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Operations: a developer's guide

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annashipman
annashipman

Slides from my http://2015.ffconf.org/ talk. Links on the last page: Configuration management https://www.scriptrock.com/articles/the-7-configuration-management-tools-you-need-to-know http://gettingstartedwithchef.com/first-steps-with-chef.html https://docs.vagrantup.com/v2/getting-started/provisioning.html Virtualisation http://searchvirtualdatacentre.techtarget.co.uk/definition/Virtualisation http://searchservervirtualization.techtarget.com/definition/server-virtualization http://www.infoworld.com/article/2621446/server-virtualization/server-virtualization-top-10-benefits-of-server-virtualization.html Using Vagrant https://www.vagrantup.com/ http://blog.bennycornelissen.nl/otto-a-modern-developers-new-best-friend/ https://github.com/patrickdlee/vagrant-examples (Useful getting started examples) Docker http://patg.net/containers,virtualization,docker/2014/06/05/docker-intro/ https://zeltser.com/security-risks-and-benefits-of-docker-application/ Containerisation vs Virtualisation http://www.slideshare.net/bcantrill/docker-and-the-future-of-containers-in-production https://www.scriptrock.com/articles/docker-vs-vagrant Make instead of Grunt/Gulp http://blog.keithcirkel.co.uk/why-we-should-stop-using-grunt/ https://www.youtube.com/watch?v=0RYETb9YVrk (Talk on using NPM as a build tool) https://blog.jcoglan.com/2014/02/05/building-javascript-projects-with-make/ Tools for better dev http://www.leancrew.com/all-this/2011/12/more-shell-less-egg/ (More detail on the 6-line Unix program)

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Operations: a developer’s guide Anna Shipman @annashipman
@annashipman Technical architect at the Government Digital Service
@annashipman My background
@annashipman Previous career in publishing
@annashipman Self taught programmer: HTML, CSS, terrible JS
@annashipman First employed gig, 2005: backend, Java
@annashipman First job at GDS, 2012: redirecting URLs
@annashipman
@annashipman Wrote perl to generate nginx config
@annashipman Didn’t understand the emails from the infrastructure team
@annashipman So joined the infrastructure team
@annashipman Which led to where I am now…
@annashipman Technical architect on a large infrastructure project
@annashipman What I learned has made me a better developer
@annashipman Knowing these things might help you
@annashipman Wrangling servers Virtualisation Containerisation Some tools to make you a better developer
@annashipman Each section will have a take-home
@annashipman 1. Wrangling servers
@annashipman How the internet works Wrangling servers
@annashipman “It’s a series of tubes” —Sen. Ted Stevens Wrangling servers
@annashipman Servers Wrangling servers
@annashipman Where are your servers? Wrangling servers
@annashipman Where are your servers? You own them (e.g. in the office) Wrangling servers
@annashipman Where are your servers? You own them (e.g. in the office) Shared hosting (e.g. Dreamhost) Wrangling servers
@annashipman Where are your servers? You own them (e.g. in the office) Shared hosting (e.g. Dreamhost) The cloud (e.g. AWS) Wrangling servers
@annashipman Where are your servers? You own them (e.g. in the office) Shared hosting (e.g. Dreamhost) The cloud (e.g. AWS) PaaS/application hosting (e.g. Heroku) Wrangling servers
@annashipman Where are your servers? You own them (e.g. in the office) Shared hosting (e.g. Dreamhost) The cloud (e.g. AWS) PaaS/application hosting (e.g. Heroku) Something else/don’t know Wrangling servers
@annashipman You need to make sure the server has the software you need Wrangling servers
@annashipman Handcrafting servers Wrangling servers
@annashipman But what happens if your server dies? Wrangling servers
@annashipman It’s also easy to make a mistake Wrangling servers
@annashipman Configuration management Wrangling servers
@annashipman Tools that use configuration you’ve written to build servers Wrangling servers
https://www.getfilecloud.com/blog/2014/08/top-8-configuration-management-tools-for-sys-admins/
@annashipman GOV.UK uses Puppet, my current project uses Ansible Wrangling servers
@annashipman Config management tools automate building your servers Wrangling servers
@annashipman So it is reliable and repeatable Wrangling servers
@annashipman Some getting started guides at the end Wrangling servers
@annashipman If nothing else, just write a script Wrangling servers
@annashipman “Cattle not pets” Wrangling servers
@annashipman You should not be afraid to lose your servers Wrangling servers
@annashipman 2. Virtualisation
@annashipman Creating logical computing resources from available physical resources Virtualisation
@annashipman Virtual machines Virtualisation
@annashipman What’s a hypervisor? Virtualisation
@annashipman Hypervisor is the software that runs the VMs Virtualisation
@annashipman
@annashipman Slight digression into cloud computing Virtualisation
@annashipman “Someone else’s computers” Virtualisation
@annashipman Your servers are in a data centre Virtualisation
@annashipman A layer of abstraction that pools the resources Virtualisation
@annashipman
@annashipman Some advantages of cloud computing Virtualisation
@annashipman Some advantages of cloud computing Increased uptime & disaster recovery Virtualisation
@annashipman Some advantages of cloud computing Increased uptime & disaster recovery Can get a VM straight away Virtualisation
@annashipman Some advantages of cloud computing Increased uptime & disaster recovery Can get a VM straight away Charged for what you use Virtualisation
@annashipman That’s the cloud – now your computer Virtualisation
@annashipman How is virtualisation useful to you? Virtualisation
@annashipman Used to be software = slow, resource-intensive Virtualisation
@annashipman From 2005 Intel & AMD started doing hardware- accelerated virtualisation Virtualisation
@annashipman So can run lots of VMs on your computer Virtualisation
@annashipman Vagrant is a lightweight way to create VMs Virtualisation
@annashipman Vagrant.configure(2) do |config| config.vm.box = "puppetlabs/centos-7.0-64-puppet" config.vm.provider :virtualbox |vb| vb.customize ["modifyvm", :id, "--memory", "2048"] end end Virtualisation
@annashipman Vagrant.configure(2) do |config| config.vm.box = "ubuntu/trusty64" end Virtualisation
@annashipman $ vagrant up Virtualisation
@annashipman $ vagrant ssh Virtualisation
@annashipman $ cd /vagrant Virtualisation
@annashipman Links to documentation and simple examples at the end Virtualisation
@annashipman You can develop locally using the same software as is deployed remotely Virtualisation
@annashipman You can use configuration management to build your VM Virtualisation
@annashipman It makes it easy to collaborate Virtualisation
@annashipman Vagrant makes it easy to get started/pick up where you left off Virtualisation
@annashipman Currently Otto uses Vagrant Virtualisation
@annashipman Vagrant can improve your project tomorrow Virtualisation
@annashipman 3. Containerisation
@annashipman (Docker is not the only containerisation tech) Containerisation
@annashipman Docker is based on Linux Containers 1. Put netting on garlic and put back outside Containerisation
@annashipman 2008: LXC 2004: Solaris zones 2000: BSD jails 1982: chroot (tech based on) Containerisation
@annashipman You can run multiple containers Containerisation
@annashipman Containers are isolated from each other Containerisation
@annashipman Why would you use containers? Containerisation
@annashipman Configuring a VM can be slow Containerisation
@annashipman You might instead decide to take a snapshot Containerisation
@annashipman And that is what you deploy to production Containerisation
@annashipman Containers are immutable Containerisation
@annashipman So you can be sure what you’ve tested is what is running in production Containerisation
@annashipman With all the same dependencies 1. Put netting on garlic and put back outside Containerisation
@annashipman However… Containerisation
@annashipman The immutability can make developing locally difficult Containerisation
@annashipman You can’t run them everywhere Containerisation
@annashipman Possibly a harder concept to grasp Containerisation
@annashipman Right now, it’s not essential that you understand Docker unless you are interested Containerisation
@annashipman 2 + 3: Virtualisation + Containerisation Turtles
@annashipman Locally, it’s Vagrant or Docker Turtles
@annashipman But if you deploy to the cloud… Turtles
@annashipman
@annashipman How do you know where the problem is? Turtles
@annashipman It’s turtles all the way down Turtles
@annashipman BREAK
@annashipman Wrangling servers “Cattle not pets”
@annashipman Virtualisation Use Vagrant
@annashipman Containerisation You don’t need to learn Docker right now
@annashipman 4. Some tools to make you a better developer
@annashipman “Should all my tools be written in JavaScript (warning: if the answer is ‘no’, there might be a revolution!!!)” —Remy Tools
@annashipman Build systems – Grunt, Gulp… Tools
@annashipman Don’t just work out of the box Tools
@annashipman Dependencies and plug-ins Tools
@annashipman You could use NPM Tools
@annashipman Make Tools
@annashipman Can create tasks to do anything: clean, compile, build… Tools
@annashipman Advantages of Make Tools
@annashipman Advantages of Make Dependency tracking and resolution Tools
@annashipman Advantages of Make Dependency tracking and resolution Only does what it needs to Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css Compiles your SCSS to CSS Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css This is what Grunt, Gulp etc are doing Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css $ make styles.css Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css Only runs if SCSS is newer than CSS Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css $ make print.css Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css $ make all Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css $ make all Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css $ make Tools
@annashipman all: styles.css print.css styles.css: styles.scss sass styles.scss:styles.css print.css: print.scss sass print.scss:print.css If print.css doesn’t need updating, only runs styles.css Tools
@annashipman Advantages of Make Dependency tracking and resolution Only does what it needs to Tools
@annashipman Advantages of Make Dependency tracking and resolution Only does what it needs to Included in your OS* *Linux, Unix, MacOS Tools
@annashipman Has everything you need Tools
@annashipman It just isn’t written in JS Tools
@annashipman Unix tools Tools
@annashipman grep Tools
@annashipman grep Search given input files for patterns Tools
@annashipman cat Tools
@annashipman cat Concatenate and print files Tools
@annashipman awk Tools
@annashipman awk Scan input files for patterns; perform action Tools
@annashipman And the most useful: man Tools
@annashipman man format and display manual pages Tools
@annashipman $ man grep Tools
@annashipman $ man man Tools
@annashipman Being unixy Tools
@annashipman Each tool does one thing very well Tools
@annashipman Composable Tools
@annashipman | Tools
@annashipman | (Pipe) Tools
@annashipman Read a file of text, determine the n most frequently used words, and print out a sorted list of those words along with their frequencies. Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman 1 tr -cs A-Za-z 'n' | 2 tr A-Z a-z | 3 sort | 4 uniq -c | 5 sort -rn | 6 sed ${1}q Tools
@annashipman Read a file of text, determine the n most frequently used words, and print out a sorted list of those words along with their frequencies. Tools
@annashipman You might not want to write all your programs in Unix Tools
@annashipman It can be really useful for doing complex tasks Tools
@annashipman It’s worth getting familiar with Unix tools locally Tools
@annashipman So that the first time isn’t when you’re debugging on the server Tools
@annashipman $ rake -T | grep "some detail" Tools
@annashipman Read the output Tools
@annashipman Git instructions Tools
@annashipman $ git add accidental_new_file.txt $ git status On branch master Your branch is up-to-date with 'origin/master'. Changes to be committed: (use "git reset HEAD <file>..." to unstage) new file: accidental_new_file.txt Tools
@annashipman $ git add accidental_new_file.txt $ git status On branch master Your branch is up-to-date with 'origin/master'. Changes to be committed: (use "git reset HEAD <file>..." to unstage) new file: accidental_new_file.txt Tools
@annashipman Unix error messages Tools
@annashipman $ grep -r anna Tools
@annashipman $ grep -r anna grep: warning: recursive search of stdin Tools
@annashipman $ grep -r anna . Tools
@annashipman Unix tools can help you Tools
@annashipman The main three things you should take home:
@annashipman Use Vagrant
@annashipman Unix tools are your friends
@annashipman Read the output
Thank you! Anna Shipman @annashipman
Configuration management https://www.scriptrock.com/articles/the-7-configuration-management-tools-you-need-to-know http://gettingstartedwithchef.com/first-steps-with-chef.html https://docs.vagrantup.com/v2/getting-started/provisioning.html Virtualisation http://searchvirtualdatacentre.techtarget.co.uk/definition/Virtualisation http://searchservervirtualization.techtarget.com/definition/server-virtualization http://www.infoworld.com/article/2621446/server-virtualization/server-virtualization-top-10-benefits-of-server- virtualization.html Using Vagrant https://www.vagrantup.com/ http://blog.bennycornelissen.nl/otto-a-modern-developers-new-best-friend/ https://github.com/patrickdlee/vagrant-examples (Useful getting started examples) Docker http://patg.net/containers,virtualization,docker/2014/06/05/docker-intro/ https://zeltser.com/security-risks-and-benefits-of-docker-application/ Containerisation vs Virtualisation http://www.slideshare.net/bcantrill/docker-and-the-future-of-containers-in-production https://www.scriptrock.com/articles/docker-vs-vagrant Make instead of Grunt/Gulp http://blog.keithcirkel.co.uk/why-we-should-stop-using-grunt/ https://www.youtube.com/watch?v=0RYETb9YVrk (Talk on using NPM as a build tool) https://blog.jcoglan.com/2014/02/05/building-javascript-projects-with-make/ Tools for better dev http://www.leancrew.com/all-this/2011/12/more-shell-less-egg/ (More detail on the 6-line Unix program)

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