etcd, https://coreos.com/etcd/, is a distributed key/value store and contains all details about a kubernetes cluster, such as resources and their states. How etcd is installed I install kubernetes, and etcd along with it, using kubespray https://github.com/kubernetes-incubator/kubespray Interacting with etcd etcd runs as a container. The startup script used by systemctl is /usr/local/bin/etcd, which has the… Continue reading
Posts tagged kubernetes
Self-service access control in kubernetes
One of the most significant benefits of containers is that they empower a software engineer to explore technologies and infrastructure decisions quickly. Containers make it possible for a developer to try on new technologies and platforms and consider infrastructure decisions without a long approval and requisition process. It also reduces cost significantly, since many containers… Continue reading
Generate TLS Secret for kubernetes
Often in development or when working on proofs of concept (PoC), I need working SSL to protect an endpoint. If I controlled the domain, I would use Lets Encrypt to generate a certificate. When I don’t control the domain, I often use self signed certificates. Below is how I create them and then use them… Continue reading
Kubernetes bootcamp
Introduction Kubernetes (also written k8s) is a powerful container orchestration platform that works with Docker. This first video provides a high level explanation of how kubernetes differs from traditional application deployment and infrastructure management. Overview A kubernetes cluster is made up of masters and nodes. The masters are responsible for orchestration and the nodes host… Continue reading
kubernetes overview
Kubernetes is getting a lot of attention recently, and there is good reason for that. Docker containers alone are little more than a developer convenience. Orchestration moves containers from laptop into the datacenter. Kubernetes does that in a way that simplifies development and operations. Unfortunately I struggled to find easy to understand high level descriptions… Continue reading
Infrastructure as Code
One of the most significant enablers of IT and software automation has been the shift away from fixed infrastructure to flexible infrastructure. Virtualization, process isolation, resource sharing and other forms of flexible infrastructure have been in use for many decades in IT systems. It can be seen in early Unix systems, Java application servers and… Continue reading
Kubernetes vs. Docker Datacenter
I found this article on serverwatch today: http://www.serverwatch.com/server-trends/why-kubernetes-is-all-conquering.html It’s not technically deep, but it does highlight the groundswell of interest for and adoption of kubernetes. It’s also worth noting that GCE and Azure will now both have a native, fully managed kubernetes offering. I haven’t found a fully managed docker datacenter offering, but I’m sure… Continue reading
High level view of Container Orchestration
Container orchestration is at the heart of a successful container architecture. Orchestration takes as input a definition of how a deployed application should look. This usually includes how many containers for a certain image are needed, volumes for persistent data, networking for communication between containers and awareness of various discovery mechanisms. Discovery may include such… Continue reading