Tuesday, April 16, 2013

[Servers] Extensible (Powershell) Repository - just add scripts!

(Version 1.1. I so should've posted this earlier - looks like everybody has been releasing their version of this idea over the past week).


Over the past few months, we've been working on knowing more about our servers.  Besides sp_blitz, there's a lot of data we want: DMVs, WMI info, etc. So a coworker & I had a challenge going - which would be a faster way to query our 80+ production servers, SSIS or PowerShell?  Well, he had it running faster, but then I asked him to up the number of simultaneous threads and it was a chore for him to change.  For me, alter a line of code in a text file.  And it seemed easier for me to add more scripts.

So I decided to make mine, while not (necessarily) the fastest, the easiest to use.  It uses Powershell and some PS scripts originally written by Chad Miller, Arnoud Jansveld, and several other people smarter than me.  I just put it all together.

TL;DR: Drop a query in a folder, and it runs several threads in parallel against all your servers, saving the details out to a table, overwriting the old data if you want.

Pros:

  • Trivial install - 6 scripts in a folder, a table with a list of servers, 1 or 2 empty subfolders, and 1 job.
  • Low overhead - a sample (simple) script ran on 80+ servers in under 6 seconds.
  • Easy to add a new collection - just drop a SQL/PS script in the folder with the name for the table.
  • Need more servers done faster?  Up the threads.
  • Skips servers it can't connect to.
  • No powershell extensions needed - just those 6 scripts.  PS3 below, modify the one line for PS2.


Cons:

  • Does not deploy code; just runs scripts. (so sp_blitz, for instance, needs to be installed separately)
  • No failure info. That's on my to-do list, but is not nearly as easy as I'd like
  • Datatypes for new tables need to be tweaked if the script creates the table - text fields default to varchar(1000)



To install:
  • Create a table with a list of servers to monitor.
  • Create 3 folders: c:\sql_tools (or wherever; change the actual script's foldername), and underneath it one for scripts where you want to keep the data, and one where you don't.
  • Grab add-sqltable.ps1, write-datatable.ps1, and invoke-sqlcmd2.ps1 from Hey Scripting Guy or poshcode. Put in c:\sql_tools.
  • Save the below script to a file called "repository_extensible.ps1", in c:\sql_tools.
  • Create a job with 2 job steps, both as Type: "Operating System (CmdExec)":
    • powershell "& c:\sql_tools\repository_extensible.ps1 c:\sql_tools\repository_scripts_keep 0"
    • powershell "& c:\sql_tools\repository_extensible.ps1 c:\sql_tools\repository_scripts_delete 1"
    • The first script runs scripts where each time, records will be added to the table.  The second will delete records from each server, replacing it with the new records. 
  • Toss a couple sample scripts in the folders 
  • Run the job once.
  • Go into your repository database and modify the table; by default strings automatically become varchar(1000).  Yes, it's not great, but will work for now.

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