DynamoDB for PHP sessions
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The document outlines the steps to use DynamoDB for PHP session storage, highlighting its availability and consistency. It provides a detailed process that includes user creation, table setup, SDK installation, and configuration for session handling. Additionally, it offers considerations for managing throughput and locking configurations.
![Give Permissions
{ "Statement": [
{ "Sid": "Stmt1335183103764",
"Action": [
"dynamodb:BatchGetItem",
"dynamodb:DeleteItem",
"dynamodb:DescribeTable",
"dynamodb:GetItem",
"dynamodb:PutItem",
"dynamodb:Query",
"dynamodb:Scan",
"dynamodb:UpdateItem" ],
"Effect": "Allow",
"Resource": [ "arn:aws:dynamodb:us-east-
1:846544612030:table/php-sessions-test"]
} ] }
5](https://image.slidesharecdn.com/03-awsuggreece-dynamodbforphpsessions-120426023514-phpapp01/85/DynamoDB-for-PHP-sessions-5-320.jpg)
DynamoDB for PHP sessions
- 1. DynamoDB for PHP Session Storage 25 April 2012 Andreas Chatzakis @achatzakis on twitter AWSUG Greece Not affiliated with, sponsored or endorsed by AWS
- 2. Sessions in the cloud Sticky sessions? Memcache? MySQL? Redis? Enter DynamoDB: Highly available – Consistently performing Persistent AWS SDK now includes drop in PHP session handler replacement 2
- 3. Create a user 3
- 4. Create a table 4
- 5. Give Permissions { "Statement": [ { "Sid": "Stmt1335183103764", "Action": [ "dynamodb:BatchGetItem", "dynamodb:DeleteItem", "dynamodb:DescribeTable", "dynamodb:GetItem", "dynamodb:PutItem", "dynamodb:Query", "dynamodb:Scan", "dynamodb:UpdateItem" ], "Effect": "Allow", "Resource": [ "arn:aws:dynamodb:us-east- 1:846544612030:table/php-sessions-test"] } ] } 5
- 6. Install & Configure SDK Install the latest version of the SDK on your web server image - http://aws.amazon.com/sdkforphp/ Update config.inc.php with the credentials of the user we created in step 1 the default-cache-config parameter (we went for apc, as it is already running on our instances.) any other parameters depending on your specific setup details (the file is well documented) 6
- 7. Instantiate require_once '/path-to/AWSSDKforPHP/sdk.class.php'; // Instantiate the Amazon DynamoDB client. $dynamodb = new AmazonDynamoDB(); $dynamodb->set_hostname("https://dynamodb.us-east-1.amazonaws.com"); // Register the DynamoDB Session Handler. $handler = $dynamodb->register_session_handler(array( 'table_name' => 'php-sessions-test', 'hash_key' => 'id', 'session_lifetime' => 0, 'consistent_reads' => true, 'session_locking' => false, 'max_lock_wait_time' => 15, 'min_lock_retry_utime' => 5000, 'max_lock_retry_utime' => 50000, )); 7
- 8. Update php.ini session.save_handler = user auto_prepend_file = /path-to/dynamosessions.php Restart web server Test Snapshot fresh AMI 8
- 9. Considerations Estimate read/write throughput requirements Validate post go live Does your application need locking? By default php implements pessimistic locking. The class provided by AWS supports it Configure it to FALSE if you dont need it (this will decrease costs and increase performance). Thorough testing would be required to validate your selection. 9