Description

Buffer logs to S3, batching them up by size and/or time period. This is intended to be a replacement for rotatelogs on (e.g.) Apache HTTPD servers running in the cloud.

Usage

stream-logs-to-s3 [options] s3://bucket/path-template

Options

-d, --duration #<unit>
Maximum duration to buffer before flushing to S3; defaults to 1h. The duration is any string acceptable to the humantime crate, e.g., "1hour 12min 5s".
-t, --tempdir directory
Temporary directory to use for buffering; defaults to $TMPDIR (if set), /tmp otherwise.
-s, --size #<unit>>
Maximum size to buffer before flushing to S3; defaults to 1MiB. The size is any string acceptable to the byte_unit crate, e.g., "123KiB".
-i, --input <filename>
Read input from the specified file (should be a FIFO) instead of stdin; this is usually for testing.
-z, --gzip
Compress output using gzip.
-h, --help
Show this usage information

Environment variables

stream-logs-to-s3 uses the standard AWS SDK / Rusoto methods of specifying AWS credentials.

AWS_DEFAULT_REGION / AWS_REGION
Specify the region to make calls to S3 in. Defaults to us-east-1.
AWS_PROFILE
If specified, read AWS credentials from this section in the ~/.aws/credentials file.
AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY / AWS_SESSION_TOKEN
If specified, the AWS credentials to use.

If credentials are not specified, they are read from the EC2 or ECS metadata endpoint.

Path template

The path template can include the following variables. Timestamps are generated in the UTC timezone.

{host_id} — The EC2 instance id, ECS task id, hostname, or IP address.
{year} — The current year.
{month} — The current month as a 2-digit string.
{day} — The current day as a 2-digit string.
{hour} — The current hour as a 2-digit string.
{minute} — The current minute as a 2-digit string.
{second} — The current second as a 2-digit string.
{unique} — A unique identifier to ensure filename uniqueness.

To include a raw { or } in the output, double it: {{ / }}.

License

This program is dual licensed under the MIT and Apache-2.0 licenses.