Deleting logstash logs older than 4 days

My log4j.properties like below. How can i edit it to delete logs older than 4 days

status = error
name = LogstashPropertiesConfig

appender.console.type = Console
appender.console.name = plain_console
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = [%d{ISO8601}][%-5p][%-25c] %m%n

appender.json_console.type = Console
appender.json_console.name = json_console
appender.json_console.layout.type = JSONLayout
appender.json_console.layout.compact = true
appender.json_console.layout.eventEol = true

appender.rolling.type = RollingFile
appender.rolling.name = plain_rolling
appender.rolling.fileName = ${sys:ls.logs}/logstash-${sys:ls.log.format}.log
appender.rolling.filePattern = ${sys:ls.logs}/logstash-${sys:ls.log.format}-%d{yyyy-MM-dd}-%i.log.gz
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = [%d{ISO8601}][%-5p][%-25c] %-.10000m%n
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size = 100MB

appender.json_rolling.type = RollingFile
appender.json_rolling.name = json_rolling
appender.json_rolling.fileName = ${sys:ls.logs}/logstash-${sys:ls.log.format}.log
appender.json_rolling.filePattern = ${sys:ls.logs}/logstash-${sys:ls.log.format}-%d{yyyy-MM-dd}-%i.log.gz
appender.json_rolling.policies.type = Policies
appender.json_rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.json_rolling.policies.time.interval = 1
appender.json_rolling.policies.time.modulate = true
appender.json_rolling.layout.type = JSONLayout
appender.json_rolling.layout.compact = true
appender.json_rolling.layout.eventEol = true
appender.json_rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.json_rolling.policies.size.size = 100MB


rootLogger.level = ${sys:ls.log.level}
rootLogger.appenderRef.console.ref = ${sys:ls.log.format}_console
rootLogger.appenderRef.rolling.ref = ${sys:ls.log.format}_rolling

# Slowlog

appender.console_slowlog.type = Console
appender.console_slowlog.name = plain_console_slowlog
appender.console_slowlog.layout.type = PatternLayout
appender.console_slowlog.layout.pattern = [%d{ISO8601}][%-5p][%-25c] %m%n

appender.json_console_slowlog.type = Console
appender.json_console_slowlog.name = json_console_slowlog
appender.json_console_slowlog.layout.type = JSONLayout
appender.json_console_slowlog.layout.compact = true
appender.json_console_slowlog.layout.eventEol = true

appender.rolling_slowlog.type = RollingFile
appender.rolling_slowlog.name = plain_rolling_slowlog
appender.rolling_slowlog.fileName = ${sys:ls.logs}/logstash-slowlog-${sys:ls.log.format}.log
appender.rolling_slowlog.filePattern = ${sys:ls.logs}/logstash-slowlog-${sys:ls.log.format}-%d{yyyy-MM-dd}-%i.log.gz
appender.rolling_slowlog.policies.type = Policies
appender.rolling_slowlog.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling_slowlog.policies.time.interval = 1
appender.rolling_slowlog.policies.time.modulate = true
appender.rolling_slowlog.layout.type = PatternLayout
appender.rolling_slowlog.layout.pattern = [%d{ISO8601}][%-5p][%-25c] %.10000m%n
appender.rolling_slowlog.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling_slowlog.policies.size.size = 100MB

appender.json_rolling_slowlog.type = RollingFile
appender.json_rolling_slowlog.name = json_rolling_slowlog
appender.json_rolling_slowlog.fileName = ${sys:ls.logs}/logstash-slowlog-${sys:ls.log.format}.log
appender.json_rolling_slowlog.filePattern = ${sys:ls.logs}/logstash-slowlog-${sys:ls.log.format}-%d{yyyy-MM-dd}-%i.log.gz
appender.json_rolling_slowlog.policies.type = Policies
appender.json_rolling_slowlog.policies.time.type = TimeBasedTriggeringPolicy
appender.json_rolling_slowlog.policies.time.interval = 1
appender.json_rolling_slowlog.policies.time.modulate = true
appender.json_rolling_slowlog.layout.type = JSONLayout
appender.json_rolling_slowlog.layout.compact = true
appender.json_rolling_slowlog.layout.eventEol = true
appender.json_rolling_slowlog.policies.size.type = SizeBasedTriggeringPolicy
appender.json_rolling_slowlog.policies.size.size = 100MB

logger.slowlog.name = slowlog
logger.slowlog.level = trace
logger.slowlog.appenderRef.console_slowlog.ref = ${sys:ls.log.format}_console_slowlog
logger.slowlog.appenderRef.rolling_slowlog.ref = ${sys:ls.log.format}_rolling_slowlog
logger.slowlog.additivity = false

logger.licensereader.name = logstash.licensechecker.licensereader
logger.licensereader.level = error

I'm using a simple crontab entry that takes care of this in my setup: Logrotate

how do you add a cron tab entry ?

Did you try to Google : how to add crontab job on Linux..?

I personally use Ansible to manage my hosts, including the crontab entry: https://docs.ansible.com/ansible/latest/modules/cron_module.html

why can't we use log4j.properties to delete logs ?

in elastic log4j.properties, we can delete logs, but why not in logstash ?

I think you can use log4j.properties, why not?
For me it was just more difficult than using the crontab.

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