# 《容器化核心技术》第01章：制作Java基础docker镜像
大家好，我是CurleyG~~
今天，给大家分享的是《容器化核心技术》的第01章，如何制作Java基础Docker镜像，好了，开始今天的正题。
# 选择底层操作系统
通常是从一个底层的操作系统来开始构建一个Docker镜像的，也就是Dockerfile的FROM指令提及的。在某些情况下，你也许会从一个已有的基础镜像开始，这时你已经选择了底层操作系统镜像。但是如果你需要选择一个底层操作系统镜像，那么常用的镜像和对应的大小如下所示：
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu 19.04 9b17fc7d6848 5 days ago 75.4MB
alpine 3.9 055936d39205 10 days ago 5.53MB
busybox latest 64f5d945efcc 11 days ago 1.2MB
centos 7.6.1810 f1cb7c7d58b7 2 months ago 202MB
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# 制作基础系统镜像
制作基础系统镜像alpine、centos、ubuntu
注意：所有基础镜像及部署软件都要指定好具体版本，禁用last tag
- 下载alpine基础镜像
[root@VM_8_24_centos ~]# docker pull alpine:v3.9
Error response from daemon: manifest for alpine:v3.9 not found
[root@VM_8_24_centos ~]# docker pull alpine:3.9
3.9: Pulling from library/alpine
Digest: sha256:769fddc7cc2f0a1c35abb2f91432e8beecf83916c421420e6a6da9f8975464b6
Status: Downloaded newer image for alpine:3.9
[root@VM_8_24_centos ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
alpine 3.9 055936d39205 10 days ago 5.53MB
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- 登录私有镜像库
[root@VM_8_24_centos ~]# docker login core-harbor.minminmsn.com
Username: admin
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
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- 打标签上传到私有镜像库
[root@VM_8_24_centos ~]# docker tag library/alpine:3.9 core-harbor.minminmsn.com/public/alpine:3.9
[root@VM_8_24_centos ~]# docker push core-harbor.minminmsn.com/public/alpine:3.9
The push refers to repository [core-harbor.minminmsn.com/public/alpine]
f1b5933fe4b5: Pushed
3.9: digest: sha256:bf1684a6e3676389ec861c602e97f27b03f14178e5bc3f70dce198f9f160cce9 size: 528
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- 同样方法制作centos、ubuntu系统基础镜像
[root@VM_8_24_centos ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
core-harbor.minminmsn.com/public/ubuntu 19.04 9b17fc7d6848 5 days ago 75.4MB
ubuntu 19.04 9b17fc7d6848 5 days ago 75.4MB
core-harbor.minminmsn.com/public/alpine 3.9 055936d39205 10 days ago 5.53MB
alpine 3.9 055936d39205 10 days ago 5.53MB
core-harbor.minminmsn.com/public/centos 7.6.1810 f1cb7c7d58b7 2 months ago 202MB
centos 7.6.1810 f1cb7c7d58b7 2 months ago 202MB
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# 制作jre镜像
在centos基础镜像上制作jre镜像
- 下载jre包
[work@VM_8_24_centos jre-centos]# wget https://github.com/frekele/oracle-java/releases/download/8u212-b10/jre-8u212-linux-x64.tar.gz
[work@VM_8_24_centos jre-centos]# ls
jre-8u212-linux-x64.tar.gz
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- 编辑Dockerfile
[work@VM_8_24_centos jre-centos]# cat Dockerfile
# 基础镜像
FROM core-harbor.minminmsn.com/public/centos:7.6.1810
# 维护信息
MAINTAINER minyt <minyongtao@minminmsn.com>
# 文件复制到镜像
ADD jre-8u212-linux-x64.tar.gz /usr/local/
# 设置环境变量
ENV JAVA_HOME /usr/local/jre1.8.0_212
ENV PATH ${PATH}:${JAVA_HOME}/bin
# 容器启动时运行的命令
CMD ["java", "-version"]
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- 制作镜像
[root@VM_8_24_centos data]# cd jre-centos/
[root@VM_8_24_centos jre-centos]# ls
Dockerfile jre-8u212-linux-x64.tar.gz
[root@VM_8_24_centos jre-centos]# docker build -t core-harbor.minminmsn.com/public/jre-centos:1.8.0_212 .
Sending build context to Docker daemon 87.89MB
Step 1/6 : FROM core-harbor.minminmsn.com/public/centos:7.6.1810
---> f1cb7c7d58b7
Step 2/6 : MAINTAINER minyt <minyongtao@minminmsn.com>
---> Using cache
---> d0fb7c193008
Step 3/6 : ADD jre-8u212-linux-x64.tar.gz /usr/local/
---> 674cf9135825
Step 4/6 : ENV JAVA_HOME /usr/local/jre1.8.0_212
---> Running in 1c4a7c7a19ad
Removing intermediate container 1c4a7c7a19ad
---> ab2fc886e944
Step 5/6 : ENV PATH ${PATH}:${JAVA_HOME}/bin
---> Running in 3107ba5ae7b9
Removing intermediate container 3107ba5ae7b9
---> f14d2948c92d
Step 6/6 : CMD ["java", "-version"]
---> Running in 99374bccaa27
Removing intermediate container 99374bccaa27
---> f27d47159f1e
Successfully built f27d47159f1e
Successfully tagged core-harbor.minminmsn.com/public/jre-centos:1.8.0_212
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- 查看镜像
[root@VM_8_24_centos jre-centos]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
core-harbor.minminmsn.com/public/jre-centos 1.8.0_212 f27d47159f1e 17 seconds ago 441MB
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- 上传镜像到私有镜像库
[root@VM_8_24_centos jre-centos]# docker push core-harbor.minminmsn.com/public/jre-centos:1.8.0_212
The push refers to repository [core-harbor.minminmsn.com/public/jre-centos]
b9049811dc7d: Pushed
89169d87dbe2: Mounted from public/jdk-centos
1.8.0_212: digest: sha256:5c909a0c33aaa13b3a3ce48fd0f60356a32c5a697d99f39f08e92f1c6ba7bd57 size: 741
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- 运行验证jre镜像
[root@VM_8_24_centos jre-centos]# docker run core-harbor.minminmsn.com/public/jre-centos:1.8.0_212
java version "1.8.0_212"
Java(TM) SE Runtime Environment (build 1.8.0_212-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.212-b10, mixed mode)
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好了，今天就到这儿吧，我是冰河，我们下期见~~
转自：blog.51cto.com/jerrymin/2399018
