Starting with version 8.0, Red Hat Enterprise Linux (RHEL) no longer provides any version of the Apache Tomcat JAVA webserver/servlet as part of the RHEL distribution.[1]
Therefore, we have to install Tomcat via WAR file in the RHEL systems. The problem which arises is that it becomes difficult to start, stop or restart the Tomcat service as there is to service file installed, through which we could have easily used the command service tomcat start to start the service.
But there is a way through which we can create this service manually by writing a Systemd script. By placing this script in the /etc/systemd/system/ directory, we can use the service commands for managing the Tomcat Service.
Please share the Tomcat Service Creation Script.
This the Service Creation File. Copy and paste this file in the /etc/systemd/system/ directory.
The name of the file should be tomcat.service
[Unit]
Description=Apache Tomcat Web Application Container
Wants=network.target
After=network.target
[Service]
Type=forking
Environment=JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-0.el8_2.x86_64/jre
Environment=CATALINA_PID={{ tomcat_dir }}/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME={{ tomcat_dir }}/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1G -Djava.net.preferIPv4Stack=true'
Environment='JAVA_OPTS=-Djava.awt.headless=true'
ExecStart={{ tomcat_dir }}/tomcat/bin/startup.sh
ExecStop={{ tomcat_dir }}/tomcat/bin/shutdown.sh
SuccessExitStatus=143
RestartSec=10
Restart=always
[Install]
WantedBy=multi-user.target
Now you can easily manage the Tomcat Service with the Systemd Commands, even in RHEL8.
Related
So I'm deploying my Spring Boot application on an Ubuntu LTS Server. It is built with maven and running with embedded Tomcat.
I'm still new to the deployment process, what I did was:
Log into server via ssh
use scp to upload my_application.zip
unzip it in ssh
java -jar my_application.jar
Now all of that works perfectly fine and I've been using it like that for quiet some time. Now I have to make the Application to stay online and available after logging out of the shell.
I have read some documentation about running processes in background on Linux and I've tried it with nohup java -jar myApplication.jar &, with the screen command and with bg. All of them worked fine while I'm logged into the ssh.
Here comes my problem:
As soon as I end the ssh session the Web App is still available (so the process clearly didn't stop) but it just looks & behaves really weird.
CSS is not applied, JS does not work etc.
My guess would be that some paths or file system accesses are messed up, but I have no idea at all how that could origin from the ssh session.
(When I log back into ssh everything is working fine again)
Would be great if someone has a clue here
If your server has encrypted home directory, it will get re-encrypted once you log out and therefore your script will stop working. It does not have a lot of sense to have encrypted homes on servers so you can disable it.
Or just run the script from different directory and avoid working with files under home directory.
I think you should use systemd for this case.
Also You can add new system user for your app.
You can find more information here:
Spring Boot: 59.2.2 Installation as a systemd service
Ubuntu Wiki: Systemd For UpstartUsers
For example:
Create file myunit.service
[Unit]
Description=MySpringService
After=syslog.target
After=network.target
After=mysql.service
[Service]
Type=forking
PIDFile=/work/www/myunit/shared/tmp/pids/service.pid
WorkingDirectory=/work/www/myunit/current
User=myunit
Group=myunit
Environment=RACK_ENV=production
OOMScoreAdjust=-1000
ExecStart=/usr/local/bin/bundle exec service -C /work/www/myunit/shared/config/service.rb --daemon
ExecStop=/usr/local/bin/bundle exec service -S /work/www/myunit/shared/tmp/pids/service.state stop
ExecReload=/usr/local/bin/bundle exec service -S /work/www/myunit/shared/tmp/pids/service.state restart
TimeoutSec=300
[Install]
WantedBy=multi-user.target
Copy file to /etc/systemd/system/
Run:
systemctl enable myunit
systemctl start myunit
I've generated a Spring Boot web application using Spring Initializr, using embedded Tomcat and package as an executable JAR file.
I started my application on Ubuntu 14.04 LTSwith
java -DAPPKEY=oracle -Dspring.profiles.active=oracle -jar licence-0.0.1-SNAPSHOT.jar
But after some hours the application was down, the process was not running anymore. Was this a proper way to start the application ?
I have no clue why the process shutdown
if you need to run your application as a service take a look at the installation guide in the spring boot doc:
https://docs.spring.io/spring-boot/docs/current/reference/html/deployment-install.html
As you can see if you are using init.d services you can link the jar inside the init.d directory.
The fat jar contains the init scripts:
sudo ln -s /var/myapp/myapp.jar /etc/init.d/myapp
I have Jboss 4.2.3 installed and Windows Service,Log on AS is set to Local System for that service. When I deploying a small war project which is suppose to launch notepad.exe, jboss server runs the command but does not launch notepad.exe
When I run the JBoss 4.2.3 from command line with command run.bat -b 0.0.0.0 it launches notepad.exe from war project file Also when I change Log on AS for windows service to Current Windows User from which I am currently logged in and restart Jboss service it launches notepad.exe
I want to run Jboss service as Local System and have war file execute the exe, Can any one let me know how can I do that ?
I am new to Weblogic. And I want to enable the JMX on Weblogic 12c.
As I searched on stackoverflow, I found this:
Add the following JVM parameters to your Weblogic startup scripts:
-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8888 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false
However I couldn't find this script.
So where is it?
Thank you very much!
There are a few weblogic startup (and shutdown scripts), one for Windows (ending in "cmd") and one for Unix/Linux (ending in "sh"). The filename begins startWebLogic and it was installed in your weblogic/bin folder.
Per the documentation (linked above),
The startWebLogic script does the following:
Sets environment variables by invoking DOMAIN_NAME\bin\setDomainEnv.cmd (setDomainEnv.sh on UNIX), where DOMAIN_NAME is the directory in which you located the domain; for example, WL_HOME\user_projects\domains\DOMAIN_NAME, and where WL_HOME is the location in which you installed WebLogic Server.
Invokes the java weblogic.Server command, which starts a JVM that is configured to run a WebLogic Server instance.
I'm looking into installing Jenkins, in the instructions it says
"Easy installation: Just java -jar jenkins.war, or deploy it in a
servlet container. No additional install, no database."
I understand the servlet container method, but does the above statement mean that just installing Java and running the .war file will somehow spinup a webserver and start serving http request ?
Yes, the war file contains the built-in Winstone servlet container, and running that command will start it and make it listen for requests on port 8080.
Edit: Jenkins 1.535 and above bundles Jetty (rather than Winstone). You can still run it with java -jar jenkins.war.
Jenkins comes bundled with Winstone, a very lightweight servlet container. As such, Jenkins can be started from the command line as stated by the instructions without any additional software installation.