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geoffrey1330 authored Oct 17, 2023
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108 changes: 26 additions & 82 deletions docs/content/en/docs/implementing/tasks/_index.md
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Expand Up @@ -123,88 +123,32 @@ a sequence of executables that need to be run in order,
you can put them all in one `KeptnTaskDefinition` resource,
which can execute a virtually unlimited number
of programs, scripts, and functions,
as long as they all need the same runner, such as Python.

Another option is to encode all your steps in the language of your choice
and build a container that Keptn executes.
This is often the best solution if you need to execute complex sequences.

If you use either the `deno-runtime` or `python-runtime` runner,
you can specify the actions to take by coding the actual calls
inline in the manifest,
by calling scripts from a remote webserver,
or by calling other `KeptnTaskDefinition` resources you have defined.
This provides great flexibility in
how you define your `KeptnTaskDefinition` resources,
allowing you to define the ideal mix of executables that run sequentially
and executables (or sets of executables) that run in parallel.

As an example, let's say you need to run a set of integration tests,
a set of performance tests, and a set of regression tests.

- You can create one `KeptnTaskDefinition` that calls all the tasks,
in order, either by putting the actual calls
in the `KeptnTaskDefinition` resource (`inline` syntax)
or by calling scripts from a remote webserver (`httpRef` syntax), or by providing a container to run.

- You can create separate `KeptnTaskDefinition` resources
for integration tests, performance tests, and regression tests.

- If you annotate the `KeptnApp` resource to call
each of these `KeptnTask` resources,
the three sets of tests run in parallel.

- You can create a "parent" `KeptnTaskDefinition` resource
that uses the `functionref` syntax
to call the `KeptnTaskDefinition` resources
for integration tests, performance tests, and regression tests.
If you annotate the `KeptnApp` resource
to run this parent `KeptnTask` resource,
all tests run sequentially.

This approach also allows you to run the test sequence if, for example,
the integration tests require the `deno-runtime` runner
but the performance and regression tests
require the `python-runtime` runner.
The parent `KeptnTaskDefinition` can run `KeptnTask` resources
that use different runners,
although the "parent" definition runtime is used
for the container that runs all the tests.
In other words, the parent `KeptnTaskDefinition` resources
is not a merge of other `KeptnTaskDefinition` resources
but rather the code/container of the parent runner.

- If you need to test your deployment for different platforms
(such as Linux, MacOS, and Windows)
or for different software versions
(such as Java 11, Java 17, and Java 21),
parallel testing can improve performance.
In this case, you can construct different `KeptnTaskDefinition` resources
for each platform,
perhaps defining different input parameters
(such as different secrets or environment variables).

- Define one `KeptnTaskDefinition` resource that runs
integration tests, then regression test, then performance tests
in order.

- You could use the `functionRef` syntax
and code the calling sequences for all tests
inside your `KeptnTaskDefinition` resource
or you could use the `httpRef` syntax
to call scripts from an external webserver.
- You could code separate `KeptnTaskDefinition` resources
for integration tests, regression tests, and performance tests.
These three test sets could then run in parallel.
- You could create a `KeptnTaskDefinition` resource
that uses the `functionRef` syntax to call the
`KeptnTaskDefinition` resources for each type of testing.
Executing that resource would execute the three types of tests
in sequential order.

If you define a `container-runtime` runner container
for your `KeptnTaskDefinition`,
you can do anything allowed by the configuration you define for that container.
as long as they are all using the same runner.
You have the following options:

- Encode all your steps in the language of your choice
and build an image
that Keptn executes in a `container-runtime` runner.
This is often the best solution if you need to execute complex sequences
because it gives you the most flexibility..

- Use the `inline` syntax for one of the Keptn pre-defined runners
(either `deno-runtime` or `python-runtime`)
to code the actual calls inline in the `KeptnTaskDefinition` resource.
See
[Fields for pre-defined containers](../../yaml-crd-ref/taskdefinition.md/#fields-for-pre-defined-containers)
for more information.

- Create a script that calls the functions, programs, and scripts
that need to execute sequentially
and install this on a remote webserver that Keptn can access.
Then use the `httpRef` syntax for one of the pre-defined runners
to call this script from your `KeptnTaskDefinition`,
which can set parameters for the script if appropriate.

For more details about implementing these options, see the
[KeptnTaskDefinition](../../yaml-crd-ref/taskdefinition.md)
page.

## Context

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2 changes: 1 addition & 1 deletion docs/content/en/docs/migrate/strategy/_index.md
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Expand Up @@ -349,7 +349,7 @@ Most functionality coded using the Keptn v1
(Job Executor Service) facility
can simply be moved into a `KeptnTaskDefinition` resource
that uses the
[container-runtime runner](../../yaml-crd-ref/taskdefinition.md/#yaml-synopsis-for-container-runtime).
[container-runtime runner](../../yaml-crd-ref/taskdefinition.md/#synopsis-for-container-runtime).
If the JES container code is written in JavaScript or TypeScript,
you may be able to use the `deno-runtime` runner.
If the JES container code is written in Python 3,
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