Prerequisites

You will need docker to be installed on your machine.

Getting Started with Kaiser

Kaiser is a Ruby Gem. You can install it using

gem install kaiser

We don't recommend adding it to your bundle files, because Kaiser is more useful as an environment handler than a gem that your program can use.

A Minimal Example

Do this tutorial to learn Kaiser!

Since Kaiser is meant to be used to improve the dev process of a web app, it makes no sense to go into all the different ways it can be used, so this section is written like a tutorial with a simple example to demonstrate its usage.

This tutorial will show you 3 simple steps to illustrate how to get started with Kaiser. At the end of this tutorial you will be directed to where you can find more detailed topics about how to use Kaiser

1. Start with a folder

First of all, create a directory called hello

mkdir hello

And enter it

cd hello

2. Make a simple app

In order to use this you need a Kaiserfile and a Dockerfile at the very least.

For this very simple example lets make an extremely simple application that serves Hello Kaiser. In order to do this, we just have to create a Dockerfile containing the following:

touch Dockerfile

# Dockerfile
FROM public.ecr.aws/degica/barcelona-hello

RUN echo 'Hello Kaiser' > /var/www/static/index.html

The public.ecr.aws/degica/barcelona-hello image is a simple image that contains just an nginx server and a fileserver that serves out of /var/www/static/ in the container. You can find its source code here: https://github.com/degica/barcelona-hello

And then we create a Kaiserfile

touch Kaiserfile

# Kaiserfile
dockerfile 'Dockerfile'

expose '8080'

3. Start up the App

Now we initialize Kaiser. We do this with the kaiser init command. This command takes one parameter called the environment name, and it is stored in a configuration file in $HOME/.kaiser/config.yml so it is global to your user.

This allows Kaiser to set up some data required to start your environment. This only needs to be done once. If you want to throw this environment away, you can call kaiser deinit

kaiser init hello

In this case, we call our environment hello. This is also important as it will be the prefix for the DNS name that will be used for this. In this case by default, setting the environment name to hello makes the URL for the app http://hello.lvm.me

Having done that, we can start up the program using:

kaiser up -av

And you should be able to go to http://hello.lvm.me and find a page that displays the text Hello Kaiser

That's all, folks!

Congratulations for getting to the end of the tutorial for Kaiser! Obviously you would want to find out more!

To find out about how you would provide this application with a database, check out Databases.

To find out how to set up HTTPS on your server, go to Suffixes.

To find out more about setting up environment variables, and other features, go to Kaiserfile

Useful Commands

Run stuff in the container

You can run stuff inside your container by going

bundle exec kaiser login sh

And you can do anything inside the container.

If you need root,

bundle exec kaiser root sh

Attach to the container

If you want to run with the container in the foreground simply go

bundle exec kaiser attach

This is similar to kaiser login but it terminates the running container, whereas kaiser login will simply run you in the same container as the running container.

bundle exec kaiser attach nano /etc/hosts

Save database state

bundle exec kaiser db_save customer_setup

You can also save your database state to a file in your current dir:

bundle exec kaiser db_save ./my_setup.dbimage

Load database state

bundle exec kaiser db_load customer_setup

You can load a previously saved database file that you have

bundle exec kaiser db_load ./my_setup.dbimage

Get ports

Kaiser decides what ports to use on the host. To know them simply go

bundle exec kaiser show ports

Curious?

You can see what Kaiser is doing under the hood with the -v flag:

bundle exec kaiser -v db_reset