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need to create a text file called allservers.txt. I put it in the root of my C: drive (because that s where I have PowerShell focused for these examples), and I put several computer names in the file, listing one name per line. You can list your computer name and localhost to duplicate the results I m showing you.
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PS C:\> get-wmiobject win32_operatingsystem -computername (get-content allservers.txt) -asjob WARNING: column "Command" does not fit into the display and was removed. Id -5 Name ---Job5 State ----Running HasMoreData ----------False Location -------server-r2,lo...
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This time, the shell will create one top-level parent job (Job5, which is shown in the output of the command), and it will create one child job for each computer that you specified. You can see that the Location column in the output table lists as many of the computer names as will fit, indicating that the job is going to be running against those computers. It s important to understand that Get-WmiObject is executing only on your computer; the cmdlet is using normal WMI communications to contact the remote computers that you specified. It will still do so one at a time and follow the usual defaults of skipping computers that aren t available, and so forth. In fact, it works identically to using Get-WmiObject synchronously, except that the cmdlet runs in the background. There are a few commands other than Get-WmiObject that can start a job. Try running Help * -parameter asjob to see if you can find them all.
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12.5 Remoting, as a job
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The last way to create a new job is to use PowerShell s remoting capabilities, which you learned about in chapter 10. As with Get-WmiObject, you start this kind of job by adding an -AsJob parameter, but this time you ll add it to the Invoke-Command cmdlet. There s an important difference here: whatever command you specify in the -scriptblock (or -command, which is an alias for the same parameter) will be transmitted in parallel to each computer that you specified. Up to 32 computers will be contacted at once (unless you modify the -throttleLimit parameter to allow more or fewer), so if you specify more than 32 computer names, only the first 32 will start. The rest will start after the first set begins finishing, and the top-level job will show a completed status after all of the computers are finished. Unlike the other two ways of starting a job, this one requires that PowerShell v2 be installed on each target computer, and that each target computer have PowerShell
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remoting enabled. Because the command physically executes on each remote computer, you re distributing the computing workload, which can help improve performance for complex or long-running commands. The results come back to your computer and are stored with the job until you re ready to review them. Here s an example, where you ll also see the -JobName parameter that lets you specify a job name other than the boring default:
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PS C:\> invoke-command -command { get-process } -computername (get-content .\allservers.txt ) -asjob -jobname MyRemoteJob WARNING: column "Command" does not fit into the display and was removed. Id -8 Name ---MyRemoteJob State ----Running HasMoreData ----------True Location -------server-r2,lo...
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12.6 Getting job results
The first thing you ll probably want to do is check to see if your jobs have finished. The Get-Job cmdlet will retrieve every job currently defined by the system, and show you each one s status:
PS C:\> get-job Id -1 3 5 8 Name ---Job1 Job3 Job5 MyRemoteJob State ----Completed Completed Completed Completed HasMoreData ----------True True True True Location -------localhost localhost server-r2,lo... server-r2,lo...
You can also retrieve a specific job, either by using its ID or its name. I suggest that you do that and pipe the results to Format-List *, because you ve gathered some valuable information:
PS C:\> get-job -id 1 | format-list * State HasMoreData StatusMessage Location Command JobStateInfo Finished InstanceId Id Name ChildJobs Output Error : : : : : : : : : : : : : Completed True localhost dir Completed System.Threading.ManualResetEvent e1ddde9e-81e7-4b18-93c4-4c1d2a5c372c 1 Job1 {Job2} {} {}
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