Noob question on environment / container OS

[José Antonio Rey]

Hey Gaurav! Responding inline to each of the questions:

On 07/16/2014 12:12 AM, Gaurav Pandit wrote:
> I have just started reading Juju documentation and playing with local
> environment with default environment.
> 
> Before I get too far (writing charms and such), I want to confirm my
> understanding of some basics:
> 
> 1. Is it correct to say that each machine created by juju in the
> environment is basically an Ubuntu OS (most likely 14.04)?

Correct. What Juju does on the cloud is launch a virtual machine or
cloud instance, in which it will deploy, configure and manage the service.

> 2. If that's the case, then
>   a. Does it mean that the commands executed in hooks, say, a basic bash
> script that installs a particular software package, needs to be
> compatible with Ubuntu OS? (e.g. use of "apt-get" and not "yum")

You got this one too. All charms are ran under Ubuntu, which means
scripts need to be Ubuntu-compatible.

>   b. It could be challenging to install older version of any package
> (say Apache 2.2 series) that is not available in 14.04 repository. In
> such cases, instead of "apt-get install", it will have to be compiled
> and built after downloading the source code, and the dependencies need
> to be resolved manually too - is this correct?

Not exactly like that. When you propose a charm you specify the series.
At the current moment, both precise and trusty are open for submissions.
But if you want to have a package that is not in the Ubuntu repositories
for that series, yes, you can compile it, or add a PPA to get the
package from it.

> 
> If this is mentioned somewhere in the documentation, please point me to it.
> 

I don't believe this is stated in the documentation, no.

> (Overall, the documentation is pretty good!)
> 

If there is anything else you need help with make sure to write, we'll
be totally happy to help! Thanks in advance for your interest in writing
Juju Charms, I believe you will find the experience quite enjoyable :)

> Thanks!
> Gaurav
> 
> 

-- 
José Antonio Rey