Comment 4 for bug 1303934

I think I just hit this problem with MAAS 1.7.2 with a trusty virtual setup on my laptop, I'll hopefully keep this for a few days to test a Chef bug so let me know if you need any more information:

ubuntu@maas-node-1:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
ubuntu@maas-node-1:~$ dpkg -l | grep cloud-init
ii cloud-init 0.7.5-0ubuntu1.5 all Init scripts for cloud instances
ii cloud-initramfs-dyn-netconf 0.25ubuntu1 all write a network interface file in /run for BOOTIF
ubuntu@maas-node-1:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=ebef096d-3483-4027-abf4-d0621f6f7144 ro
ubuntu@maas-node-1:~$ tail -20 /var/log/cloud-init.log
2015-05-31 17:19:17,681 - url_helper.py[DEBUG]: Please wait 5 seconds while we wait to try again
2015-05-31 17:19:22,685 - url_helper.py[DEBUG]: [0/1] open 'http://192.168.101.2/MAAS/metadata//2012-03-01/meta-data/instance-id' with {'url': 'http://192.168.101.2/MAAS/metadata//2012-03-01/meta-data/instance-id', 'headers': {'Authorization': 'OAuth realm="", oauth_nonce="26709034", oauth_timestamp="1433092762", oauth_consumer_key="uU9KHB7kPK24yZcFrx", oauth_signature_method="PLAINTEXT", oauth_version="1.0", oauth_token="gwF4Eh6beNEqXcg3f6", oauth_signature="%262bj652WEP7dp3NHKxsHZVRaFmhCeUv79"'}, 'allow_redirects': True, 'method': 'GET', 'timeout': 4.0} configuration
2015-05-31 17:19:25,685 - url_helper.py[DEBUG]: Calling 'http://192.168.101.2/MAAS/metadata//2012-03-01/meta-data/instance-id' failed [118/120s]: request error [HTTPConnectionPool(host='192.168.101.2', port=80): Max retries exceeded with url: /MAAS/metadata//2012-03-01/meta-data/instance-id (Caused by <class 'socket.error'>: [Errno 113] No route to host)]
2015-05-31 17:19:25,685 - url_helper.py[DEBUG]: Please wait 5 seconds while we wait to try again
2015-05-31 17:19:30,690 - DataSourceMAAS.py[CRITICAL]: Giving up on md from ['http://192.168.101.2/MAAS/metadata//2012-03-01/meta-data/instance-id'] after 123 seconds
2015-05-31 17:19:30,697 - util.py[WARNING]: No instance datasource found! Likely bad things to come!
2015-05-31 17:19:30,697 - util.py[DEBUG]: No instance datasource found! Likely bad things to come!
Traceback (most recent call last):
  File "/usr/bin/cloud-init", line 242, in main_init
    init.fetch()
  File "/usr/lib/python2.7/dist-packages/cloudinit/stages.py", line 308, in fetch
    return self._get_data_source()
  File "/usr/lib/python2.7/dist-packages/cloudinit/stages.py", line 236, in _get_data_source
    pkg_list)
  File "/usr/lib/python2.7/dist-packages/cloudinit/sources/__init__.py", line 260, in find_source
    raise DataSourceNotFoundException(msg)
DataSourceNotFoundException: Did not find any data source, searched classes: (DataSourceMAAS)
2015-05-31 17:19:30,702 - util.py[DEBUG]: Reading from /proc/uptime (quiet=False)
2015-05-31 17:19:30,703 - util.py[DEBUG]: Read 14 bytes from /proc/uptime
2015-05-31 17:19:30,703 - util.py[DEBUG]: cloud-init mode 'init' took 124.041 seconds (124.04)
ubuntu@maas-node-1:/var/lib/cloud/data$ cat previous-datasource
DataSourceMAAS: DataSourceMAAS [http://192.168.101.2/MAAS/metadata/]

^^^ Interesting bit, I'm switching between two MAASes (testing 1.8 which is [powered off] at 192.168.101.2)

root@maas-node-1:/var/lib/cloud/instances/node-bec4d2f6-0652-11e5-b1c1-525400cad0ca# cat datasource
DataSourceMAAS: DataSourceMAAS [http://192.168.101.2/MAAS/metadata/]
root@maas-node-1:/var/lib/cloud/instances/node-bec4d2f6-0652-11e5-b1c1-525400cad

******

ubuntu@maas17:~$ dpkg -l | grep 'maas '
ii maas 1.7.5+bzr3369-0ubuntu1~trusty1 all MAAS server all-in-one metapackage
ubuntu@maas17:~$ ifconfig eth0 | head -2
eth0 Link encap:Ethernet HWaddr 52:54:00:XX:YY:ZZ
          inet addr:192.168.101.3 Bcast:192.168.101.255 Mask:255.255.255.0