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25-二十五、Docker 安装 Tomcat

Tomcat 是 Java Web 最流行的容器之一,Docker 安装 Tomcat 有两种方法

我们以当前最新的版本 9.0.8 安装为例

因为 Tomcat 需要 Java 环境,我们使用的是 jre8

1. docker pull tomcat

这种方法非常适合只需要使用 Tomcat 的开发者

1、 查找 Docker Hub 上的 tomcat 镜像


[root@localhost ~]# docker search tomcat NAME DESCRIPTION OFFICIAL tomcat Apache Tomcat is an open source ... [OK] ...

有很多版本,我们选择官方的 tomcat
2、 拉取官方的镜像,标签为 9.0.8-jre8


[root@localhost ~]# docker pull tomcat:9.0.8-jre8 9.0.8-jre8: Pulling from library/tomcat

3、 稍等片刻,就能在本地镜像列表里看到 tomcat


[root@localhost ~]# docker images tomcat REPOSITORY TAG IMAGE ID CREATED SIZE tomcat 9.0.8-jre8 fffeb191ae8c 2 weeks ago 465.6 MB

一个 Tomcat 容器 400m ….
4、 通过 Dockerfile 构建

可以使用 Dockerfile 定制自己的 Tomcat 容器

1、 创建目录 tomcat ,用于存放后面的相关东西


[root@localhost ~]# mkdir -p ~/tomcat/webapps ~/tomcat/logs ~/tomcat/conf
目录 说明
webapps 将映射为tomcat容器配置的应用程序目录
logs 将映射为tomcat容器的日志目录
conf 该目录下的配置文件将映射为tomcat容器的配置文件

2、 进入 tomcat目录,创建 Dockerfile


[root@localhost ~]# cd tomcat [root@localhost tomcat]# vi Dockerfile

复制并粘贴以下内容:


FROM openjdk:8-jre ENV CATALINA_HOME /usr/local/tomcat ENV PATH $CATALINA_HOME/bin:$PATH RUN mkdir -p "$CATALINA_HOME" WORKDIR $CATALINA_HOME # let "Tomcat Native" live somewhere isolated ENV TOMCAT_NATIVE_LIBDIR $CATALINA_HOME/native-jni-lib ENV LD_LIBRARY_PATH ${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$TOMCAT_NATIVE_LIBDIR # runtime dependencies for Tomcat Native Libraries # Tomcat Native 1.2+ requires a newer version of OpenSSL than debian:jessie has available # > checking OpenSSL library version >= 1.0.2... # > configure: error: Your version of OpenSSL is not compatible with this version of tcnative # see http://tomcat.10.x6.nabble.com/VOTE-Release-Apache-Tomcat-8-0-32-tp5046007p5046024.html (and following discussion) # and https://github.com/docker-library/tomcat/pull/31 ENV OPENSSL_VERSION 1.1.0f-3+deb9u2 RUN set -ex; \ currentVersion="$(dpkg-query --show --showformat '${Version}\n' openssl)"; \ if dpkg --compare-versions "$currentVersion" '<<' "$OPENSSL_VERSION"; then \ if ! grep -q stretch /etc/apt/sources.list; then \ # only add stretch if we're not already building from within stretch { \ echo 'deb http://deb.debian.org/debian stretch main'; \ echo 'deb http://security.debian.org stretch/updates main'; \ echo 'deb http://deb.debian.org/debian stretch-updates main'; \ } > /etc/apt/sources.list.d/stretch.list; \ { \ # add a negative "Pin-Priority" so that we never ever get packages from stretch unless we explicitly request them echo 'Package: *'; \ echo 'Pin: release n=stretch*'; \ echo 'Pin-Priority: -10'; \ echo; \ # ... except OpenSSL, which is the reason we're here echo 'Package: openssl libssl*'; \ echo "Pin: version $OPENSSL_VERSION"; \ echo 'Pin-Priority: 990'; \ } > /etc/apt/preferences.d/stretch-openssl; \ fi; \ apt-get update; \ apt-get install -y --no-install-recommends openssl="$OPENSSL_VERSION"; \ rm -rf /var/lib/apt/lists/*; \ fi RUN apt-get update && apt-get install -y --no-install-recommends \ libapr1 \ && rm -rf /var/lib/apt/lists/* ENV TOMCAT_MAJOR 9 ENV TOMCAT_VERSION 9.0.8 ENV TOMCAT_TGZ_URLS \ # https://issues.apache.org/jira/browse/INFRA-8753?focusedCommentId=14735394#comment-14735394 https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz \ # if the version is outdated, we might have to pull from the dist/archive :/ https://www-us.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz \ https://www.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz \ https://archive.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz ENV TOMCAT_ASC_URLS \ https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz.asc \ # not all the mirrors actually carry the .asc files :'( https://www-us.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz.asc \ https://www.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz.asc \ https://archive.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz.asc RUN set -eux; \ \ savedAptMark="$(apt-mark showmanual)"; \ apt-get update; \ \ apt-get install -y --no-install-recommends gnupg dirmngr; \ \ apt-get install -y --no-install-recommends wget ca-certificates; \ \ success=; \ for url in $TOMCAT_TGZ_URLS; do \ if wget -O tomcat.tar.gz "$url"; then \ success=1; \ break; \ fi; \ done; \ [ -n "$success" ]; \ \ tar -xvf tomcat.tar.gz --strip-components=1; \ rm bin/*.bat; \ rm tomcat.tar.gz*; \ \ nativeBuildDir="$(mktemp -d)"; \ tar -xvf bin/tomcat-native.tar.gz -C "$nativeBuildDir" --strip-components=1; \ apt-get install -y --no-install-recommends \ dpkg-dev \ gcc \ libapr1-dev \ libssl-dev \ make \ "openjdk-${JAVA_VERSION%%[.~bu-]*}-jdk=$JAVA_DEBIAN_VERSION" \ ; \ ( \ export CATALINA_HOME="$PWD"; \ cd "$nativeBuildDir/native"; \ gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \ ./configure \ --build="$gnuArch" \ --libdir="$TOMCAT_NATIVE_LIBDIR" \ --prefix="$CATALINA_HOME" \ --with-apr="$(which apr-1-config)" \ --with-java-home="$(docker-java-home)" \ --with-ssl=yes; \ make -j "$(nproc)"; \ make install; \ ); \ rm -rf "$nativeBuildDir"; \ rm bin/tomcat-native.tar.gz; \ \ # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies apt-mark auto '.*' > /dev/null; \ [ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \ apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \ rm -rf /var/lib/apt/lists/*; \ \ # sh removes env vars it doesn't support (ones with periods) # https://github.com/docker-library/tomcat/issues/77 find ./bin/ -name '*.sh' -exec sed -ri 's|^#!/bin/sh$|#!/usr/bin/env bash|' '{}' + # verify Tomcat Native is working properly RUN set -e \ && nativeLines="$(catalina.sh configtest 2>&1)" \ && nativeLines="$(echo "$nativeLines" | grep 'Apache Tomcat Native')" \ && nativeLines="$(echo "$nativeLines" | sort -u)" \ && if ! echo "$nativeLines" | grep 'INFO: Loaded APR based Apache Tomcat Native library' >&2; then \ echo >&2 "$nativeLines"; \ exit 1; \ fi EXPOSE 8080 CMD ["catalina.sh", "run"]

3、 使用 docker build 命令通过 Dockerfile 创建一个镜像 my-tomcat:9.0.8-jre8


[root@localhost tomcat]# docker build -t my-tomcat:9.0.8-jre8 . Sending build context to Docker daemon 10.75 kB ...

4、 稍等片刻,创建完成后就可以在本地的镜像列表里查找到刚刚创建的镜像


[root@localhost tomcat]# docker images my-tomcat REPOSITORY TAG IMAGE ID CREATED SIZE my-tomcat 9.0.8-jre8 d0ff57656e50 11 days ago 463.8 MB

运行 tomcat 容器

首先创建 tomcat/webapps/demo 目录并在 demo 目录下放一个 index.html 文件,内容如下


<!DOCTYPE html> <meta charset="utf-8"> <h2>Hello www.ycbbs.vip</h2> <p>研发军团,教程 </p>

然后使用 docker run 运行 my-tomcat 容器


[root@localhost tomcat]# docker run -d --name tomcat -p 8080:8080 -v $PWD/webapps/demo:/usr/local/tomcat/webapps/demo tomcat:9.0.8-jre8 e139c23bf7bc3a4926db947e63fa0c07b771fc9b400645668945c07cb8dfd05a

命令说明

1、 -p 8080:8080

将容器的 8080 端口映射到主机的 8080 端口
2、 -v $PWD/webapps/demo:/usr/local/tomcat/webapps/demo

将主机中当前目录下的 webapps/demo 挂载到容器的 /usr/local/tomcat/webapps/demo

查看容器启动情况

可以使用 docker ps -a 查看 tomcat 容器的运行状况


[root@localhost tomcat]# docker ps -a CONTAINER ID IMAGE STATUS e139c23bf7bc tomcat:9.0.8-jre8 Up About a minute

通过浏览器访问 http://localhost:8080/demo/

输出如下

img_1.png

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标题:25-二十五、Docker 安装 Tomcat

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