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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Hi all ! Long time since last blog post ! I’m using Jenkins with Ansible on my Nousmotards project for building docker containers or deploying into production. You may noticed that you’ve no Ansible color when running it into Jenkins! The simple way to correct it is to export an environment variable in your Jenkins job: export ANSIBLE_FORCE_COLOR=true Now that’s pretty cool! However, you may also noticed that there’s some kind of lags on the console when you want to see a real time console log on Jenkins.
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The Ansible meetup ended ! That was really nice for my first one. I had really great feedbacks and liked the questions when ended. More than that I met nice people after the meetup and could have interresting discussions :-). I’m really happy about it. For those who would like to review the slides, you can find them here: http://nousmotards.github.io/ansible-meetup-0915/ If you want to watch the video: http://www.infoq.com/fr/presentations/reseau-social-motard or view the PDF version here:
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Author's picture

Pierre Mavro / Deimosfr


SRE Lead DevOps at Criteo  •  Nousmotards Co-Founder

Paris - France