[Libguestfs] Script to read systemd journal of a guest to find its IP address
Heya,
Thanks Rich for the hints on IRC about journal bindings for libguestfs.
The below script is what I ended up with. At least I learnt how to
iterate over the systemd journal entries.
$ sudo python find-ip.py
192.162.122.118
Obviously, this only searches for the _first_ occurance of the IP
address and doesn't take into account the guest may have acquired a new
IP on a later reboot. (I guess I'd have to do some thing like
$ journalctl --lines=500 | egrep -i 'dhclient.*bound').
-------------------------------------------------------------------
#!/usr/bin/python
#-----------------------------------------------------------------
# PURPOSE: To find what IP address a guest has acquired from DHCP
#-----------------------------------------------------------------
image = "/var/lib/libvirt/images/ostack-controller.qcow2"
root_filesystem = "/dev/fedora/root"
import os
import sys
import re
import guestfs
g = guestfs.GuestFS ()
g.add_drive (image, format='qcow2')
g.launch ()
#print g.list_partitions()
# Set trace
#g.set_trace (1)
g.mount_options ("ro", root_filesystem, "/")
# Open the journal
g.journal_open ("/var/log/journal")
# Loop over the journal to find a specific string
count = 0
prog = re.compile("dhclient.*bound")
while g.journal_next():
count += 1
output = g.journal_get()
#print output
flag = 0
for i in output:
if i['attrname']=="MESSAGE" and
i['attrval'].startswith("bound"):
print i['attrval'].split()[2]
flag = 1
break
if flag == 1:
break
# Close the journal handle
g.journal_close ()
# Unmount all the file system(s)
g.umount_all ()
g.sync ()
sys.exit(0)
-------------------------------------------------------------------
--
/kashyap