英文:
Remote variable
问题
我遇到了将变量传递到远程 PowerShell 会话的问题，我已经在互联网上搜索了我能想到的所有地方，所以希望有人能帮助我。
我有一个函数调用一个作业，告诉它启动一个脚本块。
我试图做的是编写一个脚本，允许我从一个虚拟机故障切换到另一个虚拟机。如果所有内容都是硬编码，它可以正常工作，但这意味着我必须为每次故障切换更改脚本，这根本不会节省我的时间。
$Computer = Server1
$Clustergrp = Cluster1
function FAILOVER(){
$job = Start-Job -scriptblock $JobScript
do {[System.Windows.Form.Application]::DoEvent() } until ($Job.State -eq "Completed")
}
$JobScript =
{
Invoke-Command -ComputerName $using:Computer -ScriptBlock {Move-ClusterGroup -Name $using:Clustergrp}
}
我在这里漏掉了什么？请帮忙！
我尝试过使用参数和 $using:variable，但似乎什么都不起作用。但如果我在脚本块中硬编码所有内容，它每次都能正常工作。
我还尝试过只使用 -ComputerName $Computer -ScriptBlock{.....}，但也不起作用。
英文:
I am having an issue with passing variables to a remote powershell session and I've searched everywhere on the internet I can think of so I'm hoping someone out there can help.
I have a function calling a job which is telling it to start a scriptblock
What I'm trying to do is write a script to allow me to failover clusters from one VM. It works fine if everything is hardcoded but that means I have to change the script for every failover and that just won't save me anytime at all.
$Computer = Server1
$Clustergrp = Cluster1
function FAILOVER(){
$job = Start-Job -scriptblock $JobScript
do {[System.Windows.Form.Application]::DoEvent() } until ($Job.State -eq "Completed")
$JobScript =
{
Invoke-Command -ComputerName $using:Computer -ScriptBlock {Move-ClusterGroup -Name $using:Clustergrp}
}
What am I missing here? Help please!
I've tried using arguments and $using:variable but nothing seems to work. Yet if I hardcode everything in the scriptblock it works everytime.
I've also tried just using -ComputerName $Computer -ScriptBlock{.....} but that didn't work either.
答案1
得分: 1
<!-- language-all: sh -->
**_通用_ 知识点:**
* [`Invoke-Command`](https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Core/Invoke-Command) 有一个 `-AsJob` 参数，因此无需首先使用 `Start-Job` 创建作业。
* 若要等待作业完成，使用 [`Wait-Job`](https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Core/Wait-Job) 命令。
* 如果要立即等待，即要进行 _同步_ 执行，只需省略 `-AsJob`。
* 请注意，`Invoke-Command` 的 `-ComputerName` 参数接受一个 _计算机名称数组_，然后会 _并行_ 定向这些计算机。
---
至于 **你尝试了什么**：
你正在 _嵌套_ 两个运行空间外（进程外）的范围，这也需要嵌套使用 [`$using:` 范围](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_remote_variables#using-remote-variables):
$Computer = 'Server1'
$Clustergrp = 'Cluster1'
$JobScript = {
从调用者的 $Clustergrp 值创建一个 本地 变量，以便在远程执行的 Invoke-Command 脚本块中再次使用 $using: 引用。
$Clustergrp = $using:Clustergrp
Invoke-Command -ComputerName $using:Computer -ScriptBlock {
Move-ClusterGroup -Name $using:Clustergrp
}
}
function FAILOVER {
$job = Start-Job -ScriptBlock $JobScript
$job | Wait-Job
}
英文:
<!-- language-all: sh -->
General points:
-
Invoke-Commandhas an-AsJobparameter, so there's no need for creating a job withStart-Jobfirst. -
To wait for a job's completion, use the
Wait-Jobcmdlet. -
If you want to wait right away, i.e. if you want synchronous execution to begin with, simply omit
-AsJob.- Note that
Invoke-Command's-ComputerNameparameter accepts an array of computer names that are then targeted in parallel.
- Note that
As for what you tried:
You're nesting two out-of-runspace (out-of-process) scopes, which also requires nesting the use of the $using: scope:
$Computer = 'Server1'
$Clustergrp = 'Cluster1'
$JobScript = {
# Create a *local* variable from the caller's
# $Clustergrp value, so it can again be referenced with
# $using: in the remotely executing Invoke-Command script block.
$Clustergrp = $using:Clustergrp
Invoke-Command -ComputerName $using:Computer -ScriptBlock {
Move-ClusterGroup -Name $using:Clustergrp
}
}
function FAILOVER {
$job = Start-Job -ScriptBlock $JobScript
$job | Wait-Job
}
答案2
得分: 0
Invoke-Command -ComputerName $using:Computer -ArgumentList $arg1 -ScriptBlock {param($arg) Move-ClusterGroup -Name $arg[0]}
英文:
Invoke-Command -ComputerName $using:Computer -ArgumentList $arg1 -ScriptBlock {param($arg) Move-ClusterGroup -Name $arg[0]}
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