Deploying multiple applications to a single environment?

[Darryl Weaver]

Thank you Marco,
What an excellent and complete answer :)

Best Wishes,

Darryl Weaver
Sales Engineer,
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On 12/11/12 21:42, Marco Ceppi wrote:
> The answer is yes. So there's several ways to tackle this within the
> scope of Juju. You can deploy multiple "application stacks" to a single
> environment and still have them separated, while it's not necessary, if
> a requirement was to have a loadbalancer, WordPress, and MySQL separated
> from another loadbalancer, Limesurvey, and MySQL server you could do
> that in the same environment like so:
> 
> juju deploy <loadbalancer> wp-lb
> juju deploy <loadbalancer> lime-lb
> // Where loadbalancer is something like squid, haproxy, varnish, etc [1]
> juju deploy wordpress
> juju deploy limesurvey
> juju deploy mysql wp-mysql
> juju deploy mysql lime-mysql
> 
> Since you can provide aliases to services in Juju enironments you can
> deploy one charm multiple times under different names. Now you can
> continue with the set up as you normally would, only using aliases:
> 
> juju add-relation wp-lb wordpress
> juju add-relation wordpress wp-mysql
> juju expose wp-lb
> 
> juju add-relation limesurvey lime-lb
> juju add-relation limesurvey lime-mysql
> juju expose lime-lb
> 
> Now you have two application stacks in the same environment but still
> separated from each other. You can mix and match this as you see if,
> adding a relation from MySQL to multiple services is fine (and expected
> in the charm) MySQL will simply create a database per service connected.
> 
> I like to think of environments as levels of access for people. So if
> you have one team that needs access to a certain stack of applications
> I'd create that environment for them, whereas another team might need
> access to different stacks, so they'd just be deploying to a different
> environment to manage their stacks. There's really no problem with
> deploying arbitrary services in an environment whether they're related
> to each other or not it makes no difference to juju.
> 
> Thanks,
> Marco Ceppi
> 
> [1]: http://jujucharms.com/interfaces/http
> 
> On 11/12/2012 04:20 PM, Darryl Weaver wrote:
>> Hi All,
>>
>> So, here is an interesting question about deploying multiple
>> applications.  This is a question about best practises.
>>
>> Say, I am a system administrator who wants to deploy many similar web
>> applications.  But I want each one to have it's own environment on
>> different servers and all deployed using Juju, for performance, security
>> and DR reasons.
>>
>> So, for example, I would like to have a wordpress app node and mysql
>> database node (for wordpress only) and a load balancer (for wordpress
>> only), but I also want to have another application, such as limesurvey
>> app, db server and load balancer.
>>
>> So, do I create multiple environments to contain each of my applications
>> or do I deploy to the same environment?
>>
>> If I am deploying to the same environment, how do I specify separation
>> between applications and relationships between specific instances?
>>
>> Thanks in advance for any advice,
>>
> 
>