1. 创建dockerfile存放目录

1.1 创建目录

[root@docker ~]# mkdir -p /dockerfile
[root@docker ~]# cd /dockerfile/
[root@docker dockerfile]# mkdir -p java
[root@docker dockerfile]# cd java/

2. 创建tomcat dockerfile配置文件

2.1 创建文件

[root@docker nginx]# touch Dockerfile

2.2 下载地址

github地址：https://github.com/tiaotiaodan/dockerfile-java-demo.git

2.3 下载jar的demo包

[root@docker java]# cd /tmp/
[root@docker tmp]# ll
总用量 0
drwxr-xr-x. 2 root root  6 10月 15 19:34 hsperfdata_root
drwx------. 3 root root 17 9月  27 21:45 systemd-private-0b1f5a81877943188701d6297bbc0965-chronyd.service-6L6jNz
[root@docker tmp]# git clone https://github.com/tiaotiaodan/dockerfile-java-demo.git
正克隆到 'dockerfile-java-demo'...
remote: Enumerating objects: 3, done.
remote: Counting objects: 100% (3/3), done.
remote: Compressing objects: 100% (2/2), done.
remote: Total 3 (delta 0), reused 3 (delta 0), pack-reused 0
Unpacking objects: 100% (3/3), done.
[root@docker tmp]# ll
总用量 0
drwxr-xr-x. 3 root root 35 10月 15 19:48 dockerfile-java-demo
drwxr-xr-x. 2 root root  6 10月 15 19:34 hsperfdata_root
drwx------. 3 root root 17 9月  27 21:45 systemd-private-0b1f5a81877943188701d6297bbc0965-chronyd.service-6L6jNz
[root@docker tmp]# cd dockerfile-java-demo/
[root@docker dockerfile-java-demo]# ll
总用量 4
-rw-r--r--. 1 root root 960 10月 15 19:48 hello.jar
[root@docker dockerfile-java-demo]# mv hello.jar  /dockerfile/java/

3. 编写dockerfile文件

[root@docker java]# vim Dockerfile 
[root@docker java]# cat Dockerfile 
# this docker file
# VERSION 1.0
# author: shichao
# email: shichao@scajy.cn


FROM java:8-jdk-alpine
MAINTAINER  shichao@scajy.cn

ENV JAVA_OPTS="$JAVA_OPTS -Dfile.encoding=UTF8 -Duser.timezone=GMT+08"
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories && \
    apk add -U tzdata && \
    ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

COPY hello.jar /

EXPOSE 8888

CMD ["/bin/sh", "-c", "java -jar  $JAVA_OPTS /hello.jar "]

4. 构建微服务jar

[root@docker java]# docker build -t jar:v1 .
Sending build context to Docker daemon  3.584kB
Step 1/7 : FROM java:8-jdk-alpine
8-jdk-alpine: Pulling from library/java
709515475419: Pull complete 
38a1c0aaa6fd: Pull complete 
5b58c996e33e: Pull complete 
Digest: sha256:d49bf8c44670834d3dade17f8b84d709e7db47f1887f671a0e098bafa9bae49f
Status: Downloaded newer image for java:8-jdk-alpine
 ---> 3fd9dd82815c
Step 2/7 : MAINTAINER  shichao@scajy.cn
 ---> Running in f50249514436
Removing intermediate container f50249514436
 ---> d6f56767edae
Step 3/7 : ENV JAVA_OPTS="$JAVA_OPTS -Dfile.encoding=UTF8 -Duser.timezone=GMT+08"
 ---> Running in 0e20cedd3b70
Removing intermediate container 0e20cedd3b70
 ---> d3e36a34f548
Step 4/7 : RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories &&     apk add -U tzdata &&     ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
 ---> Running in 96f2c4a4bcac
fetch http://mirrors.aliyun.com/alpine/v3.4/main/x86_64/APKINDEX.tar.gz
fetch http://mirrors.aliyun.com/alpine/v3.4/community/x86_64/APKINDEX.tar.gz
(1/1) Installing tzdata (2016d-r0)
Executing busybox-1.24.2-r13.trigger
OK: 144 MiB in 36 packages
Removing intermediate container 96f2c4a4bcac
 ---> f8be322019f2
Step 5/7 : COPY hello.jar /
 ---> 7fab81b93d23
Step 6/7 : EXPOSE 8888
 ---> Running in 085b0beb6af9
Removing intermediate container 085b0beb6af9
 ---> 99143195fbde
Step 7/7 : CMD ["/bin/bash", "-c", "java -jar  $JAVA_OPTS /hello.jar "]
 ---> Running in da7c8b3606ce
Removing intermediate container da7c8b3606ce
 ---> 866c952a3175
Successfully built 866c952a3175
Successfully tagged jar:v1

5. 查看镜像，验证构建成功没

[root@docker java]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
jar                 v1                  866c952a3175        10 minutes ago      147MB

6. 使用jar镜像，创建docker容器

[root@docker java]# docker run -d --name=jar --network=test -p8888:8888 jar:v1
d4ee5d1bc159c517a48ccd90c0fd6dcfa6cb6cad4c5852ad182a9e62c032e6d8

7. 验证jar容器是否正常运行

[root@docker java]# docker ps -a 
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                              NAMES
d4ee5d1bc159        jar:v1              "/bin/sh -c 'java -j…"   About a minute ago   Up About a minute   0.0.0.0:8888->8888/tcp             jar
84a078c18812        tomcat:v1           "catalina.sh run"        2 hours ago          Up 2 hours          0.0.0.0:8080->8080/tcp, 9000/tcp   tomcat

8. 浏览器访问

8.1 查看本机IP

[root@docker java]# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.200.126  netmask 255.255.255.0  broadcast 192.168.200.255
        inet6 fe80::250:56ff:feb6:c59f  prefixlen 64  scopeid 0x20<link>
        inet6 fd37:1f22:7906:0:250:56ff:feb6:c59f  prefixlen 64  scopeid 0x0<global>
        ether 00:50:56:b6:c5:9f  txqueuelen 1000  (Ethernet)
        RX packets 130188002  bytes 11612360985 (10.8 GiB)
        RX errors 0  dropped 368300  overruns 0  frame 0
        TX packets 550582  bytes 50513244 (48.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

8.2 docker log 查看后台输出内容

[root@docker ~]# docker logs jar 
Hello world!
sleep 1 day...