Today in this article, we will see resolution steps for errors like the docker daemon is not running.

Issue Description – The Docker Daemon is not running

Docker daemon fails to start up on Windows or stops for some reason and when you try to run any commands:

error during connect: Get http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.30/info: open //./pipe/docker_engine: The system cannot find the file specified. In the default daemon configuration on Windows,
the docker client must be run elevated to connect. This error may also indicate that the docker daemon is not running.

OR

if you see any of the below errors while running,

Today we will cover the below resolution as a possible fix to the issue,

Resolution 1: Start the Docker service

This error meant the docker daemon is unreachable.

Docker daemon fails to start up on Windows or Cloud Container or stops for some reason and especially when you try to run any commands.

To fix such types of issues restarting the service will resolve the error. If not please check the resolution steps 2 as explained below.

Steps:

From Start ->Search ->Please type in below,

services.msc

This will open the Services Windows GUI. Please restart the Docker Desktop Service” by right-clicking ->restart option. Please make sure the services are in the “Running” state.

Other options for Restart – Docker services

Alternatively one can use the below command to stop and restart the service from any CLI.

net stop com.docker.service

net start com.docker.service

The service name can be retrieved from the service GUI.

Please check and validate if the docker is working fine. If not please use a few other options as mentioned below.

Ensure that the Docker daemon is active and running. If it’s not running, start it using the appropriate command based on your operating system:

Example commands other OS

docker daemon not running Linux 

sudo systemctl start docker   (Linux)

docker daemon not running Windows

docker desktop (Windows or macOS)

Resolution 2: DockerCli.exe -SwitchDaemon configuration

It could be possible that your Docker CLI is not properly configured for Windows or Linux.

Please use the below commands to point the Docker CLI to either Linux containers or Windows containers.

From Power Shell:

PS C:\Program Files\Docker\Docker> ./DockerCli.exe -SwitchDaemon

Please check and validate if the docker is working fine. If not please use a few other options as mentioned below.

Resolution 3 – Restart the docker service using GUI

Using Docker Desktop GUI from Settings -> Reset – Restart Docker Desktop.

Once started successfully you shall see a green running icon as below,

Please check and validate if the docker is working fine. If not please use a few other options as mentioned below.

Other CLI command Example

sudo systemctl restart docker (Linux)

Resolution 4 – Firewall settings

Please check your security software if it is blocking the docker to create a network interface.

You should also check firewall software to not block any installation or configuration.

Resolution 5 – Restart

RESTART Docker– Universal solution and if it doesn’t work out please raise a help ticket with Docker.

Other measures to fix – Docker Daemon is not running

• Check Docker Disk Space

Docker requires adequate disk space to store images and containers.

Ensure that there is enough free disk space on the system where Docker is installed.

If the disk is full, Docker may fail to run or behave unexpectedly.

• Check Docker Version

Ensure that you have the latest version of Docker installed on your system.

Old versions may have known issues or compatibility problems.

• Reinstall Docker

If the above steps do not resolve the issue, consider reinstalling Docker.

First, uninstall the current Docker installation and then download and install the latest version from the official Docker website.

• Troubleshoot using Docker Documentation

For more specific or complex issues, refer to the official Docker documentation and troubleshooting guides for your specific operating system.

That’s all! Happy coding!

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Today in this article, we will see how to Import or copy Docker Container Images to Azure Private Registry using step by step guide.

Here you can use simple Azure CLI or Power CLI commands to copy or import ready images from a public registry like DockerHub.

We will see below how to import the Docker Images from DockerHub without using any docker commands.

Getting started – Import from Docker Hub

Please login to the Azure Cloud subscription account and have a resource group ready so as to use this feature.

Step 1- Create Azure container registry

If you already have ACR created you can skip this step.

Let’s use the below steps to create an Azure Container registry.

Command

az acr create --resource-group myResourceGroup
--name myRegistry --sku Basic

Example

az acr create --resource-group thecodebuzz-group --name TheCodeBuzzRegistry --sku basic

Step 2- Import Image from Docker Hub

I have the below images in the remote Docker hub.

Command

az acr import  --name myRegistry 
--source docker.io/<repo-name>/<image-name>:<tag-name> --image <image-name>:<tag-name>

OR

If You need to use a Docker username and password for authentication,

az acr import  --name myRegistry 
--source docker.io/<repo-name>/<image-name>:<tag-name> --image <image-name>:<tag-name> --username <username> --password <password>

Example

az acr import --name TheCodeBuzzRegistry --source docker.io/firstthecodebuzz/forazureacr:v1 --image forazureacr:v1 --username firstthecodebuzz --password *****



 

Once executed you shall be able to import the image into the Azure private registry. Please wait some time to get the import finished successfully.

Verify or List container images from Azure Registry

Please use the below command to list and verify available images in the Azure registry,

Command

az acr repository list --name myRegistryName --output table

Example

az acr repository list --name thecodebuzzregistry --output table

OR

az acr repository list --name thecodebuzzregistry.azurecr.io --output table

Finally, you shall see that your docker image was successfully imported from the docker hub to the Azure private registry.

References:

• Docker- Containerize an Angular App with NGNIX

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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Today in this article, we will see the resolution for the docker error “denied: requested access to the resource is denied”.

Issue Description

Docker push commands give access denied error as below,

denied: requested access to the resource is denied

Resolution

While pushing an image or a repository to a docker remote registry, you might get an error that the requested access to the resource is denied.

In such scenarios, please make sure to follow the below steps to correct the issue.

Root cause

• Attempting to pull or push an image from or to a container registry without proper authentication or permissions could cause the access denied error.

To fix this issue, you need to ensure that you have the appropriate access rights to the container registry you are trying to interact with.

Login issues could occur due to multiple reasons for example,

Other root causes are also due to,

• TAG missing for the docker containers, or

• Missing the fully qualified name of your docker while performing docker operations.

Resolutions

Please login to the correct Docker hub account

docker login <registry-url>

Validate authentication or permissions while pulling or pushing an image from or to a container registry

For any additional issues please perform the below,

Create a TAG that refers to the Source TAG

Let’s first check the available images in your local and then tag them appropriately.

Above I have an image “thecodebuzzapp” with TAG as “latest“.

This image I would like to push this to the docker hub.

Let’s use the below command to tag our target image with the source tag below

Command – Create a TAG

docker tag local-image:tagname new-repo:tagname

Where,

• local-image – Is the name or Id of the local image. In the above example “thecodebuzzapp” is the image name.

• tagname – TAG name used for the local image. In the above example “latest” is the TAG name.

• new-repo – This is the target/remote repository name where you would like to push the docker local image

• tagname – TAG name used for target/remote image

Before you can push an image to your docker registry, you must tag it with the

fully qualified name of your docker login server.

Example – Associate TAG

docker tag thecodebuzzapp:latest firstthecodebuzz/myfirstapp:coolapp

To avoid any issues, keep the names in lowercase and try using fully qualified name of docker login server

Push the image to the remote Docker Hub

Let’s now push the image to the docker repository using the below command,

Command – Push Image to Remote docker

docker push new-repo:tagname

Example -Push Image to Remote docker

docker push firstthecodebuzz/myfirstapp:coolapp

Finally, you shall see your docker image successfully pushed,

Still an issue – Additional checks

• Check the necessary access permissions on the container registry are acquired. Ensure that you have the appropriate permissions based on your intended actions (pull or push).

• Verify Registry URL: Ensure that you are using the correct URL for the container registry.

• Check for Proxy Settings (if applicable): If you are behind a corporate firewall or using a proxy server, check if Docker is configured to work with the proxy.

• Clear Docker Cache: Sometimes, Docker cache can cause authentication issues. Try clearing the Docker cache

References :

• Docker- Containerize an Angular App with NGNIX

• Build App in a Docker Container-Getting Started

That’s all! Happy coding!

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Do you have any better solutions or suggestions? Please sound off your comments below.

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Today in this article, we will see how to list files in a stopped Docker Container.

You might find the need to view, refer or explore files from running containers or stopped containers on multiple occasions.

In this article, we will see a couple of approaches that could be useful to view the files in paused or stopped containers,

• Commit Stopped Container to a new image

• Copy files from Container to Host

Approach 1 – Commit Stopped Container to a new image

Committing a container’s file changes or settings into a new image could be useful notable times.

This feature lets you debug a container or help you to export a working dataset to other servers.

Please see the below steps to use the commit command.

Step1 – Commit the stopped container to a new image,

Command

docker commit <CONTAINER_ID> <New Image Name>

Example

docker commit 1cf2eafdee49 backup-container

Above ‘backup-container’ is the new image

Step2 – Run the new image in a new container

Run the new image in a new container with a bash-shell or shell

Command

docker run -ti --entrypoint=bash <new image>

Step 3 – Run the list file command in the new container.

Approach 2 – Copy Files from Docker Container to Host

Docker “cp” utility let you copy files from the container’s file system to the local machine or from the local filesystem to the container.

docker cp <container>:<container-path> <host-path>

cp command to work, Containers can be a running or stopped

Below we are copying the file from the container to the host path.

Once copied, the host path can be used to explore the files.

Below is now how you can check all the files and directory

dir path

References:

• Build App in a Docker Container-Getting Started

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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Today in this article, we will see how to Copy Files from Docker Container to Host.

This technique is also useful if containers are stopped or paused as well.

Command

docker cp <container>:<container-source-path> <destination-path>

The docker cp the utility copies the contents of the Source Container to the target path specified.

You can copy from the container’s file system to the local machine or vice versa.

Below we are copying the file from the container to the host path.

Once copied, the host path can be used to explore the files.

Example

Below command is executed on windows,

docker cp 1cf2eafdee49:app test\docker-dump

Below is now how you can check all the files and directory

dir path

References:

• Build App in a Docker Container-Getting Started

• Dockerize an Angular App with NGNIX

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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The post How to Copy Files from Docker Container to Host first appeared on TheCodeBuzz.