- Docker Tutorial
When running docker under Windows or macOS, docker must rely on a virtual machine. Under Windows, it may use VirtualBox or other solutions, depending on your configuration, whereas it appears to use Hyperkit under macOS. These virtual machines are highly efficient, but they still carry an overhead. The Docker menu in the top status bar indicates that Docker Desktop is running, and accessible from a terminal. If you’ve just installed the app, Docker Desktop launches the onboarding tutorial. The tutorial includes a simple exercise to build an example Docker image, run it as a container, push and save the image to Docker Hub.
- Docker Useful Resources
![Docker Image For Macos Docker Image For Macos](/uploads/1/2/6/6/126622633/939518921.png)
- Selected Reading
In Docker, everything is based on Images. An image is a combination of a file system and parameters. Let’s take an example of the following command in Docker.
- The Docker command is specific and tells the Docker program on the Operating System that something needs to be done.
- The run command is used to mention that we want to create an instance of an image, which is then called a container.
- Finally, 'hello-world' represents the image from which the container is made.
Now let’s look at how we can use the CentOS image available in Docker Hub to run CentOS on our Ubuntu machine. We can do this by executing the following command on our Ubuntu machine −
Note the following points about the above sudo command −
- We are using the sudo command to ensure that it runs with root access.
- Here, centos is the name of the image we want to download from Docker Hub and install on our Ubuntu machine.
- ─it is used to mention that we want to run in interactive mode.
- Yahoo messenger for mac. /bin/bash is used to run the bash shell once CentOS is up and running.
Displaying Docker Images
To see the list of Docker images on the system, you can issue the following command.
This command is used to display all the images currently installed on the system.
Syntax
Options
None
Return Value
The output will provide the list of images on the system.
Example
Output
When we run the above command, it will produce the following result −
From the above output, you can see that the server has three images: centos, newcentos, and jenkins. Each image has the following attributes −
- TAG − This is used to logically tag images.
- Image ID − This is used to uniquely identify the image.
- Created − The number of days since the image was created.
- Virtual Size − The size of the image.
Downloading Docker Images
Images can be downloaded from Docker Hub using the Docker run command. Let’s see in detail how we can do this.
Syntax
The following syntax is used to run a command in a Docker container.
Options
- Image − This is the name of the image which is used to run the container.
Return Value
The output will run the command in the desired container.
Example
This command will download the centos image, if it is not already present, and run the OS as a container.
Output
When we run the above command, we will get the following result −
You will now see the CentOS Docker image downloaded. Now, if we run the Docker images command to see the list of images on the system, we should be able to see the centos image as well.
Removing Docker Images
The Docker images on the system can be removed via the docker rmi command. Let’s look at this command in more detail.
This command is used to remove Docker images.
Syntax
Options
- ImageID − This is the ID of the image which needs to be removed.
Return Value
The output will provide the Image ID of the deleted Image.
Example
Here, 7a86f8ffcb25 is the Image ID of the newcentos image.
Output
When we run the above command, it will produce the following result −
Let’s see some more Docker commands on images.
docker images -q
This command is used to return only the Image ID’s of the images.
Syntax
Options
- q − It tells the Docker command to return the Image ID’s only.
Return Value
The output will show only the Image ID’s of the images on the Docker host.
Example
Output
When we run the above command, it will produce the following result −
docker inspect
This command is used see the details of an image or container.
Syntax
Options
- Repository − This is the name of the Image.
Return Value
Docker Image For Macos Windows 10
The output will show detailed information on the Image.
Example
Output
![Image Image](/uploads/1/2/6/6/126622633/523878189.png)
When we run the above command, it will produce the following result −
Docker is an open source containerization system. Docker images are basically a base layout from which containers are created. To create Docker containers of different Linux distributions or apps, you have to use different Docker images. Once you create a container using a specific Docker image, the image is downloaded and stored locally on your Docker host. Overtime, you will end up with a lot of local copies of Docker images on your Docker host.In this article, I will show you how to list all the locally stored Docker images on your Docker host. So, let’s get started.
Requirements:
You must have Docker installed on your computer if you want to try out the examples in this article.
If you don’t have Docker installed, then you may check out one of the articles below (depending on your operating system) to get Docker installed on your desired Linux distribution.
- How to Install and Use Docker on Ubuntu 18.04 LTS (https://linuxhint.com/install_docker_ubuntu_1804/)
- Install Docker on Debian 9 (https://linuxhint.com/install_docker_debian_9/)
- Install Docker on CentOS 7 (https://linuxhint.com/install-docker-centos7/)
- Install Docker on Raspberry Pi (https://linuxhint.com/install_docker_raspberry_pi/)
If you still have any problem installing Docker, you may contact me through https://support.linuxhint.com. I will be more than happy to help.
Listing Locally Stored Docker Images:
To list all the locally stored Docker images, you can run the following command: Macos development for beginners part 2.
Microsoft skype for mac. As you can see, all the locally stored Docker images are listed. You can see the repository name, tag, short image ID, date of creation and size of the locally stored Docker images.
The short image ID is enough to distinguish between the Docker images uniquely. But if you prefer the long image ID, you can use the –no-trunc option with the previous command.
To list the locally stored Docker images along with the long image ID, run the following command:
As you can see, the long sha256 format of the image ID is displayed.
Listing Docker Intermediary or Bad Images:
Parental controls software for network macos free. Docker intermediary images has the repository and tag name <none>:<none>. These are basically unused Docker images. They don’t have any importance. You should remove them occasionally.
To list all the unused Docker images on your Docker host, run the following command:
As you can see, all the unused Docker images along with their image ID, creation date, size are listed.
Listing Only Docker Image IDs:
At times, you may only need a list of image IDs of the locally stored Docker images on your Docker host. This is very important for scripting purpose and for removing Docker images.
To list only the image IDs of the unused Docker images on your Docker host, run the following command:
As you can see, only the image ID of the unused Docker images are listed.
Docker Image For Mac Os X
To list all the image IDs of the good Docker images, run the following command:
As you can see, only the image ID of the good Docker images are listed.
So, that’s how you list locally stored Docker images on your Docker host. Thanks for reading this article.