Learn how to make the perfect server using Swift, under Ubuntu linux running on Amazon EC2, Heroku, Docker or a VirtualBox machine.
Setting up the environment
Developing server side Swift applications is pretty easy if you have a machine that is capable of virtualization. However you can go and start building Swift apps directly on Amazon Elastic Compute Cloud (EC2) or Heroku services if you don't want to bloat your machine with tools like Docker or VirtualBox.
TL;DR: grab the configured Kitura 2.0 example server application from gitlab.
Containerization is extremely popular nowadays and Docker is definitely the top player on the market. In the past people told you there is an app for that, nowadays devops will always tell you:
there is a container for that
brew cask install docker # if you want completions run these commands as well brew install bash-completion brew install docker-completion brew install docker-compose-completion brew install docker-machine-completion
Now run the Docker app. Give the required privileges and wait until docker boots on your system. Congratulations you're ready to compose. Just create a
docker-compose.yaml file with the following contents:
ubuntu-swift: image: swiftdocker/swift volumes: - .:/app
Run the docker-compose command with these arguments:
docker-compose run ubuntu-swift bash # wait until everything finishes and check Swift version root@c031a74aa0f1:/# swift --version Swift version 4.0.2 (swift-4.0.2-RELEASE) Target: x86_64-unknown-linux-gnu
Voila, your virtual linux machine is up and running, ready to compile your source code. You can edit your files on macOS while you can compile everything inside your virtual docker machine. Your directory will be mounted under the
There is a Heroku buildback for Swift that you can use to deploy Swift apps.
Just sign up for Heroku and install the command line tools on your machine.
brew install heroku/brew/heroku
After you have the cli tools, use the buildpack to create a new app.
heroku create --buildpack https://github.com/kylef/heroku-buildpack-swift.git
Enter your Heroku credentials and the script will make you a brand new Swift application on the server. Now you should create a
.swift-version file with the contents of
4.0, and a
Procfile inside your project directory.
web: KituraTutorial --workers 1 --bind 0.0.0.0:$PORT
Now init a git repository with
git init and setup the heroku remote. You can see the details on your application page inside the Heroku dashboard.
heroku git:remote -a your-heroku-app-name
Just commit and push everything from the master to the Heroku remote.
git push heroku master
If something fails, you can enter
heroku logs to see what's going on, but hopefully your server will be up and running if you followed these instructions.
Playing around with server side Swift takes a little bit more effort than using a Docker container. First, you should install the VirtualBox app.
brew cask install virtualbox
Next you have to create your virtual machine and manually install a working operating system - usually a Ubuntu Linux 16.04 LTS - on top of that. You should grab the minimal ubuntu installer image, mount that and follow the instructions.
NOTE: During the install process the partition manager wants to create lots of swap area, so you should double check if your partition sizes are correct, you should give at least 8gigs for the main drive, but I'd go with 16GB.
Anyway, I assume that you made it so far, so it's time to install some tools on the guest machine. Run the following commands inside your VirtualBox instance.
sudo apt-get install virtualbox-guest-additions-iso sudo apt-get install openssh-server
Setup port forwarding to reach your virtual machine easier. Stop the machine, unomunt or even completely eliminate the 'optical' the ubuntu installer disk. Now go to the network settings of the virtual machine.
Click port forwarding, and create a new rule. You can set any kind of host port you want, only the guest port matters. We would like to forward the ssh (22) port via TCP protocol, you can leave the IP fields empty. So basically this will allow you to ssh to your virtual machine from your local machine.
On your host machine, generate a new key-pair.
ssh-keygen -t rsa -b 4096 -C "firstname.lastname@example.org"
Start the virtual machine and SSH into it using your user account and your password.
ssh -p 3022 email@example.com
Hopefully now you are inside your virtual machine through ssh. The thing is that I don't really prefer passwords. So go to your home folder, make an .ssh folder and place an authorized_keys file inside of it.
cd mkdir .ssh nano authorized_keys
Start a new terminal window/tab. List your vbox.pub file contents on your mac, and copy it's content to the authorized_keys file on the virtual machine. If you used nano you can save by ctrl+x and then pressing the y key and return.
Now create or add the following lines to your
~/.ssh/config file on your host / mac.
Host vbox HostName 127.0.0.1 Port 3022 User ubuntu IdentityFile ~/.ssh/vbox
Obviously you should use your ubuntu linux username here.
Congratulations you can simply ssh to virtual machine like this:
No more password typing again and again. You can even control your VirtualBox machine from the command line, with these really useful bash aliases.
alias vbox.start='VBoxManage startvm "ubuntu" --type headless' alias vbox.stop='VBoxManage controlvm "ubuntu" savestate'
Now, you have a bare minimal VirtualBox ubuntu instance with key based ssh authentication, but you still need to install Swift and move the files to the virtual machine in order to make some actual work. As you can see setting up Docker is way more easy and resource friendly so I'd recommend goint with that way.
Before I teach you how to install Swift 4 and syncronize your source files to your instance, let's talk a little bit about Amazon EC2.
You should follow the Amazon Web Services User Guide about how to start an EC2 instance, that'll give you a really basic running machine with linux and an ssh key for the root user that you can use to access your machine.
Creating a new instance is a really easy process, you just have to follow the wizard, but you should note that this won't result as a good production environment.
In the end you'll have an ssh key which you can use to log in to your server, just like we made one for the VirtualBox instance. Don't forget to set up your ssh config file to make your life more pleasant. The only difference is that the EC2 server is "in the cloud", this means you can scale it up and do some other neat things with it.
Now, you are ready to install Swift on Amazon EC2 or on your VirtualBox machine.
- Go to swift.org/download
- Right click on the ubuntu installer link, and copy the url.
curlto download the swift snapshot to your home folder.
tar -xf swift.tar.gz*to unpack the file.
- Rename the extracted folder simply to swift
- Add the following path component to
/etc/environment(use your username)
- Re-ssh to your virtual box machine.
- Try the
- Install some extra packages that you'll need
sudo apt-get install clang libicu-dev libcurl3
You can simply syncronize all your sources into a remote server with the help of the
rsync command, so you can continue using your favorite editor on the host machine. You can also write a simple
makefile and bind the process to your editor's build command. This build script will transfer all the local source files to the remote machine's ~/linux folder, it'll also exclude some local directories.
all: rsync -avzh --progress --exclude=".*" --delete-before ./ vbox:/home/ubuntu/linux
NOTE: I am using Sublime Text, because I just have to press cmd+b to sync everything. Also I always keep an open terminal window with an ssh login to the client, so I can build & run the sources instantly.