Question 81469 in Docker Question posted in
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Unable to run PowerShell Write-EventLog within a DOCKERFILE

In my DOCKERFILE I’m running some PowerShell script which creates a custom event log (on Windows Server), then writes an entry. [I should add that I’m currently doing this only for debug purposes.]

The script/command which creates the event log appear to execute without any problems, but an exception is thrown when writing to the log using…

RUN powershell.exe -command Write-EventLog -LogName "my_log_name" -Source "my_source" -Message "EventLog created by DOCKERFILE." -Category 0 -EventID 0 -EntryType Information

The following exception is thrown…

Write-EventLog : A positional parameter cannot be found that accepts argument 
'created'.
At line:1 char:1
+ Write-EventLog -LogName my_log_name -Source my_source -EntryType Messag ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Write-EventLog], Parameter 
   BindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell 
   .Commands.WriteEventLogCommand

I also tried wrapping "EventLog created by DOCKERFILE." in parentheses but then it complained about the word by.

Why does it seem unable to parse "EventLog created by DOCKERFILE." as a string argument, but is instead parsing the words within the string?

UPDATE
Even if I wrap the command in double-quotes and the individual strings in single quotes, I get the same error.

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UPDATE 2
Removing the quotes and escaping the spaces doesn’t work either.

enter image description here

Tags:

2

Answers


  1. 0

    You need to use ` to escape the spaces:

    RUN powershell.exe -command Write-EventLog -LogName my_log_name -Source my_source -Message EventLog` created` by` DOCKERFILE. -Category 0 -EventID 0 -EntryType Information

    See: https://docs.docker.com/engine/reference/builder/#escape

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  2. 0

    This works for me from cmd (except for the unknown source). I’m not sure if docker has issues with single quotes. Double quotes are special in cmd. Note that new-winevent has replaced write-eventlog.

    powershell write-eventLog my_log_name my_source 0 information 'EventLog created by DOCKERFILE.' -category 0
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