Install & Using Docker (OSX, CoreOS, Docker-CM, Alpine Linux, Docker-Compose)

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I recently decided to consolidate some of my websites onto one server. I also wanted to https (SSL) most if not all my websites. Before I would use CentOS or Ubuntu and Nginx as a reverse proxy with Nginx/Passenger serving my Rails apps and Apache/PHP serving my WordPress/PHP sites. Here’s how I installed docker, docker-cm and started using containers on my production servers.

I’ve known about Docker and I’ve used it indirectly, a Rails app i worked on used it in production but it was abstracted from us software engineers. So I installed Docker-CM on both CentOS, Ubuntu, and Docker on OSX to experiment.

OSX: https://docs.docker.com/docker-for-mac/install/

 

After spinning up some containers and learning some Docker commands.

Docker Commands

 

I started to research minimalist Linux distros for the host OS. I only need to be able to run Docker-CM, maybe a firewall, and some other minimal software on it because the heavy lifting would be done in each of the containers. While doing that I learned about Alpine Linux for the container image. I was using CentOS and Ubuntu images at first and while looking at host images and file sizes I realized I can be more efficient with the containers as well.

Docker Images

REPOSITORY TAG SIZE (MB)
alpine latest 4.15
centos latest 207.0
ubuntu latest 111.0
busybox latest 1.14

Now why I didn’t use BusyBox instead of Alpine. I just found alpine and apk easy and familiar. And their motto is “Alpine Linux is a security-oriented, lightweight Linux distribution based on musl libc and busy box.” I like security, I like lightweight, and I like Linux.

With all this playing around and researching, I found docker-compose and read up on creating a Dockerfile. I also ran across some important images:

postgres:10.1-alpine
nginx:alpine
jrcs/letsencrypt-nginx-proxy-companion
jwilder/docker-gen
WordPress (there are different flavors of alpine, apache, and different versions of PHP)

What I wanted in my ecosystem is Postgres (Phoenix, Rails, and my goto DB), MySQL (for my WordPress sites), Redis, MongoDB + R, Nginx Proxy, Apache Virtual Hosting not just 1 instance of WordPress per container.

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Programming languages/platforms and their package managers

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This isn’t a complete list nor is it a best of list. This is just a list of what i’ve found and use.

Language / PlatformLibrary / Package Manager
Alpine Linuxapk
Cclib
CentOSapt-get
Common LispQuicklisp
Erlang / Elixirhex.pm
JavaScriptYARN
Mac OSXHomebrew / Ports
Node.jsnpm
PerlPPM / CPAN
PHPComposer
PythonPip / Eggs
RubyRubyGems
Ubuntuapt / yum

Batch clean up of local git branches

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I usually add an alias in my .zshrc file so that I can run a single command to clean up feature branches that are merged into master or develop.

But if you run:

This will remove all branches that are merged into master or develop.

How to speed up bundle install on a Mac

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Most new laptops/computers come with multiple cores standard.

So assuming you do have a system with multiple cores why not use them.

* This might work on any *nix system just find the appropriate commands.

Setup Jenkins and BitBucket without plugins

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This was pretty straight forward since BitBucket has hooks ready for Jenkins.

I usually create 2 Jenkins projects, 1 to build and 1 to deploy.

Jenkins Server

Make sure you have a Jenkins user that can Read Overall and Read Job. I use “Project-based Matrix Authorization Strategy” you can find that under “Configure Global Security”

So I have a user called automated-user and it has Read Overall and Read Job checked. It also has an API Token you will need that you will find here: Jenkins >> Manage Jenkins >> Manage Users >> Select your user, in my case ‘automated-user’ >> Configure >> “Show API Token”. I get eadefe23232121232sdasdfadf as an example.

Build Project

Give the project a name: project-name-build
Source Code Management: Select “Git Repositories” >> Repository URL = https://username@bitbucket.org/username/git-repo.git >> Add credentials & Select it.
Build Triggers: Check, “Trigger builds remotely (e.g., from scripts)” >> Authenticated Token, enter a token SecureRandom.urlsafe_base64 works well for this. Lets say we got this: wtOhS3d4TV1MRX_bVn_lAA

Deploy Project

Source Code Management: Select “Git Repositories” >> Repository URL = https://username@bitbucket.org/username/git-repo.git >> Add credentials & Select it.
Build Triggers: Check, “Build after other projects are built”

BitBucket

Go to: Your Repo >> Settings >> Hooks >> Select Jenkins

Enter: 
Endpoint: http://automated-user:eadefe23232121232sdasdfadf@ci-server-address.com
Project Name: project-name-build
Token: wtOhS3d4TV1MRX_bVn_lAA

Save.

You should be good to go minus some settings you’ll need to configure based on your needs.

Creating a new rails app

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How to create a new project withouttest unit and with postgresql database

 

My grep commands

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When I search for things in my codebase I find that using the terminal and grep is usually the best option. Here is what I usually run:

 

Learn how to use top command in linux

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I find myself using this often while debugging errors or trying to figure why a server is slow or unresponsive.