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# Frequently asked questions
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## Which browser should I use to operate Opendaylight SDN-R User interface?
An actual version of [Google Chromium](https://www.chromium.org/getting-involved/download-chromium "Download Chromium") or
[Google Chrome](https://www.google.de/search?q=chrome+download&oq=chrome+download&aqs=chrome..69i57j0l5.2718j0j4&sourceid=chrome&ie=UTF-8 "Download Chrome") is recommended.
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## How to enable detailed logs in karaf for SDN-R applications
If you like to see more details in karaf logs for the NetConf communication between ODL and NetConf servers (mediators/devices) please invoke the following commands in the karaf console.
```
# Logging settings (on)
log:set DEBUG org.opendaylight.mwtn
log:set TRACE org.opendaylight.netconf
log:set TRACE com.highstreet.technologies.odl.app
```
Please note, setting the debug level to 'TRACE' may impact the performance on the controller. In production environment make sure to set back the debug level to 'INFO' as soon possible.
```
# Logging settings (off)
log:set INFO org.opendaylight.mwtn
log:set INFO org.opendaylight.netconf
log:set INFO com.highstreet.technologies.odl.app
```
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## Which commands should be used to analyse karaf logs?
```
cd $ODL_KARAF_HOME/data/log
rm *.txt
grep -anr --include=*.log* "| ERROR |" . | grep 2018 >> 01-error.txt
grep -anr --include=*.log* "RemoteDevice{" . | grep 2018 >> 02-devices.txt
grep -anr --include=*.log* "RemoteDevice{" . | grep "Unable to build schema context, unsatisfied imports" | grep 2018 >> 03-schema-issue.txt
grep -anr --include=*.log* "Matched request:" . | grep 2018 >> 04-matched-request.txt
grep -anr --include=*.log* "network-element" . | grep 2018 >> 05-network-element.txt
grep -anr --include=*.log* "urn:onf:params:xml:ns:yang:core-model" . | grep 2018 >> 06-core-module.txt
grep -anr --include=*.log* "PerformanceManagerTask" . | grep 2018 >> 07-pm-tick.txt
grep -anr --include=*.log* "Unable to read NE data for mountpoint" . | grep 2018 >> 08-unable-to-read.txt
grep -anr --include=*.log* "LKCYFL79Q01M01MSS801" . | grep 2018 >> 09-LKCYFL79Q01M01MSS801.txt
```
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