open-nomad/website/source/docs/upgrade/upgrade-specific.html.md

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docs	Upgrading Specific Versions	docs-upgrade-specific	Specific versions of Nomad may have additional information about the upgrade process beyond the standard flow.

Upgrading Specific Versions

The upgrading page covers the details of doing a standard upgrade. However, specific versions of Nomad may have more details provided for their upgrades as a result of new features or changed behavior. This page is used to document those details separately from the standard upgrade flow.

Nomad 0.4.0

Nomad 0.4.0 has backward incompatible changes in the logic which removes services which are no longer referenced by any running task on clients. An in-place upgrade of the Nomad client is going to result in some stray services on the client.

We recommend draining a node before upgrading to 0.4.0 and then re-enabling the node once the upgrade is complete.

Nomad 0.3.1

Nomad 0.3.1 removes artifact downloading from driver configs and places them as a first class element of the task. As such, jobs will have to be rewritten in the proper format and resubmitted to Nomad. Nomad clients will properly re-attach to existing tasks but job definitions must be updated before they can be dispatched to clients running 0.3.1.

Nomad 0.3.0

Nomad 0.3.0 has made several substantial changes to job files included a new log block and variable interpretation syntax (${var}), a modified restart policy syntax, and minimum resources for tasks as well as validation. These changes require a slight change to the default upgrade flow.

After upgrading the version of the servers, all previously submitted jobs must be resubmitted with the updated job syntax using a Nomad 0.3.0 binary.

• All instances of $var must be converted to the new syntax of ${var}

• All tasks must provide their required resources for CPU, memory and disk as well as required network usage if ports are required by the task.

• Restart policies must be updated to indicate whether it is desired for the task to restart on failure or to fail using mode = "delay" or mode = "fail" respectively.

• Service names that include periods will fail validation. To fix, remove any periods from the service name before running the job.

After updating the Servers and job files, Nomad Clients can be upgraded by first draining the node so no tasks are running on it. This can be verified by running nomad node-status <node-id> and verify there are no tasks in the running state. Once that is done the client can be killed, the data_dir should be deleted and then Nomad 0.3.0 can be launched.