Rick Dicaire writes: > Hi, new to list and kea, using 1.6 from ISC's cloudsmith.io deb repo on > Ubuntu 18.04 LTS. > I have a working dhcp4 and ddns configuration. > I'm now trying to customize logging to output json for easy ingestion by > ELK stack. I'm working with dhcp-ddns first. > I'm using this pattern:
=> the pattern is given to log4cplus with as reference: https://log4cplus.sourceforge.io/docs/html/classlog4cplus_1_1PatternLayout.html > "pattern": > "{\"date\":\"%D{%Y-%m-%dT%H:%M:%S.%q%z}\",\"kea.ddns.log.level\": > \"%p\",\"kea.ddns.log.component\":\"%c\",\"kea.ddns.log.pid\":\"%i\",\"kea.dd > ns.log.data\": > \"%m\"}\n" => hum, you assume here that anything in between two (escaped) quotes makes a valid JSON string. Of course this is not true (reference here is ECMA 404) and the multi-line issue is only one of the possible problems. > As I understand json, multiline is not valid so I'm trying to figure out if > the format of %m can be modified to output as single line? => log4cplus offers some formating but only a subset of printf so nothing powerful enough. I am afraid you have to do the to JSON translation on the other side i.e. in log files or (new)syslog. BTW there are already a lot of log filters so if you find a suitable one please share here. I know for instance that Jenkins has a log file to XML filter tool... I am looking for direct solution in log4j (log4cplus was designed from this). There are some ideas using %m but we know it is not enough. Some suggest to write a JSON Appender, can be done with not trivial coding... (reference https://github.com/michaeltandy/log4j-json, I found more but for log4j2). I can see 3 problems to do this in Kea: - there is no hook in Kea for logging i.e. no easy place to insert code - the JSON code is in another and later library (backward dependency) - it requires significant manpower to develop. Regards Francis Dupont <[email protected]> _______________________________________________ ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users. Kea-users mailing list [email protected] https://lists.isc.org/mailman/listinfo/kea-users
