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It seems like it would be easy to miss if it's in a docker container. Would auditing my docker containers be a good idea?

Also, is there a good command to run to reliably check if Java is installed on a system?

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> Would auditing my docker containers be a good idea

Yes! I frequently review any containers from the cloud I run. Load on isolated VM, start, cursory inspection at least. Then with images I'm happy with we keep them internally, until we need the upgrade.

May I suggest you look into grype[0], or some other similar tool? It can be used to scan images for vulnerabilities. You'll probably find a bunch of vulnerabilities that aren't likely to actually affect you, but still, at least you'll know they're in the images you're running. And maybe you'll start using things like docker-slim[1] on your own images to get rid of those vulnerabilities you do find.

[0]: https://github.com/anchore/grype

[1]: https://github.com/docker-slim/docker-slim

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