Invalidate Docker build cache deliberately after a build-secret change
Rotating a build credential does not necessarily rerun the instruction that consumes it.
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Pass Docker build credentials through dedicated secret mounts
Build arguments and environment variables can leave credentials in the resulting image.
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Trace Compose environment values to the winning definition
Editing one file may have no effect when a higher-precedence input supplies the value.
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Require Compose dependency health when startup order is insufficient
A running database container may still be unable to serve the application starting after it.
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Plan Docker macvlan management access separately from LAN reachability
A container can appear directly on the physical network while remaining unable to reach its own host.
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Verify platform support before enabling encrypted Docker overlays
An encryption flag is not evidence that every attached operating system receives encrypted service.
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Test published Docker ports beyond the host ufw rule list
An apparently restrictive ufw policy may not describe the path taken by container traffic.
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Account for manual Docker stops when reviewing restart policy
A configured restart policy can intentionally stand aside after an operator stops the container.
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Separate Docker launch errors from the application’s exit status
A failed docker run command does not always mean the application started and crashed.
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Interpret Docker memory-swap together with the memory limit
The swap setting is not simply a second independent RAM allowance.
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