I need to cache some data in Redis and get access to it from AWS Lambda. How can I get secure access from AWS Lambda to Redis (AWS Elastic cache)?
Is VPC required? Because I know that VPC increase 1) AWS Lambdas cold starts 2) increase bills (network usage).
Yes, you will need a VPC to connect to Redis.
AWS allows using lambda functions to connect to Elasticache. Here is a link how it works - Tutorial: Configuring a Lambda Function to Access Amazon ElastiCache in an Amazon VPC
Also, I agree with VPC increasing cold starts, you can probably work around that by doing warmups and sharing context across Lambda invocations. More details can be found here .
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