Docker 🐳

All my posts about Docker

Update to CentOS 7 Docker install one-liner

UPDATE 26/07/2015 In typical fashion, a few weeks after posting this Docker themselves released a much better version than mine, you can install it using the following commands; Update to CentOS 7 Docker install one-liner 1/2 c s d u y o r s c l t k e e - m r s c S t r L l u n h e t n h t a e p b l s l l : e o / - / d w g o o e c r t k l . e d d r o c & k a e m r p . ; c & o a m m / p ; | s s y h s t e m c t l s t a r t d o c k e r What follows is the original, now mostly redundant post. ...

OpenShift Origin V3

After being nagged by the gaffer to try OpenShift Origin V3 I finally got round to running a test server using Vagrant on my Mac. I must say, going into this that the documentation at this stage is struggling a little to keep up with the development and these instructions are the results of much trial, error & Googling. Also, the product is very much still in active development and there have been several bugs, like this one↗ , which have caused the instructions below not to work. ...

Unlock the full potential of Docker with Machine, Compose, & Swarm. Learn how to orchestrate containers, and create clusters across different platforms!

Docker Machine, Compose & Swarm

Since I last properly [wrote about Docker](/2014/08/31/docker-fig-nginx-reverse-proxies-and-centos-7/“Docker, Fig, NGINX Reverse Proxies and CentOS 7”) a lot has changed. Docker have introduced some new command line tools which allow for easy orchestration of Docker instances, clusters and container management. These are; Docker Machine↗ — Allows you to easily deploy Docker instances to a lot of different platforms. Docker Compose↗ — A replacement for Fig↗ . Docker Swarm↗ — Native clustering for your Docker instances. Out of these three technologies, Swarm is not really suitable for production use so I won’t go into it in too much detail in this post. ...

Experimented with Docker and HHVM for our Drupal7 site at work, achieving a seamless transition and saving significant setup time.

An Experiment with Docker & HHVM

Now the dev team at work↗ have moved over to using Docker we decided to have some fun. An internal system we use is based on Drupal7↗ , the development version of the site has a NGINX / PHP 5.4 container↗ running in front of it. We have been hearing alot about HHVM↗ so why not try building a container and seeing if it our codebase works? ...

Successfully upgraded to Docker 1.3 with process injection feature on CentOS, bypassing outdated repos with a manual install.

Installing Docker 1.3.x on CentOS 7

When Docker 1.3↗ was released a few weeks ago I was interested in using the process injection docker exec functionality. Unfortunately, all of the repos which provide RPMs for Docker are out of date, the documentation suggests a manual installation↗ of the binary which is turns out to be straight forward: Installing Docker 1.3.x on CentOS 7 1/2 # c # c c # s s # c u u u y y u D r D r r E s s I r o l o l l n t t n l w w a e e s n - n - - b m m t - l L l L L l c c a L o o e t t l a h a h h l l l h d t d t t & t t t t e s F t t p t p p s n t i p h s h s s t a a g s e : e : : a b r : / / r l t a / b / s / t e s / i g y r r d g n e s a a t d o w i a t t w w h o c e t r . e . . e c k l h y d m g g k e l u o d i i s e r b & c t t e r . k f h h r c s e i u u v o e r l b b i m t . e u u c / c s s s e d t o e e o h m r r c e / c c k b o o e p u n n r e i t t / r l e e f m d n n i i s t t g s / . . / s L c c r i i o o e o n m m l n u / / e s x d d a / o o s x c c e 8 k k s 6 e e / _ r r d 6 / / o 4 d d w / o o n d c c l o k k o c e e a k r r d e / / / r m m 1 - a a . l s s 0 a t t . t e e 0 e r r / s / / f t c c i o o g > n n - t t ` / r r u u i i n s b b a r / / m / i i e b n n i i i - n t t s / / / ` d s s - o y y ` c s s u k t t n e e e a r m m m ; d d e / / c d d - h o o m m c c ` o k k d e e > r r + . . / x s s u e o s / r c r u v k / s i e l r c t o / e c b > a i > l n / / u b d u s i o s r n c r / k l f e l i i r i b g b ; s s y c y s h s t m t e o e m d m d d + s x s y y s / s t u t e s e m r m / d l d o o o c c c k a k e l e r / r . b . s i s o n e c / r k f v e i i t g c e now to check it works: ...

Exploring CoreOS on DigitalOcean: From setting up a single instance with familiar tools to configuring a powerful container-oriented OS.

Very basic CoreOS

On Friday DigitalOcean announced the availability↗ of CoreOS↗ on their platform. CoreOS is a very optimized Operating System which is designed to just run containers. While it has some very powerful clustering elements made up of …. etcd↗ fleet↗ systemmd↗ …. I decided my first step should be to do the opposite of every blog post I have read about CoreOS and run a single instance with the tools I am used to using. ...

Exploring Docker's rapid updates and the ecosystem, including using Fig for container orchestration and setting up an NGINX reverse proxy.

Docker, Fig, NGINX Reverse Proxies and CentOS 7

I have been writing a lot about Docker↗ and how I have used it over the last several months so why another another post? Well, for a start it has a lot of momentum. Since Docker went 1.0 in June↗ there have been two further↗ releases↗ . Also, the ecosystem which has sprung up around Docker is keeping up the same pace as well. This means that there is always a lot of new shinny things to play with such as ….. ...

Learn how I seamlessly access and manage containers without SSH using nsenter and docker-enter on CentOS 7, making DevOps simpler.

Connecting to Docker Containers

I have been installing and exposing SSH on most of the containers I have deployed, which I know is wrong. As I have been trying to do things in a more “devops” way I decided to do a little reading on how I can enter and leave running containers on my CentOS 7 instance without having to expose SSH or configure users. This is when I came across nsenter↗ & docker-enter↗ . As you can see from the following instructions and terminal session installing nsenter and then using docker-enter to connect to a running container is a breeze; ...