One: containers as an isolation mechanism. On Linux this is the set of cgroups, seccomp and friends that can be used to isolate processes or groups of processes.
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Two: containers as a packaging mechanism. Mostly popularized by Docker, this is about taking some code and a closure of its dependencies, and packaging them all up together along with some metadata.
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Three: containers as a design philosophy. This stems from the idea that if we can package and isolate software it becomes easy to run. The emphasis here is on software, rather than services, and standardized tooling trying to simplify operations.
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Four: containers as an ecosystem. This is where all the Proper Nouns come in. These things are useful, but are one embodiment of a set of ideas, rather than an end to themselves.
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I think people under appreciate how independent these are. We could replace containers-as-isolation with MicroVMs with no real change in operational properties. Containers-as-packaging could be replaced with static linking with no real change (except less convenience).
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The design philosophy is as applicable to instances, and mostly to functions, as it is to containers.
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I don't have alternative terminology to propose, but I think it would simplify a lot of conversations if people were more clear about which of these (or other things) they are talking about.
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You’re overlooking the fifth: magical management funding pixie dust
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Once I heard that containers were the way to implement microservices. Naturally, my follow-up question was to define microservices. The person said that microservices are based on containers for creating isolated modules of an app. I felt he entered in a jargon’s loop.
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I always think of them in terms of 1 and 2 together (never in isolation - pardon the pun!) - I personally would never use the term in the context of architecture, because architectures are typically not homogenous. I see containers as an implementation detail.
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Čini se da učitavanje traje već neko vrijeme.
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