Build Apache and Tomcat environment with Docker. By the way, Maven & Java cooperation

Overview

I want to make a web application with Java, so I'll try to mess up the local environment! !! I don't want to depend on the IDE, so I'll do my best to create a command-based environment (tsu ・ Д ・)

The resulting environment

• macOS Sierra 10.12.6
• Docker version 17.09.0-ce
• Apache 2.4.6
• Tomcat9.0.1
• Maven 3.5.0
• Java 8

Build a Docker environment

Create each container and attach them with docker-compose.yml at the end. For the time being, I want to make something that works at least and customize it in the future!

Apache container creation

I personally want to study apache on centos, so install it and create an image

Dockerfile

FROM centos:7

RUN yum -y update && yum clean all
RUN yum -y install httpd httpd-devel gcc* make && yum clean all

# mod_jk conf files
ADD httpd-proxy.conf /etc/httpd/conf.d/

# Simple startup script to avoid some issues observed with container restart 
ADD run-httpd.sh /run-httpd.sh
RUN chmod -v +x /run-httpd.sh

CMD ["/run-httpd.sh"]

httpd-proxy.conf

# forward to tomcat container
ProxyPass / ajp://tomcat:8009/

run-httpd.sh

#!/bin/bash

# Make sure we're not confused by old, incompletely-shutdown httpd
# context after restarting the container.  httpd won't start correctly
# if it thinks it is already running.
rm -rf /run/httpd/* /tmp/httpd*

exec /usr/sbin/apachectl -DFOREGROUND

Tomcat container creation

Dockerfile

FROM tomcat:9.0.1-alpine

MAINTAINER Uchiyama <[email protected]>

ADD tomcat-users.xml /usr/local/tomcat/conf/
ADD context.xml /usr/local/tomcat/webapps/manager/META-INF/context.xml

RUN rm -rf /usr/local/tomcat/webapps/ROOT

CMD ["catalina.sh", "run"]

tomcat-users.xml

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
  <role rolename="manager-script"/>
  <user username="manager" password="manager!" roles="manager-script"/>
</tomcat-users>

To allow tomcat manager to run on anything other than the hostname localhost. See this stackOverflow for details.

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<Context antiResourceLocking="false" privileged="true" >
<!--
  <Valve className="org.apache.catalina.valves.RemoteAddrValve"
         allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />
-->
  <Manager sessionAttributeValueClassNameFilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\$1)?|java\.util\.(?:Linked)?HashMap"/>
</Context>

Link with docker-compose

docker-compose.yml

version: '3'
services:
  httpd:
    container_name: httpd-container
    build: ./docker/httpd
    ports:
      - "80:80"
  tomcat:
    container_name: tomcat-container
    build: ./docker/tomcat
    expose:
      - "8009"
volumes:
  data: {}

Try to move

zsh

docker-compose up -d --build
docker-compose ps

Confirm that the container has started and click the URL below to see the tomcat home page. http://localhost/

If it doesn't work, check the access log of httpd or tomcat container to see how far you have reached.

zash

docker exec -it httpd-container tail -f /etc/httpd/logs/access_log
docker exec -it tomcat-container1 tail -f /usr/local/tomcat/logs/localhost_access_log.`date +%Y-%m-%d`.log

Create Java application with Maven

Install maven

zsh

brew install maven
mvn -v

Create a project (template) with Maven

zsh

mvn archetype:generate \ #Project creation
-DgroupId=tech.ucwork \ #Package name specification
-DartifactId=myapp \ #Application name specification
-DarchetypeArtifactId=maven-archetype-webapp #Initial application format specification (web)
-DinteractiveMode=false #Do not run interactively

Hello World display in Java

Directory structure

I forgot which site I referred to, but I will create a file like this

zsh

$ tree -NL 5 src                                                                                                                     +[master]
src
└── main
    ├── java
    │   └── tech
    │       └── ucwork
    │           └── HelloServlet.java
    ├── resources
    │   └── log4j.properties
    └── webapp
        ├── WEB-INF
        │   └── web.xml
        └── index.jsp

7 directories, 4 files

java file

HelloServlet.java

package tech.ucwork;

import java.io.IOException;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.PrintWriter;

public class HelloServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static Logger log = LoggerFactory.getLogger(HelloServlet.class);
	
    public HelloServlet() {
    }
    
    @Override
    public void init() {
    	log.debug("servlet init...");
    }

    @Override
  	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	log.debug("servlet service...");
      PrintWriter out = response.getWriter();
	  	out.println("hello5");
  	}
}

log4j.properties

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %5p %c{1} - %m%n

log4j.rootLogger=debug, stdout

Build & packaging with Maven

Command execution with pom.xml like this!

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>tech.ucwork</groupId>
  <artifactId>myapp</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>myapp Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.6</version>
        <type>jar</type>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.7</version>
        <scope>test</scope>
    </dependency>
    <dependency> 
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.12</version>
    </dependency>
  </dependencies>
  <build>
    <!--Plugin for m compiled with maven-->
    <finalName>${project.artifactId}-${project.version}</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <encoding>UTF-8</encoding>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <!--Plugin for expanding war files from maven to tomcat-->
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
        <configuration>
          <path>/app</path><!--File (directory name) to be expanded under webapps-->
          <server>tomcat-localhost</server>
          <url>http://localhost/manager/text</url>
        </configuration>
      </plugin>
    </plugins>
  </build> 
</project>

zsh

mvn clean package

Deploy to tomcat

Deploy to tomcat with maven

~~ Realized by referring to this site. ~~

~~ I hit a wall, but this stackOverFlow Solved ~~

Deploy war file to tomcat

If you think about it, it was easier than using maven for the following reasons. (I was worried about that ...)

1. I don't know how to throw to all tomcat when deploying manager function via http when multiple tomcat is configured
2. How about being able to deploy via a browser in the first place? Although there are basic authentication products
3. The theory that it could be deployed by attaching a war file under {TOMCAT_HOME} / webapps /

zsh

mvn clean package
docker cp target/myapp-1.0-SNAPSHOT.war tomcat-container:/usr/local/tomcat/webapps/app.war

Reference) Basics of Maven

TODO

Tomcat initial setting related (deletion of existing files & settings such as logs)

I want to set this site as a reference

Load distribution & session management in Apache and Tomcat cluster configuration

I want to set it referring to here

Various setting tuning of Tomcat

Basics of various configuration files Detailed settings Details of thread pool