CODEWITHSUNDEEP
amazon-web-servicesdockeramazon-elastic-beanstalk
Josh Glover
Josh Glover

Reputation: 26160

Setting Docker container hostname on Elastic Beanstalk

I would like to set the hostname for a Docker container deployed on AWS Elastic Beanstalk manually. You can set the hostname when spinning up a container with docker run -h HOSTNAME, but I can't figure out how (or even if) to pass custom arguments to the docker run command.

The Dockerrun.aws.json file seems a likely candidate, but there are no documented keys that do what I want.

Does anyone know if this is possible?

Upvotes: 9

Views: 2346

Answers (4)

vivekyad4v
vivekyad4v

Reputation: 14903

Not sure about single docker container deployment i.e v1 since i haven't tried that yet but they are definitely supported in v2 i.e multi container deployment. You can adda container hostname by putting below in Dockerrun.aws.json - 

  "hostname": "this-is-my-container-hostname"

Upvotes: 1

miry
miry

Reputation: 328

If you have multiple instance we patched old platforms with next script, but you can port it to new platforms. Example of .ebextensions/01-docker-hostname.config:

files:
  "/opt/elasticbeanstalk/hooks/appdeploy/pre/04a_set_hostname.sh":
    mode: "000755"
    owner: root
    group: root
    content: |
      #!/usr/bin/env bash
      hostname $(hostname -f | cut -d"." -f1,2)
      sed -i "s/docker run -d \\\/docker run -d -h $(hostname) \\\/" /opt/elasticbeanstalk/hooks/appdeploy/enact/04run.sh

As you see our script always patches the run script. EB run scripts in filename order. So you should be sure that your script runs before run script.

Upvotes: 0

c0nstantx
c0nstantx

Reputation: 39

You can set the hostname of the container by defining it as environment variable.

HOSTNAME=your-name

Upvotes: -1

Tal
Tal

Reputation: 7997

As far as I know this is not supported out of the box.

A possible hack here is to exploit EB's poor parsing of environment variables. You can setup an environment variable such as:
PARAM1=dummy -h MYHOSTNAME
EB doesn't quote the parameters, so your -h part will be embedded into the docker run command. I didn't try it myself.

Another option would be to create an ebextension file to patch the /opt/elasticbeanstalk/hooks/appdeploy/pre/04run.sh script, injecting the -h MYHOST line into it.

Upvotes: 3

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