DevOps has been defined in this article by Stephen Nelson-Smith, and the executive summary is that operations and development should no longer be separate functions (and never should have been) and need to start working closely together.
Why? Without working together, failures inevitably occur. For example, at the last Boston DevOps Meetup, one of the attendees, a developer, was commenting on the disconnect between him and his sysadmin and how their relationship was unlike the devops model.
“That all sounds nice for you guys, but my sysadmin at work doesn’t seem to care about any of this. He’s not engaged.”
The developer went on to give examples of times when the production servers broke the code because the production servers were configured incorrectly, or the ops person didn’t assist in debugging a problem because the ops person felt the problem was the developer’s to deal with.
We all talked about this for a while, when I realized that in another bar in another town, that developer’s sysadmin was saying to his friends, probably over a beer, “That all sounds nice for you guys, but my developers don’t care about any of this. They’re not engaged.” The sysadmin probably went on to talk about how the developers don’t keep their configurations sane and how they never debug the problems they create.
This is why we need DevOps. (And probably, really, DevOpsQASales, but that’s another post).
How do you get started with DevOps at your work?
- If you are developer, invite your ops guys to your scrum or weekly meeting. Make sure they come and always ask them if what you are talking about has an impact on their work.
- If you are an ops guy, invite your developers to your scrum or weekly meeting. Tell the developers about upcoming changes in each environment. Ask the developers what is going in their world.
If you’re a small team, bring everyone, if you are large, bring one developer from each project, but don’t invite the development managers, or the ops managers. Invite the people who do the work. You need to have the developers who will say, “We’re implementing a feature that uses these extra libraries, can they be installed in production?” and the ops people who will say, “Oh, if you use v2.8 of that library it won’t work on the older machines because of x, can you guys use v2.9?”. You want this to happen before you go to production.
Adding meetings to your calendar always sucks, but you’ll save headache later by talking to each other, and more importantly, you’ll buy into the projects that everyone is working on. You’ll believe in the work others at your company are doing and want to help if there are issues.
The developer above should be talking to his ops guys on a daily basis. They should go for a beer and talk about technical problems at work. I guarantee one of them will say, “Oh for that I just do x y and z, and it works great.” and this will be the solution to a nagging problem.
Technology, of course, can help a lot. In the example above, the ops guy should:
- Create virtual machine images of production on a regular schedule that the developers must run their code on as part of checkin cycle.
- Use a configuration management tool such as puppet or chef to keep staging and QA environments matching production environments.
- Talk to the developers about the network, hardware and software that make up the production environment, including details of the resource limitations of those components.
While the developer should:
- Write up details of the software’s operating requirements in terms of resource usage, environment configuration, and other dependancies.
- Package the software properly, so the ops people can review package manifests on upgrades automatically to track changes in QA and staging.
- Codify operational issues in unit tests (lossy network unit tests, disk full unit tests, out of memory unit tests, blocked port unit tests).
- Use build tools such as Hudson to trigger jobs on checkin – jobs which run the full set of unit tests on a production-like environment/virtual machine.
- Define hand off procedures for new features, which require checkoffs from ops, QA and development.
- Push the ops deployment scripts and methods to the developers’ workstations so the developers can use them.
Also, whenever possible you should automated that which can be automated. That’s what computers are really good at.
These are just a few examples. There’s a lot to talk about in later posts, such as more detail on the heavy use of automation, Agile practices in operations, proper storage of documentation (version control! plain text formats!) and more.
I hope this is useful introduction to some DevOps concepts as I’ve understood them. Please comment below about your own experiences.