I have a node.js application running inside a docker container with base image node:16-alpine3.11. I want to get the name of the container on which it is running on.
ex:
docker ps:
CONTAINER ID NAMES
xyz node
test.js:
const c_name= //get container name
From outside the container
You can use the docker cli to do this. In the example we filter for ancestor bitnami/redis (in your case this would be node:16-alpine3.11)
$ docker container ls --filter "ancestor=bitnami/redis" --format "table {{.ID}}\t{{.Image}}\t{{.Names}}"
This returns the id, name and image of the container as a table. To retrieve the results as a json object, update the format flag like below:
docker container ls --filter "ancestor=bitnami/redis" --format 'json { "Id":"{{.ID}}", "Image": "{{.Image}}", "Names": "{{.Names}}" }'
See the handy cli reference docs provided by docker.
From Inside the Container
Pass the unix socket to the container and invoke a script to get the container name:
$ docker run -it -v "/var/run/docker.sock:/var/run/docker.sock" origami-duckling:latest
The Dockerfile for `origami-duckling looks like this:
FROM node:16-alpine3.11
WORKDIR /usr/app
RUN apk add curl jq
ENV DOCKER_HOST="unix:///run/docker.sock"
COPY get-container-name.sh /usr/app/get-container-name.sh
CMD /usr/app/get-name.sh
You would probably run the get-container-name before you use
cmdto run the node app in your container.
The get-container-name.sh would look like this:
#!/usr/bin/env sh
export CONTAINER_NAME="$(curl -s --unix-socket /run/docker.sock http://docker/containers/$HOSTNAME/json | jq '.Name')"
echo $CONTAINER_NAME
Update: You can do this from within your node.js app if you need to:
I'm using got@11.8.3, got 12.x is pure ESM.
const got = require('got');
async function getHostName() {
const metadata = await got(`http://unix:/var/run/docker.sock:/containers/${process.env.HOSTNAME}/json`).json();
console.log('Container name', metadata.Name);
return metadata.Name
}