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# Docker
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## 在 Docker 里使用 JDK
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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。
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### 使用公开的 JDK 镜像
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- https://hub.docker.com/_/openjdk/
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比如：
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```
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FROM openjdk:8-jdk
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```
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或者：
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```
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FROM openjdk:8-jdk-alpine
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```
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### 通过包管理软件来安装
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比如：
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```bash
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# 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
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```
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或者：
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```bash
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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
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```
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## 通过 Docker 快速入门
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1. 删除本地已有的`math-game` docker container（非必要）
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```sh
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$ docker stop math-game || true && docker rm math-game || true
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```
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1. 启动`math-game`
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```sh
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$ docker run --name math-game -it hengyunabc/arthas:latest /bin/sh -c "java -jar /opt/arthas/math-game.jar"
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```
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1. 启动`arthas-boot`来进行诊断
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```sh
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$ docker exec -it math-game /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
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```
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## 诊断 Docker 里的 Java 进程
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```sh
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docker exec -it ${containerId} /bin/bash -c "wget https://arthas.aliyun.com/arthas-boot.jar && java -jar arthas-boot.jar"
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```
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## 诊断 k8s 里容器里的 Java 进程
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```sh
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kubectl exec -it ${pod} --container ${containerId} -- /bin/bash -c "wget https://arthas.aliyun.com/arthas-boot.jar && java -jar arthas-boot.jar"
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```
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## 把 Arthas 安装到基础镜像里
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可以很简单把 Arthas 安装到你的 Docker 镜像里。
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```
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FROM openjdk:8-jdk-alpine
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# copy arthas
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COPY --from=hengyunabc/arthas:latest /opt/arthas /opt/arthas
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```
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如果想指定版本，可以查看具体的 tags：
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[https://hub.docker.com/r/hengyunabc/arthas/tags](https://hub.docker.com/r/hengyunabc/arthas/tags)
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