无法从主机 localhost 访问容器网络服务器

Unable to reach container webserver from host localhost

使用 Docker v 17.03.1-ce,在 linux mint 机器上,我无法使用我的浏览器(本地主机端口 9000)访问容器 Web 服务器(容器端口 5000) ) 在主机上。

容器使用命令启动:

sudo docker run -d -p 9000:5000 --name myContainer imageName

所以,服务器正在工作,因此问题出在容器和主机之间的通信中。

我检查了 iptables,但不确定该怎么做:

sudo iptables -L

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy DROP)
target     prot opt source               destination         
DOCKER-ISOLATION  all  --  anywhere             anywhere            
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
DOCKER     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain DOCKER (2 references)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             172.17.0.2           tcp dpt:5000

Chain DOCKER-ISOLATION (1 references)
target     prot opt source               destination         
DROP       all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            
RETURN     all  --  anywhere             anywhere 

sudo iptables -t nat -L -n

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
DOCKER     all  --  0.0.0.0/0            0.0.0.0/0            ADDRTYPE match dst-type LOCAL

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
DOCKER     all  --  0.0.0.0/0           !127.0.0.0/8          ADDRTYPE match dst-type LOCAL

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  all  --  172.17.0.0/16        0.0.0.0/0           
MASQUERADE  all  --  172.18.0.0/16        0.0.0.0/0           
MASQUERADE  tcp  --  172.17.0.2           172.17.0.2           tcp dpt:5000

Chain DOCKER (2 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           
DNAT       tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:9000 to:172.17.0.2:5000

预期结果:使用我的浏览器,url "localhost:9000",我可以通过端口 5000 接收容器发送的主页。

编辑:添加docker日志和dockerps

docker ps

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
59a20248c5b2        apptest             "python3 src/jboos..."   12 hours ago        Up 12 hours         0.0.0.0:9000->5000/tcp   jboost

sudo docker 记录 jboost

 * Serving Flask app "jboost_app" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 310-292-856
127.0.0.1 - - [03/Jul/2019 04:12:54] "GET / HTTP/1.1" 200 -

编辑 2:在主机上为 curl localhost:9000 添加结果 因此,当连接到我的网络浏览器时,连接不起作用,但 curl 给出了更具体的消息:

curl localhost:9000
curl: (56) Recv failure: Connection reset by peer

我在这个 post 中找到了解决方案:https://devops.stackexchange.com/questions/3380/dockerized-flask-connection-reset-by-peer

Docker 网络和端口转发工作正常。问题出在我的 flask 服务器上。似乎默认情况下,服务器配置为仅接受来自本地主机的请求。

启动 flash 服务器时,使用 "run" 命令,必须指定 host='0.0.0.0' ,以便可以提供任何 ip。

if __name__ == "__main__":
    app.run(host='0.0.0.0')