This is a sample template for lambda-promtail - Below is a brief explanation of what we have generated for you:
.
├── Makefile <-- Make to automate build
├── README.md <-- This instructions file
├── hello-world <-- Source code for a lambda function
│ └── main.go <-- Lambda function code
└── template.yaml
- AWS CLI already configured with Administrator permission
- Docker installed
- Golang
- SAM CLI - Install the SAM CLI
In this example we use the built-in sam build
to automatically download all the dependencies and package our build target.
Read more about SAM Build here
The sam build
command is wrapped inside of the Makefile
. To execute this simply run
make
**Invoking function locally
make dry-run
AWS Lambda Golang runtime requires a flat folder with the executable generated on build step. SAM will use CodeUri
property to know where to look up for the application:
make build
To deploy your application for the first time, first make sure you've set the following parameters in the template:
LogGroup
PromtailAddress
ReservedConcurrency
These can also be set via overrides by passing the following argument to sam deploy
:
--parameter-overrides Optional. A string that contains AWS
CloudFormation parameter overrides encoded
as key=value pairs.For example, 'ParameterKe
y=KeyPairName,ParameterValue=MyKey Parameter
Key=InstanceType,ParameterValue=t1.micro' or
KeyPairName=MyKey InstanceType=t1.micro
Also, if your deployment requires a VPC configuration, make sure to edit the VpcConfig
field in the template.yaml
manually.
Then run the following in your shell:
sam deploy --guided --capabilities CAPABILITY_IAM,CAPABILITY_NAMED_IAM --parameter-overrides PromtailAddress=<>,LogGroup=<>
The command will package and deploy your application to AWS, with a series of prompts:
- Stack Name: The name of the stack to deploy to CloudFormation. This should be unique to your account and region, and a good starting point would be something matching your project name.
- AWS Region: The AWS region you want to deploy your app to.
- Confirm changes before deploy: If set to yes, any change sets will be shown to you before execution for manual review. If set to no, the AWS SAM CLI will automatically deploy application changes.
- Allow SAM CLI IAM role creation: Many AWS SAM templates, including this example, create AWS IAM roles required for the AWS Lambda function(s) included to access AWS services. By default, these are scoped down to minimum required permissions. To deploy an AWS CloudFormation stack which creates or modified IAM roles, the
CAPABILITY_IAM
value forcapabilities
must be provided. If permission isn't provided through this prompt, to deploy this example you must explicitly pass--capabilities CAPABILITY_IAM
to thesam deploy
command. - Save arguments to samconfig.toml: If set to yes, your choices will be saved to a configuration file inside the project, so that in the future you can just re-run
sam deploy
without parameters to deploy changes to your application.
Please ensure Go 1.x (where 'x' is the latest version) is installed as per the instructions on the official golang website: https://golang.org/doc/install
A quickstart way would be to use Homebrew, chocolatey or your linux package manager.
Issue the following command from the terminal:
brew install golang
If it's already installed, run the following command to ensure it's the latest version:
brew update
brew upgrade golang
Issue the following command from the powershell:
choco install golang
If it's already installed, run the following command to ensure it's the latest version:
choco upgrade golang
- Error handling: If promtail is unresponsive,
lambda-promtail
will drop logs afterretry_count
, which defaults to 2. - AWS does not support passing log lines over 256kb to lambdas.