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Update DTR upgrade docs (#5299)

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Joao Fernandes 2017-11-14 15:22:03 -08:00 committed by GitHub
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datacenter/dtr/2.4/guides/admin/upgrade.md
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@ -4,6 +4,8 @@ description: Learn how to upgrade your Docker Trusted Registry
keywords: dtr, upgrade, install
---
{% assign previous_version="2.3" %}
DTR uses [semantic versioning](http://semver.org/) and we aim to achieve specific
guarantees while upgrading between versions. We never support downgrading. We
support upgrades according to the following rules:
@ -39,13 +41,14 @@ to ensure the impact on your business is close to none.
Before starting your upgrade, make sure that:
* The version of UCP you are using is supported by the version of DTR you
are trying to upgrade to.
are trying to upgrade to. [Check the compatibility matrix](https://success.docker.com/Policies/Compatibility_Matrix).
* You have a recent [DTR backup](backups-and-disaster-recovery.md).
* You [disable Docker content trust in UCP](/datacenter/ucp/2.2/guides/admin/configure/run-only-the-images-you-trust.md).
### Step 1. Upgrade DTR to 2.2 if necessary
### Step 1. Upgrade DTR to {{ previous_version }} if necessary
Make sure you're running DTR 2.2. If that's not the case, [upgrade your installation to the 2.2 version](/datacenter/dtr/2.2/guides/admin/upgrade.md).
Make sure you're running DTR {{ previous_version }}. If that's not the case,
[upgrade your installation to the {{ previous_version }} version](/datacenter/dtr/{{ previous_version }}/guides/admin/upgrade.md).
### Step 2. Upgrade DTR