I think I am missing something obvious but I can't seem to crack this one. I am trying to map a port from a django application running uwsgi in a docker container to my local Macintosh host. Here is the setup.
Mac 10.11 running docker-machine 0.5.1 with virtualbox 5.0.10 and docker 1.9.1
I created a server with docker-machine setup my docker file and successfully built my docker container. In the container I have the following command
# Port to expose
EXPOSE 8000
Which maps to the port used via uwsgi inside the container. When I runt he container via
eval "$(docker-machine env dev)"
docker-machine ip dev
192.168.99.100
docker run -P launch
The container starts properly. If I enter the container and perform a
curl http://localhost:8000
I get my HTML as I would expect. On the outside a docker inspect container_id gets me a
"Ports": {
"8000/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "32768"
}
]
},
So i can see the mapping to 32768 on the docker-machine host of 192.168.99.100 as from the above commands. However whenever I try and curl http://192.168.99.100:32768
curl http://192.168.99.100:32768
curl: (7) Failed to connect to 192.168.99.100 port 32768: Connection refused
So any thoughts on this?? Everything should work as I understand docker.
Thanks
Craig
Since you are running through a VirtualBox VM, I would still recommend mapping the port on the VirtualBox level, as I mention in "How to connect mysql workbench to running mysql inside docker?"
VBoxManage controlvm "boot2docker-vm" --natpf1 "tcp-port8000 ,tcp,,8000,,8000"
VBoxManage controlvm "boot2docker-vm" --natpf1 "udp-port8000 ,udp,,8000,,8000"
And run the container with an explicit port mapping (instead of the random -P)
docker run -p 8000:8000 launch
Related
I have a war file deployed as Docker container on linux ec2. But when I try to hit the http://ec2-elastic-ip:8080/AppName, I don't get any response.
I have all the security group inbound rules set up for both http and https. So that's not a problem.
Debugging
I tried debugging by ssh-ing the linux instance. Tried command curl localhost:8080 , this is the response:
curl: (7) Failed to connect to localhost port 8080: Connection refused
Tried with 127.0.0.1:8080 but the same response.
Next thing I did was to list the Docker container: docker ps. I get:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
<ID> <ecr>.amazonaws.com/<my>-registry:2019-05-16.12-17-02 "catalina.sh run" 24 minutes ago Up 24 minutes 0.0.0.0:32772->8080/tcp ecs-app-24-name
Now, I connected to this container using docker exec -it <name> /bin/bash and tried checking tomcat logs which clearly shows that my application war is there and tomcat has started.
I ever tried checking the docker-machine ip default but this gave me error:
Docker machine "default" does not exist. Use "docker-machine ls" to list machines. Use "docker-machine create" to add a new one.
Now am stuck. Not able to debug further. The result am expecting is to access the app through the url above.
What to do? Is it something am doing wrong?
Also, to mention, the entire infrastructure is managed through terraform. I first create the base image,copy the war to webapps using DockerFile, push the registry image and finally do a terraform apply to apply any changes.
Make sure that apache is listening on all IP addresses inside the docker container, not just localhost. The IP should be like 0.0.0.0.
If any service is running inside docker and is listening to only localhost, it can only be accessed inside that container, not from the host.
You can also try to start apache with port 8080 and bind docker 8080 port with host 8080 port
docker run apache -p 8080:8080
Currently your app is working on a random host port i.e 32772, see the docker ps output .You must be able to access you app on http://ec2-ip:32772 once you allow port 32772 in security groups.
In order to make it work on host port 8080, you need to bind/expose the host port during docker run -
$ docker run -p 8080:8080 ......
If you are on ECS, ideally you should use an ALB & TG with your service.
However, if you are not using ALB etc then you can try giving a static hostPort in TD "hostPort": 8080(I haven't tried this). If it works fine, you will need to make sure to change the deployment strategy as "minimum healthy percentage = 0" else you might face port conflict issues.
If the application needs a network port you must EXPOSE it in the docker file.
EXPOSE <port> [<port>/<protocol>...]
In case you need that port to be mapped to a specific port on the network, you must define that when you spin up the new container.
docker run -p 8080:8080/tcp my_app
If you use run each image separately you must bind the port every time.
If you don't want to do this every time you can use docker-compose and add the ports directive in it.
ports:
- "8080:8080/tcp"
Supposing you added expose in the dockerfile, he full docker-compose.yml would look like this:
version: '1'
services:
web:
build:
ports:
- "8080:8080"
my_app:
image: my_app
I have a docker container running on my system which i started using this command:
docker run -it -v ~/some/dir -p 8000:80 3cce3211b735 bash
Now docker ps lists this:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
44de7549d38e 3cce3211b735 "bash" 14 minutes ago Up 14 minutes 22/tcp, 443/tcp, 8082/tcp, 0.0.0.0:8000->80/tcp hardcore_engelbart
Inside the container i run my django app using the command : python manage.py runserver 80
But i am not able to view the page using either of these:
1.localhost:8000
2.127.0.0.1:8000
I do understand that my 8000 port is mapped to 80 port on the container. But why am i not able to access it. I am using docker for mac not docker toolbox. Please help and comment if you need any more info.
Okay so i found the solution to my problem. The issue was not in the docker port mapping. The actual problem is this line :
python manage.py runserver 80
This runs the server on 127.0.0.1:80 . The localhost inside the docker container is not the localhost on your machine . So the solution is running the server using this command :
python manage.py runserver 0.0.0.0:80
I was able to access the webpage after this. If you run into the same problem where you are not able to connect to the django server running inside your docker container , you should try running the server on 0.0.0.0:port. You will be able to access it in your browser using localhost:port . Hope this helps someone.
I have a centOS 7.2 box as my web server hosted in aws. I found something interesting : when I run my web site using a nginx docker container, I'm able to access it from my local machine. i.e. run docker command
docker run -d -p 8000:80 my-nginx-image
and access the web site through the below url (my local machine is connected to that aws host machine via a vpn connection)
http://10.77.20.253/index.html
This works perfectly well. However, when I try to host the site using webpack-dev-server, i.e.
webpack-dev-server --host 0.0.0.0 --port 8000
I can access it from that web server with no problem, but I can't access it from my local machine. I always get a timeout error.
I then did a
netstat -anp
on that linux box, I noticed that when running from docker, it is listening on
:::8000
while when I run from wds, it was listening on
0.0.0.0:8000
I'm not sure what i'm missing here, so far I have tried
webpack-dev-server --host localhost --port 8000
webpack-dev-server --host 127.0.0.1--port 8000
webpack-dev-server --host 10.77.20.253 --port 8000 (the internal ip address)
but none of them works.
Any thoughts on it??
I created a topic with replica=2 in kafka, and kafka is running in my docker machine.
Usually, I should be able to connect to docker with port 9092. but I can't
While, I am able to connect using 32783. Not sure what's the reason?
It's the Docker run command (which is not shown in the question). 9092 internally is being mapped out to 32783,32784,32785. I am guessing the three docker run commands were -p 32783:9092 etc.
You should run it with -p 9092:9092 if you want it to be 9092 on your local machine.
On my Mac, I run Kafka in a container like this (note ADVERTISED_HOST env var):
docker run --name st-kafka -p 2181:2181 -p 9092:9092 --add-host=dockerhost:`docker-machine ip dev-st` -e ADVERTISED_HOST=`docker-machine ip dev-st` -e ADVERTISED_PORT=9092 -d spotify/kafka
I like spotify/kafka because it contains both ZK and Kafka in the same container (nice for local dev environment). The latest version is 0.8.2 I think, so you should use a different image or make your own Dockerfile with version 0.9, if that's the one you need.
I'm using boot2docker on OSX 10.10 to try to run the WSO2 governance registry. I cannot reach the app from the host machine (OSX).
Here's my Dockerfile:
FROM dockerfile/java:openjdk-7-jdk
MAINTAINER Andrew Matthews
COPY wso2greg-4.6.0.zip /opt/
RUN unzip /opt/wso2greg-4.6.0.zip -d /opt && \
rm /opt/wso2greg-4.6.0.zip
EXPOSE 9443
CMD ["/opt/wso2greg-4.6.0/bin/wso2server.sh"]
This follows a pattern used by others on docker.io for other wso2 apps.
I built it with:
docker build -t="usmsnp/wso2greg" .
and ran it with
docker run -i -t -P usmsnp/wso2greg
everything seems to proceed nicely - I get as far as the wso2 announcement:
Mgt Console URL : https://172.17.0.27:9443/carbon/
I have the boot2docker vm IP address aliased as dockerhost in my /etc/hosts file, and when I navigate to https://dockerhost:9443/carbon/ using curl I get connection refused.
Any ideas?
UPDATE: 2014-11-28
When I deploy the image to AWS using tutum, it works. So, mission accomplished, I suppose. But I'm still confused about why it doesn't work. I understand that boot2docker requires a different IP address, but I used that.
When you use docker run -P you're telling Docker to allocate a random port on the Docker daemon host - not to use 9443.
So in this case, you'll need to run docker ports <containerid> to find out what port its been mapped to.
alternativly, you need to use docker run -p 9443:9443 ... to tell Docker to map the external 9443 to the container's 9443