Logspout-S3

Logspout-S3 is a container app that listens on the Docker bus and streams application logs to Amazon S3 at some FLUSH_INTERVAL or MAX_SINK_SIZE_MB. It's built as an adapter to github.com/gliderlabs/logspout.

Usage

docker run -d --name=logspout-s3 \
	-e 'BACKLOG=false' \
	-e 'AWS_ACCESS_KEY=YOUR_KEY' \
	-e 'AWS_SECRET_KEY=YOUR_SECRET_KEY' \
	-e 'AWS_REGION=us-east-1' \
	-e 'FLUSH_INTERVAL=120' \
	-e 'MAX_SINK_SIZE_MB=16' \
	--volume=/var/run/docker.sock:/var/run/docker.sock \
	pressly/logspout-s3 \
	s3://pressly-logs-test?path=/logs

See the example/ folder and Makefile to get started. It demonstrates a REST API service with JSON structured logging output, and also the start command for logspout-s3 which will stream those logs.

The s3 url can be just the bucket as in s3://bucketname or you can provide the additional path query param which is the directory to store container logs as in the example usage above.

If you'd like to query the logs, check out https://aws.amazon.com/athena/ which uses S3 as a backend for any kind of log data to query/visualize.

Image run options

The container app supports a few environment variables as options:

• AWS_ACCESS_KEY : your AWS access key
• AWS_SECRET_KEY : your AWS secret key
• AWS_REGION : the AWS region where your S3 bucket resides
• FLUSH_INTERVAL : interval that collected logs are then uploaded to S3, as seconds (default: 120)
• MAX_SINK_SIZE_MB : max buffer size for log collection before sending to S3, as MB (default: 16)

as well, the container command where in above example its s3://pressly-logs-test can also accept additional paths as the folder prefix, ie. s3://pressly-logs-test/logs

Tips

Setup an IAM user with the S3 policy to only write access to your logging buckets, like:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "s3:PutObject"
            ],
            "Effect": "Allow",
            "Resource": [
                "arn:aws:s3:::pressly-logs-test",
                "arn:aws:s3:::pressly-logs-test/*"
            ]
        }
    ]
}

LICENSE

MIT