Docker Container Number

If you use docker --scale and need to know container number.

Usage

Docker

Run

docker run --name dcn --rm -p 127.0.0.1:8080:80 -v /var/run/docker.sock:/var/run/docker.sock -t gupalo/docker-container-number:latest

Call from container

THREAD_NO=`curl -s http://127.0.0.1:8080/$(hostname)`

Docker Compose

Add to docker-compose.yaml

dcn:
    image: 'gupalo/docker-container-number'
    volumes: ['/var/run/docker.sock:/var/run/docker.sock']
    restart: 'always'
    #networks: ['common']

You can add this container to each docker-compose.yaml or create global docker-compose.yaml with shared network.

Call from container

export THREAD_NO=`curl -s "http://dcn/$(hostname)"`

Dev

Build

make build

Run

make run