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When two processes run on the same machine, they are somewhat isolated. For example, they cannot read each other’s memory. However, they still share the same file system, libraries, network ports. And hardware: CPU and memory. Docker allows running processes with greater isolation on a Linux machine. Processes like: web servers, databases or web applications. Traditionally, to achieve better isolation, virtual machines were used. Virtual machine is essentially an operating system started inside of another operating system. For example, Windows running inside Linux. Typically you run a few VMs on a single host. Unfortunately, a virtual machine has an overhead. It takes several seconds to start and uses a significant amount of memory. Docker is somewhere in between. Better isolation than plain processes, but it’s not quite yet a VM.
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Jest to odcinek podkastu:
Around IT in 256 seconds
Podcast for developers, testers, SREs... and their managers. I explain complex and convoluted technologies in a clear way, avoiding buzzwords and hype. Never longer than 4 minutes and 16 seconds. Because software development does not require hours of lectures, dev advocates' slide decks and hand waving. For those of you, who want to combat FOMO, while brushing your teeth. 256 seconds is plenty of time. If I can't explain something within this time frame, it's either too complex, or I don't understand it myself.
By Tomasz Nurkiewicz. Java Champion, CTO, trainer, O'Reilly author, blogger
Kategorie:
Technologia
Technologia