详解如何将Spring Boot应用跑在Docker容器中

@RestController 
@SpringBootApplication 
public class DemoApplication { 
 
  @GetMapping("/hello") 
  public String hello() { 
    return "Hello World"; 
  } 
 
  public static void main(String[] args) { 
    SpringApplication.run(DemoApplication.class, args); 
  } 
} 

mvn clean package -Dmaven.test.skip=true 
java -jar target/demo-0.0.1-SNAPSHOT.jar 

From java:8 
 
 
VOLUME /tmp 
 
#将打包好后的Jar文件放到image中 
Add target/demo-0.0.1-SNAPSHOT.jar app.jar 
# change file access and modification times 
RUN bash -c 'touch /app.jar' 
 
EXPOSE 8080 
#容器启动的时候运行Jar文件 
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"] 

docker build -t demo8 . 

Sending build context to Docker daemon 14.84MB 
Step 1/6 : FROM java:8 
 ---> d23bdf5b1b1b 
Step 2/6 : VOLUME /tmp 
 ---> Using cache 
 ---> 91086d8b7c77 
Step 3/6 : ADD target/demo-0.0.1-SNAPSHOT.jar app.jar 
 ---> d161bed06e8b 
Step 4/6 : RUN bash -c 'touch /app.jar' 
 ---> Running in 9fbaff628989 
 ---> 1fc0498bbb06 
Removing intermediate container 9fbaff628989 
Step 5/6 : EXPOSE 8080 
 ---> Running in a5c44244b267 
 ---> 3b5150c5bdd0 
Removing intermediate container a5c44244b267 
Step 6/6 : ENTRYPOINT java -Djava.security.egd=file:/dev/./urandom -jar /app.jar 
 ---> Running in b7a3baac9d47 
 ---> 23ef7cc5e1b0 
Removing intermediate container b7a3baac9d47 
Successfully built 23ef7cc5e1b0 
Successfully tagged demo8:latest 

docker run -d -p 4000:8080 demo8 

± % curl localhost:4000/hello 
Hello World% 

± % docker ps !10172 
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 
5f1b7f29a0b6 988ed6f466b5 "java -Djava.secur..." 29 minutes ago Up 29 minutes 0.0.0.0:4000->8080/tcp practical_jones 
± % docker exec -it 5f1b7f29a0b6 /bin/bash 
root@5f1b7f29a0b6:/ curl localhost:8080/hello 
Hello World