I am trying to create a simple docker container with go mod and 1.18.
my app runs in 8080 port but i wanna run in :80 port
Dockerfile
FROM golang:1.18
WORKDIR /usr/src/app
# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
COPY go.mod go.sum ./
RUN go mod download && go mod verify
COPY . .
RUN go build -o server
CMD [ "./server" ]
so i run docker build:
docker build -t go-k8s .
and docker run
docker run --rm -p 8080:8080 go-k8s:latest
And nothing happens :(
As larsks says, you need to bind from the external port 80 to the internal port 8080 using the 80:8080 syntax.
Something else to consider is making sure that your app is listening on all interfaces in your development environment.
This question seems at least vaguely related to yours
Related
I have a node project and it has Dockerfile and docker-compose.yml as well.
Dockerfile
FROM node:lts-alpine as build-stage
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build
FROM nginx:stable-alpine as production-stage
COPY --from=build-stage /app/dist /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]
docker-compose.yml
version: '3'
services:
my-service-name:
build:
context: .
dockerfile: Dockerfile
ports:
- "8080:80"
restart: unless-stopped
I uploaded the image to Docker Hub. When I tried to pull the image and run it, I needed to specify the port like this docker run -p 8080:80 my-username/my-image-name so I can open the project in localhost:8080 from NGINX expose 80.
What I want to do is run the image without specifying the port since I already specified the port in Dockerfile and docker-compose. I've been confused with how to achieve this. Does this mean my docker-compose is not uploaded to the Docker Hub and I should do so? Or is my current way is already correct?
When you use a docker-compose file, you have to run it with the docker-compose executable. What you are doing is bypassing the compose file altogether.
You are misinterpreting the meaning of EXPOSE in the Dockerfile. From the documentation:
The EXPOSE instruction does not actually publish the port. It functions as a type of documentation between the person who builds the image and the person who runs the container, about which ports are intended to be published. To actually publish the port when running the container, use the -p flag on docker run to publish and map one or more ports, or the -P flag to publish all exposed ports and map them to high-order ports.
So feel free to run containers without specifying exposed ports on the docker command line or in Docker-Compose or anywhere else The containers will run but it's like they are behind a firewall.
I have a .Net 3.1 API running as a Docker container (WSL2+ Linux Containers) on Windows 10. I am unable to access the API on any other ports except 5000 :
When i run the container as
docker run -d -p 8060:7110 golide/payapi:0.1.0
and try a GET in Postman to http://localhost:7110/weatherforecast I get "Unable to Connect" exception.
But when i run the container as
docker run -d -p 5000:5000 golide/payapi:0.1.0
and try a GET in Postman to http://localhost:5000/weatherforecast I get the API response.
What am I missing regarding how Kestrel port binding works ?
My Dockerfile looks as follows :
FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
WORKDIR /app
# Copy csproj and restore as distinct layers
COPY *.csproj ./
RUN dotnet restore
# Copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out
# Build runtime image
FROM mcr.microsoft.com/dotnet/aspnet:3.1
WORKDIR /app
ENV ASPNETCORE_URLS http://+:5000
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "PaymentsAPI.dll"]
What additional configuration should I do (if any) in order to access the API on any other port ?
For the port (-p) option of docker run, the format looks like <host-port>:<container-port>. Since you used a value of 8060:7110 and attempted to access localhost:7110 on the host, you're targeting the wrong port. You should be targeting 8060 from the host, or swap the position of the ports if that's what you need.
Then you'd also want to have ENV ASPNETCORE_URLS http://+:<container-port> set in your Dockerfile as well.
I have a web app that uses go language as it's back end. When I run my website I just do go build; ./projectName then it will run on local server port 8000. How do I run this web app on a container? I can run sample images like nginx on a container, but how do I create my own images for my projects. I created a Dockerfile inside my project folder with the following codes:
FROM nginx:latest
WORKDIR static/html/
COPY . /usr/src/app
Then made an image using the Dockerfile, but when I run it on a container and go to localhost:myPort/static/html/page.html it says 404 page not found. My other question is, does docker can only run static pages on a container? cause my site can receive and send data. Thanks
this is my docker file (./todo is my project name and folder name)
this is my terminal ( as you can see the the container exits emmediately)
I guess you are not exposing the Docker Port outside the container.
That's why you are not able to see any output rather than just being specific to GO Program.
Try adding the below lines to your docker compose File
EXPOSE 80(whichever port you want it to be)
EXPOSE 443
EXPOSE 3306
This will make the container be accessed from outside
Here is what i did for my GOlang web app use Gin-gonic framework -
my Dockerfile:
FROM golang:latest
# Author
MAINTAINER dangminhtruong
# Create working folder
RUN mkdir /app
COPY . /app
RUN apt -y update && apt -y install git
RUN go get github.com/go-sql-driver/mysql
RUN go get github.com/gosimple/slug
RUN go get github.com/gin-gonic/gin
RUN go get gopkg.in/russross/blackfriday.v2
RUN go get github.com/gin-gonic/contrib/sessions
WORKDIR /app
Then build docker image
docker build -t web-app:latest .
Finally, start my web-app
docker run -it -p 80:8080 -d web-app:latest go run main.go //My webapp start at 8080 port
Hope this helpfull
You don't need Nginx to run a server in Go
It's better to build a binary in Dockerfile
Here is how your Dockerfile may look like:
FROM golang:latest
RUN mkdir /app
ADD . /app/
WORKDIR /app
RUN go build -o main .
EXPOSE 8000
CMD ["/app/main"]
I am totally new to docker and the client I am working for have sent me dockerfile configuration .dockerignore file probably to set up the work environment.
So this is basically what he sent to me
FROM node:8
# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY package.json package-lock.json ./
RUN npm install
COPY assets ./assets
COPY server ./server
COPY docs ./docs
COPY internals ./internals
COPY track ./track
RUN npm run build:dll
COPY . .
EXPOSE 3000
CMD [ "npm", "start" ]
with docker build and run command (he also provided the same)
docker build -t reponame:tag .
docker run -p 3000:3000 admin-web:v1
Here, First can someone tell me what does copy . . mean?
He asked me to configure all the ports accordingly. From going through videos, I remember that we can map ports like this -p 3000:3000 but what does configuring port means? and how can i do? any relevant article for the same would also be helpful. Do I need to make docker-compose file?
. is current directory in linux. So basicly: copy current local directory to the current container's directory.
The switch -p is used to configure port mapping. -p 2900:3000 means publish your local port 2900 to container's 3000 port so that the container is available on the outside (by your web browser for instance). Without that mapping the port would not be available to access outside the container. This port is still available to other containers inside same docker network though.
You don't need to make a docker-compose.yml file, but it certainly will make your life easier if you have one, because then you can just run docker-compose up every time to run the container instead of having to run
docker run -p 3000:3000 admin-web:v1
every time you want to start your applicaton.
Btw here is one of the ultimate docker cheatsheets that I got from a friend, might help you: https://gist.github.com/ruanbekker/4e8e4ca9b82b103973eaaea4ac81aa5f
I have my Dockerfile:
FROM microsoft/aspnetcore-build:2.0 AS build
WORKDIR /build
COPY . .
RUN dotnet restore
RUN dotnet publish -c Release -o output
FROM microsoft/aspnetcore:2.0
WORKDIR /app
COPY --from=build /build/output .
ENTRYPOINT ["dotnet","TestDockerApi.dll"]
I am creating an image using :
docker build -t testdocker/api .
and then running a container from image using :
docker run testdocker/api
I can see following message on my console:
Hosting environment: Production
Content root path: /app
Now listening on: http://[::]:80
Application started. Press Ctrl+C to shut down.
I am trying to access using http://localhost/app/TestDockerApi/Values , but it does not work.
Do I need to use docker image IP to access that .
I can see few tutorials suggesting to do this in Entrypoint :
ENTRYPOINT ["dotnet","TestDockerApi.dll","--server.urls","http://0.0.0.0:5000"]
And then while running the container, mapping the port:
docker run -p 80:5000 testdocker/api
Is there any way I could access the API with out using portforwarding? I am just trying to get the basics right , why and what should I do.
The Dockerfile does not manage network configuration outside of the container at all. If you want docker to listen on your host port of 80, you need to bind it when you run your container.
docker run -80:80 testdocker/api
For more description about mapping and exposing ports, you can read here:
- https://www.ctl.io/developers/blog/post/docker-networking-rules/
Alternatively you can create your own service composition where you specify these details and specify this in a docker-compose.yml file
api:
image: testdocker/api
ports:
- "80:80"
And then you can simply run with
docker-compose up
More information is at:
https://docs.docker.com/compose/reference/overview/#command-options-overview-and-help