how to redirect systemd logs in to the file

Redirect systemd logs in file

Step 1:

Open service file and update following tags, in this tutorial we use tomcat service.

StandardOutput=syslog

StandardError=syslog

SyslogIdentifier=tomcat

vi  /lib/systemd/system/tomcat.service

[Unit]

Description=Apache Tomcat Web Application Container

After=syslog.target network.target

[Service]

Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/jre

Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid

Environment=CATALINA_HOME=/opt/tomcat

Environment=CATALINE_BASE=/opt/tomcat

Environment='CATALINE_OPTS=-Xms128M -Xmx765M -server -XX:+UseParallelGC'

Environment='JAVA_OPTS=-Djava.awt.haedless=true -Djava.security.egd=file:/dev/./urandom'

ExecStart=/opt/tomcat/bin/startup.sh

ExecStop=/bin/kill -15 $MAINPID

User=tomcat

Group=tomcat

StandardOutput=syslog

StandardError=syslog

SyslogIdentifier=tomcat

[Install]

WantedBy=multi-user.target

Step 2:

Create file in rsyslog.d directory in any name

vi /etc/rsyslog.d/tomcat.conf

if $programname == 'tomcat' then /var/log/tomcat/file.log

& stop

Step 3:

Restart rsyslog and tomcat

systemctl  daemon-reloadsystemctl restart rsyslog tomcat

Step 4: 

Check log file

cat  /var/log/tomcat/file.log

Thanks,

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