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 docker
Let’s Encrypt quicker start
In spite of the popularity of Let’s Encrypt for generating free SSL/TLS certificates, I think their getting started page stinks. In case you feel the same way, I’ll try to give you a real quick start that will get you to your first certificate. Certificate Authority Let me point out that anyone with Linux (or… 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
IT General Controls: Infrastructure vs Routing
IT general controls are important for various reasons, such as business continuity and regulatory compliance. Traditionally, controls have focused on the infrastructure itself. In the context of long running servers in fixed locations, this was often an effective approach. As virtualization and container technologies become more prevalent, especially in public cloud, infrastructure focused IT controls… 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
What is Cloud Native?
I hear a lot of people talking about cloud native applications these days. This includes technologists and business managers. I have found that there really is a spectrum of meaning for the term cloud native and that two people rarely mean the same thing when they say cloud native. At one end of the spectrum… Continue reading