DevOps Classroom Series – 29/Apr/2021

Deploying a Spring boot application to ubuntu

  • create a ubuntu vm
  • Install jdk 11
sudo apt update
sudo apt install openjdk-11-jdk -y
sudo useradd bootuser
sudo mkdir /usr/share/petclinic
sudo cp spring-petclinic-2.4.2.jar /usr/share/petclinic/spring-petclinic-2.4.2.jar
sudo chown bootuser:bootuser /usr/share/petclinic/spring-petclinic-2.4.2.jar
sudo chmod 500 /usr/share/petclinic/spring-petclinic-2.4.2.jar
  • Now create a file in /etc/systemd/system/springpetclinic.service with the following content
Description=A Spring Boot application

ExecStart=java -jar /usr/share/springpetclinic/spring-petclinic-2.4.2.jar

  • Now reload the system daemon and start the spring petclinic
sudo systemctl daemon-reload
sudo systemctl start springpetclinic.service
 sudo systemctl status springpetclinic.service
  • The logs of this application are generated in
    • /var/log/petclinic.log
    • /var/log/petclinicerrors.log
  • Individual log
2021-04-29 02:34:01.020 DEBUG 353 --- [nio-8080-exec-9] o.s.web.servlet.DispatcherServlet        : Completed 200 OK
# grok patterns
%{SYSLOGTIMESTAMP : datetime}%{SPACE}%{WORD:application}%{SPACE}(?<thread>java\[\d+\]:\s)%{TIMESTAMP_ISO8601}%{SPACE}%{LOGLEVEL:level}%{SPACE}(?<thread_info>\d+\s+---\s\[[\b\w*\d*-]*\]\s)%{JAVACLASS:class}%{SPACE}%{GREEDYDATA:logmessage}
  • Now install and configure filebeat to send the logs from the above two files to logstash running on 5045 port
  • edit the filebeat.yml file at /etc/filebeat/filebeat.yml
  • Now login into vm with logstash and create a new file /etc/logstash/conf.d/petclinic.conf
input {
    beats  {
        host => ""
        port => 5045
    grok {
        match => {"message" => "%{TIMESTAMP_ISO8601}%{SPACE}%{LOGLEVEL:level}%{SPACE}(?<thread_info>\d+\s+---\s\[[\b\w*\d*-]*\]\s)%{JAVACLASS:class}%{SPACE}%{GREEDYDATA:logmessage}"}
output {
	stdout {
		codec => rubydebug
    elasticsearch {
        hosts => ""
        index => "springpetclinic-%{+YYYY.MM.dd}"
  • Start the logstash service
sudo serivce 
  • Once the data is arrived create a index pattern in kibana
  • Now use kql to search the logs Refer Here

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