Docker server Setup

published about 4 years agoApr 6th, 2015

Docker Host Server Setup

credit: markus-spiske-193031-unsplash.jpg

Basic Monitoring Tools

# Debian/BSD Requirements / Updates + monitoring tools: atop & htop
apt-get update && apt-get install -y vim-nox git-core curl atop htop build-essential libssl-dev linux-image-amd64 linux-headers-amd64 sudo

# OSX, Debian & RHEL: Host OS Tuning
sysctl -w vm.max_map_count=262144

# Updates Profile init scripts before appending new scripts below
mkdir ~/backups
cp ~/.bash* ~/backups/

# Debian/BSD:  Append Shell Environment Shortcuts + XTERM Colors
curl -o- | bash

curl -sSL >> ~/.bashrc
curl -sSL >> ~/.bash_aliases
# Read into current shell (login steps already missed the aliases file)
source ~/.bashrc

# Docker pre reqs
# sudo apt-get install -y linux-image-virtual linux-image-extra-virtual
# Install Docker, straight from the horses mouth
curl -sSL | sh

Only for SELinux Enabled Systems

# SELinux fixes (optional)
# chcon -Rt svirt_sandbox_file_t /mongodb
# chcon -Rt svirt_sandbox_file_t /elastic

Simple Database Setup/Startup

MongoDB v3 Server

mkdir /mongodb
docker run --name mongo -p 27017:27017 -v /mongodb:/data -d mongo:latest bash -c 'mongod --logpath /data/mongodb.log --logappend --dbpath /data/data --storageEngine=wiredTiger'
mkdir /elastic
docker run --name elastic -d -p 9200:9200 -p 9300:9300 -v /elastic:/data elasticsearch bash -c 'elasticsearch elastic_cluster elastic01 /data/elastic-data --path.logs /data/elastic-logs '

You just lit up 2 database docker instances!!! If it were any easier, I’m pretty sure you couldn’t invoice for it.

Package up your NodeJS/Ruby/Python/Web App

  1. Add a blank file named Dockerfile in your project root.
  2. (Optional, Recommended) Add a .dockerignore using .gitignore rules to exclude large non-essential paths. By default all project files are included.

Create a Dockerfile

# Example for NodeJS
FROM node:0.12
EXPOSE [3000]
COPY . /app/
RUN apt-get update \
	&& apt-get dist-upgrade -y
RUN ["npm", "install"]
# Overridable Command
CMD ["npm", "start"]

It’s easier to show how to start using the Dockerfile and demonstrate the results via console (see commands below).

In terminal, cd to your project folder and run the following build command everytime you deploy changes - or want to change/upgrade OS or Env config)

docker build -t app-name-here .

Docker Commands to Learn

Build Docker Image Every Deploy/Change

docker build -t app-name-here .
docker run -d --name webapp01 -p 3000:3000 --link mongo:mongo --link elastic:elastic app-name-here

Run Interactively (non-daemon, in terminal)

docker run -it --name webapp01 -p 3000:3000 --link mongo:mongo --link elastic:elastic app-name-here bash

Delete Container Instance or Image

Important: Any data not stored on the mounted volume path will be lost!!

# Delete Image
docker rmi -f app-name-here
docker rm -f webapp01
# now re-run your `docker run...` from ^^^
# So for example, let's kill your db instances above, run: ( start with something like `docker stop {mongo,elastic}` )
docker rm -f mongo elastic

Unless otherwise noted, all content is copyright Dan Levy 2014-1019.