Traefik backup fails after upgrade to 3.0.0

[DavidePrincipi]

On some installations that were upgraded to Traefik 3.0.0 (Core 3.6.0) the Traefik backup task fails.

Steps to reproduce

• Install NS8 with Core 3.5 and Traefik 2
• Configure backup task for Traefik
• (!) Do not configure any manual HTTP route in Traefik
• Upgrade to latest Core

Expected behavior

The backup task runs successfully.

Actual behavior

The backup task fails with error:

2025-03-18T16:53:05+01:00 [1:traefik1:agent@traefik1] cp: cannot stat ‘manual_flags’: No such file or directory
2025-03-18T16:53:05+01:00 [1:traefik1:agent@traefik1] [ERROR] module-dump-state failed. Command ‘[‘module-dump-state’, ‘2’]’ returned non-zero exit status 1.

Components

• Core 3.6.1
• Traefik 3.0.0

See also

Community forum: https://community.nethserver.org/t/backup-ns8-after-last-update-cannot-stat-manual-flags/25576

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Thanks to @mrmarkuz

[DavidePrincipi]

In testing:

• Traefik 3.0.1-dev.1

Test case

Check the bug is not reproducible after upgrading to Traefik 3.0.1-dev.1. Upgrade from Software Center / Core Apps page.

[nrauso]

test case: VERIFIED