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Docker

Create a Clever Cloud account

The API of Clever Cloud uses OAuth 1 to perform authentication actions. There are two ways to signup to Clever Cloud: email or GitHub login.

Go to the Clever Cloud Console and select the method you prefer.

Email Authentication

This kind of auth requires a valid and non-temporary disposable e-mail, and a password having at least 6 characters. Do not forget to validate your email by clicking the link you will receive.

GitHub Authentication

The GitHub signup allows you to create an account or link your existing one to GitHub, in one click. This process asks the following permissions: 

  • Read your Public Key
  • Read User Repositories

The “repository permission” is used to deploy your GitHub apps directly to Clever Cloud, with a simple step.

If you need to give access to Clever Cloud’s API to a specific GitHub organization, you can do it here.

Two Factor Authentication (2FA)

Clever Cloud supports 2FA. You can enable it here: https://console.clever-cloud.com/users/me/authentication

Please, backup your recovery codes, we won’t be able to restore access to your account if you lose access to your regular codes.

You need to add a SSH key to your Clever Cloud’s account to deploy via Git. SSH keys are used to establish a secure connection between your computer and Clever Cloud. A user can have multiple SSH keys.

I need to create my SSH key

  1. In your Terminal, enter the following bash line:

    ssh-keygen -t ed25519 -C "your_email@youremail.com"
    

    This command creates a new ssh key using the provided email, so that the owner of the key can be identified.

  2. When prompted in which file you want to save the key, just press enter. If it says that the file already exists, enter n for no. Type ls, verify the presence of the file and jump to Add your SSH key on Clever Cloud.

  3. When asked, enter a passphrase:

Generating public/private ed25519 key pair.
Enter file in which to save the key (/your_home_path/.ssh/id_ed25519):
# Now you should enter a passphrase.
Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]

Which should give you something like this:

Your identification has been saved in /your_home_path/.ssh/id_ed25519.
Your public key has been saved in /your_home_path/.ssh/id_ed25519.pub.
The key fingerprint is:
01:0e:e5:2d:ab:98:d6:17:a1:6d:f0:68:9f:d0:a2:db your_email@youremail.com

I created my account with GitHub

If your account is linked to GitHub, a panel with your GitHub SSH keys will appear in the “SSH Keys” tab. You can add any key already present in your GitHub account by clicking on the import button next to it.

Add your SSH key on Clever Cloud

Public SSH Key

To declare your public SSH Key on Clever Cloud, in the left navigation bar, go in “Profile” and in the “SSH Keys” tab, add the key by entering a name and the public SSH key. The key is the entire content of the **id_[ed25519/rsa].pub** file including the id_ed25519/ssh-rsa part and your email.

Private SSH Key

If you want to clone a repository from a private repository, you can add a Private SSH Key to an application by creating a folder clevercloud at the root of your application and creating the file clevercloud/ssh.json with the following content:

{
    "privateKeyFile": "path/to/file"
}

Of course you need to provide a valid path to a file that contains a valid key and that you will push on the Clever Cloud git remote.

If you have trouble configuring this key you can refer to this extended documentation

Create an application on Clever Cloud

via the web console

  1. Create a new app by clicking on the Add an Application button, in the sidebar.
  2. Select a brand new instance (or a repository from GitHub if your account is linked).
  3. Then select Docker in the platform list.
  4. Configure your scaling options.
  5. Enter your application’s name and description and click “Next”. You can also select the region you want (North America or Europe).

Refer to https://www.clever-cloud.com/doc/getting-started/ for more details on application creation via the console.

via the Clever Tools CLI

  1. Make sure you have clever-tools installed locally. Report to https://www.clever-cloud.com/doc/reference/clever-tools/getting_started/
  2. In your code folder, do clever create --type <type> <app-name> --region <zone> --org <org> where type is the type of technology you rely on, app-name the name you want for your application, zone deployment zone (par for Paris and mtl for Montreal), and org the organization ID the application will be created under.

Refer to https://www.clever-cloud.com/doc/reference/clever-tools/create/ for more details on application creation with Clever Tools.

Setting up environment variables on Clever Cloud

With the Clever Cloud console

  1. Go to the Clever Cloud console, and find the app you want to fine tune under it’s organization.
  2. Find the Environment variables menu and select it.
  3. In this menu, you will see a form with VARIABLE_NAME and variable value fields. Fill them with the desired values then select Create.

With the Clever Tools CLI

  1. Make sure you have clever-tools installed locally. Report to https://www.clever-cloud.com/doc/reference/clever-tools/getting_started/
  2. In your code folder, do clever env set <variable-name> <variable-value>

Refer to https://www.clever-cloud.com/doc/reference/reference-environment-variables/ for more details on available environment variables on Clever Cloud. You can of course create custom ones with the interface we just demonstrated, they will be available for your application.

Configure your Docker application

Mandatory configuration

Be sure that you:

  • push on the master branch.
  • have and commit a file named Dockerfile, Here is what it will look like
  • run the application with CMD or ENTRYPOINT in your Dockerfile
  • listen on HTTP port 8080 by default (you can set your own port using CC_DOCKER_EXPOSED_HTTP_PORT=<port> environment variable)

Dockerfile contents

You can virtually put everything you want in your Dockerfile. The only mandatory (for us) instruction to put in it is:

CMD <command to run>

command to run: this is the command that starts your application. Your application must listen on port 8080. It can be easier for you to put a script in your docker image and call it with the CMD instruction.

TCP support

Clever Cloud enables you to use TCP over Docker applications using using the environment variable CC_DOCKER_EXPOSED_TCP_PORT=<port> but it still needs a support request to make use of it. Refer to the support documentation page to know how to reach to them.

Docker socket access

Some containers require access to the docker socket, to spawn sibling containers for instance.

You can make the docker socket available from inside the container by adding the CC_MOUNT_DOCKER_SOCKET=true environment variable. In that case, docker is started in the namespaced mode, and in bridge network mode.

Private registry

We support pulling private images through the docker build command. To login to a private registry, you need to set a few environment variables:

  • CC_DOCKER_LOGIN_USERNAME: the username to use to login
  • CC_DOCKER_LOGIN_PASSWORD: the password of your username
  • CC_DOCKER_LOGIN_SERVER (optional): the server of your private registry. Defaults to Docker’s public registry.

This uses the docker login command under the hood.

Enable IPv6 networking

You can activate the support of IPv6 with a IPv6 subnet in the docker daemon by adding the CC_DOCKER_FIXED-CIDR-V6=<IP> environment variable.

Build-time variables

You can use the ARG instruction to define build-time environment variables.

Every environment variable defined for your application will be passed as a build environment variable using the --build-arg=<ENV> parameter during the docker build phase.

Dockerized Rust application Deployment

To make your dockerized application run on clever Cloud, you need to:

  • expose port 8080 in your docker file
  • run the application with CMD or ENTRYPOINT

For instance, here is the Dockerfile used for the Rust application:

# rust tooling is provided by `archlinux-rust`
FROM geal/archlinux-rust
MAINTAINER Geoffroy Couprie, contact@geoffroycouprie.com

# needed by rust ENV LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

# relevant files are in ./source ADD . /source WORKDIR /source

# Clever Cloud expects your app to listen on port 8080 EXPOSE 8080 RUN rustc -V

# Build your application RUN cargo build

# Run the application with CMD CMD cargo run

Dockerized HHVM application Deployment

Deploying a HHVM application is a bit trickier as it needs to have both HHVM and nginx running as daemons. To be able to have them running both, we need to put them in a start script:

#!/bin/sh

hhvm --mode server -vServer.Type=fastcgi -vServer.Port=9000&

service nginx start

composer install

echo "App running on port 8080"

tail -f /var/log/hhvm/error.log

Since the two servers are running as daemons, we need to start a long-running process. In this case we use tail -f. We then add start.sh as the CMD in the Dockerfile

# We need HHVM
FROM jolicode/hhvm

# We need nginx RUN sudo apt-get update
&& sudo apt-get install -y nginx

ADD . /root RUN sudo chmod +x /root/start.sh

# Nginx configuration ADD hhvm.hdf /etc/hhvm/server.hdf ADD nginx.conf /etc/nginx/sites-available/hack.conf RUN sudo ln -s /etc/nginx/sites-available/hack.conf /etc/nginx/sites-enabled/hack.conf # Checking nginx config RUN sudo nginx -t

RUN sudo chown -R www-data:www-data /root WORKDIR /root

# The app needs to listen on port 8080 EXPOSE 8080

# Launch the start script CMD ["sudo","/root/start.sh"]

Sample dockerized applications

We provide a few examples of dockerized applications on Clever Cloud.

Environment injection

Clever Cloud injects environment variables from your application settings as mentioned in setting up environment variables and is also injecting in your application production environment, those from your linked add-ons.

Git Deployment on Clever Cloud

You need git on your computer to deploy via this tool. Here is the official website of Git to get more information: git-scm.com

Setting up your remotes

  1. The “Information” page of your app gives you your git deployment URL. It looks like this: git+ssh://git@push.clever-cloud.com/<your_app_id>.git. Copy it in your clipboard.

  2. Locally, under your code folder, type in git init to set up a new git repository or skip this step if you already have one.

  3. Add the deploy URL with git remote add <name> <your-git-deployment-url>.

  4. Add your files via git add <files path> and commit them via git commit -m <your commit message>.

  5. Now push your application on Clever Cloud with git push <name> master

Refer to https://www.clever-cloud.com/doc/getting-started/quickstart/ for more details on git deployments.

Linking a database or any other add-on to your application

By linking an application to an add-on, the application has the add-on environment variables in its own environment by default.

On add-on creation

Many add-ons do exist on Clever Cloud, please refer to the full list and check add-ons dedicated pages for full instructions.

During add-on creation, you will see Applications screen, with a list of your applications. You can toggle the button to Link and click next. If you finish the process of add-on creation, the application will automatically be linked to it.

Add-on already exists

In the Clever Cloud console, under the Service Dependencies menu of your application, you can use the Link addons dropdown menu to select the name of the add-on you want to link and use the add button to finish the process.

You can also link another application from the same page in the Clever Cloud console, using the Link applications dropdown menu.

More configuration

Need more configuration? To run a script at the end of your deployment? To add your private SSH key to access private dependencies? Go check the Common configuration page.

You may want to have an advanced usage of your application, in which case we recommend you to read the Administrate documentation section.

If you can’t find something or have a specific need like using a non supported version of a particular software, please reach out to the support.