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<div class="section" id="docker">
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<h1>Docker<a class="headerlink" href="#docker" title="永久链接至标题">¶</a></h1>
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<div class="section" id="dockerjdk">
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<h2>在Docker里使用JDK<a class="headerlink" href="#dockerjdk" title="永久链接至标题">¶</a></h2>
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<p>很多时候，应用在docker里出现arthas无法工作的问题，是因为应用没有安装 JDK ，而是安装了 JRE 。如果只安装了 JRE，则会缺少很多JAVA的命令行工具和类库，Arthas也没办法正常工作。下面介绍两种常见的在Docker里使用JDK的方式。</p>
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<div class="section" id="jdk">
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<h3>使用公开的JDK镜像<a class="headerlink" href="#jdk" title="永久链接至标题">¶</a></h3>
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<ul class="simple">
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<li><p>https://hub.docker.com/_/openjdk/</p></li>
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</ul>
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<p>比如：</p>
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<div class="highlight-default notranslate"><pre class="literal-block">FROM openjdk:8-jdk</pre>
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</div>
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<p>或者：</p>
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<div class="highlight-default notranslate"><pre class="literal-block">FROM openjdk:8-jdk-alpine</pre>
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</div>
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</div>
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<div class="section" id="id1">
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<h3>通过包管理软件来安装<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h3>
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<p>比如：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash"># Install OpenJDK-8
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RUN apt-get update && \
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apt-get install -y openjdk-8-jdk && \
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apt-get install -y ant && \
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apt-get clean;
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# Fix certificate issues
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RUN apt-get update && \
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apt-get install ca-certificates-java && \
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apt-get clean && \
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update-ca-certificates -f;
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# Setup JAVA_HOME -- useful for docker commandline
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ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/
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RUN export JAVA_HOME</pre></div>
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</div>
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<p>或者：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">RUN yum install -y \
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java-1.8.0-openjdk \
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java-1.8.0-openjdk-devel
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ENV JAVA_HOME /usr/lib/jvm/java-1.8.0-openjdk/
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RUN export JAVA_HOME</pre></div>
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</div>
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</div>
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</div>
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<div class="section" id="id2">
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<h2>通过Docker快速入门<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<ol>
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<li><p>删除本地已有的<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code> docker container（非必要）</p>
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<div class="highlight-sh notranslate"><div class="highlight hljs"><pre class="sh">$ docker stop arthas-demo || true && docker rm arthas-demo || true</pre></div>
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</div>
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</li>
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<li><p>启动<code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code></p>
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<div class="highlight-sh notranslate"><div class="highlight hljs"><pre class="sh">$ docker run --name arthas-demo -it hengyunabc/arthas:latest /bin/sh -c "java -jar /opt/arthas/arthas-demo.jar"</pre></div>
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</div>
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</li>
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<li><p>启动<code class="docutils literal notranslate"><span class="pre">arthas-boot</span></code>来进行诊断</p>
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<div class="highlight-sh notranslate"><div class="highlight hljs"><pre class="sh">$ docker exec -it arthas-demo /bin/sh -c "java -jar /opt/arthas/arthas-boot.jar"
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* [1]: 9 jar
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[INFO] arthas home: /opt/arthas
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[INFO] Try to attach process 9
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[INFO] Attach process 9 success.
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[INFO] arthas-client connect 127.0.0.1 3658
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,---. ,------. ,--------.,--. ,--. ,---. ,---.
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/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
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| .-. || '--'.' | | | .--. || .-. |`. `-.
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| | | || |\ \ | | | | | || | | |.-' |
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`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
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wiki: https://arthas.aliyun.com/doc
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version: 3.0.5
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pid: 9
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time: 2018-12-18 11:30:36</pre></div>
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</div>
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</li>
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</ol>
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</div>
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<div class="section" id="dockerjava">
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<h2>诊断Docker里的Java进程<a class="headerlink" href="#dockerjava" title="永久链接至标题">¶</a></h2>
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<div class="highlight-sh notranslate"><div class="highlight hljs"><pre class="sh">docker exec -it ${containerId} /bin/bash -c "wget https://arthas.aliyun.com/arthas-boot.jar && java -jar arthas-boot.jar"</pre></div>
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</div>
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</div>
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<div class="section" id="k8sjava">
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<h2>诊断k8s里容器里的Java进程<a class="headerlink" href="#k8sjava" title="永久链接至标题">¶</a></h2>
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<div class="highlight-sh notranslate"><div class="highlight hljs"><pre class="sh">kubectl exec -it ${pod} --container ${containerId} -- /bin/bash -c "wget https://arthas.aliyun.com/arthas-boot.jar && java -jar arthas-boot.jar"</pre></div>
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</div>
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</div>
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<div class="section" id="arthas">
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<h2>把Arthas安装到基础镜像里<a class="headerlink" href="#arthas" title="永久链接至标题">¶</a></h2>
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<p>可以很简单把Arthas安装到你的Docker镜像里。</p>
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<div class="highlight-default notranslate"><pre class="literal-block">FROM openjdk:8-jdk-alpine
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# copy arthas
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COPY --from=hengyunabc/arthas:latest /opt/arthas /opt/arthas</pre>
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</div>
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<p>如果想指定版本，可以查看具体的tags：</p>
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<p><a class="reference external" href="https://hub.docker.com/r/hengyunabc/arthas/tags">https://hub.docker.com/r/hengyunabc/arthas/tags</a></p>
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</div>
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