Give containers unique machine-id based off container ID#6457
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mheon wants to merge 1 commit intomoby:masterfrom
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Give containers unique machine-id based off container ID#6457mheon wants to merge 1 commit intomoby:masterfrom
mheon wants to merge 1 commit intomoby:masterfrom
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The first 32 characters (16 hex-encoded bytes) of a container's UUID are placed in a file in the container's context path, then bind mounted to /etc/machine-id This provides each container with an ID unique from the host system Fixed docker diff test case to include new file, preventing breakage Docker-DCO-1.1-Signed-off-by: Matt Heon <[email protected]> (github: mheon)
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PR #6481 duplicates this, but seems better implemented - closing this in favor of the new PR. |
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Currently, all containers on a host share a single machine ID, accessible in /etc/machine-id. This patch adds a per-container unique ID (formed by truncating the container's ID). Programs which report information based off or identified by machine-id can now distinguish which container they are in.
Major application for this is logging with journald - these logs are distinguished based on machine-id, and with a unique per-container machine-id and a few symlinks, an in-container systemd instance can send logs (uniquely tied to the generating container) to the host.