Building Docker image with installed Terraform.

Run the latest ubuntu container:

 docker container run -it --name ubuntu-latest ubuntu:latest /bin/bash

then we need to download, unzip and install the latest version of terraform. Currently, the latest one is 0.13.3. Make sure to check it here:

https://www.terraform.io/downloads.html

apt-get update
apt-get install wget -y
apt-get install unzip -y
wget https://releases.hashicorp.com/terraform/0.13.3/terraform_0.13.3_linux_amd64.zip
cp terraform /usr/local/bin
terraform --version
exit

Now we have installed terraform (as well as unzip and wget) and shut the container down.

docker ps -a should confirm that

docker ps -a                                                                                                                        
CONTAINER ID        IMAGE               STATUS                                NAMES
63016bcefec6        ubuntu:latest       Exited (0) About a minute ago         ubuntu-latest

docker container diff ubuntu-latest will print us all the changes applied to this container. If you want to read it though make yourself a cup of tea, it'll take a while.

We probably don't need all the changes, so let's do a little clean up:

docker start ubuntu-latest -a to start the container and attach to it.

 rm terraform
 rm terraform_0.13.3_linux_amd64.zip
 apt-get remove unzip -y
 apt-get remove wget -y
 exit

this container is still going to have some changes due to the apt-get update call, but I'm ok with that.

What's important is that we have (A)dded the terrafrom binary to its onwn place:

A /usr/local/bin/terraform

So, it's time to commit the image:

docker container commit -a "@asizikov" -m "installed terraform 0.13.3" \
ubuntu-latest ubuntu-terraform

docker images should list all the images installed on your computer, and ubuntu-terraform should be among them.

Ok, it's time to tag and publish, I guess.

docker image tag ubuntu-terraform:latest asizikov/ubuntu-terraform:0.13.3
docker push asizikov/ubuntu-terraform:0.13.3

It's

docker save asizikov/ubuntu-terraform:0.13.3 > ubuntu-terraform.tar
mkdir unpacked
tar -xf ubuntu-terraform.tar -C unpacked
cd unpacked
tree

this will produce a nice tree structure with all our layers:

├── 57f79de53e5eeff9c780866667a034a2b3959dc115b18f5cea5aec32b9677239.json
├── 70b23ca3cba25ea431e904e2d4a90f144f52b907da5afee7e2e1a6004b9e3a35
│   ├── VERSION
│   ├── json
│   └── layer.tar
├── 7e08bf461d394ea068ee4836367cc46d4e1e47d9e848043c4b63a61b8c0e714a
│   ├── VERSION
│   ├── json
│   └── layer.tar
├── 8c91f14beadb4dcf4e11153514476e705521a0fbab80c27a1b582241a4f91b75
│   ├── VERSION
│   ├── json
│   └── layer.tar
├── 8e6ad6de8875a0658e8e86659248cdaa0d9de73b2132d94f685eb044115e1114
│   ├── VERSION
│   ├── json
│   └── layer.tar
├── manifest.json
└── repositories

let's find the latest layer:

$ cat repositories                                                          
{"asizikov/ubuntu-terraform":{"0.13.3":"8e6ad6de8875a0658e8e86659248cdaa0d9de73b2132d94f685eb044115e1114"}}
$ cd 8e6ad6de8875a0658e8e86659248cdaa0d9de73b2132d94f685eb044115e1114
$ mkdir unpack_layer
$ tar -xf layer.tar -C unpack_layer
$ cd unpack_layer 
$ tree

This will print the large tree with all the files which belong to the layer, and we can scroll all the way down to find our terraform executable. Lovely.

Make sure to take a look there and think how can we make this image smaller.

.
├── usr
│   ├── bin
│   ├── local
│   │   ├── bin
│   │   │   └── terraform

PS:

Don't forget to clean things up:

rm -rf unpacked
rm -f ubuntu-terraform.tar
docker container rm ubuntu-latest
docker image rm asizikov/ubuntu-terraform:0.13.3

That's all folks! Happy dockering.