This repository holds the Dockerfile for our journald wrapper to Amazon CloudWatch Logs.
This container is designed to be run over a CoreOS system, due to his dependency on Etcd. Etcd is used to hold last logs pushed, stored under /config/journald/{prefix}_{instance_id}/cursor key.
Also, it needs the service systemd-journal-gatewayd.service to be started, that exposes journald logs throught a webpage allowing to use Server-Sent Events.
If you are running this wrapper with an old instance, with lots of existing logs; I strongly recommend you to use the standard gateway web interface to set the last cursor in etcd with a recent log cursor.
- Make the script available as a gem, using a gemfile to install container dependencies.
- Extract some concepts like; abstract the store used for the last cursor, stack events before sending them to AWS, ...
- Make it less dependends of an EC2 instance
- CURSOR_PATH: the path in which the last cursor is written. Should be also defined as a volume to be saved in the container host.
- AWS_ACCESS_KEY_ID: AWS access key id used to push logs
- AWS_SECRET_ACCESS_KEY: AWS access secret
- AWS_REGION: AWS region
- PREFIX: a prefix to help you identify your cluster. The log group name will be:
PREFIX_INSTANCE-ID.
# Ensure to have start `systemd-journal-gatewayd.service` service
sudo systemctl start systemd-journal-gatewayd.service
# build container
docker build -t journald_wrapper .
# run container
docker run -d -v /data/journald:/var/journald -e CURSOR_PATH=/var/journald -e AWS_ACCESS_KEY_ID={YOUR_KEY_ID} -e AWS_SECRET_ACCESS_KEY={YOUR_SECRET} -e AWS_REGION={YOUR_REGION} -e PREFIX={A_PREFIX_IDENTIFIER} journald_wrapper
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