Elastic does not provide Filebeat binaries for ARMv7. Luckily, Filebeat can easily be cross-compiled with:

```bash
# ----- Instantiate an immutable Go container for cross-compilation ----- #
mkdir build && cd $_
docker run -it --rm -v `pwd`:/build golang:1.9 /bin/bash

# ----- Inside Go container ----- #
go get github.com/elastic/beats
cd /go/src/github.com/elastic/beats/filebeat/
git checkout v6.2.2
GOARCH=arm go build
cp filebeat /build
exit

# ----- Verify the output file ----- #
file filebeat
#filebeat: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, not stripped
```

The newly built Filebeat binary can then be uploaded to the remote PCM3, for example with http://transfer.sh

On the PCM3:
- Download the official 32-bit Linux archive from https://www.elastic.co/downloads/beats/filebeat. Extract the archive and replace the Filebeat binary with the one you cross-compiled and uploaded.
- Install Filebeat by following the Mac instructions at https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-installation.html
- Configure Filebeat as described in the **Using Filebeat** section at https://logz.io/blog/docker-logging/
- Run Filebeat and confirm your logs show up in Kibana at `elk_stack_ip:5601` with a `filebeat-*` index pattern.