How to split log file in using glog(github.com/golang/glog)

Question

Because my server may run for a long time, the log file will be too large.Is there any way to cut logs according to size or time?

Answer 1

Now I found a way to split logs. Using third party libraries.(ex:https://github.com/natefinch/lumberjack)

Answer 2

Since you worry about a large log file, try conditional logging or occassional logging You can use the following macros to perform conditional logging:

LOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";

The "Got lots of cookies" message is logged only when the variable num_cookies exceeds 10. If a line of code is executed many times, it may be useful to only log a message at certain intervals. This kind of logging is most useful for informational messages.

LOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";

The above line outputs a log messages on the 1st, 11th, 21st, ... times it is executed. Note that the special google::COUNTER value is used to identify which repetition is happening.

You can combine conditional and occasional logging with the following macro.

LOG_IF_EVERY_N(INFO, (size > 1024), 10) << "Got the " << google::COUNTER
                                           << "th big cookie";

Instead of outputting a message every nth time, you can also limit the output to the first n occurrences:

LOG_FIRST_N(INFO, 20) << "Got the " << google::COUNTER << "th cookie";

Outputs log messages for the first 20 times it is executed. Again, the google::COUNTER identifier indicates which repetition is happening.

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