I think the point he was making was too many people and projects are turning towards containers as a sort of "end all" where we're abandoning local system dependencies by shipping applications with their own bundled versions of libraries.

My biggest problem with this shift is I'm seeing is people are running their distribution updates and containers are still shipping with vulnerable versions of libraries. So a server admin updates his servers thinking he's all good, No, No he's not because $DEV hasn't updated their container dependencies and now that server gets pwned because here's yet another layer of dependencies I have to deal with on top of the ones I'm maintaining with the OS.

So no, please don't make containers on everything just because you can, because more often than not the container you never intended to be used in production WILL be used in production because someone was lazy and didn't want to deal with the dependencies.

Additionally, to your point, specific node versions? specific yarn versions? Is it really that unreasonable to demand libraries be backwards compatible with warnings on software saying a method is being depreciated? Like I can understand for major revision changes but seriously. I should be able to run the latest version of node and that code still work with warnings telling me that the code I've written will eventually stop working in later versions due to changes in the underlying setup.

My point being, don't weigh on containers as a crutch for badly coded software. Operating systems have moved towards rolling releases, it's about time libraries and programming languages followed suit.

Thanks, you got my point!

And might I add, some people are shipping containers with full unoptimized Ubuntu (or other large distros) for running projects that are kilobytes in size

In what scenario does compromising a container pwn the server?

If the server is running just for that container's application, then the server admin knows it is there and needs updating.

Container escapes are a very real security threat that need to be taken seriously. Just like you wouldn't let all your users have a remote shell on your machines even if they are locked down. Just because they can't get anywhere doesn't mean they can't find ways out of that. If you're on the machine and can run whatever code you want, it's not a matter of if, it's when.

The admin may know what applications they are running in the container but I can bet you they don't know every library that container is shipping and I hold very little faith that these admins are going to pin a laundry list of every single container they run along with all the different versions of libraries each container is bringing and constantly checking that list for CVEs. This problem increases for every single container you bring onto that server.

Edit:

I love containers, don't get me wrong. I've seen first-hand how incredible it is to be able to set up an application inside a container and then remove that application and have no residual packages containing the libraries and dependencies that program needed. I get it. I just don't like how dependent we've become on them.

Now I'm a network engineer first, and server admin second. I don't want to spend a majority of my time pinging container maintainers to update their dependencies when an updated version of a library comes out. I expect to be able to update my local copy of that library and get on with my day and not have to worry about when this library is going to get patched in each of those containers.

I agree with every word, well stated.