cloud-init

tests: lxd console code breaks when using lxd as snap

Bug #1745663 reported by Joshua Powers
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
cloud-init
Fix Released
Medium
Unassigned

Bug Description

Running the integration tests using the lxd backend fails when lxd is installed as a snap:
https://paste.ubuntu.com/26465769/

The failure is a result of the tests/cloud_tests/platforms/lxd.py:_setup_console_log() function attempting to modify the configuration:

49 cfg = "lxc.console.logfile=%s" % logf
50 orig = self._pylxd_container.config.get('raw.lxc', "")
51 if orig:
52 orig += "\n"
53 self._pylxd_container.config['raw.lxc'] = orig + cfg

LXD logs: https://paste.ubuntu.com/26465860/
My lxd setup/config: https://paste.ubuntu.com/26465838/

The specific issue I believe is that LXD as a snap is confined and does not have access to /tmp (need to confirm this) hence the error message:

console.c:lxc_console_create:561 - No such file or directory - failed to open console log file "/tmp/LXDInstance-cloud-test-ubuntu-xenial-image-modification-em88d5kzvxzdrzsgod029n8iztb/console.log"

See original description

Related branches

~chad.smith/cloud-init:ubuntu/artful
Scott Moser: Pending requested
Diff: 722 lines (+396/-58)
11 files modified
cloudinit/cmd/status.py (+4/-1)
cloudinit/cmd/tests/test_status.py (+28/-7)
cloudinit/net/__init__.py (+46/-17)
cloudinit/net/tests/test_init.py (+91/-0)
cloudinit/sources/DataSourceEc2.py (+6/-0)
cloudinit/ssh_util.py (+1/-4)
debian/changelog (+11/-0)
tests/cloud_tests/collect.py (+3/-2)
tests/cloud_tests/platforms/lxd/instance.py (+106/-26)
tests/unittests/test_datasource/test_ec2.py (+58/-1)
tests/unittests/test_sshutil.py (+42/-0)
~chad.smith/cloud-init:ubuntu/xenial
Scott Moser: Pending requested
Diff: 722 lines (+396/-58)
11 files modified
cloudinit/cmd/status.py (+4/-1)
cloudinit/cmd/tests/test_status.py (+28/-7)
cloudinit/net/__init__.py (+46/-17)
cloudinit/net/tests/test_init.py (+91/-0)
cloudinit/sources/DataSourceEc2.py (+6/-0)
cloudinit/ssh_util.py (+1/-4)
debian/changelog (+11/-0)
tests/cloud_tests/collect.py (+3/-2)
tests/cloud_tests/platforms/lxd/instance.py (+106/-26)
tests/unittests/test_datasource/test_ec2.py (+58/-1)
tests/unittests/test_sshutil.py (+42/-0)
~smoser/cloud-init:bug/1745663-use-lxd-console
Joshua Powers (community): Approve
Server Team CI bot: Approve (continuous-integration)
cloud-init Commiters: Pending requested
Diff: 200 lines (+109/-28)
2 files modified
tests/cloud_tests/collect.py (+3/-2)
tests/cloud_tests/platforms/lxd/instance.py (+106/-26)
Joshua Powers (powersj)
description: updated
Revision history for this message
Scott Moser (smoser) wrote :

I talked with stgraber.
We have a couple options:
a.) if installed from snap, use
   some path down /var/snap/lxd as a console log path
  /var/snap/lxd/common/consoles (chmod 1777) or
  /var/snap/lxd/common/lxd/logs/CONTAINER-NAME/console.log

b.) use console --show-log
this requires liblxc > 3.0.

We could put into place code that did 'a' when it needed to (util.which('lxc').startswith('/snap')) and used 'b' if it could.

Scott Moser (smoser)
Changed in cloud-init:
status: New → Confirmed
importance: Undecided → Medium
Revision history for this message
Scott Moser (smoser) wrote : Fixed in Cloud-init 18.1

This bug is believed to be fixed in cloud-init in 18.1. If this is still a problem for you, please make a comment and set the state back to New

Thank you.

Changed in cloud-init:
status: Confirmed → Fix Released
Revision history for this message
James Falcon (falcojr) wrote :

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3104

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