Posts on dobriak::blog

Autoscaling Reporter

Mon, 30 Apr 2018 09:39:03 -0700

I frequently get asked about utilizing AWS CloudWatch metrics collecting abilities to autoscale DC/OS EE clusters. Usually people figure out quickly how to use the AWS built in metrics (for example CPU utilization) but are not completely sure how they can start emitting their own, custom ones and use those instead.

In this article, I will help you set up a simple Marathon app that will do just that for us: forward some DC/OS built-in metrics and even create and push a custom one.

DC/OS Service Accounts in Restricted Environments

Sun, 29 Apr 2018 15:44:45 -0700

We are so used to having handy little pieces of software that help us do our jobs better. If you too work in the DevOps world and write automation for infrastructure or software (or pretty much anything else) you know what I mean. Take jq for an example: can you imagine writing any sort of shell script that interacts with any JSON producing API and NOT using good ole trustworthy jq?

Run Adhoc Tasks on DC/OS

Sun, 28 Jan 2018 20:46:39 -0700

DC/OS can run Marathon or Kubernetes for orchestrating long running tasks and Metronome / Chronos for scheduled ones. That leaves space for a mechanism to run ad-hoc tasks that do not need to be treated as long running nor scheduled ones.

Secure Kafka Install on DC/OS

Sat, 27 Jan 2018 12:34:45 -0700

Apache Kafka is a distributed high-throughput publish-subscribe messaging system with strong ordering guarantees. Kafka clusters are highly available, fault tolerant, and very durable. DC/OS offers a single click install of Kafka as a framework which is great for trying out. When it comes to actually using it in a Dev/Test/Production environment, you should definitely consider securing your Kafka installation. You will be required to do so if you are running your DC/OS EE cluster in strict mode.

Create VPN Tunnel to your DC/OS Cluster

Thu, 25 Jan 2018 17:56:03 -0700

A frequently asked question is how one can connect their client machine to a DC/OS cluster in such a way that the internal cluster network is locally addressable.

Install Kubernetes on DC/OS (beta)

Sat, 28 Oct 2017 18:13:41 -0700

My employer recently announced first class support for running Kubernetes on top of DC/OS version 1.10. In this post we will examine how to get started with using Kubernetes on DC/OS.

DC/OS on KVM CoreOS VMs

Sat, 28 Oct 2017 13:29:29 -0700

In this article we will automate the DC/OS installation procedure specifically for CoreOS VMs running on KVM (libvirt).

Getting Started with Apache Cassandra On DC/OS

Fri, 28 Jul 2017 08:09:49 -0700

Apache Cassandra is a distributed, structured storage system. Cassandra clusters are highly available, scalable, performant, and fault tolerant. DC/OS allows you to quickly configure, install, and manage Apache Cassandra clusters, so you can offer Cassandra as a managed service to your organization.

IP per Container with Calico CNI on DC/OS

Tue, 18 Jul 2017 22:00:33 -0700

Project Calico is a Layer 3 software defined network that runs well on DC/OS and Mesos. In this blog post we will walk through installing and configuring it on DC/OS 1.9. That will allow us to attach containers to Calico and receive unique IPs for them. We will also examine the security implications and policies that can be applied.

Compiling Local DC/OS Universe

Sat, 27 May 2017 00:51:14 -0700

DC/OS offers its users the ability to install various frameworks with a single click from a central publicly hosted package repository called Universe.

Many Mesosphere clients run their DC/OS clusters in air-gapped environments with no access to the internet, thus not allowing for said one click installation of framework packages.

You can easily solve this problem if your DC/OS cluster is running in such a restricted environment.

Automating advanced DC/OS installation.

Thu, 27 Apr 2017 20:23:50 -0700

In this article we will look at automating the advanced DC/OS installation procedure. We will break down the requirements and look for opportunities to speed up the lengthy installation.

Using Jenkins with a private Docker registry on DC/OS

Tue, 25 Apr 2017 22:05:07 -0700

In this guide I will walk you through setting up your Jenkins instance to use the private docker registry we set up in the previous blog post.

Secure private Docker registry on DC/OS

Mon, 24 Apr 2017 16:45:12 -0700

This is a short guide on how to set up a private docker registry behind an internal marathon-lb instance all running on DC/OS. Since marathon-lb is a Layer 7 load balancer we will use it to terminate SSL for our private registry and avoid using it in insecure mode. We will use self-signed TLS certificates for that purpose.