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The journalctl command is a powerful tool used to query and view logs collected by systemd. To increase the size of log files size we , you can update the below settings.following settings in the /etc/systemd/journald.conf file.

Filter Logs by Service: journalctl -u service


vi /etc/systemd/journald.conf
[Journal]
Storage=volatile
#Compress=yes
#Seal=yes
#SplitMode=uid
#SyncIntervalSec=5m
RateLimitIntervalSec=0
RateLimitBurst=0
SystemMaxUse=
16M
500M
#SystemKeepFree=
SystemMaxFileSize=
4M
100M
#SystemMaxFiles=100
RuntimeMaxUse=
16M
1G
#RuntimeKeepFree=
RuntimeMaxFileSize=
4M
100M
#RuntimeMaxFiles=100
#MaxRetentionSec=
#MaxFileSec=1month
ForwardToSyslog=yes
#ForwardToKMsg=no
#ForwardToConsole=no
#ForwardToWall=yes
#TTYPath=/dev/console
#MaxLevelStore=debug
#MaxLevelSyslog=debug
#MaxLevelKMsg=notice
#MaxLevelConsole=info
#MaxLevelWall=emerg
#LineMax=48K
#ReadKMsg=yes
#Audit=yes

NOTE:To get more debug info, compile the component with debug symbols enabled. 

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