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Docker S3 Sync

A docker container to periodically fetch files from S3.

It's useful for provisioning sensitive credentials.

See ktheory/docker-s3-sync in the docker registry.


Basic docker example:

# Copy s3://mybucket/authorized_keys to /root/.ssh/authorized_keys
docker run \
-e S3_BUCKET=mybucket \
-e S3_KEY=authorized_keys \
-e DESTINATION=/data/authorized_keys \
-e MODE='0600' # Optional file mode
-e OWNER_UID='1000' # Optional file owner
-e OWNER_GID='1000' # Optional file group
-v /root/.ssh:/data # Map /root/.ssh on the host to /data in the container
--rm \

AWS credentials are assumed to be provided via an IAM instance profile.
To use traditional AWS credentials, pass AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY env vars.

Convenient docker-s3-sync script

A small ruby script is included to use the container more concisely.

Install it:

curl -O /usr/local/bin/docker-s3-sync
chmod +x /usr/local/bin/docker-s3-sync

Use it:

docker-s3-sync -b BUCKET -k KEY [-i INTERVAL ] [-m MODE] [-u UID] [-g GID] DESTINATION

# For example:
docker-s3-sync -b mybucket -k authorized_keys -m 0600 /root/.ssh/authorized_keys
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