How to achieve no-downtime solution deployment on farms with multiple WFEs and LB

Taking SharePoint Solution Deployer, my opensource PowerShell deployment script, to the next level,
Bill Simser got me the idea of making the deployment even more smooth on farms with multiple WFEs and load balancer in order to achieve a no-downtime deployment
The basic idea is to deploy the solutions on each WFEs one-by-one by
1. Taking one WFE offline
2. Installing the solution with the -local switch
//Solution deployment
Install-SPSolution -Identity <solutionname>.wsp –GACDeployment –CASPolicies –Local
// Solution upgrade
Update-SPSolution -Identity <solutionname>.wsp -LiteralPath LocalPathOfTheSolution.wsp -GacDeployment -Local
3. Run post-deployment actions on the WFE (ie. restart services, recycle apppools or IIS reset, warmup server), which my script already does for each server
4. Take WFE online again
5. Repeat step 1-4 for all other WFEs
I am struggling with three things here:
1. The whole deployment process could be quite risky when something goes wrong in between. And in order to roll back I would require the original solution if it was already deployed before (which I can back up of course before I replace
it)
Anything which involves changing the content dbs should of course be done after the solutions is deployed to the whole farm, so this should not hurt in this case.
Anyway MSDN says that the "DeployLocal" method (which I assume is the same as the -local switch in PS ) should be only used
for
troubleshooting purposes.
So it would be great to hear about anyones experiences with it
2. As there can be different types of load balancers (hardware, software) which might not be configurable through my script I assume that taking out the WFE from the the load balancer may not always be possible.
So I thought about just taking the server offline.
I haven't found an option yet to take only one server in the farm offline (without removing it from the farm of course), so maybe I miss something. Any ideas?
3. Before taking a single WFE offline, I would like to assure that this server does not have any open sessions, operations of users ongoing. Unfortunately I found only the possibility to quiesce the whole farm, but not a single
server. Am I missing something?
Appreciate any ideas which might point me in the direction to solve the overall goal!
SharePoint Architect, Speaker, MCP, MCPD, MCITP, MCSA, MCTS, Scrum Master/Product Owner
Blog: www.matthiaseinig.de, Twitter:
@mattein
CodePlex: SharePoint Software Factory,
SharePoint Solution Deployer

Hi Mike,
unfortunately not. I tried several different approaches but didn't really success reliably with any of them. So eventually I gave up on it.
Interesting idea though that Eric Hasley is commenting on the blog post you mentioned.
"There is another approach that has worked for me in the past. Because the deployment to each server is handled through a timer job,
by stopping the timer service in a controlled fashion you can rollout your solution without incurring any user outage."
It could work like that (in theory).
Stop the SPTimerV4 on all servers in the farm apart from one.
Take out the one to deploy to from the NLB
Wait until it has no connections
Deploy the solutions on it in the ordinary way (eg. with my
SharePoint Solution Deployer ;))
Put it back into the NLB and take the others out
Wait until they have no connections left
Activate the timer service on the others servers and let them deploy
Put them back into the NLB
No clue if this is actually working and you still have the problem with the NLB, so it could take a while.
Also I am not certain what happens in state 5 if users use different versions of your solutions at the same time (old version on the remaining open connections, new version on the updated server)
I do not have a suitable farm at hand to play with it though, so can't test it.
Cheers
Matthias
Matthias Einig, CEO, SharePoint MVP
Blog: www.matthiaseinig.de, Twitter:
@mattein
Projects: SharePoint Code Analysis Framework (SPCAF),SharePoint Code Check (SPCop),
SharePoint Software Factory,
SharePoint Solution Deployer

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