Docker Training

Docker has a client-server architecture. At the first level, Docker Client is present which sends commands to Docker Daemon or Server. Docker Daemon receives commands from Docker Client either through CLI (Command Line Interface) or REST APIs. Docker Daemon is responsible for all actions related to Containers. Images are the basic building blocks, i.e. all containers are built from the images. Images are maintained and organized in a layered manner.

Docker is very popular because it has changed the software application delivery and deployment landscape. To begin with, Docker is very easy to learn and to use. It helps in the scaling of systems and faster and better delivery of software applications. Also, the rise of the Microservices architecture led to the popularity of Docker. 

The major purpose of Docker is to deploy applications to the production environment as required by operations. Docker is a tool made to create, deploy, and run applications by using containers.  

You can use Docker –  

• To run multiple applications on one server  
• To learn new technologies – you don’t need to spend time on installation and configuration  
• As version control system for running entire set of apps on OS  
• To distribute or collaborate on apps OS with a team  
• When an app needs to go through multiple phases of development  

Docker is written in the Go programming language.

The cost of Docker depends on the edition you want to use.  

• Basic Enterprise Edition - $750/Year  
• Standard Enterprise Edition - $1,500/Year  
• Advanced Enterprise Edition - $2,000/Year  

Docker helps create, deploy, and manage applications in an efficient manner and thus helps both Developers and System administrators.  By virtue of this, Docker becomes an essential DevOps tool.  

Yes, Docker is a deployment tool. As a DevOps tool, Docker is used to automate the deployment of applications in lightweight containers.  

Docker is not a build tool, but it does help decrease the complexity and increase the efficiency of a build environment, since it puts the entire build environment into a Docker container. 

Docker can run on Linux, Windows, and Mac platforms.

The time needed for learning Docker will depend on your experience. Here is a 5-day plan that can help you learn the fundamental concepts of Docker and how to use it.

Day 1: The first day is for the introduction. Today, you have to focus on theoretical concepts like Why Docker is used, how Docker was created, the basic terminologies container, images, etc.

Day 2: The second day involves using some of the most essential commands of Docker. You will learn how to pull an Nginx Docker image, run an Nginx container, use the ‘detach’ mode to run a container, run commands inside a container, and commands for container management.

Day 3: This day is for going deeper into Docker and learning about Storage and Networks. This will include Storage in Docker, Using Nginx containers with bind mounts, Using Volumes with Mongo image, Networks in Docker, and Connecting two containers on the same network.

Day 4: Now is the time for Dockerfiles. You must learn what the Dockerfiles are used for, using Dockerfiles for dockerizing a static website, and Dockerizing a NodeJS Express application.

Day 5: The last day is for learning ‘Docker Compose’. This is a tool used for Docker local development. With Docker Compose, you can centralize the ‘build’, ‘run’, and ‘create volume’ in a file named docker-compose.yml. You have to also learn how to write a docker-compose file.

To get deeper, it is recommended that you go for a Docker course. There is still so much left to learn and training will help you get an understanding of everything.

Before you decide between learning Kubernetes or Docker, you must know that they are not direct competitors. Docker is a containerization platform. Kubernetes, on the other hand, is the container orchestrator for container platforms such as Docker.

Containers are an important aspect of application development as they can solve a critical issue. While writing codes, developers wear their own local development environment. The code might work perfectly in this environment but not when you move it to production. The reason for this can be different operating systems, libraries and dependencies. Containers separate the code from the underlying infrastructure. All that developers have to do is pack up the application with all the libraries and bins into a small container image. You can run this container on any computer with a containerization platform.

Docker is one of the most popular container platforms. It is an open standard for the packaging and distribution of containerized applications. But this leads to another problem. How can these containers be scheduled and coordinated? How can an application be upgraded without any interruption of service? The solution for these problems include programs like Kubernetes, Docker Swarm, and Mesos that provided an abstraction for making a cluster of machines act like one big machine. This is vital for a large-scale environment.

Kubernetes is a container orchestrator used for automating deployment, scaling, and scheduling containerized applications. It supports several containerization tools like Docker. Currently, it is the market leader in orchestrating containers.

Docker is a tool and platform used to build, distribute, and run Docker containers. Kubernetes is a container orchestration system that can be used for Docker containers. It is more extensive than Docker Swarm and can coordinate node clusters at scale in production. You can run a Docker build on the Kubernetes cluster. However, Kubernetes is not a complete solution in itself and you have to include custom plugins.

You can use Docker without Kubernetes, In fact, this is common practice as even though Kubernetes has several advantages, it is extremely complex. You need a container runtime for orchestrating the container. So, you will need to use Kubernetes with a container platform like Docker.

Here is what you should learn before starting Docker: 

• Understanding the basics of terminal or command prompt.
• Linux basics like SSH, shells, and package managers.
• Basics of how to create a server in the cloud.
• Understanding the basics of database and web servers.

Here is why you should learn Docker:

1. Cost Savings - Docker can dramatically reduce infrastructure resources. With Docker, you need fewer resources for running the same application. This way, companies can save everything from the cost of servers to the employees required for maintaining them.
2. Productivity and Standardization - Through Docker containers, you can ensure consistency across different release cycles, this standardizing your environment. Docker offers repeatable environments for developing, building, testing, and production. With a Standardized service infrastructure for the entire pipeline, every member can work in a production parity environment.
3. Efficient CI - With Docker, you can build a container image that can be used for every step of deployment. This way, you will be able to separate the non-dependent steps to run them in parallel. It will also speed up the time from build to production.
4. Maintainability and Compatibility - Parity is one of the main benefits of Docker. It means that regardless of the server you are using or the laptop you are running on, the images will run the same.
5. Simplicity - Docker is known to simplify the matter. The environment of the application is no longer linked to the infrastructure requirements.

All developers must learn Docker. This is because, a few years from now, recruiters hiring for software developers will automatically filter out those who have not worked with any DevOps orchestration tools.

Ever since DevOps orchestration tools were released, a lot of tasks, mainly from the Ops side, have been cut short. Also, Docker is an important deployment tool as well. There are two categories in Deployment:

1. Containerization
2. Configuration management

The best benefit offered by Docker is that it keeps the development, building, and production environment consistent. This means that there will be no sudden bugs or failures. This is why it is important that developers know how to use Docker.

• Step#1 - Download Docker 
• Step#2 - Double-click InstallDocker.msi to run the installer  
• Step#3 - Follow the Install Wizard: - Accept the license, Authorize the installer, and Proceed with the install. 
• Step#4 - Click Finish to launch Docker 
• Step#5 - Docker then automatically starts 
• Step#6 - Docker loads a “Welcome” window giving you tips and access to the Docker documentation  

The Whale (from Docker Logo) in the taskbar indicates the running Docker instance.   

Open a Windows terminal (Command prompt) or PowerShell and type – docker run hello-world 

You should get a message – “Hello from Docker …”. This verifies that Docker has been installed successfully.  

Yes, you can run Docker on Windows and this requires the installation of the Docker Toolbox on Windows. You can then run Docker on Windows successfully.  

Docker is used to offset the various disadvantages that Virtualization brings. By using Docker, developer teams can create applications with multiple features. They can upgrade, test, and deploy them in a much faster and efficient manner leading to a shorter release cycle and faster time-to-market. 

Some major use cases of Docker are–  

• Code Pipeline management  
• Simplified Configuration  
• Increased Developer productivity  
• Application Isolation  
• Integration testing at scale  
• Debugging Capabilities  

Docker is used for Continuous deployment of multiple applications in the production environment during the DevOps cycle or process.  

There are over 12,000 companies all over the world that use Docker technology. Majority of these companies are American and from the IT sector. JPMorgan Chase, ThoughtWorks, Inc., Docker, Inc., Neudesic, and SLALOM, LLC are the top 5 companies that use the Docker tool.     

Yes, it is safe to use Docker in production environment. But the important thing to keep in mind is that as a user you should implement all the safety measures in place. From applying updates to running CI tests to monitoring containers periodically and running the latest versions – the safety measures must be adhered to.   

Ideally, there are no specific prerequisites to learn Docker, but it is good to have some basic understanding of Command LineInterface and Text Editor.  

Then, move some resources on Docker from docker official website.Then, it is recommended to take some online or in-person training from good certified training institutes. 

Regular practice and application of learning through live projects and use cases should help you gain a better grasp of Docker.  

Some good resources are –  

• Docker Documentation (Docker Website) 
• Docker Training (Docker Website) 
• Learn Docker 
• Docker Curriculum 
• Docker at GitHub 
• Docket at YouTube 

Luckily, to learn Docker all you need is a basic understanding of Command Line Interface and Text Editor. Also, an idea on Linux Administration and Networking is important.  

Some understanding on the concepts such as – Virtualization, Virtual Machines, Containers will greatly help you understand the important role Docker plays in the web application development, management and deployment.  

Developers can gain more by learning Docker.  

To begin with, Docker is a relatively easier technology to learn and implement. The other advantages are –  

• Greatly enhanced Developer environment helping developers build apps with much ease and efficiency  
• Developers can get to focus purely on development aspect as Docker creates a much more friendly and collaborative environment with administrators and testers  
• Eliminates environment inconsistencies and fastens production process  
• Easier to manage development with different technology stacks operating  

From a career perspective –  

• Developers who learn Docker will stand at a great advantage keeping in mind the need for and the popularity of DevOps process  

Docker is not difficult to learn. Having said that, the learning curve depends a lot on your enthusiasm/intent and your understanding of basic concepts.  

If you are already a developer, learning the basics of Docker shouldn’t be that difficult and you can go on to learn about building Docker images and building Code inside the containers.  

If you are not a developer but a fresher, no worries. It’d be good to begin with understanding the basics of– DevOps, Virtualization, Virtual Machines, Containerization – and how all of these play a great role in the development of web applications.  

Becoming a Docker expert takes time and mindful practice. But with persistence, that can be achieved!  

The route to becoming an expert starts with a – 

• Strong foundation on the basics  
• Then, you will need to get training from certified institutes/professionals 
• Have a good grasp on – Docker Filesystems, Docker, Compose, Machine  
• Learn all about Orchestration – allows to move from containers to services  
• Practice and Practice a lot, it just helps you get better at executing Docker  
• Look for latest developments from the Docker community  
• If possible, attend some Docker meet-ups  
• Take on Live cases and continue to contribute to the Docker community  

At KnowledgeHut, we have experienced professionals training students from across the globe. The curriculum is structured in such a way that it will help you gain a good grasp on the essentials and the advanced concepts.  

• The very first thing to understand is the need for faster product development and release, in an efficient manner   
• It all begins with developing great web apps and how DevOps plays a role, and within the DevOps world – how Docker plays a great role  
• You will be a highly valued expert if you begin by getting a good hold on Docker basics and advanced concepts. Post that, you will need to work on and solve some live use cases and impress upon your clients  
• Also, get to understand the DevOps concept and add new DevOps skills, this will be a differentiating factor  
• Your intent and interest towards knowing more on Docker will  lead you on the path of becoming an expert  

You will receive a course completion certificate issued by KnowledgeHut on successful completion of: 

• 24+hrs of Live Sessions 
• 50+hrs of MCQs And Assignments 
• 3 Live Projects 
• 20+ hrs of Hands-On With Dockers And Containers 

The course completion certificate offered by KnowledgeHut has lifetime validity. 

Docker’s popularity is growing by the day – 2 out of 3 companies that try Docker end up adopting it. Docker adoption was up by 30% (in the year 2018), and this is a sign of what Docker is heading towards. The future scope for learning Docker is huge and will only continue to grow as more organizations adopt the technology. 

As a Docker skilled professional, your career options and opportunities will enhance greatly.  

As mentioned earlier, Docker professionals are in demand as organizations are quickly embracing Docker as a DevOps technology.  

At KnowledgeHut, our in-depth and career-oriented training on Docker will help you gain a firm hold on the concepts and make you job-ready.  

The training is Instructor-led, the curriculum is designed by experts and you will be mentored by some top industry leaders in Docker.  

There is a great demand for Docker certified professional in today’s market. Usually, a Software Engineer with Docker skills earns an average of $95,861 per annum. 

Note: The data mentioned here is as of September 2019. 

Gradually, there will be a shift from being a “developer” to becoming a “developer with Docker skills”.  

Organizations are looking to hire developers with DevOps skills as the need to create, deploy, and release products faster, is the norm of the day. Professionals with Docker skills will stand to gain advantage as they will form an integral part of DevOps teams. As more organizations have started adopting DevOps, there will be a greater demand for Docker software professionals.   

Typically, companies hire Docker experts to manage the configuration system. This can range from start-ups and mid-level to Multi-national organizations. The type of companies hiring Docker professionals are Computer software, IT services, Staffing & Recruiting companies, Internet, Healthcare, Financial Services companies, Computer Hardware, Retail, Consulting, and Telecommunication industries.