{"id":150,"date":"2023-01-04T08:23:05","date_gmt":"2023-01-04T08:23:05","guid":{"rendered":"http:\/\/cloudkul.com\/blog\/?p=150"},"modified":"2024-12-23T11:44:33","modified_gmt":"2024-12-23T11:44:33","slug":"start-your-journey-with-docker","status":"publish","type":"post","link":"https:\/\/cloudkul.com\/blog\/start-your-journey-with-docker\/","title":{"rendered":"Start your journey with Docker….!!!"},"content":{"rendered":"\n

Let’s talk about Docker. As you have read in earlier blogs.<\/a><\/strong><\/p>\n\n\n\n

What exactly docker is?<\/strong><\/h2>\n\n\n\n

Now let’s talk about the next question, What makes Docker so attractive<\/a> & how does it work ??<\/p>\n\n\n\n

Around 10 Years ago, when the virtual machines started, we realized that virtual machines shared the same hardware with the base machine.<\/p>\n\n\n\n

The goal of virtual machines was to ensure that if one failed, then it wouldn’t impact the host. Additionally, they provided isolated environments for various applications.<\/p>\n\n\n\n

In short, a virtual machine is a resource through which we can create an elusion for the app that has its own environment. <\/p>\n\n\n\n

But even at that time base machine had an enormous load of various virtualized machines, to overcome this situation a new application was launched named ‘docker’.<\/p>\n\n\n\n

It is a very lightweight application and shares the kernel with the base machine in other words it virtualized the environment rather than virtualizing a machine.<\/p>\n\n\n\n

The main thing I would like to share with you is we have to install the Docker application<\/a> and then we can run 10-15 containers or more than that on the single base machine without any problem.<\/p>\n\n\n\n

Like in our Laptop, we can’t install 10-15 virtual machines as various applications need their own environment. <\/p>\n\n\n\n

So, on your laptop, if there is docker installed, then you can work very easily anywhere around the world. However, It does not have any dependency issues.<\/p>\n\n\n\n

Docker containers<\/a> can use their own ports, allowing two containers with Apache on port 80 to run on different ports simultaneously.<\/p>\n\n\n\n

[DOCKER IN DOCKER\u2019s TERM\u2026]<\/strong><\/span><\/p>\n\n\n\n

BUILD ONCE, CONFIGURE ONCE & RUN ANYWHERE\u2026\u2026..<\/strong><\/span><\/p>\n\n\n\n

There is also one more component in docker DOCKER INDEX\u2026.<\/strong><\/p>\n\n\n\n

You must be thinking about what the Docker index is.<\/strong><\/p>\n\n\n\n

Let’s talk about the docker index, it is basically a git repository that contains docker containers and all. You can push containers in that repository or pull containers just like git.<\/p>\n\n\n\n

These all points make Docker so attractive\u2026.<\/strong><\/p>\n\n\n\n

Now let’s talk about how does docker work?<\/h2>\n\n\n\n

Let me tell you one thing Docker\u2019s commands are too simple and user-friendly. You only just need to understand the flow of its commands.<\/p>\n\n\n\n

ok, let’s install docker in your ubuntu os machine\u2026.<\/p>\n\n\n\n

First, open the terminal and go to the root user by typing:<\/p>\n\n\n\n

sudo -s<\/pre>\n\n\n\n
then update your system by typing:<\/p>\n\n\n\n
apt-get update<\/pre>\n\n\n\n
Now check curl if it is not installed then type:<\/p>\n\n\n\n
apt-get install curl<\/pre>\n\n\n\n
Get the latest Docker package with the mentioned command:<\/span><\/p>\n\n\n\n
curl -sSL https:\/\/get.docker.com\/ | sh<\/pre>\n\n\n\n
now verify whether the Docker is installed or not, type:<\/p>\n\n\n\n
docker --version<\/pre>\n\n\n\n
docker version should be 20.10.22.<\/strong><\/p>\n\n\n\n
[Note: you can get lots of ways to install docker in just a few commands but to install an updated version, follow the procedure.]<\/span><\/p>\n\n\n\n
Now let’s learn how to run the docker<\/strong><\/h2>\n\n\n\n
First, you have to download the docker\u2019s image like I want to download the ubuntu-20.04 image then download it by typing:<\/p>\n\n\n\n
docker pull ubuntu:20.04<\/pre>\n\n\n\n
it will pull the image from the dockerhub<\/p>\n\n\n\n
After pulling it, you can list the images by typing:<\/p>\n\n\n\n
docker images<\/pre>\n\n\n\n
Then, it will show you the complete downloaded images that you have in your system<\/p>\n\n\n\n
after that just hit the command to use docker\u2019s image:<\/p>\n\n\n\n
docker run -i -t ubuntu:20.04<\/pre>\n\n\n\n
The command gives you a terminal to run or install anything. To save changes, you must commit the container by opening another terminal and typing as the root user:<\/p>\n\n\n\n
docker commit your_container_id your_container-name<\/pre>\n\n\n\n
now the question arises how do we get to know the container\u2019s ID & container\u2019s name?<\/p>\n\n\n\n
Here, you can check your container\u2019s ID and name by typing:<\/p>\n\n\n\n
docker ps<\/pre>\n\n\n\n
after committing it, your container is ready to use.<\/p>\n\n\n\n
[ Note: <\/strong><\/span>Remember, don’t exit or run another container without committing your changes, or you’ll lose your work. Use docker commit<\/code> to save your changes. ]<\/strong><\/span><\/p>\n\n\n\n
now if you want to run your container in daemonize mode then you have to hit the command:<\/p>\n\n\n\n
docker run -i -d container_name<\/pre>\n\n\n\n
To stop running the container:<\/p>\n\n\n\n
docker stop container_id<\/pre>\n\n\n\n
To remove the container:<\/p>\n\n\n\n
docker rm container-id<\/pre>\n\n\n\n
 All basic commands are:<\/p>\n\n\n\n
attach:-Attach to a running containerit<\/pre>\n\n\n\n
Terminologies –<\/h2>\n\n\n\n