Magento 2.1.18 is the final 2.1.x release. After June 2019, Magento 2.1.x will no longer receive security patches, quality fixes, or documentation updates.
To maintain your site's performance, security, and PCI compliance, upgrade to the latest version of Magento.

Step 2. Readiness check

The readiness check makes sure your server and environment are set up correctly for upgrading components. In the event of errors, you can consult troubleshooting suggestions in this guide.

Start the readiness check

To start, click either Start Readiness Check or Next on the System Upgrade page. A sample follows.

The readiness check enables you to find out if your server and environment are ready to proceed

After the readiness check completes, see one of the following:

Readiness check success

The following figure shows an example of a successful readiness check. If all tests passed, click Next and continue with the next step.

If all readiness checks pass, click Next and continue with the next step

Readiness check failure

Messages similar to the following display if any readiness check fails.

You must resolve all readiness check failures before you continue

In the event of failure, see one of the following sections:

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