zoonage / helm-diff

A helm plugin that shows a diff explaining what a helm upgrade would change

Helm Diff Plugin

This is a Helm plugin giving your a preview of what a helm upgrade would change. It basically generates a diff between the latest deployed version of a release and a helm upgrade --debug --dry-run. This can also be used to compare two revisions/versions of your helm release.

Install

Using Helm plugin manager (> 2.3.x)

helm plugin install https://github.com/databus23/helm-diff

Pre Helm 2.3.0 Installation

Pick a release tarball from the releases page.

Unpack the tarball in your helm plugins directory ($(helm home)/plugins).

E.g.

curl -L $TARBALL_URL | tar -C $(helm home)/plugins -xzv

From Source

Prerequisites

• GoLang >= 1.14

Make sure you do not have a verison of helm-diff installed. You can remove it by running helm plugin uninstall diff

Installation Steps

The first step is to download the repository and enter the directory. You can do this via git clone or downloaing and extracting the release. If you clone via git, remember to checkout the latest tag for the latest release.

Next, depending on which helm version you have, install the plugin into helm.

Helm 2

make install

Helm 3

make install/helm3

Usage

The Helm Diff Plugin

* Shows a diff explaining what a helm upgrade would change:
    This fetches the currently deployed version of a release
  and compares it to a local chart plus values. This can be 
  used visualize what changes a helm upgrade will perform.

* Shows a diff explaining what had changed between two revisions:
    This fetches previously deployed versions of a release
  and compares them. This can be used visualize what changes 
  were made during revision change.

* Shows a diff explaining what a helm rollback would change:
    This fetches the currently deployed version of a release
  and compares it to adeployed versions of a release, that you 
  want to rollback. This can be used visualize what changes a 
  helm rollback will perform.

Usage:
  diff [flags]
  diff [command]

Available Commands:
  release     Shows diff between release's manifests
  revision    Shows diff between revision's manifests
  rollback    Show a diff explaining what a helm rollback could perform
  upgrade     Show a diff explaining what a helm upgrade would change.
  version     Show version of the helm diff plugin

Flags:
  -h, --help                   help for diff
      --no-color               remove colors from the output
      --reset-values           reset the values to the ones built into the chart and merge in any new values
      --reuse-values           reuse the last release's values and merge in any new values
      --set stringArray        set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output
  -f, --values valueFiles      specify values in a YAML file (can specify multiple) (default [])
      --version string         specify the exact chart version to use. If this is not specified, the latest version is used

Additional help topics:
  diff          

Use "diff [command] --help" for more information about a command.

Commands:

upgrade:

$ helm diff upgrade -h
Show a diff explaining what a helm upgrade would change.

This fetches the currently deployed version of a release
and compares it to a chart plus values.
This can be used visualize what changes a helm upgrade will
perform.

Usage:
  diff upgrade [flags] [RELEASE] [CHART]

Examples:
  helm diff upgrade my-release stable/postgresql --values values.yaml

Flags:
  -h, --help                   help for upgrade
      --detailed-exitcode      return a non-zero exit code when there are changes
      --post-renderer string   the path to an executable to be used for post rendering. If it exists in $PATH, the binary will be used, otherwise it will try to look for the executable at the given path
      --reset-values           reset the values to the ones built into the chart and merge in any new values
      --reuse-values           reuse the last release's values and merge in any new values
      --strip-trailing-cr      strip trailing carriage return on input
      --set stringArray        set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output
  -f, --values valueFiles      specify values in a YAML file (can specify multiple) (default [])
      --version string         specify the exact chart version to use. If this is not specified, the latest version is used

Global Flags:
      --no-color   remove colors from the output

release:

$ helm diff release -h

This command compares the manifests details of a different releases created from the same chart

It can be used to compare the manifests of

 - release1 with release2
	$ helm diff release [flags] release1 release2
   Example:
	$ helm diff release my-prod my-stage

Usage:
  diff release [flags] RELEASE release1 [release2]

Flags:
  -C, --context int            output NUM lines of context around changes (default -1)
  -h, --help                   help for release
      --home string            location of your Helm config. Overrides $HELM_HOME (default "/home/aananth/.helm")
      --include-tests          enable the diffing of the helm test hooks
      --strip-trailing-cr      strip trailing carriage return on input
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output
      --tls                    enable TLS for request
      --tls-ca-cert string     path to TLS CA certificate file (default "$HELM_HOME/ca.pem")
      --tls-cert string        path to TLS certificate file (default "$HELM_HOME/cert.pem")
      --tls-hostname string    the server name used to verify the hostname on the returned certificates from the server
      --tls-key string         path to TLS key file (default "$HELM_HOME/key.pem")
      --tls-verify             enable TLS for request and verify remote

Global Flags:
      --no-color   remove colors from the output

revision:

$ helm diff revision -h

This command compares the manifests details of a named release.

It can be used to compare the manifests of 
 
 - latest REVISION with specified REVISION
	$ helm diff revision [flags] RELEASE REVISION1
   Example: 
	$ helm diff revision my-release 2

 - REVISION1 with REVISION2
	$ helm diff revision [flags] RELEASE REVISION1 REVISION2
   Example: 
	$ helm diff revision my-release 2 3

Usage:
  diff revision [flags] RELEASE REVISION1 [REVISION2]

Flags:
  -h, --help                   help for revision
      --strip-trailing-cr      strip trailing carriage return on input
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output

Global Flags:
      --no-color   remove colors from the output

rollback:

$ helm diff rollback -h

This command compares the laset manifests details of a named release 
with specific revision values to rollback.

It forecasts/visualizes changes, that a helm rollback could perform.

Usage:
  diff rollback [flags] [RELEASE] [REVISION]

Examples:
  helm diff rollback my-release 2

Flags:
  -h, --help                   help for rollback
      --strip-trailing-cr      strip trailing carriage return on input
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output

Global Flags:
      --no-color   remove colors from the output

Build

Clone the repository into your $GOPATH and then build it.

$ mkdir -p $GOPATH/src/github.com/databus23/
$ cd $GOPATH/src/github.com/databus23/
$ git clone https://github.com/databus23/helm-diff.git
$ cd helm-diff
$ make install

The above will install this plugin into your $HELM_HOME/plugins directory.

Prerequisites

• You need to have Go installed. Make sure to set $GOPATH

Running Tests

Automated tests are implemented with testing.

To run all tests:

go test -v ./...

Release

Set GITHUB_TOKEN and run:

$ make docker-run-release