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Additional syslog-format option to allow microsecond resolution in syslog timestamp.

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This fix tries to add an additional syslog-format of `rfc5424micro` which follows
the same as rfc5424 except that it use microsecond resolution for timestamp. The
purpose is to solve the issue raised in #21793 where log events might lose its
ordering if happens on the same second.

The timestamp field in rfc5424 is derived from rfc3339, though the maximium
resolution is limited to "TIME-SECFRAC" which is 6 (microsecond resolution).

The appropriate documentation (`docs/admin/logging/overview.md`) has been updated
to reflect the change in this fix.

This fix adds a unit test to cover the newly introduced format.

This fix fixes #21793.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 7581cf96fbe0cddacf246f2982634190ebe455c9
Component: engine
This commit is contained in:
Yong Tang
2016-04-08 05:00:11 +00:00
parent f61a32826f
commit 6e179f4b7d
3 changed files with 23 additions and 3 deletions
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components/engine/docs/admin/logging/overview.md
+3 -2
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@@ -80,7 +80,7 @@ The following logging options are supported for the `syslog` logging driver:
--log-opt syslog-tls-key=/etc/ca-certificates/custom/key.pem
--log-opt syslog-tls-skip-verify=true
--log-opt tag="mailer"
--log-opt syslog-format=[rfc5424|rfc3164]
--log-opt syslog-format=[rfc5424|rfc5424micro|rfc3164]
`syslog-address` specifies the remote syslog server address where the driver connects to.
If not specified it defaults to the local unix socket of the running system.
@@ -135,7 +135,8 @@ the log tag format.
`syslog-format` specifies syslog message format to use when logging.
If not specified it defaults to the local unix syslog format without hostname specification.
Specify rfc3164 to perform logging in RFC-3164 compatible format. Specify rfc5424 to perform
logging in RFC-5424 compatible format
logging in RFC-5424 compatible format. Specify rfc5424micro to perform logging in RFC-5424
compatible format with microsecond timestamp resolution.
## journald options