Troubleshooting the Local Provider (LXC)

The LXC Local Provider uses LXC containers to provide nodes for you to deploy on. This section is a collection of best practices for diagnosing and solving LXC Local Provider issues.

Bootstrap fails

Every time bootstrap fails, you'll need to run juju destroy-environment -e local prior to continuing. First let's rerun a bootstrap in debug mode:

juju bootstrap --show-log --debug

This will print very verbose output. If you're receiving connection failed, will retry: dial tcp connection refused error at the end of the run, proceed with the troubleshooting guide. If not the error presented will inform you what went wrong.

In certain cases you might get this something similar to this error: Get dial tcp connection refused.

This can be solved by removing miscellaneous .jenv files in ~/.juju/environments and rerunning the bootstrap command.

Connection failed, will retry

This occurs when the juju API server and Database server fail to start within the allotted timeout. This can occur for one of several reasons. After the bootstrap command fails run the following command:

sudo initctl list | grep juju

You should see two jobs listed. One that starts with juju-db the other juju- agent. If these are both in a start/running state then your machine took longer than juju expected to get these services started.

If either of these have stopped, investigate the logs at /var/log/upstart/juju-db*.log or /var/log/upstart/juju-agent*.log If the juju-db service failed to start with messages of unsupported command-line options, check the version of mongodb installed:

dpkg -l | grep mongodb-server

If you have a version less than 1:2.2.4-0ubuntu1 make sure you have either the Cloud Tools Archive or ppa:juju/stable added to your system. sudo apt-get update then install juju- local package. Before retrying, make sure you run juju destroy-environment

Can't list images

If you are using the lxc commands to view local LXC containers, you must run the commands as root, and use the lxc1 versions of commands. For example:

sudo lxc-ls

For later versions of LXC/LXD (as ship with 16.04), you should use the LXD style commands:

lxc list

No machines start

If you get a successful bootstrap, but services you deploy never come up, there's a chance that you have an older version of the Ubuntu Cloud Image cached on your machine. To verify this, check the timestamp of the contents in /var/cache/lxc/cloud-precise/

ls -lh /var/cache/lxc/cloud-precise/

If the contents of this directory are older than a few weeks, delete files present, destroy the environment with juju destroy-environment, re-bootstrap and attempt deployment again.

Unit KVM / LXC container problems:

You may see unexpected behaviour on a unit when deploying to a nested KVM virtual machine or LXC container via juju deploy --to lxc:# and its KVM equivalent. It can be helpful to capture the output of the commands being run on the unit:

juju set-env 'logging-config=juju.container.kvm=TRACE'
juju set-env 'logging-config=juju.container.lxc=TRACE'

This will increase log verbosity dramatically. When no longer needed the logging level should be reset to its default value:

juju set-env 'logging-config=<root>=WARN'

See Viewing logs.

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