Setting Up a Chef Server on Ubuntu 14.04

December 19, 2016 |

Setting Up a Chef Server on Ubuntu 14.04

Recently, in the process of setting up a Chef Server on an Amazon EC2, we ran into a bit of a snag resulting from how Ubuntu 14.04’s internal hostname is setup:

...
================================================================================
Recipe Compile Error in /var/opt/opscode/local-mode-cache/cookbooks/private-chef/recipes/default.rb
================================================================================

Chef::Exceptions::ValidationFailed
----------------------------------
common_name is required
...

 

In this tutorial we will walk you through setting up your own Chef Server on Ubuntu 14.04, with specific attention on setting up your hostname correctly and avoiding this error.

As a first step, open AWS EC2, click “Launch Instance,” and choose the Ubuntu 14.04 AMI. Next, make sure you choose an instance that has at least 4 GB of memory (e.g. t2.medium). Other than that, make sure you are launching your instance into a VPC that provides public DNS hostnames (this is the case for the default Amazon VPC and any VPC that you create with the VPC wizard) and that you use network settings that will allow you to access the server via SSH. When the instance is ready, go ahead and connect:

$ ssh ubuntu@

Once logged in, switch to the root user:

ubuntu@ip-xxx.xx.xx.xxx:~$ sudo su -

At this point we need to install Chef Server.

Install Chef Server

1. Download the package

$ wget https://packages.chef.io/stable/ubuntu/14.04/chef-server-core_12.8.0-1_amd64.deb

2. Install with dpkg:

$ dpkg -i chef-server-core_12.8.0-1_amd64.deb
Set Your Hostname

This part is the real reason for this tutorial. The installation instructions from Chef mention that the Chef Server host needs to have a Fully Qualified Domain Name (FQDN). Our Ubuntu instance isn’t set up correctly for this by default and we can see that by running the command:

$ hostname -f
hostname: Name or service not known

 

Your EC2 instance has one if it was configured in the pattern laid out above, and it can be found in the EC2 console by selecting your instance and looking under the “Description” tab next to “Public DNS.”

There are three places we need to use our public DNS address:
1. /etc/hosts

When you open this file you’ll notice that it has 127.0.0.1 localhost. Since localhost isn’t a FQDN, we need to change this to our public DNS. When you’re done, the top portion of your file should look something like this:
127.0.0.1 ec2-xx-xx-xxx-xxx.us-west-2.compute.amazonaws.com

2. /etc/hostname

This file holds just the hostname, without reference to an IP address. When you open it on a new EC2 Ubuntu instance, it should just have something like: ip-xx-xx-xxx-xxx. Remove that and add your public DNS address.

3. Finally, we need to run the hostname command to update our hostname without having to exit the system and log in again.

$ hostname ec2-xx-xx-xxx-xxx.us-west-2.compute.amazonaws.com

Now, we should get a different result when we run the command above that gave us the “Name or service not known” error:

root@ip-xx-xx-xxx-xxx:~# hostname -f
ec2-xx-xx-xxx-xxx.us-west-2.compute.amazonaws.com
Reconfigure Chef Server

Now that we’ve set up our hostname correctly, we can reconfigure the Chef Server for the first time without getting any errors:

root@ip-xx-xx-xxx-xxx:~# chef-server-ctl reconfigure
...
...
Chef Client finished, 393/464 resources updated in 01 minutes 57 seconds
Chef Server Reconfigured!

 

From here on, you can continue with the official installation instructions, starting with step 5 in the Standalone section.

If you are interested in having our team help you in your projects, please contact us at info@reancloud.com.  Also, if you like these kind of problems and want to join our team please contact us at careers@reancloud.com or visit us at http://www.reancloud.com/company/careers/.

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