lithops.md

copyright	lastupdated	keywords	subcollection
years 2022	2022-06-13	lithops and code engine, lithops framework and code engine, Python and code engine, iam api key when using lithops for code engine, jobs in lithops framework with code engine, batch jobs in lithops framework with code engine, lithops, jobs	codeengine

{{site.data.keyword.attribute-definition-list}}

Running jobs with Lithops framework

{: #lithops}

Lithops is an open source framework that designed to massively scale your Python applications. Lithops provides a simple push to the {{site.data.keyword.codeenginefull}} experience so that you can focus on your Python code, while Lithops focuses on the deployment of your code at massive scale while monitoring executions, obtaining results, and much more. Lithops enables native Python integration with Code Engine by using the Lithops API. For more information about Lithops, see Lithops quick start guide{: external}. {: shortdesc}

Running your first flow by using the Lithops framework

{: #first-lithops}

Before you can run jobs that reference the Lithops framework, you must first install Lithops and set up a storage backend.

Before you begin

• Install {{site.data.keyword.codeengineshort}} CLI.
• Create and work with a {{site.data.keyword.codeengineshort}} project.
• Find and set your kubeconfig environment variable.

Installing Lithops

{: #install-lithops}

1. Install Lithops{: external}.

2. Create the Lithops configuration file{: external}.

3. Install Docker (community edition) version{: external}.

4. Log in to Docker.

   docker login

   {: pre}

Setting up a storage backend for Lithops

{: #storage-lithops}

Select a supported storage backend; for example, {{site.data.keyword.cos_full_notm}}.

To set up {{site.data.keyword.cos_full_notm}},

1. Create an {{site.data.keyword.cos_full_notm}} account.
2. Create a bucket in the region that you want to use.
3. In the side navigation, click Endpoints to find your API endpoint. You must copy both the public and private endpoints of the region where you created your bucket.
4. Create the credentials to access to your {{site.data.keyword.cos_full_notm}} account. Choose one option

Option 1 (API key) for Lithops

{: #option1-storage}

1. From the {{site.data.keyword.cos_full_notm}} navigation, click Service Credentials.

2. Click New credential + and provide a name and select a role.

3. Click Add to generate service credential.

4. Click View credentials and copy the apikey value.

5. Edit your lithops config file and add the following keys.

   lithops:
       storage_backend: ibm_cos
   
   ibm_cos:
       endpoint   : <REGION_ENDPOINT>  
       private_endpoint : <PRIVATE_REGION_ENDPOINT>
       api_key    : <API_KEY>

   {: pre}

Option 2 ({{site.data.keyword.cos_full_notm}} HMAC credentials) for Lithops

{: #option2-storage}

1. From the {{site.data.keyword.cos_full_notm}} navigation, click Service Credentials.

2. Click New credential + and provide a name and select a role.

3. Click Advanced options and enable the option Include HMAC Credential.

4. Click Add to generate service credential.

5. Click View credentials and copy the access_key_id and secret_access_key values.

6. Edit your lithops config file and add the following keys:

   lithops:
       storage_backend: ibm_cos
   
   ibm_cos:
       endpoint   : <REGION_ENDPOINT>  
       private_endpoint : <PRIVATE_REGION_ENDPOINT>
       access_key    : <ACCESS_KEY_ID>
       secret_key    : <SECRET_KEY_ID>

   {: pre}

Option 3 (IBM IAM API key) for Lithops

{: #option3-storage}

1. If you don't have an IAM API key, navigate to the IBM IAM dashboard.

2. Click Create an IBM Cloud API Key. Enter a name and optional description for your API key and click Create.

3. Copy the generated IAM API key (You can see the key only when you create it, so make sure to copy it).

4. Edit your lithops config file and add the following keys:

   lithops:
       storage_backend: ibm_cos
   
   ibm:
       iam_api_key: <IAM_API_KEY>
   
   ibm_cos:
       endpoint   : <REGION_ENDPOINT>  
       private_endpoint : <PRIVATE_REGION_ENDPOINT>

   {: pre}

Deploy your first {{site.data.keyword.codeengineshort}} job by using Lithops

{: #running-first}

Run the following hello world example,

import lithops

iterdata = [1,2,3,4,5]

def my_map_function(data):
    return data + 1

if __name__ == '__main__':
    pw = lithops.function_executor(type = "serverless", backend='code_engine') 
    futures = pw.map(my_map_function, iterdata)
    print (pw.get_result())
    pw.clean()

{: pre}

Next steps for Lithops

{: #nextsteps-lithops}

You can find more examples and use cases, as well as ask questions, on the Lithops project page{: external}.