Getting Started¶

The following setup steps have been tested on Ubuntu 16.04 and on Ubuntu 17.10.

Prerequisites¶

This first step is only required on Ubuntu 16.04 and can be skipped if you are on a more recent Ubuntu version. edi requires features that got introduced with Ansible 2.1. On Ubuntu 16.04 you can enable xenial-backports and then install Ansible as follows:
```
sudo apt install ansible/xenial-backports
```
Install lxd:
```
sudo apt install lxd
```
Close and re-open your user session to apply the new group membership (this guide assumes that you are either member of the group sudoers or admin, for details please read the linux containers documentation).
Initialize lxd:
```
sudo lxd init
```
The default settings are ok. Use the storage backend “dir” if there is no zfs setup on your computer.

Installing edi from the PPA¶

For your convenience, you can directly install edi from a ppa:

Add the edi-snapshots ppa to your Ubuntu installation:

sudo add-apt-repository ppa:m-luescher/edi-snapshots
sudo apt-get update

Install edi:
```
sudo apt install edi
```

Working with the edi Source Code¶

Hint: You can skip this section if you just want to use edi without having a look at the source code.

Clone the source code:

git clone https://github.com/lueschem/edi.git

Change into the edi subfolder:
```
cd edi
```

Install various packages that are required for the development of this project:

sudo apt install -y git-buildpackage dh-make equivs && sudo mk-build-deps -i debian/control

Build the edi Debian package (just to verify that everything works):
```
debuild -us -uc
```
Make the development setup convenient by adding some environment variables:
```
source local_setup
```

Setting up ssh Keys¶

If you plan to access edi generated containers or target systems using ssh, it is a good idea to create a ssh key pair. Hint: edi versions greater or equal than 0.11.0 have a secure by default setup of ssh and disable password based login.

Review if you already have existing ssh keys:
```
ls -al ~/.ssh
```
Valid public keys are typically named id_rsa.pub, id_dsa.pub, id_ecdsa.pub or id_ed25519.pub.

If there is no valid ssh key pair, generate one:

$ ssh-keygen -t rsa -b 4096 -C "you@example.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/home/YOU/.ssh/id_rsa):
Created directory '/home/YOU/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:

Hint: If you decided to use a passphrase and do not want to reenter it every time, it is a good idea to use a ssh-agent.

Building a First Container¶

Create an empty project folder:

cd ~/
mkdir my-first-edi-project
cd my-first-edi-project

Generate a configuration for your project:

edi config init my-project debian-stretch-amd64

Build your first (development) lxc container named my-first-edi-container:

sudo edi -v lxc configure my-first-edi-container my-project-develop.yml

Exploring the Container¶

Log into the container using your current user name (Note: This user is only available within a development container.) Use the password ChangeMe!:
```
lxc exec my-first-edi-container -- login ${USER}
```
Change the password for your container user:
```
passwd
```
Install a package within the container:
```
sudo apt install cowsay
```
Share a file with the host (Note: The folder ~/edi-workspace is shared with your host.):
```
cowsay "Hello world!" > ~/edi-workspace/hello
```
Leave the container:
```
exit
```
Read the file previously created within the container:
```
cat ~/edi-workspace/hello
```
Enter the container as root (Note: This is useful if you have a container without your personal user.):
```
lxc exec my-first-edi-container -- bash
```
And leave it again:
```
exit
```
Get the IP address of the container:
```
lxc list my-first-edi-container
```
Enter the container using ssh:
```
ssh CONTAINER_IP
```
And leave it again:
```
exit
```