secret-base36

Containerized util to generate secret (random) string using NodeJS.

Perhaps interesting as a minimal Node Docker demo.

Try my pre-built image on DockerHub:

docker run evanxsummers/secret-base36

This image is built by:

docker build -t secret-base36 https://github.com/evanx/secret-base36.git

from the Dockerfile:

FROM mhart/alpine-node
CMD ["node", "-p", "(Date.now()*Math.random()).toString(36).replace(/\\./, '')"]

where we double-escape the backslash as \\

Incidently can inspect the image:

docker inspect evanxsummers/secret-base36 | grep CMD

to see:

"CMD [\"node\" \"-p\" \"(Date.now()*Math.random()).toString(36).replace(/\\\\./, '')\"]"

Let's fetch the Dockerfile and build ourselves:

curl -s https://raw.githubusercontent.com/evanx/secret-base36/master/Dockerfile |
  docker build -t secret-base36 -
docker inspect secret-base36 | grep 'CMD'  
docker run secret-base36

or alternatively Dockerfile.node740 for the official Node 7.4.0 image, similarly to the following demo:

echo "(Date.now()*Math.random()).toString(36).replace(/\./, '')" |
  docker run -i `
    echo '
      FROM node:7.4.0
      CMD ["node", "-p"]
    ' | docker build -q -
  `

where:

• our command is node -p to print the result of the JavaScript piped in.
• to enable standard input, we use docker run -i
• we pipe Dockerfile contents to docker build -
• docker build -q prints the built container ID only

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