Atomic

atomicapp is a reference implementation of the Nulecule Specification. It can be used to bootstrap container applications and to install and run them. atomicapp is designed to be run in a container context. Examples using this tool may be found in the Nulecule library. If you want to know the internals of atomicapp, how it works, etc., or contribute to it’s development, this post is for you. Setup Install python virtualenv utils virtualenv is a tool to create isolated Python environments....

It’s easier to explain things with an example. So, I will take up centos/postgresql docker image and nuleculize it for Docker and Kubernetes as providers. This post assumes that you have setup an Atomic environment on CentOS7/Fedora. If you have not done so, you can follow the instructions here. First, we’ll create scaffolding for our Nulecule PostgreSQL application. mkdir -p nulecule-postgresql/artifacts/{docker,kubernetes} touch nulecule-postgresql/{Dockerfile,LICENSE,Nulecule,README.md} touch nulecule-postgresql/docker/postgresql-app-pod_run touch nulecule-postgresql/kubernetes/{postgresql-pod,postgresql-service}.yaml Second, we’ll edit nulecule-postgresql/Nulecule file as below:...

This post will run you through how to setup an environment Atomic apps on CentOS 7, by hand. For quickstart, you can just run the Vagrantfile at here. Setup Install dependencies # yum install docker atomic kubernetes etcd Configure docker storage pool Assuming that you have a new volume: /dev/vdb attached to your machine, configure /etc/sysconfig/docker-storage-setup as below: # cat <<EOF > /etc/sysconfig/docker-storage-setup DEVS=/dev/vdb VG=docker-vg EOF Start and enable Docker # systemctl start docker # systemctl enable docker You can run # docker info to check the new specs for docker storage pool....