Re: VSS best practice for promoting code to production?
- From: David <David@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 8 Oct 2007 09:56:02 -0700
Mike,
Thanks so much for your reply. To clear up any confusion - SMB/CIFS stands
for Server Message Block/Common Internet File System... basically a shared
folder in Windows. MSB was a typo on my part...
This is very helpful... and we do have the 3 tier environment... developers
code on thier local machines initially... then move it to QA for testing, and
then to production...
Thanks for the input...
David
"Mike" wrote:
I'll tell you what I've seen done at some companies I've worked at,.
then I'll tell you how I think we SHOULD be doing it. But first,
you've used a lot of TLAs and FLAs (Three Letter Acronyms and Four
Letter Acronyms), not all of which I'm familiar and some have too many
uses that I can't be sure which you mean (and I don't have the time to
study each definition to find the right context):
CIFS has at least 7 definitions (OK, I can figure which one you mean
here :)
http://www.acronymfinder.com/af-query.asp?Acronym=cifs&string=exact
MSB has at least 37 definitions:
http://www.acronymfinder.com/af-query.asp?Acronym=msb&Find=find&string=exact
SMB has at least 33 definitions:
http://www.acronymfinder.com/af-query.asp?Acronym=smb&string=exact
So, I'll refrain from pretending that I'm smarter than I am by not
pretending that I know what you're talking about in your TLAs and
instead focus on the primary gist of your question regarding best
practices for moving code from VSS to production:
Here's what I've seen in real life pratice:
1. When we've got code that's a release candidate, we developers
might label it in VSS, then we will move it from our dev environment
to our staging environment (done by a SysAdmin, not a developer, for
security reasons).
2. After the testers shake it out and determine that it's production
ready, we invoke our SysAdmins again to move it from staging to
production.
3. The developer may (or might not) label it again as a production
release in VSS.
In short, actual practice at companies I've worked at is that only the
developers actually touch VSS. They then label it (if they feel so
inclined) as it moves along the path to production. Some developers
don't even check it in on each release. I've not worked at a company
that has strict rules on this, but I think it should be a requirement
that whenever you release anything to staging or production, you
should, at the very least, check it in and label it as such.
Here's what I recommend:
First, the run-time environments:
There should be at least 3 run-time environments:
1. Development Environment. This can be either the developer's own
workstation or an environment that duplicates production's
environment. The developer uses this day in and day out during the
development process. Code begins here.
2. Staging/Testing/QA Environment: Code is moved from dev to staging
for user acceptance and testing.
3. Production: Tested and approved code moves from staging to here
where it will live it's life.
Second, the VSS environments:
1. One for developers.
- Read/Write access by devs.
- Read Only by SysAdmins.
2. One for SysAdmins.
- Read/Write by SysAdmins.
- Read Only by devs (if at all).
I'll explain these later.
Third, a security model: There should be a security wall between
developers and production and between the developers VSS and the
SysAdmin's VSS. This means that developers should not have direct
access to anything in production. This helps prevent dev's with a
grudge or ill intent of any kind from inserting malicious code into
production (I've seen this happen many times, usually as a back
door). Of course, this won't totally block it, but it helps. This
also protects developers (which is why I'm so in favor of it) from
blame if the code in production is different than what was tested.
Security on each run-time environment:
- Development: Developer(s) have total access.
- Staging: SysAdmins have access and developers are blocked (read
only would seem to be OK, but they shouldn't see the DB connection
strings).
- Production: SysAdmins have access and developers are blocked.
The flow of coding goes like this:
1. Developer checks out latest code and writes code and tests in
development environment. When the developer is ready for users to test
it, he checks it into the developers VSS db, labels it, and submits
the VSS labeled version to the SysAdmin(s) to move it into staging.
This is the only point in which anyone other than the developer
touches the developer's VSS DB.
2. The SysAdmin performs a get version from the developer's VSS.
He'll also check out the latest version from the SysAdmin's VSS
database (not to get the files from it, but to make the project
"checked out"). Then he checks into the SysAdmin's VSS database what
he just got out of the developer's VSS db. Depending on the
complexity of the project and the amount of changes, he may do a
version comparison. Whether he does it or not, the developer knows he
can and is less likely to insert malicious code.
3. The SysAdmin then publishes that code into the staging environment
and the developer notifies his testers of the new code to be tested.
4. After the testers have accepted the new changes, notification is
sent to the SysAdmin that the staging code is ready for production.
At that point, the SysAdmin simply moves the code from staging to
production and re-label's the SysAdmin's VSS DB project. Optionally,
the SysAdmin can inform the developer that the code is in production
and the developer can relabel his VSS db project as well.
This is basically a collection of the best of the best practices I've
seen in the various companies I've worked for with a few sprinkles of
some of my own suggestions.
In short, I would NEVER move code directly from a developer into
production, which means not moving directly from the developer's VSS
straight into production. There should always be a testing/evaluation
process on the developer's code before it makes it to production. In
other words, never take any code from a developer at face value. And
I say that as a developer. I want others signing off on the code.
Hope that helps!
--------------------------
Owner/Operator of
www.MichaelsAttic.com
On Oct 5, 12:49 pm, David <Da...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi all -
I have a question. We are starting to build out our ecommerce and web
services offerings. I am the admin responsible for all of our servers, and I
gotta say, right now our process for promoting code to production is a little
sily. The developers will make a copy of thier code (asp, asp.net, whatever)
and email the files to thier manager who will then access a CIFS share on the
server to post the files.
Not to be a control freak, but I am really not comfortable with this. I
would like to see us improve this process, so I am curious how some of you
might handle this in your shops? I think about having a specific "promotion"
user in the VSS system so that we can check out the latest files right to the
production systems? But we are on VSS 6, which uses standard SMB/CIFS shares
to access, right? I just hate to poke MSB/CIFS holes in our firewall - even
if it is just from our dmz to our private lan...
Any thoughts or advice is greatly appreciated!
David
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