Enabling httpd log rotation for Hue

Several log files, such as access logs and error logs, are produced by the Apache HTTP server. Over time, these files can grow in size and can cause disk issues. You can prevent this problem by using Apache's rotatelogs utility and defining when to rotate logs – either based on a time interval or maximum size of the log.

You can configure the Apache server to rotate the logs when a certain filesize is reached (for example, 5 Bytes or 10 KBytes) or at a set time interval (for example, daily or weekly), or both. If you want to specify both the time and size, the size must be specified after the time. Log rotation occurs whenever time or size limits are reached.

The log files are generated as per the configurations defined in the httpd.conf file.

The rotatelogs utility must be present on your Operating System, and you must know its location so that you can use it. Run the following command from the Hue load balancer host system to get the path of the rotatelogs utility:

[root@example-domain-hue-HUE_LOAD_BALANCER]# which rotatelogs
/usr/sbin/rotatelogs

Log in to Cloudera Manager as an Administrator.
Go to Clusters > Hue service > Configuration.
Configure the log rotation policy based on your criteria in the Load Balancer Advanced Configuration Snippet (Safety Valve) for httpd.conf field.
To rotate logs whenever the specific file size is reached, add the following lines:
```
CustomLog "|/usr/sbin/rotatelogs /var/log/hue-httpd/access_log.%Y-%m-%d-%H_%M_%S [***FILE-SIZE***](B|K|M|G)" common
ErrorLog "|/usr/sbin/rotatelogs /var/log/hue-httpd/error_log.%Y-%m-%d-%H_%M_%S [***FILE-SIZE***](B|K|M|G)"
```
For example:
```
CustomLog "|/usr/sbin/rotatelogs /var/log/hue-httpd/access_log.%Y-%m-%d-%H_%M_%S 5B" common
ErrorLog "|/usr/sbin/rotatelogs /var/log/hue-httpd/error_log.%Y-%m-%d-%H_%M_%S 5B"
```
This configuration rotates the log file whenever it reaches a size of 5 bytes, and the suffix to the log file name will be created with the format access_log. YYYY-mm-dd-HH_MM_SS and error_log.YYYY-mm-dd-HH_MM_SS.
To rotate logs daily, add the following lines:
```
CustomLog "|/usr/sbin/rotatelogs -l /var/log/hue-httpd/access_log.%Y-%m-%d-%H_%M_%S 86400" common 
ErrorLog "|/usr/sbin/rotatelogs -l /var/log/hue-httpd/error_log.%Y-%m-%d-%H_%M_%S  86400"
```
This creates the files /var/log/access_log.yyyy.mm.dd and /var/log/error_log.yyyy.mm.dd where yyyy is the year, mm is the month, and dd is the day of the month. The log operation switches to a new file every day at midnight, local time.
For more information, see rotatelogs - Piped logging program to rotate Apache logs.
Click Save Changes.
Restart the affected services.