- Configure Alluxio
- Restart Alluxio And Log Server
- Verify Log Server Has Started
Alluxio supports sending logs to a remote log server over the network. This feature can be useful to system administrators who have to perform the task of log collection. With remote logging, the log files, e.g. master.log, worker.log, etc. on all Alluxio servers will be readily available on a designated and configurable directory on the log server.
Refer to Running Alluxio on a cluster for instructions in deploying Alluxio in a cluster.
By default, remote logging is not enabled. To enable Alluxio remote logging, you can set
three environment variables:
There is no requirement on where the log server must run, as long as the other Alluxio servers have access to it. In our example, we run the log server on the same machine as a master.
Enable Remote Logging with Environment Variables
Suppose the hostname of the log server is
AlluxioLogServer, and the port is
conf/alluxio-env.sh, add the following lines:
ALLUXIO_LOGSERVER_HOSTNAME=AlluxioLogServer ALLUXIO_LOGSERVER_PORT=45010 ALLUXIO_LOGSERVER_LOGS_DIR=/tmp/alluxio_remote_logs
Restart Alluxio And Log Server
After making the modification to configuration, you need to restart the log server first. Then you can start Alluxio. This ensures that the logs that Alluxio generates during start-up phase will also go to the log server.
Start Log Server
On the log server, execute the following command.
$ ./bin/alluxio-start.sh logserver
On Alluxio master, execute the following command.
$ ./bin/alluxio-start.sh all SudoMount
Verify Log Server Has Started
First, ssh to the machine on which log server is running.
Second, go to the directory where the log server has been configured to store logs received from
other Alluxio servers. In the above example, the directory is
$ cd /tmp/alluxio_remote_logs $ ls master proxy secondary_master worker $ ls -l master/ ... -rw-r--r-- 1 alluxio alluxio 26109 Sep 13 08:49 126.96.36.199.log ...
You can see that the log files are put into different folders according to their type. Master logs are put
in the folder
master, worker logs are put in folder
worker, etc. Within each folder, log files from
different workers are distinguished by the IP/hostname of the machine on which the server has been running.