linux_wiki:lambda_python_function

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linux_wiki:lambda_python_function [2019/07/31 20:16]
billdozor [File Conversion Example: Pre-Reqs] 		linux_wiki:lambda_python_function [2019/08/09 22:20]
billdozor [File Conversion Example: Pre-Reqs]
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 See below for Lambda examples. See below for Lambda examples.
   * File Conversion Example - convert images from one format to another when created in a S3 bucket.   * File Conversion Example - convert images from one format to another when created in a S3 bucket.
 +  * Stop/Start EC2 Instances Example - stop/start ec2 instances with a certain tag key:value on a schedule.
  
  
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 Create an IAM role Create an IAM role
   * Services > Security > IAM > Roles > Create Role   * Services > Security > IAM > Roles > Create Role
-    * Choose a service that will use the role: Lambda, Next:Permissions+    * Choose a service that will use the role: Lambda 
 +    * Click 'Next:Permissions'
     * **Required**: Attach the AWS managed policy "AWSLambdaBasicExecutionRole" to your new role in order to log your Lambda function to cloudwatch logs.     * **Required**: Attach the AWS managed policy "AWSLambdaBasicExecutionRole" to your new role in order to log your Lambda function to cloudwatch logs.
     * Also, Create a new policy to allow object put/gets in your bucket. Example:<code json>{     * Also, Create a new policy to allow object put/gets in your bucket. Example:<code json>{
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             "Action": [             "Action": [
                 "s3:PutObject",                 "s3:PutObject",
-                "s3:GetObject"+                "s3:GetObject", 
 +                "s3:ListBucket"
             ],             ],
             "Resource": "arn:aws:s3:::my-test-bucket/*"             "Resource": "arn:aws:s3:::my-test-bucket/*"
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         {         {
             "Sid": "VisualEditor1",             "Sid": "VisualEditor1",
 +            "Effect": "Allow",
 +            "Action": "s3:HeadBucket",
 +            "Resource": "*"
 +        }
 +    ]
 +}</code>
 +
 +----
 +
 +===== Stop/Start EC2 Example: Pre-Reqs =====
 +
 +Create an IAM role
 +  * Services > Security > IAM > Roles > Create Role
 +    * Choose a service that will use the role: Lambda
 +    * Click 'Next:Permissions'
 +    * **Required**: Attach the AWS managed policy "AWSLambdaBasicExecutionRole" to your new role in order to log your Lambda function to cloudwatch logs.
 +    * Also, Create a new policy to allow basic EC2 list,stop,start. Example:<code json>{
 +    "Version": "2012-10-17",
 +    "Statement": [
 +        {
 +            "Sid": "VisualEditor0",
             "Effect": "Allow",             "Effect": "Allow",
             "Action": [             "Action": [
-                "s3:ListAllMyBuckets", +                "ec2:DescribeInstances", 
-                "s3:ListBucket", +                "ec2:StartInstances", 
-                "s3:HeadBucket"+                "ec2:StopInstances"
             ],             ],
             "Resource": "*"             "Resource": "*"
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 ---- ----
 +
  
 ====== Lambda: Create Function ====== ====== Lambda: Create Function ======
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 ====== Lambda: Package and Upload Function ====== ====== Lambda: Package and Upload Function ======
  
-FIXME - TODO+Packaging and uploading a lambda function. 
 + 
 +===== File Conversion Example: Packaging ===== 
 + 
 +  * Create a directory named after the lambda function<code bash>mkdir convertImage</code> 
 + 
 +  * Install required packages into that directory<code bash>pip3 install --target convertImage/ Pillow</code> 
 + 
 +  * Create the lambda function file<code bash>vim convertImage/lambda_function.py 
 + 
 +import json 
 + 
 +def lambda_handler(event, context): 
 +    # TODO implement 
 +    return { 
 +        'statusCode': 200, 
 +        'body': json.dumps('Hello from Lambda!') 
 +    }</code> 
 +    * **Notes** 
 +      * The above is the default code that is created for you in a from scratch lambda function in the console. 
 +      * For the File conversion example and others, see: https://gitlab.com/whowe/aws/tree/master/lambda/ 
 + 
 +  * Package up the directory into a zip<code bash>cd convertImage 
 +zip -r convertImage.zip .</code> 
 +    * **Important**: The archive that is created should NOT contain a parent directory, as this parent directory already exists in AWS Lambda for your function. The "lambda_function.py" needs to be at the root of your structure. 
 + 
 +  * Upload to AWS Lambda 
 +    * CLI Method<code bash>aws lambda update-function-code --function-name convertImage --zip-file fileb://convertImage.zip</code> 
 +    * Web Console Method 
 +      * Login to your AWS console 
 +      * Services > Compute > Lambda 
 +      * Click "Functions > <your function name>" 
 +      * Under "Function code" > "Code entry type" 
 +        * Click the dropdown and select "Upload a .zip file" 
 +        * Under "Function package", click "Upload" 
 +        * Browse to your file and select it 
 +      * In the top right, click "Save"
  
 ---- ----
  
  • linux_wiki/lambda_python_function.txt
  • Last modified: 2019/08/09 22:29
  • by billdozor