Troubleshooting .NET configuration transforms

If you’re new to .NET configuration transformation, first check the package(s) part of the deployment are structured and contain what you expect. Following on from that review the deployment logs and output of the package(s) on your deployment targets to get investigate any unexpected behavior. You can try using the Octopus.Action.Package.TreatConfigTransformationWarningsAsErrors variable defined in the System Variables section of the documentation while you set it up the first time.

Advanced .NET configuration transforms examples

.NET Configuration transforms can sometimes be complicated to setup. As a general rule, its best to have both configuration file and transform file in the same directory, however, this is not always achievable.

This page lists the supported scenarios and the transform definitions required to apply the transform.

Supported scenarios

		Target
		Absolute Path	Relative Path	Filename	Wildcard Prefixed Absolute Path	Wildcard Prefixed Relative Path	Wildcard Prefixed Filename
Transform	Absolute Path	not supported	not supported	Example	not supported	Example	Example
	Relative Path	not supported	Example	Example	not supported	Example	Example
	Filename	not supported	Example	Example	not supported	Example	Example
	Wildcard Absolute Path	not supported	not supported	Example	not supported	Example	Example
	Wildcard Relative Path	not supported	Example	Example	not supported	Example	Example
	Wildcard Filename	not supported	Example	Example	not supported	Example	Example

Transform and target are in the same directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─web.config
└─web.mytransform.config

Then the transform web.mytransform.config => web.config will:

• Apply the transform web.mytransform.config to file web.config.

Applying a transform against a target in a different folder

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| └─web.config
└─web.mytransform.config

Then the transform web.mytransform.config => config\web.config will:

• Apply the transform web.mytransform.config to file config\web.config.

Transform and multiple targets are in the same directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.config
├─connstrings.mytransform.config
└─web.config

Then the transform connstrings.mytransform.config => *.config will:

• Apply the transform connstrings.mytransform.config to file web.config.
• Apply the transform connstrings.mytransform.config to file app.config.

Applying a transform against multiple targets in a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| ├─app.config
| └─web.config
└─connstrings.mytransform.config

Then the transform connstrings.mytransform.config => config\*.config will:

• Apply the transform connstrings.mytransform.config to file config\web.config.
• Apply the transform connstrings.mytransform.config to file config\app.config.

Using an absolute path to the transform

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─subdir
| └─web.config
└─web.config

And the following files exist:

c:\
└─transforms
  └─web.mytransform.config

Then the transform c:\transforms\web.mytransform.config => web.config will:

• Apply the transform c:\transforms\web.mytransform.config to file web.config.
• Apply the transform c:\transforms\web.mytransform.config to file subdir\web.config.

Applying a transform with an absolute path to a target in the extraction path root

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─subdir
| └─web.config
└─web.config

And the following files exist:

c:\
└─transforms
  └─web.mytransform.config

Then the transform c:\transforms\web.mytransform.config => .\web.config will:

• Apply the transform c:\transforms\web.mytransform.config to file web.config.

Applying a transform with an absolute path to a target relative to the extraction path

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─subdir
| └─web.config
└─web.config

And the following files exist:

c:\
└─transforms
  └─web.mytransform.config

Then the transform c:\transforms\web.mytransform.config => .\subdir\web.config will:

• Apply the transform c:\transforms\web.mytransform.config to file subdir\web.config.

Applying a transform with an absolute path against multiple files in a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
└─config
  ├─app.config
  └─web.config

And the following files exist:

c:\
└─transforms
  └─connstrings.mytransform.config

Then the transform c:\transforms\connstrings.mytransform.config => config\*.config will:

• Apply the transform c:\transforms\connstrings.mytransform.config to file config\web.config.
• Apply the transform c:\transforms\connstrings.mytransform.config to file config\app.config.

Using an absolute path to the transform, and applying it against multiple files

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.config
└─web.config

And the following files exist:

c:\
└─transforms
  └─connstrings.mytransform.config

Then the transform c:\transforms\connstrings.mytransform.config => *.config will:

• Apply the transform c:\transforms\connstrings.mytransform.config to file web.config.
• Apply the transform c:\transforms\connstrings.mytransform.config to file app.config.

Applying a transform from a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─transforms
| └─web.mytransform.config
└─web.config

Then the transform transforms\web.mytransform.config => web.config will:

• Apply the transform transforms\web.mytransform.config to file web.config.

Applying a transform to a target in a sibling directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| └─web.config
└─transforms
  └─web.mytransform.config

Then the transform transforms\web.mytransform.config => config\web.config will:

• Apply the transform transforms\web.mytransform.config to file config\web.config.

Applying a transform from a different directory against multiple files

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.config
├─transforms
| └─connstrings.mytransform.config
└─web.config

Then the transform transforms\connstrings.mytransform.config => *.config will:

• Apply the transform transforms\connstrings.mytransform.config to file web.config.
• Apply the transform transforms\connstrings.mytransform.config to file app.config.

Applying a transform to multiple targets in a sibling directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| ├─app.config
| └─web.config
└─transforms
  └─connstrings.mytransform.config

Then the transform transforms\connstrings.mytransform.config => config\*.config will:

• Apply the transform transforms\connstrings.mytransform.config to file config\web.config.
• Apply the transform transforms\connstrings.mytransform.config to file config\app.config.

Applying multiple transforms to a single target where both are in the same directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─connstrings.mytransform.config
├─security.mytransform.config
└─web.config

Then the transform *.mytransform.config => web.config will:

• Apply the transform security.mytransform.config to file web.config.
• Apply the transform connstrings.mytransform.config to file web.config.

Wildcard transform with wildcard in the middle of the filename to a single target where both are in the same directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─MyApp.connstrings.octopus.config
├─MyApp.nlog_octopus.config
└─MyApp.WinSvc.exe.config

Then the transform MyApp.*.octopus.config => MyApp.WinSvc.exe.config will:

• Apply the transform MyApp.connstrings.octopus.config to file MyApp.WinSvc.exe.config.

Applying multiple transforms to a single target in a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| └─web.config
├─connstrings.mytransform.config
└─security.mytransform.config

Then the transform *.mytransform.config => config\web.config will:

• Apply the transform security.mytransform.config to file config\web.config.
• Apply the transform connstrings.mytransform.config to file config\web.config.

Applying multiple transforms against multiple targets

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.config
├─app.mytransform.config
├─web.config
└─web.mytransform.config

Then the transform *.mytransform.config => *.config will:

• Apply the transform web.mytransform.config to file web.config.
• Apply the transform app.mytransform.config to file app.config.

Applying multiple transforms against multiple targets in a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.mytransform.config
├─config
| ├─App.config
| └─web.config
└─web.mytransform.config

Then the transform *.mytransform.config => config\*.config will:

• Apply the transform web.mytransform.config to file config\web.config.
• Apply the transform app.mytransform.config to file config\app.config.

Applying multiple absolute path transforms to the same target file

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─subdir
| └─web.config
└─web.config

And the following files exist:

c:\
└─transforms
  ├─connstrings.mytransform.config
  └─security.mytransform.config

Then the transform c:\transforms\*.mytransform.config => web.config will:

• Apply the transform c:\transforms\connstrings.mytransform.config to file web.config.
• Apply the transform c:\transforms\security.mytransform.config to file web.config.
• Apply the transform c:\transforms\connstrings.mytransform.config to file subdir\web.config.
• Apply the transform c:\transforms\security.mytransform.config to file subdir\web.config.

Using an absolute path wildcard transform and multiple targets

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.config
├─subdir
| ├─app.config
| └─web.config
└─web.config

And the following files exist:

c:\
└─transforms
  ├─app.mytransform.config
  └─web.mytransform.config

Then the transform c:\transforms\*.mytransform.config => *.config will:

• Apply the transform c:\transforms\web.mytransform.config to file web.config.
• Apply the transform c:\transforms\app.mytransform.config to file app.config.
• Apply the transform c:\transforms\web.mytransform.config to file subdir\web.config.
• Apply the transform c:\transforms\app.mytransform.config to file subdir\app.config.

Using an absolute path for multiple transforms against multiple relative files

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
└─config
  ├─app.config
  └─web.config

And the following files exist:

c:\
└─transforms
  ├─app.mytransform.config
  └─web.mytransform.config

Then the transform c:\transforms\*.mytransform.config => config\*.config will:

• Apply the transform c:\transforms\web.mytransform.config to file config\web.config.
• Apply the transform c:\transforms\app.mytransform.config to file config\app.config.

Applying multiple relative transforms against a specific target

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─transforms
| ├─connstrings.mytransform.config
| └─security.mytransform.config
└─web.config

Then the transform transforms\*.mytransform.config => web.config will:

• Apply the transform transforms\connstrings.mytransform.config to file web.config.
• Apply the transform transforms\security.mytransform.config to file web.config.

Applying multiple transforms in a different directory to a single target in a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| └─web.config
└─transforms
  ├─connstrings.mytransform.config
  └─security.mytransform.config

Then the transform transforms\*.mytransform.config => config\web.config will:

• Apply the transform transforms\connstrings.mytransform.config to file config\web.config.
• Apply the transform transforms\security.mytransform.config to file config\web.config.

Applying transforms from a different directory to multiple targets

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─app.config
├─transforms
| ├─app.mytransform.config
| └─web.mytransform.config
└─web.config

Then the transform transforms\*.mytransform.config => *.config will:

• Apply the transform transforms\web.mytransform.config to file web.config.
• Apply the transform transforms\app.mytransform.config to file app.config.

Applying transforms from a different directory to targets in a different directory

Given a package which has the structure:

Acme.Core.1.0.0.nupkg
├─config
| ├─app.config
| └─web.config
└─transforms
  ├─app.mytransform.config
  └─web.mytransform.config

Then the transform transforms\.mytransform.config => config\.config will:

• Apply the transform transforms\web.mytransform.config to file config\web.config.
• Apply the transform transforms\app.mytransform.config to file config\app.config.

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Page updated on Sunday, January 1, 2023