Licensing DXP in Docker
If you’re using a DXP trial license that’s expiring or you have a new license (activation key) you must install, you can replace your container’s existing license.
Here’s an example license expiration log message:
ERROR [fileinstall-directory-watcher][LicenseManager:?] DXP Development license is expired
Each DXP Docker image contains a temporary trial license (trial-dxp-license-[id-number].xml) that expires one month after the image was created.
Here’s how to replace a license:
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Open a Bash shell in your container. docker exec -it [container] bash
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Remove the existing license files. rm /opt/liferay/data/license/*
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Remove all trial licenses and activation key files from the OSGi modules folder. rm /opt/liferay/osgi/modules/*license*.xml /opt/liferay/osgi/modules/*activation*.xml
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Exit the Bash shell. exit
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Copy the new license/key file to the container. docker cp [license file] [container]:/opt/liferay/deployAlternatively, if you have associated a bind mount with the container, you can copy the license/key file to the folder mapped to /mnt/liferay/deploy.See Providing Files to the Container for more information. 
DXP logs the license installation. For example,
INFO  [fileinstall-directory-watcher][LicenseManager:?] License registered for DXP Development
INFO  [com.liferay.portal.kernel.deploy.auto.AutoDeployScanner][AutoDeployDir:?] Processing trial-dxp-license-123.xml
INFO  [fileinstall-directory-watcher][LicenseManager:?] DXP Development license validation passed
INFO  [fileinstall-directory-watcher][LicenseManager:?] License registered for DXP Development
Congratulations on updating your DXP license!