Dokku is an open-source Platform as a Service (PaaS) that simplifies application deployment using Docker containers. Installing the Dokku template on your VPS allows you to easily manage and deploy applications. Here's a step-by-step guide to get you started, with a sample Getting Started Ruby App:
Step 1: Connect to Your VPS
Use SSH to access your VPS. Open your terminal and run:
ssh root@your_vps_ip
Replace your_vps_ip with your VPS's IP address. Enter your VPS password when prompted.
Step 2: Verify Dokku Installation
After logging in, ensure Dokku is installed by checking its version:
dokku version
If Dokku is installed correctly, this command will display the installed version.
Step 3: Finish configuring Dokku for VPS
you can use any domain you already have access to, this domain should have an A record or CNAME pointing at your server's IP:
dokku domains:set-global example.vps
or you can also use the IP of your server:
dokku domains:set-global 222.222.22.22
On your local machine (not VPS) run:
cat ~/.ssh/your_key.pub | ssh root@your_vps_ip dokku ssh-keys:add name
replace your_key.pub with your local SSH public key, your_vps_ip with your VPS IP and name with a preferred name. Enter your VPS password when prompted.
Step 4: Create a Dokku Application
Download Ruby Getting Started application on your local machine:
git clone https://github.com/heroku/ruby-getting-started
Return to your VPS terminal and run this command:
dokku apps:create ruby-getting-started
This initializes an app on Dokku with the specified name (replace ruby-getting-started with your desired app name)
Dokku by default does not provide datastores (e.g. MySQL, PostgreSQL) on a newly created app.
The Getting Started app requires a PostgreSQL service, so install the plugin and create the related service as follows:
sudo dokku plugin:install https://github.com/dokku/dokku-postgres.git
After that, run the following:
dokku postgres:create railsdatabase
Replace railsdatabase with a preferred name.
Then link your app with a database:
dokku postgres:link railsdatabase ruby-getting-started
On your local machine run:
cd ruby-getting-started
git remote add dokku dokku@your_vps_ip:your_application_name
git push dokku main
Replace your_vps_ip with a your VPS IP address and your_application_name with your created application name.
Note: the remote username must be dokku or pushes will fail
After running git push dokku main, it should start building the app and give you a domain or IP address to enter your app.
Step 5: Access Your Application
Once Dokku completes the build and deployment, your app should be accessible at:
http://your_server_ip:portif you don’t have a domain set up.http://your_app_name.yourdomain.comif you've configured a domain for Dokku.
You can also check the terminal and search for the Application deployed: http://your_server_ip:port
That it! Your Getting Started application is ready to be accessed!
For comprehensive documentation and advanced configurations, visit the Dokku Documentation.