In my computer I have been manually installed the docker and also docker desktop. I know now there are two docker engines running in my computer. My question is " When I start docker desktop my default engine is changed. How to switch between this docker desktop engine and my previous engine?
Related
I've a local Docker Desktop installation with local images for Redis, Elastic Search, MySQL etc. I want to move from Docker Desktop to Rancher Desktop. How can I configure Rancher Desktop to use already existing docker containers, images and volumes?
Is it even possible?
I am using a mac and apparently installing Docker Desktop is mandatory to use Docker in macOS. Why Docker Desktop is required in Mac and Windows OS, and not in Linux? What purpose Docker Desktop serves? I have tried googling it but can't find appropriate answers.
docker desktop for both mac and windows is using a Linux virtual machine behind the scenes for running regular docker daemon.
Reference
That state docker for windows is using WSL2 which is running a VM.
Here there is a mention of backing up docker VM on docker for mac.
Docker Desktop handles the setup and teardown of lightweight VMs on both Windows and macOS, using Hyper-V on Windows desktops and Hyperkit on macOS.
From docker blog .
I am new to working with containers, and was doing the docker/vscode tutorial (https://learn.microsoft.com/en-us/visualstudio/docker/tutorials/deploy-to-cloud).
The following issue has arisen during deployment (Step 9 of tutorial):
Containers deployed to Azure Cloud Instances do not show up in the sidebar.
Instead it says: "Failed to connect. Is Docker running?" and "Error: 14 UNAVAILABLE: No connection established"
This is counterintuitiv, as deployment via VScode actually worked.
Docker seems to be correctly installed:
$ docker -v
Docker version 20.10.2, build 2291f61
and the container is running:
$ docker ps
CONTAINER ID IMAGE COMMAND STATUS PORTS
agitated-newton leopkcode/getting-started Running <IP>:<PORT>
so why are running container instances not showing up in the left sidebar of the Docker extension?
I am running VSCode on WSL2.
I can reproduce this issue, the problem is that your docker engine or Docker Desktop on Windows is not running. See Install Docker Desktop on Windows.
Once the docker desktop is running and refreshes the containers in the VS docker extension. The ACI will display in the left sidebar of the Docker extension.
As pointed out by #Nancy Xiong, the issue must have been related to the local Docker installation. The exact nature is unclear, as I had made sure that both Docker engine and Docker Desktop were installed and running. Nonetheless:
Re-installing Docker Desktop Desktop (not Docker Engine) did solve the issue.
I have a zendframework 2 website that need a linux OS, and the website use a search engine that run on windows OS (IIS). How to use docker to run the website and the search engine at the same time?
Iam new to docker, I will appreciate if someone can help with docker-compose.yml and Dockerfile.
Docker uses the kernel in the system that you are using on the host machine to run the container, so if you have a linux machine with docker installed you can only run images of containers that uses a linux kernerl.
So you can't have a windows container on a linux machine.
Also this can help
From Docker's documentation, I read both Docker for Mac and the Docker Toolbox can coexist.
So I thought I could use these images created by Docker for Mac, but when I switched to Docker Toolbox, it turned out that I was wrong, because I entered docker images in Docker Quickstart Terminal.app and no image was listed.
Is there a way to achieve this?
Docker-for-Mac sets up a small virtual machine via hyperkit, which is a xhyve-based virtualization solution.
The quickstart terminal also sets up a small virtual machine, but it uses the docker-machine tool to create a virtualbox VM.
Both of these approaches are valid approaches to get a running Docker-in-a-vm-on-your-mac, but they are different VMs.
Similarly, if I have a regular linux machine at my desk, and I pull an image, you won't see that image in the docker daemon on the linux machine at your desk.
Both tools can coexist, but they don't share data.
You can't share images directly between Docker for Mac and Docker Toolbox. They are two different and independent systems.
In Docker for Mac, the docker daemon is running inside an Alpine linux vm controlled by a small hypervisor (Xhyve). In Docker Toolbox, the docker daemon runs inside a boot2docker vm controlled by VirtualBox.
You can't directly communicate between the two, but you can save the image using docker save (documentation here):
docker save image_from_dockertoolbox > toolbox.tar
and then use docker load (documentation) to load it after changing to docker4mac:
docker load < toolbox.tar.gz