docker打包制作镜像# centos7-java17 踩坑_docker 打包openjdk17

1，创建目录并下载jdk上传到服务器中

首先需要jdk17的tar.gz 的包，没有的话，官网下载

从jdk官网下载jdk17镜像，再用xftp上传到服务器中（速度会快点）

jdk官网：Java Downloads | Oracle

创建文件夹

mkdir -p /usr/local/dockerjdk17
cd /usr/local/dockerjdk17
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把下载下来的jdk丢到里面，(重要)

2、创建 Dockerfile 文件

FROM centos:7
MAINTAINER ALuo
WORKDIR /usr/local/java
ADD jdk-17_linux-x64_bin.tar.gz   /usr/local/java/
ENV JAVA_HOME=/usr/local/java/jdk-17.0.10
ENV CLASSPATH=.:$JAVA_HOME/lib/jrt-fs.jar
ENV PATH=$PATH:$JAVA_HOME/bin
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踩坑点：

1，这里的配置文件是对于新创建的docker镜像的，不是本地的地址，我第一遍就是把add 的路径当成了本地上传文件的路径，导致报错。

报错信息：

[root@localhost dockerjdk17]# docker build -t='centos7-java17' .
[+] Building 118.9s (7/7) FINISHED                                                                                                     docker:default
 => [internal] load build definition from Dockerfile                                                                                             0.0s
 => => transferring dockerfile: 255B                                                                                                             0.0s
 => [internal] load metadata for docker.io/library/centos:7                                                                                    118.9s
 => [internal] load .dockerignore                                                                                                                0.0s
 => => transferring context: 2B                                                                                                                  0.0s
 => CANCELED [1/3] FROM docker.io/library/centos:7@sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4                       0.0s
 => => resolve docker.io/library/centos:7@sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4                                0.0s
 => => sha256:eeb6ee3f44bd0b5103bb561b4c16bcb82328cfe5809ab675bb17ab3a16c517c9 2.75kB / 2.75kB                                                   0.0s
 => => sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4 1.20kB / 1.20kB                                                   0.0s
 => => sha256:dead07b4d8ed7e29e98de0f4504d87e8880d4347859d839686a31da35a3b532f 529B / 529B                                                       0.0s
 => [internal] load build context                                                                                                                0.0s
 => => transferring context: 2B                                                                                                                  0.0s
 => CACHED [2/3] WORKDIR /usr/local/jdk                                                                                                          0.0s
 => ERROR [3/3] ADD jdk-17_linux-x64_bin.tar.gz   /usr/local/jdk                                                                                 0.0s
------
 > [3/3] ADD jdk-17_linux-x64_bin.tar.gz   /usr/local/jdk:
------
Dockerfile:4
--------------------
   2 |     MAINTAINER ALuo
   3 |     WORKDIR /usr/local/jdk
   4 | >>> ADD jdk-17_linux-x64_bin.tar.gz   /usr/local/jdk
   5 |     ENV JAVA_HOME=/usr/local/jdk/jdk-17.0.2
   6 |     ENV CLASSPATH=.:$JAVA_HOME/lib/jrt-fs.jar
--------------------
ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref 740c625f-cd54-44ab-8969-c9101a1b35d8::td9lhc77z0mx8g4lqgc12jvvf: "/jdk-17_linux-x64_bin.tar.gz": not found
[root@localhost dockerjdk17]# ls
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2，ENV JAVA_HOME=/usr/local/java/jdk-17.0.10 中的jdk-17.0.10不要替换成jdk-17_linux-x64_bin.tar.gz ，因为ADD jdk17.tar.gz命令中ADD自带解压缩的功能，而jdk-17_linux-x64_bin.tar.gz 解压缩后并不是直接去掉压缩后缀，所以最好先解压一遍看下解压之后的文件夹名是什么，再替换文件目录名

3，复制的时候注意一下，这里复制过去的FROM 莫名其妙的就成了 M 了，导致报错。

报错信息：

[root@localhost dockerjdk17]# docker build -t='centos7-java17' .
[+] Building 0.0s (1/1) FINISHED                                                                                                       docker:default
 => [internal] load build definition from Dockerfile                                                                                             0.0s
 => => transferring dockerfile: 252B                                                                                                             0.0s
Dockerfile:1
--------------------
   1 | >>> M centos:7
   2 |     MAINTAINER ALuo
   3 |     WORKDIR /usr/local/jdk
--------------------
ERROR: failed to solve: dockerfile parse error on line 1: unknown instruction: M (did you mean CMD?)
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3、构建镜像(注意后面有点，表示当前目录)

docker build -t='centos7-java17' .
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出现下面信息，表示镜像打包成功

[root@localhost dockerjdk17]# docker build -t='centos7-java17' .
[+] Building 136.3s (8/8) FINISHED                                                                                                     docker:default
 => [internal] load build definition from Dockerfile                                                                                             0.0s
 => => transferring dockerfile: 255B                                                                                                             0.0s
 => [internal] load metadata for docker.io/library/centos:7                                                                                     22.5s
 => [internal] load .dockerignore                                                                                                                0.0s
 => => transferring context: 2B                                                                                                                  0.0s
 => [1/3] FROM docker.io/library/centos:7@sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4                              108.5s
 => => resolve docker.io/library/centos:7@sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4                                0.0s
 => => sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4 1.20kB / 1.20kB                                                   0.0s
 => => sha256:dead07b4d8ed7e29e98de0f4504d87e8880d4347859d839686a31da35a3b532f 529B / 529B                                                       0.0s
 => => sha256:eeb6ee3f44bd0b5103bb561b4c16bcb82328cfe5809ab675bb17ab3a16c517c9 2.75kB / 2.75kB                                                   0.0s
 => => sha256:2d473b07cdd5f0912cd6f1a703352c82b512407db6b05b43f2553732b55df3bc 76.10MB / 76.10MB                                               103.4s
 => => extracting sha256:2d473b07cdd5f0912cd6f1a703352c82b512407db6b05b43f2553732b55df3bc                                                        4.8s
 => [internal] load build context                                                                                                                1.4s
 => => transferring context: 181.12MB                                                                                                            1.4s
 => [2/3] WORKDIR /usr/local/jdk                                                                                                                 0.8s
 => [3/3] ADD jdk-17_linux-x64_bin.tar.gz   /usr/local/jdk                                                                                       3.1s
 => exporting to image                                                                                                                           1.4s
 => => exporting layers                                                                                                                          1.1s
 => => writing image sha256:da3c317efca440c8130e6781f61b7c51b1413e64f0fd238f2b5fbd5232c92138                                                     0.3s
 => => naming to docker.io/library/centos7-java17
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4、启动镜像

docker run -di --name centos7-java17 -d centos7-java17
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5、进入容器

查询jdk17的容器信息

docker images
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找到jdk17容器信息

REPOSITORY       TAG       IMAGE ID       CREATED          SIZE
centos7-java17   latest    da3c317efca4   10 minutes ago   520MB
hello-world      latest    d2c94e258dcb   11 months ago    13.3kB
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进入容器

docker exec -it centos7-java17 /bin/bash
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6、查看版本

java -version
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显示jdk信息

[root@6e71890c0c6e jdk]# java -version
java version "17.0.2" 2022-01-18 LTS
Java(TM) SE Runtime Environment (build 17.0.2+8-LTS-86)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.2+8-LTS-86, mixed mode, sharing)
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退出容器 输入 exit 即可

[root@6e71890c0c6e jdk]# exit
exit
[root@localhost dockerjdk17]#
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