Log-shuttle is an open source UNIX program that delivers messages from applications and daemons to log routers and processors via HTTPs.

One of the motivations behind log-shuttle is to provide a simpler form of encrypted & authenticated log delivery. Using HTTPs & Basic Authentication is simpler than the techniques described in RFC5425. TLS transport mapping for Syslog requires that you maintain both client & server certificates for authentication. In multi-tenant environments, the maintenance of certificate management can be quite burdensome.

When using log-shuttle with logplex it is recommended that you spawn 1 log-shuttle per logplex token. This will isolate data between customers and ensure a good QoS. Log-shuttle accepts input from stdin in a newline (\n) delimited format.

When using log-shuttle with Amazon's Kinesis, all the details for the region, stream and access credentials are supplied in the -logs-url (or $LOGS_URL env variable). See the Kinesis setion of this document.

To block as little as possible, log-shuttle will drop outstanding batches if it accumulates > -back-buff amount.

log-shuttle sends data into Kinesis using the PutRecords API call. Each Kinesis record is encoded as length prefixed rfc5424 encoded logs as per rfc6587 (this is the same format logplex accepts). One record per log line.

Log-shuttle expects the following encoding of -logs-url when using Amazon Kinesis:

```
https://<AWS_KEY>:<AWS_SECRET>@kinesis.<AMAZON_REGION>.amazonaws.com/<STREAM NAME>
```

See the Amazon Endpoints documentation for supported regions and hostnames.

Things that should be handled better/things you should know:

1. AWS_SECRET, AWS_KEY, AMAZON_REGION & STREAM NAME need to be properly url encoded.
2. log-shuttle assumes a 200 response means everything is good. Kinesis can return a 200, meaning the http request was good, but include per record errors in the response body.
3. The maximum number of records in a PutRecords requests is 500, so set the batch size no higher than 498 (500 - 2 records for possible drops / lost).
4. Logplex max line length is 10k, Kinesis max record size is 50k of base64 encoded data. A -max-line-length of somewhere less than 37500 should work for Kinesis w/o causing errors.
5. Kinesis does not support the -gzip option as that option compresses the body of the request.
6. Even with -kinesis-shards, no guarantees can be made about writing to unique shards.

$ go get -u github.com/heroku/log-shuttle/...

After that $GOPATH/bin/log-shuttle should be available.

Requires:

• dpkg (see also brew install dpkg)
• go & gox (updated via Makefile)

make debs

There is a Makefile target named docker that can be used to build a docker image.

Fork the repo, hack, submit PRs.

$ go test -v ./...

• Open an issue on GitHub.
• Keep changes in a feature branch
• Submit PR

Libc uses a local AF_UNIX SOCK_DGRAM (or SOCK_STREAM) for syslog(3) calls. Most unix utils use the syslog(3) call to log to syslog. You can have log-shuttle transport those messages too with a little help from some other standard unix programs.

1. Stop your local syslog
2. rm -f /dev/log
3. us netcat, tr, stdbuf to read connections to /dev/log and convert the \0 terminator to \n

Like so...

sudo /etc/init.d/rsyslog stop
sudo rm -f /dev/log
(sudo nc -n -k -d -Ul /dev/log & until [ ! -e /dev/log ]; do sleep 0.01; done; sudo chmod a+rw /dev/log) | stdbuf -i0 -o0 tr \\0 \\n | ./log-shuttle -logs-url=... ... -input-format=rfc3164

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