juju devel 1.22-beta1 is released

Mon Jan 26 22:22:29 UTC 2015

# juju-core 1.22-beta1

A new development release of Juju, juju-core 1.22-beta1, is now available.

## Getting Juju

juju-core 1.22-beta1 is available for utopic and backported to earlier
series in the following PPA:

    https://launchpad.net/~juju/+archive/devel

The devel packages in this archive use the devel simple-streams.
You must configure the 'agent-stream' option in your
environments.yaml to use the matching juju agents.

    agent-stream: devel

Upgrading from stable releases to development releases is not
supported. You can upgrade test environments to development releases
to test new features and fixes, but it is not advised to upgrade
production environments to 1.22-beta1.

## Notable Changes

  * Blocking changes to the environment
  * LXC image caching and the cached-images command
  * Juju state backup improvements
  * Static internal route for Joyent instances
  * The instance availability zone is exposed to charms
  * Relaxed checked for container scoped relations
  * New annotations client includes charms and bulk calls
  * Upgrade robustness
  * Multi-environment infrastructure

### Blocking changes to the environment

The 'block' and 'unblock' commands control which changes can be made to
a running environment. Use the 'block' command to lockdown the
environment to prevent accidental changes. Three levels of restrictions
can be applied, 'destroy-environment', 'remove-object', and
'all-changes'.

The 'destroy-environment' level blocks just the 'destroy-environment'
command. You can prevent an environment from being destroyed like this:

    juju block destroy-environment

The 'remove-object' level blocks the 'destroy-environment',
'remove-machine', 'remove-relation', 'remove-service', and 'remove-unit'
commands from being run. You can prevent the machines, services, units
and relations from being removed thusly:

    juju block remove-object

The 'all-changes' level blocks commands that add, alter, or remove
things in the running environment. These commands are blocked:
'add-machine', 'add-relation', 'add-unit', 'authorised-keys add',
'authorised-keys delete', 'authorised-keys import', 'deploy',
'destroy-environment', 'ensure-availability', 'expose', 'resolved',
'remove-machine', 'remove-relation', 'remove-service', 'remove-unit',
'retry-provisioning', 'run', 'set', 'set-constraints', 'set-env',
'unexpose', 'unset', 'unset-env', 'upgrade-charm', 'upgrade-juju',
'user add', 'user change-password', 'user disable', and 'user enable'
You can lockdown the environment to prevent all changes like this:

    juju block all-changes

When a command is blocked, and you are certain you need to alter the
environment, you can remove the block using the 'unblock' command. For
example, to permit the remove-relation command blocked by the
'remove-object' level, run:

    juju unblock remove-object

You can restore the block after you complete your changes.

Note that some commands have a '--force' option, which bypasses the
restrictions set by 'block'. Only use the '--force' option *after* the
command was run without it to ensure you are aware of the restrictions
set on the environment by the 'block' command.

For more information run 'juju help block' and 'juju help unblock'.

### LXC image caching and the cached-images command

>From Juju 1.22 onwards, LXC images are cached in the Juju environment
when they are retrieved to instantiate a new LXC container. This applies
to the local provider and all other cloud providers. This caching is
done independently of whether image cloning is enabled.

Note: Due to current upgrade limitations, image caching is currently not
available for machines upgraded to 1.22. Only machines deployed with
1.22 will cache the images.

In Juju 1.22, lxc-create is configured to fetch images from the Juju
state server. If no image is available, the state server will fetch the
image from http://cloud-images.ubuntu.com and then cache it. This means
that the retrieval of images from the external site is only done once
per *environment*, not once per new machine which is the default
behaviour of lxc. The next time lxc-create needs to fetch an image, it
comes directly from the Juju environment cache.

The 'cached-images' command can list and delete cached LXC images stored
in the Juju environment. The 'list' and 'delete' subcommands support
'--arch' and '--series' options to filter the result.

To see all cached images, run:

    juju cached-images list

Or to see just the amd64 trusty images run:

    juju cached-images list --series trusty --arch amd64

To delete the amd64 trusty cached images run:

  juju cache-images delete --series trusty --arch amd64

Future development work will allow Juju to automatically download new
LXC images when they becomes available, but for now, the only way update
a cached image is to remove the old one from the Juju environment. Juju
will also support KVM image caching in the future.

See 'juju cached-images list --help' and 'juju cached-images delete
--help' for more details.

### Juju state backup improvements

The backup CLI plugin is replaced by the native 'backups' command. The
command can create, manage, and restore state backups. The new backup
features are also available using the API endpoints too.

You can create a backup like this:

    juju backups create

Backups are kept on the state-server by default, but you can use the
'download' and 'upload' subcommands to move backups between locations.

    juju backups download <id>
    juju backups upload <filename>

You can list the backups and see info about a specific backup using
these subcommands:

    juju backups list
    juju backups info <id>

You can remove unwanted backups like this:

    juju backups remove <id>

The juju 'restore' command is unchanged. You can learn more about
backups by reading the details of 'juju help backups'.

### The instance availability zone is exposed to charms

Charms can query the 'JUJU_AVAILABILITY_ZONE' environmental variable to
learn the instance's availability zone. Not all clouds/providers support
availability zones, but this information is available when the charm is
deployed in EC2 and HP Cloud for example.

### Relaxed checked for container scoped relations

Container scoped relations are now allowed as long a there is at least
one subordinate service involved. Previously there had to be exactly one
subordinate service in the relation.

### Static internal route for Joyent instances

When running in Joyent, Juju creates a static route to ensure that it is
always possible for instance to communicate over the internal network
interface.

### New annotations client includes charms and bulk calls

The new api.annotations.client supports annotating charms, the
environment, machines, services, and units. It supports bulk calls. The
old api.client annotation functions are deprecated.

The SET annotations call takes this form:

    {
        "Type": "Annotations",
        "Request": "Set",
        "Params": {
             "Annotations": {{
                 "EntityTag": a, "Annotations": pairs1
                 },{
                 "EntityTag": b, "Annotations": pairs2
             }}
    }

The corresponding GET annotations call takes this form:

    {
        "Type": "Annotations",
        "Request": "Get",
        "Params": {
           "Entities": {
               {Entity {"Tag": a}},
               {Entity {"Tag": b},
           }
        }
    }

The GET response looks like this:

    {
        "Results": {
            {"EntityTag": a, "Annotations": pairs1, "Error": nil},
            {"EntityTag": b, "Annotations": pairs2, "Error": nil},

        }
    }

### Juju upgrade robustness

During Juju upgrades (the 'upgrade-juju' command), steps specific to
Juju state-servers are now run before other upgrade steps. Database
migrations on the state-server are completed before machine updates and
updates of the Juju agents on deployed units.

### Multi-environment infrastructure

Juju will soon be able to support multiple environments managed by a
single state server (or state server cluster).  Although this is not yet
visible, version 1.22 includes much of the infrastructure changes for
multi-environment support.

## Resolved issues

  * Interface mtu management across maas/juju
    Lp 1355813

  * State server certificate has empty san list
    Lp 1397909

  * Api server restarts soon after state server comes up
    Lp 1403721

  * Cmdline: implement juju environment jenv
    Lp 1409784

  * Juju should wait until a node's status is 'deployed' to attempt
    ssh'ing into it
    Lp 1394680

  * Lock contention running apt in bootstrap
    Lp 1384259

  * Juju status --format summary panics with unresolvable ips
    Lp 1410320

  * Machine hasvote/wantsvote should be included in allwatcher deltas
    Lp 1402965

  * Open-stack provider breaks swift with standard config
    Lp 1312217

  * 'juju switch' should not require an entry in environments.yaml
    Lp 1334768

  * Provider/maas: stopinstances may fail if nodes are removed out of
    band
    Lp 1319016

Finally

We encourage everyone to subscribe the mailing list at
juju-dev at lists.canonical.com, or join us on #juju-dev on freenode.

-- 
Curtis Hovey
Canonical Cloud Development and Operations
http://launchpad.net/~sinzui