CoreOS is a lightweight Linux operating system designed for clustered deployments providing automation, security, and scalability for your most critical applications. I’ve been playing with CoreOS to replace Debian hosts which run Docker containers on Nousmotards project. CoreOS helps on simplifying bare metal deployment and avoid managing OS upgrade. As I’m still an Ansible lover, I’ve made 2 roles: CoreOS Ansible: Ansible role to deploy pypy to CoreOS to be able to get Ansible prerequisites CoreOS: Ansible CoreOS role to deploy CoreOS on bare metal servers The first one is for installing pypy to run Ansible and the other one to bootstrap CoreOS with Cloudinit or/and Igninition.
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Long time since my last post. This one is not very technical post, but it’s a nice to have solution if you use grep usually. Are not you fed up to type vim and search the line after a grep command ? If yes, this post is for you. First of all, you may know that an alternative more user friendly to grep exist, called ag (perf comparison). I really like ag and grep, but something make me loose my time since several years and I’m pretty sure it’s your case too.
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Some of you may not be familiar with the terms “Rolling upgrade” or “Rolling restart”. This is the action of upgrading or restarting a cluster without service interruption (alias zero downtime). In most cases, this is done node by node, but in fact it depends of the technology you’re managing and the number of active nodes in your cluster. At Nousmotards we have several Java Spring Boot applications running. Restarting one application can take up to 1 min.
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  In my previous post, I talked about how to speed up reads and writes coupling Redis with Neo4J. Now I want to share with you how it’s possible to unload your server and use Elasticsearch to speed up news feed and user wall. 1/ Show me your news feed A news feed is the main page of traditional social networks. Its main goal is to show you all recents updates from your friends and your interests.
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Neo4J is the most popular graph database in the NoSQL databases family. We’re using it in the Nousmotards project to store all social data through nodes and relationships. Today I am going to talk about our experience after having using it for 2 years now (take a look at directed graph if you are not really familiar with Graph Database). 1/ Our use case Nousmotards is a social network for bikers, we aim to provide valuable tools to ride, meet and share nice time with people who like motorcycling.
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This title can sounds like a troll, but this is not the case! I’m writing this post as a feedback. When I spoke during an Ansible meetup presenting Nousmotards infrastructure, I had several questions regarding why I chose monit as the init system instead of supervisord. That’s what encouraged me to write this post and that’s why I wanted to clarify here the things. Introduction Docker is made to run a process in a confined area.
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I’m using Graphite at work and for my Nousmotards project. For Nousmotards, I’m using the Graphite version available in the default Debian Jessie repositories. This to avoid mismatch django dependencies etc… A few days ago, I wanted to try Graphite events to get something pretty cool in Grafana : This to be able to know when a new app version is deployed and make it easier to understand when an issue occurs.
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