6 values = "debug","info","notice","warning","error","crit","emerg"
10 Log only messages with severity greater or equal the given
13 debug: Produces really noisy output.
14 info: Still noisy, but won't fill up the disk quickly.
15 notice: Indicates normal, but significant event.
16 warning: Unexpected events that can be handled.
17 error: Unhandled error condition.
18 crit: System might be unreliable.
19 emerg: Last message before exit.