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Just read the article y’all
First of all: no, and repeating this nonsense over and over doesn’t make it any more true.
Second of all: I truly will never understand the hatred some people have for docker. If you prefer all bare metal install, then fine. But constantly shouting from the rooftops how useless and bad docker is seems a little silly.
Great way to show off you haven’t actually read any of the article past its title.
Containers are fine but docker is a pain in the ass that lazy people use when they don’t want to provide clean installation/packaging.
How many times have I seen an equivalent of “we use a custom fork of an obsolete version of an unmaintained package, so if you want to compile it yourself good luck because we forgot how we even did it. Alternatively, you can install the docker version”…
People are afraid of what they do not understand. This still holds true here.
And fear leads to hate.
Which eventually leads to the Dark Side
Um no. Containers are not just chroot. Chroot is a way to isolate or namespace the filesystem giving the process run inside access only to those files. Containers do this. But they also isolate the process id, network, and various other system resources.
Additionally with runtimes like docker they bring in vastly better tooling around this. Making them much easier to work with. They are like chroot on steroids, not simply marketing fluff.
The author acknowledges that, the blog post seems to be aimed at demystifying the concept of namespaces by showing that a “container runtime” that only does limited filesystem namespaces (using chroot) is enough to get some widely used containers running (of course without all the nice features and possibilities of the other types of namespaces)
So they say I can run a dozen of different web applications on the same machine all on the same port internally and different port externally and have a reverse proxy forwarding the traffic to the correct port based on the hostname it was called with by simply using a bunch of chrooted environments?
Without the chroot, that’s how shared webhosting works but it can be hundreds or thousands of sites, depending on resource usage and server capacity.
Not that it’s really relevant for the discussion, but yes. You can do that, with or without chroot.
That’s obviously not the point, but we’re already comparing oranges and apples with chroot and containers.
Honestly, since getting into NixOS, I’ve found that much more of an elegant system than Docker or whatever.
You’re comparing apples to oranges. One is a declarative Linux system environment creation solution and the other a daemon that starts sub-system environments using Linux namespaces.
You could in theory use NixOS to define a system environment that you’d run inside of a docker container. It’s a bit harder to get systemd running inside of Docker which NixOS heavily relies on but that’s beside the point. Easier integrations exist for LXD and systemd-nspawn which actually fulfil an equivalent purpose to Docker. The single component that is most comparable to Docker in a typical NixOS deployment would arguably be its init process (systemd), though its use extends far beyond setting up the namespace (the root namespace in this case).
