How to update Data Plane App logging

[#1]

OBJECTIVE:

Updating the log configs of DPS App. Example default log file is set to logs/application.log which can be changed or Updating the log level to DEBUG for troubleshooting. Since DP App will be running in docker we can use docker commands to update them.

STEPS:

1. Find the docker container running DP App on the host running DPS. Use "docker ps"

[root@dps-node ~]#docker ps
CONTAINER ID        IMAGE                                        COMMAND                  CREATED             STATUS              PORTS                                                                      NAMES
abd412417907        hortonworks/dlm-app:1.1.0.0-41               "runsvdir /etc/sv"       28 hours ago        Up 2 hours          9011/tcp                                                                   dlm-app
62620e578e31        hortonworks/dp-app:1.1.0.0-390               "/bootstrap.sh"          2 days ago          Up 16 minutes       0.0.0.0:80->80/tcp, 0.0.0.0:443->443/tcp, 9000/tcp                         dp-app
38dda17dfdf4        hortonworks/dp-cluster-service:1.1.0.0-390   "./docker_service_st…"   2 days ago          Up 2 days           9009-9010/tcp                                                           

Copy the container ID, from above example it is "62620e578e31"

2. Get the current logback.xml file

[root@dps-node ~]# docker exec -it 62620e578e31 /bin/cat /usr/dp-app/conf/logback.xml > logback.xml

3. Update the configs in local logback.xml which we redirected in above command. In below I have updated the location from default logs/application.logs to /usr/dp-app/logs/.

<configuration>

  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>/usr/dp-app/logs/application.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <!-- Daily rollover with compression -->
.
.


  <appender name="AKKA" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>/usr/dp-app/logs/akka.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
.
.
.

    </encoder>
  </appender>


  <appender name="ACCESS_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>/usr/dp-app/logs/access.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
   
.
.

We can also update the log level .

  <root level="DEBUG">
    <appender-ref ref="FILE"/>
  </root>

4. If needed make a backup of the original logback.xml file and cp the updated logback.xml

[root@dps-node ~]#docker exec -it 62620e578e31 /bin/cp /usr/dp-app/conf/logback.xml /usr/dp-app/conf/logback.xml.bck

[root@dps-node ~]# docker exec -i 62620e578e31 tee /usr/dp-app/conf/logback.xml < logback.xml

5. Restart the docker container is required to make changes effective.

[root@dps-node ~]# docker restart 62620e578e31

6. You can verify if the changes have updated.

[root@dps-node ~]# docker exec -it 62620e578e31 /bin/ls -lrt /usr/dp-app/logs
total 64
-rw-r--r-- 1 root root     0 Jun  6 20:50 access.log
-rw-r--r-- 1 root root 62790 Jun  6 21:27 application.log