I am completely stuck on the following.
Trying to setup a express app in docker on an Azure VM.
1) VM is all good after using docker-machine create -driver azure ...
2) Build image all good after:
//Dockerfile
FROM iojs:onbuild
ADD package.json package.json
ADD src src
RUN npm install
EXPOSE 8080
CMD ["node", "src/server.js"]
Here's where I'm stuck:
I have tried all of the following plus many more:
• docker run -P (Then adding end points in azure)
• docker run -p 80:8080
• docker run -p 80:2756 (2756, the port created during docker-machine create)
• docker run -p 8080:80
If someone could explain azure's setup with VIP vs internal vs docker expose.
So at the end of all this, every port that I try to hit with Azure's:
AzureVirtualIP:ALL_THE_PORT
I just always get back a ERR_CONNECTION_REFUSED
For sure the express app is running because I get the console log info.
Any ideas?
Thanks
Starting from the outside and working your way in, debugging:
Outside Azure
<start your container on the Azure VM, then>
$ curl $yourhost:80
On the VM
$ docker run -p 80:8080 -d laslo
882a5e774d7004183ab264237aa5e217972ace19ac2d8dd9e9d02a94b221f236
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
64f4d98b9c75 laslo:latest node src/server.js 5 seconds ago up 5 seconds 0.0.0.0:80->8080 something_funny
$ curl localhost:80
That 0.0.0.0:80->8080 shows you that your port forwarding is in effect. If you run other containers, don't have the right privileges or have other networking problems, Docker might give you a container without forwarding the ports.
If this works but the first test didn't, then you didn't open the ports to your VM correctly. It could be that you need to set up the Azure endpoint, or that you've got a firewall running on the VM.
In the container
$ docker run -p 80:8080 --name=test -d laslo
882a5e774d7004183ab264237aa5e217972ace19ac2d8dd9e9d02a94b221f236
$ docker exec it test bash
# curl localhost:8080
In this last one, we get inside the container itself. Curl might not be installed, so maybe you have to apt-get install curl first.
If this doesn't work, then your Express server isn't listening on port 80, and you need to check the setup.
Related
I've cloned the following dockerized MEVN app and would like to access it from another PC on the local network.
The box that docker is running on has an ip of 192.168.0.111 but going to http://192.168.0.111:8080/ from another PC just says it can't be reached. I run other services like plex and a minecraft server that can be reached with this ip so I assume it is a docker config issue. I am pretty new to docker.
Here is the Dockerfile for the poral. I made a slight change from the repo adding -p 8080:8080 because I read elsewhere that it would open it up to lan access.
FROM node:16.15.0
RUN mkdir -p /usr/src/www &&
apt-get -y update &&
npm install -g http-server
COPY . /usr/src/vue
WORKDIR /usr/src/vue
RUN npm install
RUN npm run build
RUN cp -r /usr/src/vue/dist/* /usr/src/www
WORKDIR /usr/src/www
EXPOSE 8080
CMD http-server -p 8080:8080 --log-ip
Don't put -p 8080:8080 in the Dockerfile!
You should first build your docker image using docker build command.
docker build -t myapp .
once you've built the image, and confirmed using docker images you can run it using docker run command
docker run -p 8080:8080 myapp
Docker listens 0.0.0.0 IP address and the other machines on the same network can use your ip address to show your website on which port did you use for sharing. For example you use 8080 and actually you listen 0.0.0.0:8080 and the other machines http://192.168.0.111:8080/ can reach that website with your ip address. Without docker you can also listen 0.0.0.0 to share your app on network.
The box that docker is running on
What u mean by saying "BOX"? Is it some kind of virtual box or maybe actual computer with Linux or Windows or maybe MacOS?
Have u checked particular "BOX"'s firewall? (u may need to do "NAT" over firewall to particular in "BOX" running service for incoming requests from outside of "BOX").
I'll be happy to help u our if u'll provide more detailed information about your environment...
I have a NodeJS/Vue app that I can run fine until I try to put it in a Docker container. I am using project structure like:
When I do npm run dev I get the output:
listmymeds#1.0.0 dev /Users/.../projects/myproject
webpack-dev-server --inline --progress --config build/webpack.dev.conf.js
and then it builds many modules before giving me the message:
DONE Compiled successfully in 8119ms
I Your application is running here: http://localhost:8080
then I am able to connect via browser at localhost:8080
Here is my Dockerfile:
FROM node:9.11.2-alpine
RUN mkdir -p /app
WORKDIR /app
COPY package.json /app
RUN npm install
COPY . /app
CMD npm run dev
EXPOSE 8080
I then create a docker image with docker build -t myproject . and see the image listed via docker images
I then run docker run -p 8080:8080 myproject and get a message that my application is running here: localhost:8080
However, when I either use a browser or Postman to GET localhost:8080 there is no response.
Also, when I run the container from the command line, it appears to lock up so I have to close the terminal. Not sure if that is related or not though...
UPDATE:
I trying following the Docker logs such as
docker logs --follow
and there is nothing other than the last line that my application is running on localhost:8080
This would seem to indicate that my http requests are never making into my container right?
I also tried the suggestion to
CMD node_modules/.bin/webpack-dev-server --host 0.0.0.0
but that failed to even start.
It occurred to me that perhaps there is a Docker network issue, perhaps resulting in an earlier attempt at kong api learning. So I run docker network ls and see
NETWORK ID NAME DRIVER SCOPE
1f11e97987db bridge bridge local
73e3a7ce36eb host host local
423ab7feaa3c none null local
I have been unable to stop, disconnect or remove any of these networks. I think the 'bridge' might be one Kong created, but it won't let me whack it. There are no other containers running, and I have deleted all images other than the one I am using here.
Answer
It turns out that I had this in my config/index.js:
module.exports = {
dev: {
// Various Dev Server settings
host: 'localhost',
port: 8080,
Per Joachim Schirrmacher excellent help, I changed host from localhost to 0.0.0.0 and that allowed the container to receive the requests from the host.
With a plain vanilla express.js setup this works as expected. So, it must have something to do with your Vue application.
Try the following steps to find the source of the problem:
Check if the container is started or if it exits immediately (docker ps)
If the container runs, check if the port mapping is set up correctly. It needs to be 0.0.0.0:8080->8080/tcp
Check the logs of the container (docker logs <container_name>)
Connect to the container (docker exec -it <container_name> sh) and check if node_modules exists and contains all
EDIT
Seeing your last change of your question, I recommend starting the container with the -dit options: docker run -dit -p 8080:8080 myproject to make it go to the background, so that you don't need to hard-stop it by closing the terminal.
Make sure that only one container of your image runs by inspecting docker ps.
EDIT2
After discussing the problem in chat, we found that in the Vue.js configuration there was a restriction to 'localhost'. After changing it to '0.0.0.0', connections from the container's host system are accepted as well.
With Docker version 18.03 and above it is also possible to set the host to 'host.docker.internal' to prevent connections other than from the host system.
I started a docker image using
docker run --interactive --tty node_web_1
And the running server inside the container successfully prints
Running on http://localhost:8080
in the console. I have exposed port 8080 in the Dockerfile. So in my understanding, when I call http://localhost:8080 in the browser in windows, I should access the server in the container, right? I get no reply though....
How do I go about finding the error? I executed the command
docker-machine ls
as suggested here How to access Docker container's web server from host but apparently I have no docker-machines running? What are those machines? Do I need them? I have only docker for windows installed, no additionall packages or shells.
try to publish your port
docker run -p 8080:8080 -it node_web_1
Is there a way to bind ports to containers without passing an argument via the run command? I do not like starting my containers with the 'docker run' command so using the -p argument is not an option for me. I like to start my containers with the 'docker start containername' command. I would like to specify the hostname of the docker-server with the port number (http://dockerserver:8081) and this should then be forwarded to my container's app which is listening on port 8081. My setup is on Azure but is pretty basic so the Azure docker plugin looks a bit like overkill. I read up about the expose command but seems like you still need to use the 'docker run -p' command to get access to the container from the outside. Any suggestions would be very much appreciated.
docker run is just a shortcut for docker create + docker start. Ports need to be exposed when a container is created, so the -p option is available in docker create:
docker create -d -p 80:80 --name web nginx:alpine
docker start web
Port publishing only does ports though.
If you want the hostname passed to the container, you'll need to do it with a command option or (more likely) an environment variable - defined with ENV in the Dockerfile and passed with -e in docker create.
I set up a one-click docker server on DigitalOcean, then ssh'd into it as root#[Server IP] and ran the following
docker pull continuumio/memex-explorer
docker run -p 80:5000 continuumio/memex-explorer
Which outputs:
* Starting OpenBSD Secure Shell server sshd
...done.
* Running on http://0.0.0.0:5000/
* Restarting with reloader
Then when I navigate to [Server IP]:5000 it doesn't display anything. I expected it to present the landing page of the app.
I then ran
ufw allow 5000/tcp
ufw allow 80/tcp
ufw enable
but it didn't help.
Can anyone install and set up this app? There's a link to the source of the app I'm trying to run: Here, and the docker image: Here
It looks like you just needed to run it in detached mode.
I just provisioned a droplet on Digital Ocean and spun up the Docker image with this run command:
sudo docker run -d -p 80:5000 --name memex continuumio/memex_explorer
There is no need to change any firewall settings.
Make sure the container is active:
sudo docker ps
It should display something like this:
64242f576c16 continuumio/memex_explorer:latest "/root/memex-explore 35 minutes ago Up 35 minutes 22/tcp, 80/tcp, 0.0.0.0:80->5000/tcp memex
To see the application running, just type the Digital Ocean [Server IP] into the URL for the browser. The port is redirected to port 80 so no need to type it in.
You can attach to the container and look around (the Dockerfile is available in the image as well).
sudo docker exec memex bash