Containers 101: What is container technology, what is Kubernetes and why do you need them?
What are containers?
Containers make it possible, regardless of the operating system or infrastructure environment, for an application to run continuously and efficiently. Containers do this by pooling all the code, runtime, system resources, system libraries and settings that a service requires to run, providing a lightweight, standalone, executable kit
What is a container used for?
In addition to technologies such as DevOps, cloud-native, AI and deep learning, containers reflect the future of computing. Cases of common use include:
- Cloud modernization of current systems
- Build new apps that leverage the advantages of containers
- Isolating microservices and distributed applications, launching, scaling and maintaining them
- Improving the efficiency/efficiency of DevOps through streamlined build/test/deployment
- Providing stable development environments for developers, separated from other applications and processes
- Simplifying and speeding up repeated roles
- Facilitating hybrid and multicloud computing environments, as containers can work regularly anywhere
What is containerization?
Containerization, the act of developing a container, means pulling out and abstracting from the operating system and the underlying infrastructure only the application/service you need to run, along with its dependencies and configuration. It is then possible to run the resulting container picture on any container platform.
What are the benefits of containers?
- Containers are lightweight: Compared to virtual machines, containers are powerful and light on resources since they are separated from the OS layer.
- Containers are portable: you can write once and switch between environments since the container contains all of the dependencies and configurations.
- Containers are scalable: because of their small size, containers spin up quickly, scale on the fly, spin down when not in use and restart quickly when needed.
- Containers can be cost-effective: Containers provide a solution that is resilient, fast-paced and cost-effective through reduced resource requirements and smart scaling.
- Containers need fewer infrastructure to be managed: Containers force you to get to the nuts and bolts of what you really need, to provide your clients with an experience that better fits them. This makes it easy to handle infrastructure, since there is less infrastructure to manage.
- Containers allow focus: IT teams spend less time on guest operating systems and physical hardware, allowing them to participate in important business ventures.
- Containers accelerate growth: Containers provide a stable, predictable environment in which CPU/memory is optimized and portability infrastructure code is abstracted.
- Containers unlock modern architecture: developers can split applications into microservices using containers, which can speed up development and be scaled separately when deployed.
What are the challenges of containers?
- Containers are relatively new: in 2014, Kubernetes was first launched and quickly gained market adoption. Being a “hot tech” will make finding seasoned technologists who know how to function in containerized environments difficult.
- Not all services are containerized: If your application depends on non-containerized services, you can need to spend heavily to convert it into a solution for containers.
- Containers need improvements in processes and skills: Containers can speed up the transition to more agile, productive development, but this can mean drastic changes to the current processes of development, implementation, analysis and monitoring. Similarly, it may be appropriate to change and retrain current teams.
- The technology is rapidly evolving: this is not unique to containers, but the fast-paced nature of container technology means that you need people on hand (or partners) to make sound decisions, minimize risk and ensure that organizational inertia does not stymie implementation.
- Containers are not a silver bullet: a list of advantages and containers which look perfect, but serious thinking is required for any transformation. You have to consider what you have to deal with, what’s going to work and what’s not going to work with, or find someone to assist you through it.
Related Topics to Kubernetes
- How to Safely Drain a Node in Kubernetes – (Kubernetics)
- How to Delete a Service in Kubernetes – Complete Guide
- Setting up Windows Container Service on a Kubernetes Cluster
- Kubernetes Cluster Deployment on CentOS (and Other Linux)
- Kubectl command – How to Add or Remove Labels to Nodes in Kubernetes
- 10 Interview Questions on Kubernetes for SDET/Devops Set-03 (ReplicaSet in K8S)
Containers vs. virtual machines
Containers and virtual machines are both “packages.” A container is a package that includes your application and everything it needs to run, aside from the operating system. A virtual machine is a package that includes your application and everything it needs to run, including the operating system itself.
On a single operating system, you can run multiple containers. And, on a single piece of hardware, you can run several virtual machines. On virtual machines, you can also run containers.
One big advantage containers have over virtual machines is that, since they don’t include the operating system, containers need less system resources and less overhead. They also tend to start/stop more easily and are ultra-portable across environments. However, when they’re idle, they also take up infrastructure power, which can run up unnecessary costs.
Docker vs. Kubernetes
Docker technology makes it possible to build and operate containers, and what constitutes a “container” is the industry standard. Kubernetes (abbreviated as k8s) enables all of your containerized workloads, including provisioning, networking, load balancing, securing and scaling, to be handled (or “orchestrated”).
Docker can be run standalone without Kubernetes, but Kubernetes cannot function without a container service like Docker.
As of 2021, Docker has essentially all of the containerization space’s market share. In the industry, there are several competing Kubernetes products, with self-managed Kubernetes deployed in 50 percent of StackRox surveyed businesses. Kubernetes (50 percent), Amazon EKS (44 percent), Azure AKS (31 percent), RedHat OpenShift (22 percent) and Amazon ECS are self-managed in the top five (20 percent ).
What is container orchestration?
Container orchestration may not be sufficient if you have just a handful of containers and two or three applications. But things get complicated as the numbers rise. Container orchestration from Kubernetes allows the automated deployment, scale and management of thousands of containerized applications.
Benefits of Kubernetes container orchestration include:
- Discovery of Resources and Load Balancing
- Mount storage structures of your choosing automatically
- Automated rollbacks and rollouts
- Optimal resource utilization
- Kubernetes self-healing (restart failed containers; destroy those not responding to user-defined health checks)
- Store confidential details and handle it
- Deploy and upgrade settings without having to restore container images
What are the main container tools and technologies?
The major names in container space are Docker and Kubernetes. Docker is an open source framework for containers. The most common container orchestration option is Kubernetes, although alternatives exist, such as Docker Swarm and VMware Tanzu. Containers as a service (CaaS) products are also provided by major cloud providers, including AWS, Google and Microsoft Azure.
When are containers the best option and when should you consider something different?
If you are designing a new application from scratch, looking to incorporate a microservices-based architecture, or looking for an ultra-portable, build-once-deploy-anywhere solution, containers are a great choice. But what about the monolithic, current applications?
Much like certain physical machines do not translate to virtual machines, there may not be good containerization candidates for applications that need a lot of resources. You’d need to split up how it operates to make a CPU and RAM hungry program into a jar. For little or no gain, this would entail development time and cash and would therefore not be justified.
Container solutions from Rackspace Technology
The Rackspace Technology experts have considerable experience in architecting and designing technologies for containerization platforms. Using the container orchestration framework that will provide you with the most value, through Kubernetes, DockerSwarm and Rancher, and cloud-native tools such as ECS, EKS, AKS and GKE, we take an agnostic approach.
In coclusion, there are experts will work closely with you from the beginning of your containerization project to understand your application architecture. Finally, design and develop a full container solution that incorporates networking, volumes, computing resources, and more. Start today with your containerization journey.
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![A list of top 15 IT certifications in demand for 2021 in in this post. IT certifications can help you quickly gain and validate valuable skills and know-how in a domain that will further your career. Here are the most popular IT certs today (Most in-Demand IT Certifications for Beginners & Pros). Certifications can validate your IT skills and experience to show employers you have the expertise to get the job done. You can get certified in skills you already have or skills you’d like to put to use in your career — whatever your reason, certifications are a great way to strengthen your resume and set yourself apart from other candidates in a job search. According to the 2021 IT Salary report from Robert Half, IT professionals holding the following popular certifications can earn 5% to 10% more than their peers. Whether you’re just starting out and building your resume or you’ve been in the industry for 20 years, there’s a certification that can help boost your salary and your career. [Get ahead with the top certs for big data, project management, agile, data science, IT management and the cloud, as well as the top-paying certs and emerging certifications for today’s hottest skills. | Get weekly career tips by signing up for hybridcloudtech.com newsletter.] Check out these related topics to IT Certifications for Beginners; 2021 Best Salary Paying IT Certifications in-DemandTop Paying Cloud Certifications in Highest Demand TodayCybersecurity Institutions in the US & 6 Courses to ChooseLearning Cybersecurity | 6 Best Courses to Register 15 Most in-demand certifications for 2021 Microsoft Certified Azure Solutions ArchitectMicrosoft Certified Solutions Associate (MCSA)Oracle Certified MySQL Database Administrator (CMDBA)Project Management Professional (PMP)Salesforce Certified Development Lifecycle and Deployment DesignerAWS Certified Solutions Architect – ProfessionalCisco Certified Internetwork Expert (CCIE)Cisco Certified Network Associate (CCNA)Cisco Certified Professional Network Professional (CCNP)Certified Cloud Security Professional (CCSP)Certified Data Privacy Solutions Engineer (CDPSE)Certified Data Professional (CDP)Certified Ethical Hacker (CEH)Certified Information Security manager (CISM)Certified Information Systems Security Professional (CISSP) Microsoft Certified Solutions Associate (MCSA) Microsoft offers several Certified Solutions Associate (MCSA) certifications in topics such as BI reporting, Office 365, database development, web applications, Windows Server, Windows 10 and several other Microsoft products and services. The MCSA certification is designed for entry-level tech workers, so if you’re just starting out in your IT career, you’ll find these certifications helpful for strengthening your resume. Please note, however, that Microsoft is revamping its certification program, and the MCSA is giving way to role-based certifications. Average annual salary:$75,000 Oracle Certified MySQL Database Administrator (CMDBA) The MySQL Database Administration (CMDBA) certification offered through Oracle University is designed for database administrators who want to prove their skills with increasing performance, integrating business process, and managing business process and data. The certification allows you to “prove your ability to deliver reliability and performance to current and future employers” and to gain “in-demand skills to scale database applications and integrate your business.” Certification paths include Professional, Specialist, and Developer — you will need to pass the MySQL Database Administrator Certified Professional Exam Part 1 and Part 2 to earn your certification. Average annual salary: $88,873 Project Management Professional (PMP) The PMP certification is offered through Project Management Institute and is targeted at advanced project management professionals. The certification is listed in the top 5 in demand IT Certifications for Beginners. Additionally, it covers the fundamentals of project management, including the five main stages of a project’s life cycle: initiating, planning, executing, monitoring, and controlling and closing. To take the exam, you’ll need at least a four-year degree and three years of experience in project management, 4,500 hours of leading and directing projects and 35 hours of project management education. If you have a secondary degree, you’ll need five years of experience, 7,500 hours leading and directing projects and 35 hours of project management education. Average annual salary: $106,000 Salesforce Certified Development Lifecycle and Deployment Designer The Salesforce Certified Development Lifecycle and Deployment Designer certification falls under Salesforce’s architect certifications track. This certification exam is offered as a specialization you can take under the Certified Systems Architect certification path. It’s designed for IT pros responsible for assessing the company’s architecture environment and requirements and certifies your ability to implement management solutions on the Salesforce platform. If you look at the full list of IT Certifications for Beginners, you may be advised to have basic knowledge of cloud computing. Average annual salary: $91,000 AWS Certified Solutions Architect – Professional Amazon offers a long list of AWS certifications, but the AWS Certified Solutions Architect is one of the most popular cloud computing certifications you can earn. AWS is widely used at companies large and small, so whether you already work for a company using AWS or plan to in the future, it’s a good choice for your resume. The certification focuses on your ability to design and deploy scalable systems on AWS with a focus on keeping it cost effective without sacrificing on security, reliability and quality. Average annual salary (according to PayScale): $113,000 Cisco Certified Internetwork Expert (CCIE) The Cisco Certified Internetwork Expert (CCIE) certification is the highest level of certification you can reach in Cisco’s program. The expert-level certifications are offered in specialty areas, including enterprise infrastructure, enterprise wireless, data center, security, service provider and collaboration. Once you have passed your CCIE exam in your topic of choice, you will have reached the highest level of Cisco certification currently available. Before you can earn your expert-level certification, it’s recommended to have at least five to seven years of experience in the certification subject. Average annual salary: $126,000 Cisco Certified Network Associate (CCNA) The Cisco Certified Network Associate (CCNA) certification is offered in several specializations, including security, wireless, routing and switching. In addition, it also includes industrial, Internet of Things (IoT), data center, cyber operations, collaboration and cloud. That being said, it is also among the IT Certifications for Beginners and professional. However, beginners are to have prior knowledge on cloud computing techniques. Therefore, note that the exam covers network fundamentals, network access, IP connectivity, IP services, security fundamentals and automation and programmability. You’ll need at least one year of experience working with Cisco products and services, basic knowledge of IP addressing and a strong understanding of network fundamentals to pass the exam. Average annual salary: $78,000 Cisco Certified Network Professional (CCNP) The Cisco Certified Network Professional (CCNP) certifications will be the next step on your Cisco certification journey after you earn your CCNA. With CCNP, you can choose to be certified in enterprise, data center, security, service provider, collaboration, CyberOps or DevNet. You’ll need to pass an exam at the CCNP level to move on to the final expert level of certifications. It’s recommended to have at least three to five years of experience in any certification path you choose. Average annual salary: $95,000 Microsoft Certified Azure Solutions Architect Expert The Microsoft Certified Azure Solutions Architect Expert Certification is designed for cloud professionals who are responsible for advising stakeholders and building reliable cloud solutions for the business. The expert-level exam covers your skills and knowledge when it comes to deploying and configuring infrastructure, implementing workloads and security, and creating and deploying apps. The exam also covers topics such as designing a data platform solution, business continuity and infrastructure strategy, and how to develop for the cloud. You’ll need to know how to determine workload requirements, design data platform solutions, create a business continuity strategy, and design for deployment, migration, and integration. Average annual salary: $119,412 Certified Cloud Security Professional (CCSP) The Certified Cloud Security Professional (CCSP) certification is offered through the International Information System Security Certification Consortium (ISC)². The certification demonstrates your knowledge and abilities when designing, managing and securing data, applications and infrastructure in the cloud. It’s designed for those working with cloud technology including enterprise architects, security administrators, systems engineers, security architects, systems architects or consultants, engineers or managers. The certification exam covers cloud concepts, architecture, design, security and risk and compliance. While not required, the (ISC)² recommends having at least five years of experience in IT, with at least three years in information security and one year in one or more of the six domains found in the CCSP CBOK. Average annual salary: $118,559 Certified Data Privacy Solutions Engineer (CDPSE) The Certified Data Privacy Solutions Engineer (CDPSE) certification offered through the ISACA is designed to demonstrate you have the skills to navigate the increasing complexity of data privacy and security. Secondly, its among the Best IT Certifications for Beginners. Also, it’s an experience-based technical certification that assesses your ability to “implement privacy by design which results in privacy technology platforms and products that build trust and advance data privacy.” To qualify for the exam, you will need at least five years’ experience in privacy governance and architecture. But if you already hold a CISA, CRISC, CISM, CGEIT or CSX-P certification, the 2 years of the experience requirement will be waived. Average annual salary: No data yet as this is a relatively new certification Certified Data Professional (CDP) Available from the Institute for Certification of Computing Professionals (ICCP), the Certified Data Professional (CDP) certification offers several learning paths. CDP candidates can choose from a range of domains, including business analytics, data analytics and design, data governance, data integration and interoperability, data management, data warehousing, enterprise data architecture, information systems or IT management and more. The CDP is offered at various levels starting with foundation and moving on to associate, mastery, principal and ending at the final level of executive management. CDP has been named among the most in-demand IT Certifications for Beginners for 2021/2022. Average annual salary: $45,000 Certified Ethical Hacker Offered through the EC-Council, the Certified Ethical Hacker (CEH) certification demonstrates your ability to find vulnerabilities in computer systems and to prevent hacking. As an ethical hacker, you’re someone who uses the same skills, techniques and knowledge as a malicious hacker to help establish better security measures to prevent future attacks. Ethical hackers are responsible for finding weaknesses in the organization’s networks and systems, and then use that knowledge to protect the company against potential threats. Average annual salary: $81,000 Certified Information Security manager (CISM) The ISACA’s Certified Information Security Manager (CISM) certification covers information security governance — a topic that is a growing concern for businesses globally. The certification is designed for IT pros who work with or manage IT security and want to demonstrate their expertise in information security governance, information risk management, information security program development and management and information security incident management. It’s recommended to have experience in IS or IT security — the certification is aimed at those working in IT who have an eye on the management track. Average annual salary: $126,525 Certified Information Systems Security Professional (CISSP) The Certified Information Systems Security Professional (CISSP) certification offered through the (ISC)² demonstrates your knowledge and abilities with IT security and information assurance. The certification covers topics such as organizational structure, security and risk management, asset security, security operations, identity and access management (IAM), security assessment and testing and security architecture and engineering. You’ll need at least five years of cumulative, paid work experience in two or more of the eight domains included in the (ISC)² CISSP Common Body of Knowledge (CBK). You may be able to satisfy one year of experience with a relevant four-year college degree or if you hold an approved credential. Average annual salary: $114,293 CGEIT Certification most in-demand certifications Take Your ISACA Certification Exam Virtually With Our New Remote Proctoring. ISACA Has Made Major Updates To The CGEIT Job Practice For 2020/2021. Register Online. Registration Open. Steps: Prepare For The Exam, Take And Pass The Exam, Apply To Get Certified. What is CGEIT? Become CGEIT Certified. Prepare for CGEIT Exam. CGEIT Certification. Topics related to Top & Most it certifications in demand today most in-demand certifications 2021/2022best it certifications for beginnersthe 10 highest-paying it certifications for 2020/2021best non it certificationstop business certifications 2021top it certifications 2021best certifications for jobsbusiness certifications worth getting](https://hybridcloudtech.com/wp-content/uploads/2021/01/Most-in-Demand-IT-Certifications-for-Beginners-Pros-100x70.png "Most in-Demand IT Certifications for Beginners & Pros")
