gistfile1.rst

Deploying Go applications in tsuru

Overview

This document is a hands-on guide to deploying a simple Go web application in Tsuru.

Creating the app within tsuru

To create an app, you use app-create command:

$ tsuru app-create <app-name> <app-platform>

For Ho, the app platform is, guess what, go! Let's be over creative and develop a hello world tutorial-app, let's call it "helloworld":

$ tsuru app-create helloworld go

To list all available platforms, use platform-list command.

You can see all your applications using app-list command:

$ tsuru app-list
+-------------+-------------------------+---------+--------+
| Application | Units State Summary     | Address | Ready? |
+-------------+-------------------------+---------+--------+
| helloworld  | 0 of 0 units in-service |         | No     |
+-------------+-------------------------+---------+--------+

Once your app is ready, you will be able to deploy your code, e.g.:

$ tsuru app-list
+-------------+-------------------------+-------------+--------+
| Application | Units State Summary     | Address     | Ready? |
+-------------+-------------------------+-------------+--------+
| helloworld  | 0 of 0 units in-service |             | Yes    |
+-------------+-------------------------+-------------+--------+

Application code

Git deployment

When you create a new app, tsuru will display the Git remote that you should use. You can always get it using app-info command:

$ tsuru app-info --app blog
Application: go
Repository: [email protected]:blog.git
Platform: go
Teams: myteam
Address:

The git remote will be used to deploy your application using git. You can just push to tsuru remote and your project will be deployed:

$  git push [email protected]:helloworld.git master
Counting objects: 86, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (75/75), done.
Writing objects: 100% (86/86), 29.75 KiB, done.
Total 86 (delta 2), reused 0 (delta 0)
remote: Cloning into '/home/application/current'...
remote: requirements.apt not found.
remote: Skipping...
remote: /home/application/current /
#####################################
#          OMIT (see below)         #
#####################################
remote:  ---> App will be restarted, please check its log for more details...
remote:
To [email protected]:helloworld.git
 * [new branch]      master -> master

If you get a "Permission denied (publickey).", make sure you're member of a team and have a public key added to tsuru. To add a key, use key-add command:

$ tsuru key-add ~/.ssh/id_rsa.pub

You can use git remote add to avoid typing the entire remote url every time you want to push:

$ git remote add tsuru [email protected]:helloworld.git

Then you can run:

$ git push tsuru master
Everything up-to-date

And you will be also able to omit the --app flag from now on:

$ tsuru app-info
Application: helloworld
Repository: [email protected]:blog.git
Platform: go
Teams: myteam
Address: helloworld.cloud.tsuru.io
Units:
+--------------+---------+
| Unit         | State   |
+--------------+---------+
| 9e70748f4f25 | started |
+--------------+---------+

For more details on the --app flag, see "Guessing app names" section of tsuru command documentation.

Running the application

As you can see, in the deploy output there is a step described as "Restarting your app". In this step, tsuru will restart your app if it's running, or start it if it's not. But how does tsuru start an application? That's very simple, it uses a Procfile (a concept stolen from Foreman). In this Procfile, you describe how your application should be started. Here is how the Procfile should look like:

web: ./main

Now we commit the file and push the changes to tsuru git server, running another deploy:

$ git add Procfile
$ git commit -m "Procfile: added file"
$ git push tsuru master
#####################################
#                OMIT               #
#####################################
remote:  ---> App will be restarted, please check its log for more details...
remote:
To [email protected]:helloworld.git
   d67c3cd..f2a5d2d  master -> master

Now that the app is deployed, you can access it from your browser, getting the IP or host listed in app-list and opening it. For example, in the list below:

$ tsuru app-list
+-------------+-------------------------+---------------------+--------+
| Application | Units State Summary     | Address             | Ready? |
+-------------+-------------------------+---------------------+--------+
| helloworld  | 1 of 1 units in-service | blog.cloud.tsuru.io | Yes    |
+-------------+-------------------------+---------------------+--------+

It's done! Now we have a simple go project deployed on tsuru.

Now we can access your app in the URL http://helloworld.cloud.tsuru.io/.

Going further

For more information, you can dig into tsuru docs, or read complete instructions of use for the tsuru command.