docker-image - w3toppers.com

Finding the layers and layer sizes for each Docker image

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How to configure the docker image for the Jenkin to create the Android build?

Error “Get https://registry-1.docker.io/v2/: net/http: request canceled” while building image

I think the issue is that you are behind the proxy which in which case you need to write a manual configuration in Docker systemd service file. That will override the default docker.service file. If you are using Docker for Windows, then simply set the default DNS to 8.8.8.8 on the “vEthernet (DockerNAT)” network adapter. … Read more

What is the difference between import and load in Docker?

docker save will indeed produce a tarball, but with all parent layers, and all tags + versions. docker export does also produce a tarball, but without any layer/history. It is often used when one wants to “flatten” an image, as illustrated in “Flatten a Docker container or image” from Thomas Uhrig: docker export <CONTAINER ID> … Read more

Can’t delete docker image with dependent child images

In some cases (like in my case) you may be trying to delete an image by specifying the image id that has multiple tags that you don’t realize exist, some of which may be used by other images. In which case, you may not want to remove the image. If you have a case of … Read more

Is there a way to combine Docker images into 1 container?

You can, with the multi-stage builds feature introduced in Docker 1.17 Take a look at this: FROM golang:1.7.3 WORKDIR /go/src/github.com/alexellis/href-counter/ RUN go get -d -v golang.org/x/net/html COPY app.go . RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app . FROM alpine:latest RUN apk –no-cache add ca-certificates WORKDIR /root/ COPY –from=0 /go/src/github.com/alexellis/href-counter/app . CMD [“./app”] … Read more

Error: Redis connection to 127.0.0.1:6379 failed – connect ECONNREFUSED 127.0.0.1:6379

Redis runs in a seperate container which has seperate virtual ethernet adapter and IP address to the container your node application is running in. You need to link the two containers or create a user defined network for them docker network create redis docker run -d –net “redis” –name redis redis docker run -d -p … Read more

docker run

To run multiple commands in docker, use /bin/bash -c and semicolon ; docker run image_name /bin/bash -c “cd /path/to/somewhere; python a.py” In case we need command2 (python) will be executed if and only if command1 (cd) returned zero (no error) exit status, use && instead of ; docker run image_name /bin/bash -c “cd /path/to/somewhere && … Read more

How to keep Docker container running after starting services?

If you are using a Dockerfile, try: ENTRYPOINT [“tail”, “-f”, “/dev/null”] (Obviously this is for dev purposes only, you shouldn’t need to keep a container alive unless it’s running a process eg. nginx…)

What is the difference between a Docker image and a container?

An instance of an image is called a container. You have an image, which is a set of layers as you describe. If you start this image, you have a running container of this image. You can have many running containers of the same image. You can see all your images with docker images whereas … Read more