The server doesn't trust the client's signing certificate authority since the server doesn't verify DNS for the client certificate and the error indicates this is a remote error not on the client. The certificate's DN doesn't match the hostname The client doesn't trust the server's signing certificate authority The server doesn't trust the client's signing certificate authority This means your client's certificate is invalid because either: The referenced file must contain one or more certificates authorities to use to validate client certificates presented to the API server. TL DR: Docker has in the most cases no relevant performance penalty at all namespacing instead of virtualization is the reason why.įrom the documentation you linked, it states, If you use storage in a container, you usually don't write it into the container itself (though you can), but in a separate volume mounted when spinning up the container and those are like normal Linux mounts, i.e. pack many layers into one, which would alleviate such problems (and conversely, you can mount unionfs-style filesystems in pure Linux as well, and those will have exactly the same performance overhead).īut incidentally his overhead is mostly negligible because something like your standard microservice will load once, and then just run.
There are options when building images to avoid this, i.e.
There is one single difference, which is the filesystem and this is not due to virtualization of any kind, but due to the "onion" style of layering many filesystems on top of each other. That's the beauty of it, that's also why a docker container spins up very quickly with almost no overhead, and why the actual runtime also has no appreciable overhead. are exactly the same, no matter whether a process runs inside a Docker container or on the host itself. All aspects regarding accessing kernel ressources/hardware/networking etc. Modern Linux kernels have namespaces for all their internal data structures (from user IDs to network interfaces to process tables). It is more or less the same as just running the process without a container.ĭocker is based on the concept of namespaces.
There is no significant overhead in the form of RAM usage. There is no extra layer between the processes running inside the Docker container and the host kernel. One would indeed not deploy each microservice in their own VM, which would be an incredible waste of resources.īut Docker is different. I'll ignore your usage of the word "VM" here, since you have "Docker" in the title and "container" in the tags.
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