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docs: add documentation for dm.libdm_log_level

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This is a new option added specifically to allow for debugging of bugs
in Docker's storage drivers or libdm itself.

Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai
2017-07-13 00:38:47 +10:00
committed by Cory Snider
parent 7d3f09a9c3
commit 25baee8ab9
1 changed files with 25 additions and 0 deletions
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man/dockerd.8.md
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@@ -703,6 +703,31 @@ Example use:
$ sudo dockerd --storage-opt dm.xfs_nospace_max_retries=0
##### dm.libdm_log_level
Specifies the maxmimum libdm log level that will be forwarded to the dockerd
log (as specified by --log-level). This option is primarily intended for
debugging problems involving libdm. Using values other than the defaults may
cause false-positive warnings to be logged.
Values specified must fall within the range of valid libdm log levels. At the
time of writing, the following is the list of libdm log levels as well as their
corresponding levels when output by dockerd.
| libdm Level | Value | --log-level |
| ----------- | -----:| ----------- |
| _LOG_FATAL | 2 | error |
| _LOG_ERR | 3 | error |
| _LOG_WARN | 4 | warn |
| _LOG_NOTICE | 5 | info |
| _LOG_INFO | 6 | info |
| _LOG_DEBUG | 7 | debug |
Example use:
$ sudo dockerd \
--log-level debug \
--storage-opt dm.libdm_log_level=7
## ZFS options