Zip contents of current directory for Lambda

To create a AWS Lambda bundle, you need create a zip archive of your app directory that doesn’t contain a parent directory. To do this, cd to your app directory and execute:

zip -r -X "../app.zip" *

Override Docker Entrypoint properly

It’s not always so obvious what format the `ENTRYPOINT` override should take in a `docker run` command, so here is an example to clarify if you wanted to get a file list instead of the default entrypoint: first override the default ENTRYPOINT command with `/bin/ls` as a `run` argument then pass any args after the image name.

docker run --entrypoint "/bin/ls" namespace/imagename -al /container/path/tolist

As mentioned in the Docker docs, ENTRYPOINT only specifies the executable to run when the container starts.

Docker copy files from image to local

You can’t easily copy file directly from a Docker image, but you can from a temporary container. Couple different ways to do it include:

Run a temp container and copy into local mounted directory, here it’s a directory named “tmp” inside your current directory:

docker run --rm -v $(pwd)/tmp:/tmp <image-name:tag> sh -c "cp -r /path/to/files/* /tmp"

You could do additional pre/post processing and gather additional files as needed, etc. by updating the sh (or bash or other) command.

Or you can simply copy a directory from a static temporary container to a tar file:

id=$(docker create <image-name:tag>)
docker cp $id:path - > local.tar
docker rm -v $id

Setting up Uncomplicated FireWall (UFW)

Primarily used on Ubuntu and Debian:

apt-get install ufw
 
ufw enable
 
ufw default deny incoming
ufw default allow outgoing
 
# checkit:
ufw status verbose
 
# add ssh
ufw allow ssh
 
# add other rules by servicename or custom, e.g. for Redis:
# ufw allow in on eth1 to any port 6379 proto tcp

see more here

Docker stats with container names

docker stats `docker ps | awk '{print $NF}' | grep -v NAMES`

Docker remove orphaned volumes

docker volume rm $(docker volume ls -qf dangling=true)

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