guestfs.S833dI/root
> supermin helper [00000ms] whitelist = (not specified), host_cpu = x86_64, kernel = /var/tmp/guestfs.S833dI/kernel, initrd = /var/tmp/guestfs.S833dI/initrd, appliance = /var/tmp/guestfs.S833dI/root
> supermin helper [00000ms] inputs[0] = /usr/lib64/guestfs/supermin.d
> checking modpath /lib/modules/2.6.32-696.13.2.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-696.13.2.el6.x86_64 because modpath /lib/modules/2.6.32-696.13.2.el6.x86_64 exists
> checking modpath /lib/modules/2.6.32-696.16.1.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-696.16.1.el6.x86_64 because modpath /lib/modules/2.6.32-696.16.1.el6.x86_64 exists
> checking modpath /lib/modules/2.6.32-431.11.2.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-431.11.2.el6.x86_64 because modpath /lib/modules/2.6.32-431.11.2.el6.x86_64 exists
> checking modpath /lib/modules/2.6.32-504.3.3.el6.x86_64 is a directory
> picked vmlinuz-2.6.32-504.3.3.el6.x86_64 because modpath /lib/modules/2.6.32-504.3.3.el6.x86_64 exists
> supermin helper [00006ms] finished creating kernel
> febootstrap-supermin-helper: open: /lib/modules/2.6.32-696.16.1.el6.x86_64/modules.dep: No such file or directory

The error is this one.  What happened to the modules.dep file?

> libguestfs: command: run: rm
> libguestfs: command: run: \ -rf /var/tmp/guestfs.S833dI
> libguestfs: trace: launch = -1 (error)
> Fatal error: exception Guestfs.Error("febootstrap-supermin-helper exited with error status 1, see debug messages above")
> libguestfs: trace: close
> libguestfs: closing guestfs handle 0x1f827f0 (state 0)
> libguestfs: command: run: rm
> libguestfs: command: run: \ -rf /tmp/libguestfsteWT6W
> 
> So I guess my question is, can you tell virt-resize to use a different directory other than the paths you have set??
> 
> Is trying to extend a 5.4T disk a sensible thing to do?
> 
> Are there other more interesting options?

Yes, run ‘libguestfs-test-tool’ and attach the complete, unedited
output.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW