Suma Shivaprasad created YARN-7987:
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Summary: Docker container name(--name) needs to be DNS friendly
for DNS resolution to work in user defined networks.
Key: YARN-7987
URL: https://issues.apache.org/jira/browse/YARN-7987
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Suma Shivaprasad
Assignee: Suma Shivaprasad
User defined networks like overlays support DNS resolution through Docker
Embedded DNS which needs the container name (–name parameter value in docker
run) to be a FQDN for container names to be resolved - Please refer
documentation
[https://docs.docker.com/v17.09/engine/userguide/networking/configure-dns/]
However Yarn sets the container name to the container's id which is not DNS
friendly(eg: container_e26_1519402686002_0035_01_000003) and is not a FQDN.
The proposal is to set a FQDN(eg:
ctr-e26-1519402686002-0035-01-000003.domain-name) as the docker container's
name for containers to be able to communicate to each other via hostnames in
user defined networks like overlays, bridges etc. The domain name will be
picked up from the YARN DNS registry configuration
(hadoop.registry.dns.domain-name)
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