学习笔记:微服务-20 docker中运行spring boot

docker 中部署spring cloud项目是比较流行的搭配，以下是配置过程记录

1. 先把spring boot项目打包

我这以我前面建立的microservice-eureka-server-8101项目为例

cd /home/linbin/workspace/microservice-eureka-server-8101

mvn install

注意打包的项目pom.xml有如下的内容才能自动生成打包清单

   <build>
       <plugins>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
           </plugin>
       </plugins>
   </build>

打包完成后会在目录下多了个target目录，里面有了打包后jar文件 microservice-eureka-server-8101-0.0.1-SNAPSHOT.jar

2. 在该目录下新建Dockerfile文件

[root@centos7 microservice-eureka-server-8101]# cat Dockerfile
FROM openjdk:8-jdk-alpine
VOLUME /tmp
ADD microservice-eureka-server-8101-0.0.1-SNAPSHOT.jar app.jar
EXPOSE 8101
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

3. 创建影像 docker build -t springclouddemo/eureka:eureka8101 . #注意最后的. 点，表示当前目录

# docker build -t springclouddemo/eureka:eureka8101 .
Sending build context to Docker daemon 46.36 MB
Step 1/5 : FROM openjdk:8-jdk-alpine
Trying to pull repository docker.io/library/openjdk ... 
8-jdk-alpine: Pulling from docker.io/library/openjdk
cd784148e348: Pull complete 
35920a071f91: Pull complete 
88b05767cad1: Downloading [================================>                  ] 88b05767cad1: Downloading 47.73 MB/70.65 MB88b05767cad1: Pull complete 
Digest: sha256:4745e7b0cc551f68592f75a524f4479e878cb726ffc851dfad3e2c9280828b01
Status: Downloaded newer image for docker.io/openjdk:8-jdk-alpine
 ---> 2cfb1dc1f0c8
Step 2/5 : VOLUME /tmp
 ---> Running in 423589dc8991
 ---> caaa1fbb0bef
Removing intermediate container 423589dc8991
Step 3/5 : ADD microservice-eureka-server-8101-0.0.1-SNAPSHOT.jar app.jar
 ---> abe41148d340
Removing intermediate container 43fb43e3c94e
Step 4/5 : EXPOSE 8101
 ---> Running in 7c66ccf5021c
 ---> 6d5e9baf8e38
Removing intermediate container 7c66ccf5021c
Step 5/5 : ENTRYPOINT java -Djava.security.egd=file:/dev/./urandom -jar /app.jar
 ---> Running in 83a072492725
 ---> 285be3969707
Removing intermediate container 83a072492725
Successfully built 285be3969707

因为 openjdk:8-jdk-alpine影像本地没有，会先自动下载。

根据下载的影像再加入指定的jar，生成新的影像

4. 运行

docker run -d -p 8101:8101 springclouddemo/eureka:eureka8101

把宿主机的8101端口映射到docker实例的8101端口

5.测试正常服务

6.查看镜像和实例

[root@centos7 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
springclouddemo/eureka eureka8101 285be3969707 30 minutes ago 149 MB
docker.io/openjdk 8-jdk-alpine 2cfb1dc1f0c8 8 days ago 103 MB
ubuntu hadoop 8dbec7cabd07 3 weeks ago 1.38 GB
ubuntu-java latest 3f7331f968a4 4 weeks ago 539 MB
docker.io/ubuntu 16.04 a51debf7e1eb 2 months ago 116 MB
docker.io/hello-world latest 4ab4c602aa5e 4 months ago 1.84 kB

[root@centos7 ~]# docker ps -al
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
96f0222698f4 springclouddemo/eureka:eureka8101 "java -Djava.secur..." 28 minutes ago Up 20 minutes 0.0.0.0:8101->8101/tcp happy_darwin

学习笔记:微服务-20 docker中运行spring boot

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