Remote control: one to one, and one to many in VB.NET

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Remote control: one to one, and one to many
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automatically load shell extensions and modules and so forth. That doesn t happen when you remote into a computer, so be aware of that. You re still restricted by the remote computer s execution policy. Let s say your local computer s policy is set to RemoteSigned, so that you can run local, unsigned scripts. That s great, but if the remote computer s policy is set to the default, Restricted, it won t be running any scripts for you when you re remoting into it.
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Aside from those two fairly minor caveats, you should be good to go. Oh, wait what do you do when you re done running commands on the remote computer Many PowerShell cmdlets come in pairs, with one cmdlet doing something and the other doing the opposite. In this case, if Enter-PSSession gets you into the remote computer, can you guess what would get you out of the remote computer If you guessed Exit-PSSession, give yourself a prize. The command doesn t need any parameters; just run it and your shell prompt will change back to normal, and the remote connection will close automatically.
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TRY IT NOW Go ahead and exit the remoting session, if you created one.
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We re done with it for now. What if you forget to run Exit-PSSession and instead close the PowerShell window Don t worry. PowerShell and WinRM are smart enough to figure out what you did, and the remote connection will close all by itself. I do have one caution to offer. When you re remoting into a computer, don t run Enter-PSSession from that computer unless you fully understand what you re doing. Let s say you work on Computer A, which runs Windows 7. You remote into Server-R2. Then, at the PowerShell prompt, you run this:
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[server-r2] PS C:\>enter-pssession server-dc4
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Now, Server-R2 is maintaining an open connection to Server-DC4. That can start to create a remoting chain that s hard to keep track of, and which imposes unnecessary overhead on your servers. There are times when you might have to do this I m thinking mainly of instances where a computer like Server-DC4 sits behind a firewall and you can t access it directly, so you use Server-R2 as a middleman to hop over to ServerDC4. But, as a general rule, try to avoid remote chaining. When you re using this one-to-one remoting, you don t need to worry about objects being serialized and deserialized. As far as you re concerned, you re typing directly on the remote computer s console. If you retrieve a process and pipe it to Stop-Process, it ll stop as you would expect it to.
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10.4 Using Invoke-Command for one-to-many remoting
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The next trick and honestly, this is one of the coolest things in Windows PowerShell is to send a command to multiple remote computers at the same time. That s right, full-scale distributed computing. Each computer will independently execute the
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Using Invoke-Command for one-to-many remoting
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command and send the results right back to you. It s all done with the InvokeCommand cmdlet, and it s called one-to-many, or 1:n, remoting.
The command looks something like this:
Invoke-Command -computerName Server-R2,Server-DC4,Server12 -command { Get-EventLog Security -newest 200 | Where { $_.EventID -eq 1212 }}
TRY IT NOW Go ahead and run this command. Substitute the name of your
remote computer (or computers) where I ve put my three computer names. Everything in those outermost curly braces, the {}, will get transmitted to the remote computers all three of them. By default, PowerShell will talk to up to 32 computers at once; if you specified more than that, it will queue them up, so that as one computer completes, the next one in line will begin. If you have an awesome network and powerful computers, you could raise that number by specifying the -throttleLimit parameter of Invoke-Command read the command s help for more information.
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