Re: [Libguestfs] Script to read systemd journal of a guest to find its IP address
On Sat, Jun 14, 2014 at 02:25:59PM +0100, Richard W.M. Jones wrote:
I've pushed a new tool called "virt-log" upstream, so you can now
just do:
virt-log -d Guest
or:
virt-log -a disk.img
Sweet!
Just tested it (after building from git) on a Fedora 20 disk image which
has systemd journal:
$ git log | head -1
fb546eaee064b14ad192a4f0390325ba1b4c766a
$ sudo ./run ./cat/virt-log -a \
/var/lib/libvirt/images/ostack-controller.qcow2 \
| grep "dhclient.*bound"
Jun 10 17:08:30 dhclient[971] info: bound to 192.162.122.118 --
renewal in 1722 seconds.
.
.
It will automatically fetch the journal or traditional syslog file
as
appropriate, and we can add Windows support in future.
Unfortunately the journal_* API calls are rather slow because they
have to fetch each single line from the journal. So there's some work
to be done to make that fast.
Out of curiosity, I just ran the same above invocation w/ `time`. For 5
occurances, it took about 1m13sec. But this was already 2nd invocation
(so applinace caching may have kicked in?):
$ time sudo ./run ./cat/virt-log -a \
/var/lib/libvirt/images/ostack-controller.qcow2 \
| grep "dhclient.*bound"
Jun 10 17:08:30 dhclient[971] info: bound to 192.162.122.118 -- renewal in 1722
seconds.
Jun 10 18:00:48 dhclient[968] info: bound to 192.162.122.118 -- renewal in 1429
seconds.
Jun 10 18:18:32 dhclient[970] info: bound to 192.169.142.118 -- renewal in 1391
seconds.
Jun 10 18:41:43 dhclient[970] info: bound to 192.169.142.118 -- renewal in 1262
seconds.
Jun 10 19:02:46 dhclient[970] info: bound to 192.169.142.118 -- renewal in 1567
seconds.
^C
real 1m13.594s
user 0m8.272s
sys 0m42.631s
--
/kashyap