Hi everyone,
I have just installed Elasticsearch 7.5.2 on Ubuntu 16.04 and I would like to configure Elasticsearch in order to retain only two log compressed files in /var/log/elasticsearch.
I have modified log4j2.properties (/etc/elasticsearch) according to the documentation.
######## Server JSON ############################
appender.rolling.type = RollingFile
appender.rolling.name = rolling
appender.rolling.fileName = ${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}_server.json
appender.rolling.layout.type = ESJsonLayout
appender.rolling.layout.type_name = server
appender.rolling.filePattern = ${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}-%d{yyyy-MM-dd}-%i.json.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.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size = 128MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.action.type = Delete
appender.rolling.strategy.action.basepath = ${sys:es.logs.base_path}
appender.rolling.strategy.action.condition.type = IfFileName
appender.rolling.strategy.action.condition.glob = ${sys:es.logs.cluster_name}-*
appender.rolling_old.strategy.action.condition.nested_condition.type = IfLastModified
appender.rolling_old.strategy.action.condition.nested_condition.age = 2D
It is correct? Is there any way to verify it it is working?
Thank in advance,
Regards 
Update
I have modified log4j2.properties in order to roll logs after 100MB (appender.rolling.policies.size.size) and keep only 10 compressed files (appender.rolling.strategy.max).
######## Server JSON ############################
appender.rolling.type = RollingFile
appender.rolling.name = rolling
appender.rolling.fileName = ${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}_server.json
appender.rolling.layout.type = ESJsonLayout
appender.rolling.layout.type_name = server
appender.rolling.filePattern = ${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}-%d{yyyy-MM-dd}-%i.json.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.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size = 100MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 10
