[Libguestfs] Need Help

Priyanka Ranjan priyanka3rdfeb at gmail.com
Wed Sep 17 14:29:03 UTC 2014 

Hello Richard,

I thought to move to CentOS 6.5 and capture the performance data to start
with. unfortunately I cant move to CentOS 7. But now I am facing very
strange issue the "libguestfs launch" is failing. I tried to debug but
could not fix this issue. I am attaching all logs below. I am just trying
to execute a command "time guestfish -a /dev/null run"  mentioned in the
performance page. I found that " sudo yum install libguestfs-tools"
installed "libguestfs-tools-1.20.x" on CentOS 6.5. I have captured output
of  all the commands which I have executed. Am I missing something here?

Thanks a lot for all your help in advance,



[root at PriyankaVM ~]# cat /etc/*issue*

CentOS release 6.5 (Final)
Kernel \r on an \m

[root at PriyankaVM ~]# sudo yum install libguestfs-tools

[root at PriyankaVM ~]# rpm -qa|grep guest
libguestfs-tools-1.20.11-2.el6.x86_64
libguestfs-tools-c-1.20.11-2.el6.x86_64
vmware-tools-plugins-guestInfo-9.4.0-1.el6.x86_64
libguestfs-1.20.11-2.el6.x86_64
vmware-tools-guestlib-9.4.0-1.el6.x86_64



[root at PriyankaVM ~]# time guestfish -a /dev/null run
libguestfs: error: /usr/libexec/qemu-kvm exited with error status 1.
To see full error messages you may need to enable debugging.
See http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs

real    0m26.704s
user    0m10.964s
sys     0m6.028s

[root at PriyankaVM ~]# export LIBGUESTFS_DEBUG=1
[root at PriyankaVM ~]# export LIBGUESTFS_TRACE=1


[root at PriyankaVM ~]# libguestfs-test-tool
     ************************************************************
     *                    IMPORTANT NOTICE
     *
     * When reporting bugs, include the COMPLETE, UNEDITED
     * output below in your bug report.
     *
     ************************************************************
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
LIBGUESTFS_DEBUG=1
LIBGUESTFS_TRACE=1
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
SELinux: Enforcing
libguestfs: trace: add_drive "/tmp/libguestfs-test-tool-sda-k3It4V"
"format:raw"
libguestfs: trace: add_drive = 0
libguestfs: trace: version
libguestfs: trace: version = <struct guestfs_version *>
library version: 1.20.11rhel=6,release=2.el6
libguestfs: trace: get_append
libguestfs: trace: get_append = "NULL"
guestfs_get_append: (null)
libguestfs: trace: get_attach_method
libguestfs: trace: get_attach_method = "appliance"
guestfs_get_attach_method: appliance
libguestfs: trace: get_autosync
libguestfs: trace: get_autosync = 1
guestfs_get_autosync: 1
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
guestfs_get_cachedir: /var/tmp
libguestfs: trace: get_direct
libguestfs: trace: get_direct = 0
guestfs_get_direct: 0
libguestfs: trace: get_memsize
libguestfs: trace: get_memsize = 500
guestfs_get_memsize: 500
libguestfs: trace: get_network
libguestfs: trace: get_network = 0
guestfs_get_network: 0
libguestfs: trace: get_path
libguestfs: trace: get_path = "/usr/lib64/guestfs"
guestfs_get_path: /usr/lib64/guestfs
libguestfs: trace: get_pgroup
libguestfs: trace: get_pgroup = 0
guestfs_get_pgroup: 0
libguestfs: trace: get_qemu
libguestfs: trace: get_qemu = "/usr/libexec/qemu-kvm"
guestfs_get_qemu: /usr/libexec/qemu-kvm
libguestfs: trace: get_recovery_proc
libguestfs: trace: get_recovery_proc = 1
guestfs_get_recovery_proc: 1
libguestfs: trace: get_selinux
libguestfs: trace: get_selinux = 0
guestfs_get_selinux: 0
libguestfs: trace: get_smp
libguestfs: trace: get_smp = 1
guestfs_get_smp: 1
libguestfs: trace: get_tmpdir
libguestfs: trace: get_tmpdir = "/tmp"
guestfs_get_tmpdir: /tmp
libguestfs: trace: get_trace
libguestfs: trace: get_trace = 1
guestfs_get_trace: 1
libguestfs: trace: get_verbose
libguestfs: trace: get_verbose = 1
guestfs_get_verbose: 1
host_cpu: x86_64
Launching appliance, timeout set to 600 seconds.
libguestfs: trace: launch
libguestfs: trace: get_tmpdir
libguestfs: trace: get_tmpdir = "/tmp"
libguestfs: launch: attach-method=appliance
libguestfs: launch: tmpdir=/tmp/libguestfsUpuW0B
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/2.6.32-431.11.2.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
supermin helper [00002ms] finished creating kernel
supermin helper [00002ms] visiting /usr/lib64/guestfs/supermin.d
supermin helper [00003ms] visiting /usr/lib64/guestfs/supermin.d/base.img
supermin helper [00003ms] visiting /usr/lib64/guestfs/supermin.d/daemon.img
supermin helper [00003ms] visiting /usr/lib64/guestfs/supermin.d/hostfiles

supermin helper [00111ms] visiting /usr/lib64/guestfs/supermin.d/init.img
supermin helper [00113ms] visiting
/usr/lib64/guestfs/supermin.d/udev-rules.img
supermin helper [00113ms] adding kernel modules
supermin helper [00278ms] finished creating appliance
libguestfs: checksum of existing appliance:
b81afcfba02c9dc60949034595a88ebf29731923a9ef273af22835a3f4798d2e
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
libguestfs: [00293ms] begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -help
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -version
libguestfs: qemu version 0.12
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: error: /usr/libexec/qemu-kvm exited with error status 1, see
debug messages above
libguestfs: trace: launch = -1 (error)
libguestfs-test-tool: failed to launch appliance
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1eacd70 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfsUpuW0B



[root at PriyankaVM ~]# time guestfish -a /dev/null run
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x221f2b0
libguestfs: trace: set_pgroup true
libguestfs: trace: set_pgroup = 0
libguestfs: trace: add_drive "/dev/null"
libguestfs: trace: get_tmpdir
libguestfs: trace: get_tmpdir = "/tmp"
libguestfs: trace: add_drive = 0
libguestfs: trace: launch
libguestfs: launch: attach-method=appliance
libguestfs: launch: tmpdir=/tmp/libguestfsANZENV
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/2.6.32-431.11.2.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
supermin helper [00002ms] finished creating kernel
supermin helper [00002ms] visiting /usr/lib64/guestfs/supermin.d
supermin helper [00002ms] visiting /usr/lib64/guestfs/supermin.d/base.img
supermin helper [00002ms] visiting /usr/lib64/guestfs/supermin.d/daemon.img
supermin helper [00002ms] visiting /usr/lib64/guestfs/supermin.d/hostfiles
supermin helper [00107ms] visiting /usr/lib64/guestfs/supermin.d/init.img
supermin helper [00114ms] visiting
/usr/lib64/guestfs/supermin.d/udev-rules.img
supermin helper [00114ms] adding kernel modules
supermin helper [00192ms] finished creating appliance
libguestfs: checksum of existing appliance:
b81afcfba02c9dc60949034595a88ebf29731923a9ef273af22835a3f4798d2e
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
libguestfs: [00198ms] begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -help
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -version
libguestfs: qemu version 0.12
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: error: /usr/libexec/qemu-kvm exited with error status 1, see
debug messages above
libguestfs: trace: launch = -1 (error)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x221f2b0 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfsANZENV

real    0m0.341s
user    0m0.086s
sys     0m0.222s


On Sat, Sep 13, 2014 at 7:47 PM, Priyanka Ranjan <priyanka3rdfeb at gmail.com>
wrote:

> Thanks a lot Rechard for your inputs.
>
> On Fri, Sep 12, 2014 at 11:23 PM, Richard W.M. Jones <rjones at redhat.com>
> wrote:
>
>> On Fri, Sep 12, 2014 at 10:40:14PM +0530, Priyanka Ranjan wrote:
>> > Hello Experts,
>> >
>> > I need a help from you . I am using CentOS 6.4 and using guestfish
>> > to modify an ESX image.
>> >
>> > I am adding a disk, executing "run" command and mounting it.  the
>> > "run" command is taking around 50 seconds . Is there any way to
>> > minimize it.
>>
>> So first of all, measure the performance.  Run the simple
>> baseline tests here:
>>
>> http://libguestfs.org/guestfs-performance.1.html#baseline-measurements
>>
>> If, after several runs, this stays at ~ 50 seconds, then it's likely
>> because you are running this inside a virtual machine, on Amazon EC2,
>> or on a machine which has virtualization disabled (eg in the BIOS
>> settings).  You can fix that by using baremetal (or maybe nested virt).
>>
>> You will find other tips in the guestfs-performance(1) man page that I
>> linked to above.
>>
>> > If we can not minimize it then Can we create and keep the guestfish
>> > virtual shell open so that we can just add a disk , mount and modify
>> > the image in few seconds.
>>
>> Yes, but unfortunately not on CentOS 6.  On RHEL / CentOS 7 we support
>> hotplugging in both libguestfs and guestfish, and that lets you do
>> exactly what you describe above.
>>
>>   http://libguestfs.org/guestfs.3.html#hotplugging
>>
>> Rich.
>>
>> --
>> Richard Jones, Virtualization Group, Red Hat
>> http://people.redhat.com/~rjones
>> Read my programming and virtualization blog: http://rwmj.wordpress.com
>> libguestfs lets you edit virtual machines.  Supports shell scripting,
>> bindings from many languages.  http://libguestfs.org
>>
>
>
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