[JAVA] Introduced knowledge (wiki) on Ubuntu

Overview

As an information sharing Wiki, I wanted to run Knowledge on a PC with Ubuntu 14.04. In order to test the execution in the local environment, I put Vagrant in Mac Book Pro and built a disguise environment.

• Vagrant is a bit old, but please refer to Past article *

The OS installed in the virtual machine this time is Ubuntu 14.04. I will post a memo from zero to moving Knowledge. Click here for the figure after moving. It's a pretty modern UI!

Install Java

Proceed to access vagrant with ssh. Proceed to java installation.

Check the installable java version

It is different for users (jre) and developers (jdk).

If you want to install jre sudo apt search openjdk-\(\.\)\+-jre$

If you want to install jdk sudo apt search openjdk-\(\.\)\+-jdk$

Install by specifying the version

This time, install ** openjdk-8 **. As of 2020/04, it seems better to run knowledge with openjdk-8 because there were times when it could be executed.

If you want to install jre sudo apt install openjdk-8-jre

If you want to install jdk sudo apt install openjdk-8-jdk

Install tomcat

What is Tomcat in the first place?

This explanation is easy to understand. Simply put, it is good to recognize that it is "environment construction software for a program (Java Servlet) written in Java that you want to run on a web server". Since it is an environment construction software for Java programs, software (Apache, etc.) that processes HTTP requests from the browser is also required separately.

However, this Tomcat, 8080 port is free, and it also has a simple web server function to process http requests. This allows you to test the java Servlet with tomcat alone.

Install tomcat

Let's install Tomcat 9 this time. Normally, I prepare a user to run tomcat, but since it is vagrant, it is a little troublesome. I think the nice thing about virtual machines is that build & scrap is easy, so let's proceed as a vagrant user. Select the version from the tomcat download page. Alternatively, you can find the file by going to this path.

cd /opt curl -O https://downloads.apache.org/tomcat/tomcat-9/v9.0.34/bin/apache-tomcat-9.0.34.tar.gz tar -xzvf ./apache-tomcat-9.0.34.tar.gz sudo chown -R vagrant:vagrant /opt/apache-tomcat-9.0.34

Register with Ubuntu systemctl

You need to make ubuntu's systemctl management target recognize the tomcat downloaded this time. sudo vim /etc/systemd/system/tomcat.service Write the following code in.

[Unit]
Description=Apache Tomcat 9
After=network.target

[Service]
User=vagrant
Group=vagrant
Type=oneshot
PIDFile=/opt/apache-tomcat-9.0.34/tomcat.pid
RemainAfterExit=yes

ExecStart=/opt/apache-tomcat-9.0.34/bin/startup.sh
ExecStop=/opt/apache-tomcat-9.0.34/bin/shutdown.sh
ExecReStart=/opt/apache-tomcat-9.0.34/bin/shutdown.sh;/opt/apache-tomcat-9.0.34/bin/startup.sh

[Install]
WantedBy=multi-user.target

Gives read permission. sudo chmod 755 /etc/systemd/system/tomcat.service

Make the service executable. sudo systemctl enable tomcat

After that, you can run / stop / restart with the following code. sudo systemctl start[/stop/restart] tomcat

Try accessing ** http: // [vagrant machine IP]: 8080 ** to open the default Tomcat screen.

Place Knowledge

Knowledge installation

See Knowledge setup method. In short, you can download the knowledge war file and put it in the tomcat webapps folder.

In this procedure, you will put the war file in * / opt / apache-tomcat-9.0.34 / webapps *. Then restart Tomcat. sudo systemctl restart tomcat

This will unzip the war file. At this time, below the home of the user who runs tomcat The * .knowledge * file should have been created. if

--It doesn't work --I get a 404 error

If that happens, look at * knowledge / logs / app.log * and you will see the details of the error. ** When you access http: // [IP of vagrant machine]: 8080 / knowledge / **, you can open it safely.

At the end

I think that there are situations where Tomcat is used mainly when operating web UI business software. As mentioned in the explanation of Tomcat, the part that processes http requests is an extra function, so it should be used in combination with apache etc. I would like people who have spare capacity to do it.