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journald log driver: use CONTAINER_ID field for container id 

This patch modifies the journald log driver to store the container ID in
a field named CONTAINER_ID, rather than (ab)using the MESSAGE_ID field.
Additionally, this adds the CONTAINER_ID_FULL field containing the
complete container ID and CONTAINER_NAME, containing the container name.

When using the journald log driver, this permits you to see log messages
from a particular container like this:

    # journalctl CONTAINER_ID=a9238443e193

Example output from "journalctl -o verbose" includes the following:

    CONTAINER_ID=27aae7361e67
    CONTAINER_ID_FULL=27aae7361e67e2b4d3864280acd2b80e78daf8ec73786d8b68f3afeeaabbd4c4
    CONTAINER_NAME=web

Closes: #12864
Signed-off-by: Lars Kellogg-Stedman <lars@redhat.com>
This commit is contained in:
Lars Kellogg-Stedman 2015-04-28 21:23:27 -04:00 committed by Tibor Vass
parent 16d979a292
commit c6bcaacce7
1 changed files with 1 additions and 1 deletions
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docs/sources/reference/run.md
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@ -812,7 +812,7 @@ command is not available for this logging driver
#### Logging driver: journald
Journald logging driver for Docker. Writes log messages to journald. `docker logs` command is not available for this logging driver
Journald logging driver for Docker. Writes log messages to journald; the container id will be stored in the journal's `CONTAINER_ID` field. `docker logs` command is not available for this logging driver. For detailed information on working with this logging driver, see [the journald logging driver](reference/logging/journald) reference documentation.
## Overriding Dockerfile image defaults