3/18/2023 0 Comments Easycloud mac![]() ![]() Kubernetes needs at least 1GB of RAM so it doesn’t run on lower-end IoT hardware and the binaries are particularly large. See a diagram by Julia Evans on the internals of Kubernetes ![]() An example would be the kubelet (runs containers), kubectl client CLI and apiserver which runs on hosts to provide access to the API. It has a UNIX flavour in that it is separated out into a dozen separate projects which combine to become a distribution. Kubernetes takes a different approach to system-building. The binaries are so small they can even run on a Raspberry Pi with 512mb of RAM. Internally it makes use of runc for spinning up containers and the SwarmKit project provides orchestration. Docker Swarm comes built into every Docker installation since Docker 1.12 and forms part of the main binary.ĭid you know there was a pre-runner to Docker Swarm which was also called Swarm? Before Docker’s 1.12 release there was an earlier project called Swarm that existed as a separate set of binaries using Docker’s remote API.Īlthough many projects and components make up Docker’s Linux distribution it comes in just a few binaries: the client, the daemon and containerd. They are beyond the scope of this post but have similar concepts.ĭocker Swarm is packaged in two products – Docker CE (free and open-source) and Docker EE (for enterprise and business). EC2 container service / Azure Container Service. Other projects are available such as: Rancher Cattle, Mesosphere and cloud-based i.e. Let’s chalk-up some of the differences between the two platforms. So if you are running an application in production then you need to look into whether orchestration can help. Secret management (it becomes easier to share secrets securely between hosts).Fault tolerance (if one of your replicas becomes unhealthy or crashes, it can be restarted automatically).High availability (more than one replica of your code running at once).Orchestration (the platform decides where code should run).Clustering (computing power is bonded across multiple machines).Here are some of the features these platforms enable: ![]() If you are a regular GitHub user – then behind the scenes the Kubernetes code is keeping things running for you. For instance ADP who provide iHCM and Payroll in the USA use Docker’s EE product (which is based around Swarm) to run some of their key systems.ĪDP’s Jim Ford told me: there are 600 nodes running EE with 40% of those in the production datacenters. What has orchestration done for you lately?Įven if you are not using Kubernetes or Swarm for your internal projects – it doesn’t mean that you’re not benefitting from their use. ![]()
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