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How To Install Buildbot on CentOS 7

Buildbot is a continuous integration tool based on Python which automates the build, test and release software cycles. It is built using the Twisted networking engine, supports parallel execution of jobs across multiple platforms and it is compatible with all major operating systems. The Buildbot installation can have one or more masters and number of workers. In this tutorial, we will show you how to install Buildbot master and worker on a CentOS VPS.

1. Update the System

Before continuing with the tutorial, make sure all the system packages are up to date:

sudo yum update

2. Installing Buildbot

Installing Buildbot with pip is pretty straight forward process. First you need to install pip and python development packages using the yum package manager:

sudo yum install python-pip python-devel

If you want more detailed instruction about how to install install pip on CentOS 7 you can check this tutorial.

Execute the following command to upgrade the pip to the latest version:

sudo pip install --upgrade pip

The output should look something like this:

Collecting pip
  Downloading https://files.pythonhosted.org/packages/0f/74/ecd13431bcc456ed390b44c8a6e917c1820365cbebcb6a8974d1cd045ab4/pip-10.0.1-py2.py3-none-any.whl (1.3MB)
    100% |████████████████████████████████| 1.3MB 165kB/s
Installing collected packages: pip
  Found existing installation: pip 8.1.2
    Uninstalling pip-8.1.2:
      Successfully uninstalled pip-8.1.2
Successfully installed pip-10.0.1

Once the pip is installed and updated to the latest version we can proceed with the Buildbot installation. Execute the following command to install Buildbot with pip:

sudo pip install 'buildbot[bundle]'

If the installation is successfully completed you should see something like this:

Installing collected packages: Twisted, PyJWT, future, buildbot-www, buildbot-worker, buildbot-console-view, buildbot-waterfall-view, buildbot-grid-view, buildbot
  Running setup.py install for Twisted ... done
  Running setup.py install for future ... done
Successfully installed PyJWT-1.6.1 Twisted-18.4.0 buildbot-1.1.1 buildbot-console-view-1.1.1 buildbot-grid-view-1.1.1 buildbot-waterfall-view-1.1.1 buildbot-worker-1.1.1 buildbot-www-1.1.1 future-0.16.0

4. Verify the Buildbot installation

To verify if Buildbot has been correctly installed type:

sudo buildbot --version
Buildbot version: 1.1.1
Twisted version: 18.4.0

5. Create a new system user for Buildbot

We will create a new system user and group which will run our Buildbot services:

sudo adduser --home /opt/buildbot --shell /bin/bash  buildbot

6. Configuring the Buildbot Master

Now that we have Buildbot installed we can continue and create and configure our first Buildbot master.

Before continue with the next commands switch to the new buildbot user by typing:

sudo su - buildbot

To create the Buildbot master run the following command:

buildbot create-master master

The output should look something like this:

mkdir /opt/buildbot/master
creating /opt/buildbot/master/master.cfg.sample
creating database (sqlite:///state.sqlite)
buildmaster configured in /opt/buildbot/master

Copy the default sample Buildbot configuration file by using the following command:

cp master/master.cfg.sample master/master.cfg

If you want to be able to access the Buildbot’s web interface on your server IP address or domain you need to change the BuildbotURL setting in the configuration file.

Open the configuration file:

nano master/master.cfg

c['buildbotURL'] = "http://your_ip_or_domain:8010/"

Do not forget to replace your_ip_or_domain with your actual domain or IP address.

Once you save the file run the following command to verify the master configuration:

buildbot checkconfig master

If everything is ok you should see the following output:

Config file is good!

To start the Buildbot master run the following command:

buildbot start master

If there are no errors you should see the following output:

Following twistd.log until startup finished..
The buildmaster appears to have (re)started correctly.

Once the Buildbot master is started you can access the web interface at:

http://yor_ip_or_domain:8010/

7. Configuring a Buildbot Worker

For sake of simplicity we will install and configure our first Buildbot worker on the same server as the master.

To create the Buildbot worker named ‘example-worker’ with password ‘pass’ on ‘localhost’, execute the following command:

buildbot-worker create-worker worker localhost example-worker pass

The output should look something like this:

mkdir /opt/buildbot/worker
mkdir /opt/buildbot/worker/info
Creating info/admin, you need to edit it appropriately.
Creating info/host, you need to edit it appropriately.
Not creating info/access_uri - add it if you wish
Please edit the files in /opt/buildbot/worker/info appropriately.
worker configured in /opt/buildbot/worker

If you want to use a different username (example-worker), and password (pass) you need to update the following line in the master/master.cfg file:

# a Worker object, specifying a unique worker name and password.  The same
# worker name and password must be configured on the worker.
c['workers'] = [worker.Worker("example-worker", "pass")]

Finally we can start the worker by typing:

buildbot-worker start worker

If there are no errors you should see the following output:

Following twistd.log until startup finished..
The buildbot-worker appears to have (re)started correctly.

8. Finalize the Buildbot installation via web browser

You can now navigate to http://yor_ip_or_domain:8010/ and start configuring your Buildbot instillation.

Of course you don’t have to install Buildbot on CentOS 7, if you use one of our managed CentOS VPS hosting services, in which case you can simply ask our expert Linux admins to install Buildbot for you. They are available 24×7 and will take care of your request immediately.

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