[IMP] Dockerfile: create known_hosts file

[quirino95]

When a ssh/sftp connection is configured, the first run (both backup or jobrunner) fails because there is no file /root/.ssh/known_hosts, which has to be created manually.
This fix in Dockerfile creates .ssh folder and known_hosts file, in order to make the first run right and avoid this kind of error.

[pedrobaeza]

AFAIK, this is done in the scaffolding. Can you confirm, @josep-tecnativa ?

[aleuffre]

I can confirm that the file is not present

Output of

docker container run --rm ghcr.io/tecnativa/docker-duplicity-postgres:edge sh "ls -al /root/.ssh"

is as follows:

fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/community/x86_64/APKINDEX.tar.gz
(1/1) Installing postgresql16-client (16.9-r0)
Executing postgresql-common-1.2-r1.trigger
* Setting postgresql16 as the default version
*
* You are using 'postgresql16'. It's recommended to upgrade to the latest
* major version provided by package 'postgresql17'.
* Use command 'pg_versions' to switch between versions.
*
OK: 50 MiB in 95 packages
psql (PostgreSQL) 16.9
pg_dump (PostgreSQL) 16.9
sh: can't open 'ls -al /root/.ssh': No such file or directory

That said, I'm not sure if this would work the moment you use a volume to preserve /root as recommended in Doodba https://github.com/Tecnativa/doodba-copier-template/blob/main/common.yaml.jinja#L113

@quirino95 Can you check? Alternatively, the commands you added could go in the entrypoint instead.

[quirino95]

Updated code, moved command in entrypoint.

[josep-tecnativa]

TBH, we’ve never needed that, but if you’ve been running into issues due to a missing .ssh/known_hosts, I’m fine with creating it in the entrypoint. Just make sure the folder has the required permissions.

[quirino95]

Hi @josep-tecnativa , I've made the permissions explicit to be sure, both on .ssh folder and known_hosts file.