docker-library / docker-library/postgres
Docker default network subnet compatibility
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Description
On Docker Desktop on macOS, the default docker subnet is set to 192.168.65.0/24, but the pg_hba.conf is configured to allow 172.17.0.0/16 as follows:
host all all 172.17.0.0/16 md5
This is raising the exception "no pg_hba.conf entry for host 192.168.65.1" when trying to connect login to Postgres. Shouldn't it change to be compatible with the default docker subnet mask?
Docker Desktop version: 4.38.0 (the issue is not there on 4.37.2 and earlier)
Postgres: 15
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by checking how pg_hba.conf is configured for the Postgres 15 image and compare the allowed 172.17.0.0/16 range with Docker Desktop 4.38.0's reported 192.168.65.0/24 subnet. Reproduce the login failure on macOS, then verify that the resulting configuration permits the reported host without breaking earlier Docker setups.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker, postgres, shell
- Domain
- databases, devops
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100