# 使用Docker运行JAVA应用

## 安装JDK

```shell

yum -y install java

[root@dockerserver ~]# java -version

openjdk version "1.8.0_222"

OpenJDK Runtime Environment (build 1.8.0_222-b10)

OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)

```

## 安装maven

```shell

wget

tar zxf apache-maven-3.6.1-bin.tar.gz -C /usr/local/

echo "export M2_HOME=/usr/local/apache-maven-3.6.1" >> /etc/profile

echo "export PATH=\$PATH:\$M2_HOME/bin" >> /etc/profile

source /etc/profile

mvn -version

Apache Maven 3.6.1 (d66c9c0b3152b2e69ee9bac180bb8fcc8e6af555; 2019-04-04T15:00:29-04:00)

Maven home: /usr/local/apache-maven-3.6.1

Java version: 1.8.0_222, vendor: Oracle Corporation, runtime: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64/jre

Default locale: zh_CN, platform encoding: UTF-8

OS name: "linux", version: "3.10.0-514.el7.x86_64", arch: "amd64", family: "unix"

```

## 创建一个Springboot项目

项目地址：

```shell

yum -y install git wget

git clone

cd springboot-helloworld

mvn clean install -DskipTests

ls target/

systemctl stop firewalld

java -jar helloworld-0.0.1-SNAPSHOT.jar #启动服务

nohup java -jar helloworld-0.0.1-SNAPSHOT.jar &

```

## 安装Docker

```shell

yum -y install docker

vim /etc/sysconfig/docker

OPTIONS='--selinux-enabled=false --log-driver=journald --signature-verification=false'

systemctl start docker

systemctl status docker

systemctl enable docker

yum -y update

reboot

```

## 创建Dockerfile

```

FROM openjdk:8

MAINTAINER zy

COPY ./helloworld-0.0.1-SNAPSHOT.jar helloworld-0.0.1-SNAPSHOT.jar

EXPOSE 8080

CMD ["java","-jar","helloworld-0.0.1-SNAPSHOT.jar"]

```

## 构建容器镜像

```shell

docker build -t mytest/docker/springbootdemo:latest .

[root@dockerserver ~]# docker build -t mytest/docker/springbootdemo:latest .

Sending build context to Docker daemon 35.98 MB

Step 1/5 : FROM openjdk:8

Trying to pull repository docker.io/library/openjdk ...

8: Pulling from docker.io/library/openjdk

9cc2ad81d40d: Pull complete

e6cb98e32a52: Pull complete

ae1b8d879bad: Pull complete

42cfa3699b05: Pull complete

8d27062ef0ea: Pull complete

9b91647396e3: Pull complete

7498c1055ea3: Pull complete

Digest: sha256:0a16427b68dfaea1ba1d6e462de940580d72549a694dd6cab82ce16ef9edfe66

Status: Downloaded newer image for docker.io/openjdk:8

---> 08ded5f856cc

Step 2/5 : MAINTAINER demo

---> Running in 546d342383a5

---> 90eea0bb5aaf

Removing intermediate container 546d342383a5

Step 3/5 : COPY ./helloworld-0.0.1-SNAPSHOT.jar helloworld-0.0.1-SNAPSHOT.jar

---> dcefbeb1107f

Removing intermediate container 51d150a3a8b5

Step 4/5 : EXPOSE 8080

---> Running in 5a1c6103b615

---> c5c27261fb9d

Removing intermediate container 5a1c6103b615

Step 5/5 : CMD java -jar helloworld-0.0.1-SNAPSHOT.jar

---> Running in d0df0ced4030

---> 8189ee4c7f86

Removing intermediate container d0df0ced4030

Successfully built 8189ee4c7f86

#查看镜像

[root@dockerserver ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

mytest/docker/springbootdemo latest 8189ee4c7f86 34 seconds ago 501 MB

docker.io/openjdk 8 08ded5f856cc 2 weeks ago 488 MB

#删除镜像

docker rmi 8189ee4c7f86

Untagged: mytest/docker/springbootdemo:latest

Deleted: sha256:8189ee4c7f86766100db7a1df412c797d460eb18861913f352befdbbc25df859

Deleted: sha256:c5c27261fb9ded086e6be8e6782079459f38301e62203336ad0b18f982e74484

Deleted: sha256:dcefbeb1107f20b706668a36931237e1540de5eb3aca7067cf69751a31569e8e

Deleted: sha256:217140c9719bd7120916fc97a5e171d33a64458ab8bfe106accc793f51562a16

Deleted: sha256:90eea0bb5aafdc2462e925dd0a8f9615f03cf6c2898c48b04ff4dad93a80c4ac

```

## 运行容器镜像

```shell

docker run -itd -p 8080:8080 mytest/docker/springbootdemo:latest

docker run -itd mytest/docker/springbootdemo:latest

8c2b9a3b545c021a3f8d06d96e36d55f607e75afdfcffa251e68ed3975c70553

docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8c2b9a3b545c mytest/docker/springbootdemo:latest "java -jar hellowo..." 7 seconds ago Up 6 seconds 8080/tcp wizardly_brattain

docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8c2b9a3b545c mytest/docker/springbootdemo:latest "java -jar hellowo..." 17 seconds ago Up 16 seconds 8080/tcp wizardly_brattain

#链接容器

docker exec -it 8c2b9a3b545c /bin/bash

root@8c2b9a3b545c:/# ps

PID TTY TIME CMD

23 ? 00:00:00 bash

28 ? 00:00:00 ps

root@8c2b9a3b545c:/# ps axu

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND

root 1 19.8 3.8 2943196 149588 ? Ssl+ 03:10 0:16 java -jar helloworld-0.0.1-SNAPSHOT.jar

root 23 0.5 0.0 19936 2220 ? Ss 03:11 0:00 /bin/bash

root 29 0.0 0.0 38372 1644 ? R+ 03:11 0:00 ps axu

root@8c2b9a3b545c:/# curl 127.0.0.1:8080

Hello from GazGeek!root@8c2b9a3b545c:/#

```

## 停止和删除容器

```

docker stop

docker rm

[root@dockerserver ~]# docker rm $(docker ps -a -q)

e976498656af

2330b6a8875e

7ace91b113ae

f1adee2c6f37

d5c37fb8ecf6

ebaf4fc4c263

cd2b979d25aa

3d5b0616634e

Error response from daemon: You cannot remove a running container 8c2b9a3b545c021a3f8d06d96e36d55f607e75afdfcffa251e68ed3975c70553. Stop the container before attempting removal or use -f

[root@dockerserver ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8c2b9a3b545c mytest/docker/springbootdemo:latest "java -jar hellowo..." 5 minutes ago Up 5 minutes 8080/tcp wizardly_brattain

[root@dockerserver ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8c2b9a3b545c mytest/docker/springbootdemo:latest "java -jar hellowo..." 5 minutes ago Up 5 minutes 8080/tcp wizardly_brattain

[root@dockerserver ~]# docker rm $(docker ps -a -q)

[root@dockerserver ~]# docker rm $(docker ps -a -q) -f

8c2b9a3b545c