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There are lots of guides online that go over how to accomplish each of these tasks, but it seems many of them leave out one or two steps that then lead to questions on sites like this one. That said, DigitalOcean puts out some of the better walk-throughs for common software packages.
That said, AskUbuntu isn't really a site where one drops links and walks away. <a href="https://en.wikipedia.org/wiki/Link_rot" rel="nofollow noreferrer">Link rot</a> is a real thing and should be avoided when possible. So, with this in mind, let's install some software.
<h3>Apache2 on Ubuntu Server 18.04</h3>
This is how one would install Apache on an up-to-date Ubuntu 18.04:
<ol start="0">
<li>Connect to the machine</li>
<li>Update <code>apt</code>:
<pre><code>sudo apt update
</code></pre>
</li>
<li>Install Apache:
<pre><code>sudo apt install apache2
</code></pre>
</li>
<li>Allow Apache through the firewall by first listing applications <code>ufw</code> is aware of:
<pre><code>sudo ufw app list
</code></pre>
This will give you something like:
<pre><code>Available applications:
 Apache
 Apache Full
 Apache Secure
 OpenSSH
</code></pre>
Allow Apache:
<pre><code>sudo ufw allow 'Apache'
</code></pre>
Confirm the status:
<pre><code>sudo ufw status
</code></pre>
You should see something similar to this:
<pre><code>Status: active

To Action From
-- ------ ----
OpenSSH ALLOW Anywhere 
Apache ALLOW Anywhere 
OpenSSH (v6) ALLOW Anywhere (v6) 
Apache (v6) ALLOW Anywhere (v6)
</code></pre>
</li>
<li>Test the web server works in the browser by entering the server's IP address. You should see a stock Apache page with the Ubuntu logo and some configuration information.</li>
</ol>
Source: <a href="https://www.digitalocean.com/community/tutorials/how-to-install-the-apache-web-server-on-ubuntu-18-04" rel="nofollow noreferrer">DigitalOcean</a>
<h3>Install Tomcat 8.5</h3>
Tomcat 8.5 was the version available with Ubuntu 16.04 and Tomcat 9 was the version available for 18.04. That said, if you really must have 8.5 on your 18.04 server, this is how you can do it.
(Optional Steps — To be performed only if you have disconnected from the server after installing Apache)
<ol start="0">
<li>Connect to the machine</li>
<li>Update <code>apt</code>
<pre><code>sudo apt update
</code></pre>
</li>
</ol>
Now let's install Tomcat 8.5:
<ol>
<li>Install the Java Development Kit:
<pre><code>sudo apt-get install default-jdk
</code></pre>
</li>
<li>Create a group and user for Tomcat to use:
<pre><code>sudo groupadd tomcat
sudo useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat
</code></pre>
</li>
<li>Download Tomcat 8.5 from <a href="http://tomcat.apache.org/download-80.cgi" rel="nofollow noreferrer">the Apache Tomcat website</a>. As of this writing, 8.5.65 is the most recent version. You can download this via <code>curl</code>:
<pre><code>curl -O https://downloads.apache.org/tomcat/tomcat-8/v8.5.65/bin/apache-tomcat-8.5.65.tar.gz
</code></pre>
</li>
<li>Tomcat will be saved to the <code>/opt/tomcat</code> directory, so let's get that set up:
<pre><code>sudo mkdir /opt/tomcat
sudo tar xzvf apache-tomcat-8*tar.gz -C /opt/tomcat --strip-components=1
</code></pre>
</li>
<li>Now let's set the permissions correctly:
<pre><code>cd /opt/tomcat
sudo chgrp -R tomcat /opt/tomcat
sudo chmod -R g+r conf
sudo chmod g+x conf
sudo chown -R tomcat webapps/ work/ temp/ logs/
</code></pre>
</li>
<li>Next we need to get the current location of Java:
<pre><code>sudo update-java-alternatives -l
</code></pre>
You will see something like this:
<pre><code>java-1.8.0-openjdk-amd64 1081 /usr/lib/jvm/java-1.8.0-openjdk-amd64
</code></pre>
The path will be needed for <code>JAVA_HOME</code>, which will be set in the next step.</li>
<li>Create a systemd <code>.service</code> file for Tomcat using an editor of your choice:
<pre><code>sudo vi /etc/systemd/system/tomcat.service
</code></pre>
Paste the following into the file:
<pre><code>[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'

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

User=tomcat
Group=tomcat
UMask=0007
RestartSec=10
Restart=always

[Install]
WantedBy=multi-user.target
</code></pre>
Remember to change <code>JAVA_HOME</code> to the path from the last step, and keep <code>/jre</code> at the end of the path. Once done, save and close the file.</li>
<li>Reload the systemd daemon:
<pre><code>sudo systemctl daemon-reload
</code></pre>
</li>
<li>Start Tomcat:
<pre><code>sudo systemctl start tomcat
</code></pre>
Confirm it's working:
<pre><code>sudo systemctl status tomcat
</code></pre>
</li>
<li>Allow Tomcat through the firewall:
<pre><code>sudo ufw allow 8080
</code></pre>
And then test the installation with <code>http://server_domain_or_IP:8080</code></li>
<li>Set Tomcat to automatically start at boot:
<pre><code>sudo systemctl enable tomcat
</code></pre>
</li>
<li>Now to configure the management interface. Open the configuration XML file and set a decent login and password:
<pre><code>sudo vi /opt/tomcat/conf/tomcat-users.xml
</code></pre>
You'll see something like this:
<pre><code>&lt;tomcat-users ...&gt;
 &lt;user username=&quot;crazyTown&quot; password=&quot;superSecretPassword!123&quot; roles=&quot;manager-gui,admin-gui&quot;/&gt;
&lt;/tomcat-users&gt;
</code></pre>
Save the file.</li>
<li>Restart Tomcat:
<pre><code>sudo service tomcat restart
</code></pre>
</li>
<li>Test the web interface again in the browser.</li>
</ol>
Source: <a href="https://www.digitalocean.com/community/tutorials/how-to-install-apache-tomcat-8-on-ubuntu-16-04" rel="nofollow noreferrer">DigitalOcean</a>
<h3>mod_jk for Apache</h3>
This is the final step.
(Optional Steps — To be performed only if you have disconnected from the server after installing Apache)
<ol start="0">
<li>Connect to the machine
</li>
<li>Update <code>apt</code>
<pre><code>sudo apt update
</code></pre>
</li>
<li>Install <code>mod_jk</code>:
<pre><code>sudo apt install libapache2-mod-jk
</code></pre>
</li>
<li>Enable the redirect port on Tomcat:
<pre><code>sudo vi /opt/tomcat/server.xml
</code></pre>
</li>
<li>Uncomment the line that looks like this:
<pre><code>&lt;Connector port=&quot;8009&quot; protocol=&quot;AJP/1.3&quot; redirectPort=&quot;8443&quot; /&gt;
</code></pre>
</li>
<li>Create a <code>workers.properties</code> file for Apache:
<pre><code>sudo vi /etc/apache2/workers.properties
</code></pre>
</li>
<li>Paste the following into the new file:
<pre><code># Define one worker using AJP13
worker.list=worker1

# Set the properties
worker.worker1.type=ajp13
worker.worker1.host=localhost
worker.worker1.port=8009
</code></pre>
</li>
<li>Instruct Apache to use the file:
<pre><code>sudo vi /etc/apache2/mods-available/jk.conf
</code></pre>
Find the <code>JkWorkersFile</code> property and set it to the file you just created:
<pre><code>JkWorkersFile /etc/apache2/workers.properties
</code></pre>
</li>
<li>Finally, ensure Apache passes through to Tomcat:
<pre><code>sudo vi /etc/apache2/sites-enabled/000-default.conf
</code></pre>
Then add this to your <code>&lt;VirtualHost *:80&gt;</code> configuration:
<pre><code>JkMount /api worker1
</code></pre>
</li>
<li>Restart Tomcat and Apache:
<pre><code>sudo service tomcat restart
sudo service apache2 restart
</code></pre>
</li>
</ol>
Source: My endless configuration notes in Evernote ...
This should give you everything you need to get these three pieces of software working together. This was tested in a VirtualBox VM running Ubuntu Server 18.04.5 LTS.

Does anyone know a good guide to set up Apache2 and Tomcat8.5 on an Ubuntu 18.04? (Including the Apache Tomcat Connectors: mod_jk)

Guide to set up Apache2 and Tomcat8.5 on an Ubuntu 18.04?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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有谁知道在Ubuntu18.04上设置Apache2和Tomcat8.5的好指南吗？(包括Apache连接器: mod_jk)

问Ubuntu18.04上设置Apache2和Tomcat8.5的指南？
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