Re: [Fab-user] Moving to Fab ?

[Christian Vest Hansen]

Hello.

I think Jeff is right on the money with his reply, and I really just
wanted to comment on this:

On Thu, Nov 6, 2008 at 5:40 PM, Jeff Forcier <address@hidden> wrote:
> The main thing Fabric is missing that you seem to rely on is your
> "environments" and "tags", which sound similar to an item on our todo
> list, namely implementing a way to group servers together (something
> Capistrano refers to as 'roles'). We also do not have a baked-in
> concept of environments, but it's easy enough right now to implement
> them (I believe the current docs explore this somewhat, IIRC).

I wrote a sample at some point to explore this a little, and this
discussion had me take a look at it again.

Turns out it was horribly broken... but, but but! I think I discovered
a neat and low-impact way of fixing it up and make it work. Not sure
if its too hacky, though. I'll post a patch in a minute and see if
people have opinions.

>
> Regards,
> Jeff
>
> On Wed, Nov 5, 2008 at 12:33 PM, Nicolas Steinmetz <address@hidden> wrote:
>> Hello,
>>
>> I'm currently testing Fab in order to evaluate it to see if it can replace a
>> home made perl script that my firm use for deployment but that I cannot
>> maintain or improve due to my lack of perl skills.
>>
>> It has following features
>> - Handle environnement server (one file per environnement)
>> - For a given environnement, I can set "tags", like "front" for front server
>> and "db" for db servers. For each tag, I can set one or more servers.
>>
>> Example for my ezpupdate/etc/prod file :
>> tags: front db
>> front: www1 www2 www3
>> db: sql1
>>
>> In a given archive for a deployment, I have the following structure :
>>
>> files/
>> files/front
>> files/db
>> changes/
>> changes/front
>> changes/db
>> commands.upd
>>
>> -> files is used for files to be sent. Then "front" and "db" are the tags
>> that match the tags defined above.
>>
>> For ex, if I want to update a new httpd.conf, my.cnf, and index.php files, I
>> will have :
>> files/front/etc/httpd/httpd.conf
>> files/front/var/www/project/index.php
>> files/db/etc/my.cnf
>>
>> -> changes are to be considered as a kind of patch. Accoding to some
>> pattern, I'm able to add/change/modifiy/withdraw a line in a given file.
>> Just think it as sed . Same principe for front/tag tags.
>>
>> -> commands.upd is a file which gather some commandes to run, once files and
>> changes have been applied. It can run local and remote commands and it can
>> even run a commande once for a given tag.
>>
>> For ex, if I want to update the crontab of the first server in the list and
>> not all of them :
>> remote front once cd /var/www/projet && update_crontab.sh
>>
>> Process of deployment is the following one :
>> I run : myscript -target=<envt> -source=<archive>
>>
>> then it does the following :
>> - create a log file
>> - unpack archive in /tmp on my local computer (from which I deploy the
>> package on my remote servers)
>> - send files on relevant servers according to tag
>> - apply changes with some ssh $srv "sed like command"
>> - execute remote / local commandes in commands.upd
>> - end log file
>>
>> In parallel, I started trying to implement fab on my own but I'd like to
>> have your feedback on my current tool vs fab (0.0.9). My first thought is
>> that Fab is based on the opposite principe (or maybe I'm wrong due the
>> examples I saw), that is to say  to send archives on the remote server and
>> then to execute remote scripts. Whereas in my case, I'm more on the
>> principle : I handle locally files, send them to remote computers and
>> execute script from deployment server (not sure I'm clear).
>>
>> Thanks for reading me, I hope I'm clear enough and looking forward reading
>> your feedback on this.
>>
>> Nicolas
>>
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>>
>>
>
>
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-- 
Venlig hilsen / Kind regards,
Christian Vest Hansen.