Tag Archives: devops

Top questions to ask a devops expert when hiring or preparing for job & interview

xkcd_goodcode
Strip by Randall Munroe; xkcd.com

Whether your a hiring manager, head of HR or recruiter, you are probably looking for a devops expert. These days good ones are not easy to find. The spectrum of tools & technologies is broad. To manage today’s cloud you need a generalist.

Join 33,000 others and follow Sean Hull on twitter @hullsean.

If you’re a devops expert and looking for a job, these are also some essential questions you should have in your pocket. Be able to elaborate on these high level concepts as they’re crucial in todays agile startups.

Check out: 8 questions to ask an aws ec2 expert

Also new: Top questions to ask on a devops expert interview

And: How to hire a developer that doesn’t suck

1. How do you automate deployments?

A. Get your code in version control (git)

Believe it or not there are small 1 person teams that haven’t done this. But even with those, there’s real benefit. Get on it!

B. Evolve to one script push-button deploy (script)

If deploying new code involves a lot of manual steps, move file here, set config there, set variable, setup S3 bucket, etc, then start scripting. That midnight deploy process should be one master script which includes all the logic.

It’s a process to get there, but keep the goal in sight.

C. Build confidence over many iterations (team process & agile)

As you continue to deploy manually with a master script, you’ll iron out more details, contingencies, and problems. Over time You’ll gain confidence that the script does the job.

D. Employ continuous integration Tools to formalize process (CircleCI, Jenkins)

Now that you’ve formalized your deploy in code, putting these CI tools to use becomes easier. Because they’re custom built for you at this stage!

E. 10 deploys per day (long term goal)

Your longer term goal is 10 deploys a day. After you’ve automated tests, team confidence will grow around developers being able to deploy to production. On smaller teams of 1-5 people this may still be only 10 deploys per week, but still a useful benchmark.

Also: Top serverless interview questions for hiring aws lambda experts

2. What is microservices?

Microservices is about two-pizza teams. Small enough that there’s little beaurocracy. Able to be agile, focus on one business function. Iterate quickly without logjams with other business teams & functions.

Microservices interact with each other through APIs, deploy their own components, and use their own isolated data stores.

Function as a service, Amazon Lambda, or serverless computing enables microservices in a huge way.

Related: Which engineering roles are in greatest demand?

3. What is serverless computing?

Serverless computing is a model where servers & infrastructure do not need to be formalized. Only the code is deployed, and the platform, AWS Lambda for example, takes care of instant provisioning of containers & VMs when the code gets called.

Events within the cloud environment, such a file added to S3 bucket, trigger the serverless functions. API Gateway endpoints can also trigger the functions to run.

Authentication services are used for user login & identity management such as Auth0 or Amazon Cognito. The backend data store could be Dynamodb or Google’s Firebase for example.

Read: Can on-demand consulting save startups time & money?

4. What is containerization?

Containers are like faster deploying VMs. They have all the advantages of an image or snapshot of a server. Why is this useful? Because you can containerize your microservices, so each one does one thing. One has a webserver, with specific version of xyz.

Containers can also help with legacy applications, as you isolate older versions & dependencies that those applications still rely on.

Containers enable developers to setup environments quickly, and be more agile.

Also: 30 questions to ask a serverless fanboy

5. What is CloudFormation?

CloudFormation, formalizes all of your cloud infrastructure into json files. Want to add an IAM user, S3 bucket, rds database, or EC2 server? Want to configure a VPC, subnet or access control list? All these things can be formalized into cloudformation files.

Once you’ve started down this road, you can checkin your infrastructure definitions into version control, and manage them just like you manage all your other code. Want to do unit tests? Have at it. Now you can test & deploy with more confidence.

Terraform is an extension of CloudFormation with even more power built in.

Also: What can startups learn from the DYN DNS outage?

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Key lessons from the Devops Handbook

I picked up a copy of the DevOps Handbook.

This is not a book about how to setup Amazon servers, how to use git, codePipeline or Jenkins. It’s not about Chef or Ansible or other tools.

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This is a book about processes & people. It’s about how & why automation & world-class infrastructure will make your business more agile, raise quality & increase productivity.

1. Infrastructure in version control

With technologies like Terraform and CloudFormation, the entire state of your infrastructure can be captured. That means you can manage it just like any other code.

Also: Myth of five nines – Why high availability is overrated

2. Pushbutton builds

You’ve heard it before. Automate your builds. That means putting everything in version control, from environment building scripts, to configs, artifacts & reference data. Once you can do that, you’re on your way to automating production deploys completely.

Related: 5 ways to move data to amazon redshift

3. Devs & Ops comingled

In the devops world, devs should learn about operations, infrastructure, performance & more. What’s more operations teams should work closely with devs.

Read: Why were dev & ops siloed job roles?

4. Servers as cattle not pets

In the old days, we logged into servers & provided personal care & feeding. We treated them like pets.

In the new world of devops, we should treat servers like cattle. When it begins to fail, take it out back and shoot it. (tbh i don’t love the analogy, but it carries some meaning…)

Also: Are SQL databases dead?

5. Open to learnings & failures

Organizations that are open to failures, without playing the blame game, learn quicker & recover from problems faster.

Also: Is Amazon too big to fail?

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30 questions to ask a serverless fanboy

Everyone is hot under the collar again. So-called serverless or no-ops services are popping up everywhere allowing you to deploy “just code” into the cloud. Not only won’t you have to login to a server, you won’t even have to know they’re there.

As your code is called, but cloud events such a file upload, or hitting an http endpoint, your code runs. Behind the scene through the magic of containers & autoscaling, Amazon & others are able to provision in milliseconds.

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Pretty cool. Yes even as it outsources the operations role to invisible teams behind Amazon Lambda, Google Cloud Functions or Webtask it’s also making companies more agile, and allowing startup innovation to happen even faster.

Believe it or not I’m a fan too.

That said I thought it would be fun to poke a hole in the bubble, and throw some criticisms at the technology. I mean going serverless today is still bleeding edge, and everyone isn’t cut out to be a pioneer!

With that, here’s 30 questions to throw on the serverless fanboys (and ladies!)…

1. Security

o Are you comfortable removing the barrier around your database?
o With more services, there is more surface area. How do you prevent malicious code?
o How do you know your vendor is doing security right?
o How transparent is your vendor about vulnerabilities?

Also: Myth of five nines – Why high availability is overrated

2. Testing

o How do you do integration testing with multiple vendor service components?
o How do you test your API Gateway configurations?
o Is there a way to version control changes to API Gateway configs?
o Can Terraform or CloudFormation help with this?
o How do you do load testing with a third party db backend?
o Are your QA tests hitting the prod backend db?
o Can you easily create & destroy test dbs?

Related: 5 ways to move data to amazon redshift

3. Management

o How do you do zero downtime deployments with Lambda?
o Is there a way to deploy functions in groups, all at once?
o How do you manage vendor lock-in at the monitoring & tools level but also code & services?
o How do you mitigate your vendors maintenance? Downtime? Upgrades?
o How do you plan for move to alternate vendor? Database import & export may not be ideal, plus code & infrastructure would need to be duplicated.
o How do you manage a third party service for authentication? What are the pros & cons there?
o What are the pros & cons of using a service-based backend database?
o How do you manage redundancy of code when every client needs to talk to backend db?

Read: Why were dev & ops siloed job roles?

4. Monitoring & debugging

o How do you build a third-party monitoring tool? Where are the APIs?
o When you’re down, is it your app or a system-wide problem?
o Where is the New Relic for Lambda?
o How do you degrade gracefully when using multiple vendors?
o How do you monitor execution duration so your function doesn’t fail unexpectedly?
o How do you monitor your account wide limits so dev deploy doesn’t take down production?

Also: Are SQL databases dead?

5. Performance

o How do you handle startup latency?
o How do you optimize code for mobile?
o Does battery life preclude a large codebase on client?
o How do you do caching on server when each invocation resets everything?
o How do you do database connection pooling?

Also: Is Amazon too big to fail?

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How do we lock down cloud systems from disgruntled engineers?

CommitStrip.com

I worked at a customer last year, on a short term assignment. A brilliant engineer had built their infrastructure, automated deployments, and managed all the systems. Sadly despite all the sleepless nights, and dedication, they hadn’t managed to build up good report with management.

Join 32,000 others and follow Sean Hull on twitter @hullsean.

I’ve seen this happen so many times, and I do find it a bit sad. Here’s an engineer who’s working his butt off, really wants the company to succeed. Really cares about the systems. But doesn’t connect well with people, often is dismissive, disrespectful or talks down to people like they’re stupid. All of this burns bridges, and there’s a lot of bad feelings between all parties.

How do you manage the exit process? Here’s a battery of recommendations for changing credentials & logins so that systems can’t be accessed anymore.

1. Lock out API access

You can do this by removing the administrator role or any other role their IAM user might have. That way you keep the account around *just in case*. This will also prevent them from doing anything on the console, but you can see if they attempt any logins.

Also: Is AWS too complex for small dev teams?

2. Lock out of servers

They may have the private keys for various serves in your environment. So to lock them out, scan through all the security groups, and make sure their whitelisted IPs are gone.

Are you using a bastion box for access? That’s ideal because then you only have one accesspoint. Eliminate their login and audit access there. Then you’ve covered your bases.

Related: Does Amazon eat it’s own dogfood?

3. Update deployment keys

At one of my customers the outgoing op had setup many moving parts & automated & orchestrated all the deployment processes beautifully. However he also used his personal github key inside jenkins. So when it went to deploy, it used those credentials to get the code from github. Oops.

We ended up creating a company github account, then updating jenkins with those credentials. There were of course other places in the capistrano bits that also needed to be reviewed.

Read: Is aws a patient that needs constant medication?

4. Update dashboard logins

Monitoring with NewRelic or Nagios? Perhaps you have a centralized dashboard for your internal apps? Or you’re using Slack?

Also: Is Amazon too big to fail?

5. Audit Non-key based logins

Have some servers outside of AWS in a traditional datacenter? Or even servers in AWS that are using usernames & passwords? Be sure to audit the full list of systems, and change passwords or disable accounts for the outgoing sysop.

Also: When hosting data on Amazon turns bloodsport?

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Are career promotions like marriage… appealing until your first divorce?

surge pricing engineers

I was recently flipping through an interesting email list. It’s focused for tech leaders, managers & startup entrepreneurs. An HR team lead posted asking about “promotion paths” for engineers.

While I have an intuitive grasp of what engineers at those different levels look like, I’m having trouble making those concrete.

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It struck me how antiquated the whole “career ladder” concept is. Work one job for 20-30 years. It feels like the fairytale of dating that leads safely to marriage. It all seems like a wonderful plan until it fizzles out, employees get jaded, they start seeing the real money being paid elsewhere, and begin looking around.

1. Talent in short supply

I’m not a CTO.  I should preface with that bit.  I’m a consultant.  That said I’ve worked in the tech industry for 20 years, so I have a bit of an opinion here.

Going to meetups, startup industry & pitch events. They’re all like a feeding frenzy. There are more companies hiring now than I remember back in 1998 & 1999. It’s just crazy.

Angel List says 18,000 companies are hiring right now. What about Made In NYC? That shows 735 jobs. And of course there’s Ycombinator who is hiring April 2016, which posts every other month. It has 720 comments as of this writing.

Also: Why I don’t work with recruiters

2. Are salary jumps always larger through external promotion?

I’ve seen a pattern repeated over & over.  An outside firm offers more money & grabs the talent, or the talent gets restless, starts looking & finds they get a bigger bump in salary by leaving, than by internal promotions.  

I don’t know why this is, but it seems almost universal that salary jumps are larger from outside firms, than internally through promotion.  

Also: Why devops talent is so hard to find

3. Building a better ladder

There are great posts on engineering ladders like this one from Neo and also this one from RTR. Also take a look at this one at Artsy. And of course somebody has to go and put theirs up on github. 🙂

All the titles & internal shuffling in the world aren’t going to hide industry pay for long.  When an employee gets wise to their career & the skills marketplace, they’ll eventually learn that title does not equal compensation.

Related: How to hire a developer that doesn’t suck?

4. Building a better culture

In a pricey city like New York, the only thing that seems a counterweight to this is phenomenal culture, chance to build something cool & be surrounded by coworkers you love.  To be sure bouncing around you get less of this. Companies like Etsy comes to mind. According to glassdoor companies like Airbnb, Hubspot & facebook also fit the bill.

Read: 8 questions to ask an aws expert

5. Surge pricing for engineers?

Alternatively to better ladders & promotions, perhaps what Uber did for taxi driving would make sense for hiring engineers too. Let the freelancing phenomenon grow even bigger!

Perhaps we need surge pricing for engineers. That way the very best really do get rewarded the most. Let the marketplace work it’s magic.

Also: When you have to take the fall

Get more. Grab our exclusive monthly Scalable Startups. We share tips and special content. Our latest Why I don’t work with recruiters

Locking down cloud systems from disgruntled engineers

medieval gate fortified aws

I worked at a customer last year, on a short term assignment. A brilliant engineer had built their infrastructure, automated deployments, and managed all the systems. Sadly despite all the sleepless nights, and dedication, they hadn’t managed to build up good report with management.

Join 32,000 others and follow Sean Hull on twitter @hullsean.

I’ve seen this happen so many times, and I do find it a bit sad. Here’s an engineer who’s working his butt off, really wants the company to succeed. Really cares about the systems. But doesn’t connect well with people, often is dismissive, disrespectful or talks down to people like they’re stupid. All burns bridges, and there’s a lot of bad feelings between all parties.

How to manage the exit process. Here’s a battery of recommendations for changing credentials & logins so that systems can’t be accessed anymore.

1. Lock out API access

You can do this by removing the administrator role or any other role their IAM user might have. That way you keep the account around *just in case*. This will also prevent them from doing anything on the console, but you can see if they attempt any logins.

Also: Is AWS too complex for small dev teams?

2. Lock out of servers

They may have the private keys for various serves in your environment. So to lock them out, scan through all the security groups, and make sure their whitelisted IPs are gone.

Are you using a bastion box for access? That’s ideal because then you only have one accesspoint. Eliminate their login and audit access there. Then you’ve covered your bases.

Related: Does Amazon eat it’s own dogfood?

3. Update deployment keys

At one of my customers the outgoing op had setup many moving parts & automated & orchestrated all the deployment processes beautifully. However he also used his personal github key inside jenkins. So when it went to deploy, it used those credentials to get the code from github. Oops.

We ended up creating a company github account, then updating jenkins with those credentials. There were of course other places in the capistrano bits that also needed to be reviewed.

Read: Is aws a patient that needs constant medication?

4. Dashboard logins

Monitoring with NewRelic or Nagios? Perhaps you have a centralized dashboard for your internal apps? Or you’re using Slack?

Also: Is Amazon too big to fail?

5. Non-key based logins

Have some servers outside of AWS in a traditional datacenter? Or even servers in AWS that are using usernames & passwords? Be sure to audit the full list of systems, and change passwords or disable accounts for the outgoing sysop.

Also: When hosting data on Amazon turns bloodsport?

Get more. Grab our exclusive monthly Scalable Startups. We share tips and special content. Our latest Why I don’t work with recruiters

Is AWS too complex for small dev teams & startups?

via GIPHY

I was discussing a server outage with a colleague recently. AWS had done some confusing things, and the team was rallying to troublehsoot & fix.

He made an offhand comment that caught my attention…


AWS is too complex for small dev teams. I’d recommend we host in a traditional datacenter.

Join 32,000 others and follow Sean Hull on twitter @hullsean.

It’s an interesting point. For all the fanfare over Amazon, lost in the shuffle is the staggering complexity that we’re taking on. For small firms, this is a cost that’s often forgotten when we smell the on-demand cool-aid that is EC2.

Here are my thoughts…

1. Over 70 services offered

Everytime I login to the AWS console there’s a new service offering. Lambda & serverless computing. CodeDeploy, Redshift, EMR, VPC’s, developer tools, IOT, the list goes on. If you haven’t enabled MFA on your IAM accounts you’re not alone!

Also: Is Amazon too big to fail?

2. Still complex to build high availability

The song I hear out of Amazon is, we offer all the components for a high availability infrastructure. multiple availability zones, regions, load balancers, autoscaling, geo & latency dns routing. What’s more companies like Netflix have open sourced tools to help.

But at a lot of startups that I see, all these components are not in use, nor are they well understood. Many admins are still using Amazon like an old-school datacenter. And that’s not good.

Sometimes it seems that AWS is a patient in need of constant medication.

Related: Are we fast approaching cloud-mageddon?

3. Need a dedicated devops

As AWS becomes more complex, and the offering more robust, so too the need for dedicated ops. If you’re devs are already out of bandwidth, but you don’t quite have so much need for a fulltime resource a consultant may be an option. Round out the team & keep costs manageable.

If you’re looking for an aws solutions architect, we can help!

Check out: Does Amazon eat it’s own dogfood?

4. Orchestration involves many moving parts

Infrastructure as code offers the promise of completely versioning all your servers, configurations and changes. From there we can apply test driven development & bring a more professional level of service to our business. That’s the theory anyway.

In practice it brings an incredible number of new toolsets to master and a more complex stack besides. All those components can have bugs, need troubleshooting. This sometimes just kicks the can down the road, moving the complexity elsewhere.

It’s not clear that for smaller shops, all this complexity is manageable.

Also: 5 things toxic to scalability

5. Troubleshooting failed deployments

I was looking at a problem with a broken deploy recently. Turns out a developer had copy & pasted some code solution off the internet, possibly from a tutorial, and broke deployments to staging.

Yes perhaps this was avoidable, and more checks & balances can fix. But my thought is continuous integration & continuous deployments are not a panacea. More complexity brings a more complex web to unweave.

I sometimes wonder if we aren’t fast approaching cloud-mageddon?

Read: Why Airbnb didn’t have to fail?

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Why you need a performance dashboard like StackExchange

stackexchange

Most startups talk about performance crucial. But often with all the other pressing business demands, it can be forgotten until it becomes a real problem.

Flipping through High Scalability today, I found a post about Stack Exchange’s performance dashboard.

Join 28,000 others and follow Sean Hull on twitter @hullsean.

The dashboard for Stack Exchange performance is truly a tectonic shift. They have done a tremendous job with the design, to make this all visually appealing.

But to focus just on the visual aesthetics would be to miss many of the other impacts to the business.

1. Highlight reliability to the business

Many dashboards, from Cacti to New Relic present performance data. But they’re also quite technical and complicated to understand. This inhibits their usefulness across the business.

The dashboard at Stack Exchange boils performance down to the essentials. What customers are viewing, how quickly the site is serving them, and where bottlenecks are if any.

Also: Is the difference between dev & ops a four-letter word?

2. What’s our architecture?

Another thing their dashboard does is illustrate their infrastructure clearly.

I can’t count the number of startups I’ve worked at where there are extra services running, odd side utility boxes performing tasks, and general disorganization. In some cases engineering can’t tall you what one service or server does.

By outlining the architecture here, they create a living network diagram that everyone benefits from.

Related: Is automation killing old-school operations?

3. Because Fred Wilson says so

If you’re not convinced by what google says, consider Fred Wilson who surely should know. He says speed is an essential feature. In fact *the* essential feature.

The 10 Golden Principles of Successful Web Apps from Carsonified on Vimeo.

Read: Do managers underestimate operational cost?

4. Focus on page loading times!

If you scroll to the very bottom of the dashboard, you have two metrics. Homepage load time, and their “questions” page. The homepage is a metric everyone can look at, as many customers will arrive at your site though this portal. The questions page will be different for everyone. But there will be some essential page or business process that it highlights.

By sifting down to just these two metrics, we focus on what’s most important. All of this computing power, all these servers & networks are all working together to bring the fastest page load times possible!

Also: Is the difference between dev & ops a four-letter word?

5. Expose reliability to the customer

This performance page doesn’t just face the business. It also faces the customers. It lets them know how important speed is, and can underscore how serious the business takes it’s customers. Having an outage or a spike that’s slowing you down. Customers have some transparency into what’s happening.

Also: Is the difference between dev & ops a four-letter word?

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Best of Startup Content on Scalable Startups

strawberries

Join 28,000 others and follow Sean Hull on twitter @hullsean.

Costs

Costs of techops can involve short-term architectural, decisions, but what about the longer term affects of choices? Do cto’s underestimate operational costs?

A stack of…

These days the full stack of a internet or mobile startup involves a lot of varied components, from Chef, Puppet & Ansible, to Nginx, haproxy, redis, solr and some database like MySQL or Postgres on the relational end of the spectrum, or Mongodb, Hbase or Cassandra on the NoSQL side. What type of challenges does this pose to a team? I’m curious,
Do startups assemble at their own risk?

Most used tech

Leo Polovets ran some stats over the Angellist data of startups. He wanted to know Which tech do startups use most? and I summarized the results.

Death of ops?

These days with all the talk of automation, I’ve heard heard developers & even CTO’s argue of a diminishing need for backend administrators. Do startups still need techops?

Speed as a feature

Is Fred Wilson right to say speed is a feature? What does this mean for those migrating or already running in the cloud? How does scalability come into play?

Avoiding outages

Are many outages avoidable? Did Airbnb have to fail?

Performance Review

Reviewing architecture & site speed is a type of engagement that a lot of startups can benefit from. Here’s my Anatomy of a performance review.

Let things fail

Does it sometimes make sense to let things break a little? A tale of managed failure.

Young founders

I worked at one startup with a CTO just out of college. Although they were flush with cash & had real problems scaling, communication problems ultimately soured the engagement. Are you too young to be a boss?

80 million fix

Sometimes fixing serious performance bottlenecks can get a site back up on it’s feet. In this success story they went on to get acquired weeks after the fix. In tongue in cheek fashion I askWhere’s my 80 million dollars?

CTO’s should never do

There are times to get into the trenches. But what if it sacrifices leadership?What should a CTO never do?

Startups too cool for school

Joining YC but have no ideas? No problem. Is my startup too cool for your business school?

Instant business, just add water

Can a business be built in just a weekend? Is there a problem with startup bootcamps?

Get more. Grab our exclusive monthly Scalable Startups. We share tips and special content. Our latest Why I don’t work with recruiters

5 Things I just learned from James Turnbull about Docker

docker containers

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I just got my hands on a copy of James Turnbull’s new book The Docker Book. It’s an excellent introduction to Linux containers & the powerful things you can do with them. It’s 335 pages covering all the introductory topics to get you up and running and then more advanced topics like working with the docker API, building services & extending docker.

Here’s what I learned…

1. Containers aren’t new

The technology today we call containers in Unix is based on chroot mechanism which was introduced way back in the 80’s.

With traditional virtualization, we use a hypervisor layer, so we emulate hardware. The virtual machine running on top, can run anything, from Windows, to different flavors & versions of unix. It appears to be a completely separate piece of hardware.

With containers we move up to the operating system level, and we create isolation between users. These users all share the same parent operating system. This means it requires dramatically less overhead. That means speed!

Docker is an automation layer built on Lightweight Linux Containers or LXC. To applications it looks like they have their own machine, their own userspace, their own filesystem, their own network.

Also: Is Apple betting against big data?

2. No more VirtualBoxes

Are you tired of waiting for your VMs to spinup? Building dev & test environments becomes lightening fast with Docker. This accelerates software development, and makes a lot of things easier.

Also: When prospects mislead

3. Images, registries & containers

Images share some of the properties of images in hypervisor virtualization. However they are implemented with union file systems. While VirtualBox images take some time to boot, as the entire filesystem must be read & code executed anew, docker images are more like source code to the LXC subsystem.

Registries store your public and private images. The Docker Hub is one popular one. You can also host & deploy your own docker registry as your needs dictate.

Like VMs, containers can be started & stopped at will, albeit at lightening fast speed. They can also be deleted much as a VM can be.

Also: What can new york fashion week teach Chad Dickerson about Net Neutrality?

4. Lightning fast sandboxes

As we mentioned containers are fast. Did we mention really fast?

This can facilitate unit testing & continuous integration. A lot of shops are starting to use Jenkins for continuous integration, and fast testing is key to this process.

Also: Is automation killing old-school technical operations?

5. They work with Vagrant

Are you already using Vagrant to automate deployment of virtual environments. If so the transition is easy. Here Docker becomes your provisioner.

Mark Stratmann put together a great how to, Implementing a Vagrant / Docker Dev environment which we’d recommend you take a look at. You can also head over to the Vagrant docs themselves.

Also: Which tech do startups use most?

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