failed to create file via template error in newer release. what changed??

[fatmann66]

I have an existing docker compose that is working without issue for some time. Migrated to a new host /docker environment and and spun up my existing compose file. I get the below error in the log fine when trying to start the backup container.

mktemp: failed to create file via template ‘/tmp/tmp.XXXXXXXXXX’: Permission denied

check back on my old environment to see what image I was running and it looks to be 2025.4.0.

if I set 2025.4.0 as my image everything comes up as it should.

I checked the samples https://github.com/itzg/docker-mc-backup/blob/master/examples/docker-compose.yml
and this is basically what I'm running.

so I'm not really sure what changed. (obviously a lot since 2025.4) but the sample docker compose seems to be the same as what I have for the 2025.4 image.

any help would be great,
Thanks,

[itzg]

I need to look at why /tmp is even being used by the script. I usually avoid that since it can be inconsistent between container engines.