Question

我是Docker的新手

Docker版本18.03.0-ce，在RHEL 7上运行构建0520e24。

我使用Spring tutorial创建了一个简单的ReST服务。超级jar在我的Windows机器上运行正常，我可以通过浏览器访问该服务。

Dockerfile：

# fetch basic image
FROM openjdk:latest

# application placed into /opt/app
RUN mkdir -p /opt/app
WORKDIR /opt/app

# local application port
EXPOSE 8080

现在，我执行了以下步骤

1.建立图像

docker build --tag=java-rest

2.运行容器

docker run -p 18080:8080 -t -i java-rest

3.检查容器是否已启动

[root@l5341t ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS                          PORTS                     NAMES
38ec56c99135        java-rest           "bash"              About a minute ago   Up About a minute               0.0.0.0:18080->8080/tcp   infallible_yalow

4.将jar文件复制到容器

docker cp /localhome/ojoqcu/code/java/gs-rest-service-0.1.0.jar 38ec56c99135:/opt/app/gs-rest-service-0.1.0.jar

5.运行容器和罐子

docker run -p 18080:8080 -t -i java-rest
root@38ec56c99135:/opt/app# ls
gs-rest-service-0.1.0.jar
root@38ec56c99135:/opt/app#
root@38ec56c99135:/opt/app#
root@38ec56c99135:/opt/app# java -jar gs-rest-service-0.1.0.jar

6.在容器上，应用程序正在运行

root@38ec56c99135:/opt/app# ps -eaf
UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 13:43 pts/0    00:00:00 bash
root         8     1  0 13:47 pts/0    00:00:14 java -jar gs-rest-service-0.1.0.
root        54     0  0 14:16 pts/1    00:00:00 bash
root        60    54  0 14:17 pts/1    00:00:00 ps -eaf

回复：

1.从同一台机器（RHEL 7）

[root@l5341t ~]# curl http://localhost:18080
<HTML>
<HEAD><TITLE>Redirection</TITLE></HEAD>
<BODY><H1>Redirect</H1></BODY>
[root@l5341t ~]#



[root@l5341t ~]# curl http://0.0.0.0:18080
<HTML><HEAD>
<TITLE>Network Error</TITLE>
</HEAD>
<BODY>
<FONT face="Helvetica">
<big><strong></strong></big><BR>
</FONT>
<blockquote>
<TABLE border=0 cellPadding=1 width="80%">
<TR><TD>
<FONT face="Helvetica">
<big>Network Error (tcp_error)</big>
<BR>
<BR>
</FONT>
</TD></TR>
<TR><TD>
<FONT face="Helvetica">
A communication error occurred: ""
</FONT>
</TD></TR>
<TR><TD>
<FONT face="Helvetica">
The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.
</FONT>
</TD></TR>
<TR><TD>
<FONT face="Helvetica" SIZE=2>
<BR>
For assistance, contact your network support team.
</FONT>
</TD></TR>
</TABLE>
</blockquote>
</FONT>
</BODY></HTML>
[root@l5341t ~]#



[root@l5341t ~]# curl http://l5341t:18080
<HTML><HEAD>
<TITLE>Network Error</TITLE>
</HEAD>
<BODY>
<FONT face="Helvetica">
<big><strong></strong></big><BR>
</FONT>
<blockquote>
<TABLE border=0 cellPadding=1 width="80%">
<TR><TD>
<FONT face="Helvetica">
<big>Network Error (dns_unresolved_hostname)</big>
<BR>
<BR>
</FONT>
</TD></TR>
<TR><TD>
<FONT face="Helvetica">
Your requested host "l5341t" could not be resolved by DNS.
</FONT>
</TD></TR>
<TR><TD>
<FONT face="Helvetica">

</FONT>
</TD></TR>
<TR><TD>
<FONT face="Helvetica" SIZE=2>
<BR>
For assistance, contact your network support team.
</FONT>
</TD></TR>
</TABLE>
</blockquote>
</FONT>
</BODY></HTML>
[root@l5341t ~]#
[root@l5341t ~]#

2.从我当地的Windows机器浏览器（我认为它仍然在使用Spring Boot的嵌入式服务器但不确定！）

http://l5341t:18080/
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu May 24 14:13:44 UTC 2018
There was an unexpected error (type=Not Found, status=404).
No message available

Answer 1

我没有深入挖掘Spring代码（它在WIndows / Linux机器上完美运行，但不在容器中运行！）但似乎问题实际上是代码而不是Docker配置。我找到了答案here。

Java ReST服务在docker上运行但无法访问

1 个答案: