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I need to start multiple containers for the same image. If i create my compose file as shown below, it works fine.
version: '2' services: app01: image: app app02: image: app app03: image: app app04: image: app app05: image: app Is there any easy way for me to mention the number of instances for the compose instead of copy and pasting multiple times?
934
If you're expecting it to behave the same way, as when running a single container, it won't happen. If there's no specific reason for using version: '3' you may use version:'2' instead. Or you can let it create its own network, which it does with your current docker-compose file.
None. A Docker container is built from one image.
🔗 Compose uses the project name to create unique identifiers for all of a project's containers and other resources. To run multiple copies of a project, set a custom project name using the -p command line option or the COMPOSE_PROJECT_NAME environment variable.
Docker doesn't support mounting of different OS. Also, I cannot launch multiple OS containers from a single OS image.” Am I right? No, you can run Ubuntu docker image in RHEL Docker host or another other docker host. “Let say, I have an application image and this image doesn't contain any stuff related to guest OS.
Updated answer (Oct 2017)
As others mentioned, the docker API has changed. I'm updating my answer since it's the one most people will probably look at.
docker-compose up -d --scale app=5
Unfortunately, we cannot specify this in a docker-compose.yml file currently (as of version 3.5).
Details:
They did introduce the scale option for version 2.2 and 2.3 of docker-compose but removed it for version 3.0. Also, to use version 2.2 or 2.3 you would need to download an older version of the docker-compose tool. The current version does not support 2.2 or 2.3 (it does support 2.0 or 2.1 however). There is also a new deploy section with replicas: 5 but it's only for swarm mode.
--- Old Answer --------------------------------------
docker-compose scale app=5
See https://docs.docker.com/compose/reference/scale/
Then you only need this docker-compose file
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