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Andrii Sh., DevOps Engineer

Cherkasy, Ukraine
Last Updated: 4 Jul 2023

- 24 years of professional expertise in the IT industry; - 2+ years of work experience with Kubernetes; - 6+ years of experience with Docker; - Solid skills in working with AWS Cloud Platform; - Experience with blockchain projects on Ethereum and Polkadot; - Deep knowledge of building and supporting monitoring and alerting systems using Grafana and Prometheus; - Good understanding of work with Terraform. - Skilled in designing, building, and improvement of the IT infrastructure; - Experienced in the implementation of solutions on Microsoft\ Apple \ and Unix platforms - Deep understanding of building virtual and cloud environments; - Experience in building corporate backup systems;

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Kubernetes (K8s)

Kubernetes (K8s)

Amazon Web Services (AWS)

Amazon Web Services (AWS)

DevOps

DevOps

Python

Python

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Roman F., PHP Engineer

Turkey
Last Updated: 5 Mar 2024
Language Verified
Programming Skills Verified

- Experienced Software Engineer with 8 years of commercial experience in demanding environments, focused on producing cutting-edge systems for businesses. - Skilled in infrastructure cost optimization, Kubernetes, and Terraform. - Proficient in PHP, JavaScript, Golang, and various databases such as MySQL, PostgreSQL, and MongoDB. - Extensive experience with Amazon Web Services (AWS) and containerization technologies like Docker. - Strong background in computer science with a Master's degree in Computer Science. - Familiar with Agile and Scrum methodologies, as well as software development practices and SDLC. - Excellent communication skills and fluent in Ukrainian with advanced English proficiency.

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PHP

PHP

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Serg K., QA Engineer with QA Automation Engineer, Data Quality

Lviv, Ukraine
Last Updated: 4 Jul 2023
Identity Verified
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Programming Skills Verified
CV Verified

- 5 years with QA automation - Strong testing theory understanding. Defect life cycle and issue workflow understanding, Experience in creating and executing test cases. Reporting - Experience with data and BI tools - DevOps experience with CI/CD, pipelines, Docker, AWS, SQL

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QA Automation

QA Automation   5 yr.

Python

Python

CI/CD

CI/CD

Amazon Web Services (AWS)

Amazon Web Services (AWS)

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Mykhaylo R., DevOps/SRE/Lead System Administrator

Ukraine
Last Updated: 19 Mar 2024
Identity Verified
Language Verified
Programming Skills Verified
CV Verified

- Over 20 years in IT with a master's degree in Cybernetics - Proficient in Ansible: Extensive experience in deploying and managing Ansible-driven infrastructure, particularly highlighted in roles as SRE/Architect (Aug 2018 – Present) and Senior DevOps Engineer/Lead Sysadmin (Aug 2020 – May 2021), where Ansible was pivotal in scaling a learning platform from 1,000 to over 100,000 students and in key migration projects. - Expertise in Windows Environments: Demonstrated strong skills in managing Windows environments, especially as an SRE/Architect (Aug 2018 – Present) and CTO (2013 – Mar 2022), involving Windows AD+MSSQL backoffice management and ITIL Service Management framework implementation on Windows platforms. - Versatile IT Roles with Ansible and Windows: Across various roles including IT Service Manager, Senior DevOps Engineer, and CTO, consistently applied Ansible and Windows technologies in large-scale infrastructure projects and day-to-day operations, showing versatility and depth in these areas. - Managing the growth of the learning platform from 1,000+ to 100k+ active students - ITIL v3 Foundations Certificate - More than 5 years of experience in leading ITIL Service Management capability and implementing end-to-end ITIL Service Management framework - Strong experience in using ServiceNow and Jira Service Desk for ITSM - Experienced IT/Telecom Specialist - UNIX and UNIX-Like OS (FreeBSD, Linux, SunOS, MacOS X) background - Over 20 years of Windows/windows server family. From NT4.0 /win3.1 up to Server2019. As well as upgrading Up to 15 years with server HW, and 13 years with storage solutions - Infrastructure problem-solver with a strong view on reliability, performance, and disaster recovery - Fluent English

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Bash

Bash   10 yr.

Shell Scripts

Shell Scripts   10 yr.

MySQL

MySQL   10 yr.

Ansible

Ansible

Ansible Playbook

Ansible Playbook

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Oleg A., PHP Backend Engineer

Gdansk, Poland
Last Updated: 2 Apr 2024
Language Verified
Programming Skills Verified
CV Verified

- 11+ years of experience in web development and 4 years of experience in the Fintech domain. - Proficient in various PHP frameworks such as YII2, Laravel and Symfony. - Experienced in front-end technologies including HTML5, CSS3, SASS, LESS, and JavaScript. - Strong knowledge of APIs and integrating payment gateways (Crypto, APM, S2S). - Expertise in designing and developing secure web applications. - Familiarity with AWS, Microsoft Azure, and other cloud infrastructure management. - Proven track record of successfully delivering projects on time and within budget, receiving commendations for technical prowess, innovative solutions, and team collaboration. - Location: Poland - Available: ASAP

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PHP

PHP

Amazon Web Services (AWS)

Amazon Web Services (AWS)

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Table of Contents

Soft skills of a Docker Developer

Soft skills are essential for Docker Developers as they not only need to have technical expertise but also need to effectively communicate and collaborate with teams. Here are the soft skills required for Docker Developers at different levels:

Junior

  • Communication: Ability to effectively communicate with team members, understand requirements, and provide updates on progress.
  • Problem Solving: Strong problem-solving skills to troubleshoot issues and find solutions.
  • Adaptability: Willingness to learn and adapt to new technologies and tools.
  • Teamwork: Ability to work collaboratively in a team environment and contribute to the success of the project.
  • Time Management: Efficiently managing time and meeting deadlines.

Middle

  • Leadership: Demonstrating leadership skills and taking ownership of tasks.
  • Critical Thinking: Analyzing complex problems and making informed decisions.
  • Mentoring: Guiding and mentoring junior team members.
  • Effective Documentation: Documenting processes, configurations, and troubleshooting steps.
  • Conflict Resolution: Resolving conflicts within the team and finding win-win solutions.
  • Collaboration: Working closely with cross-functional teams and stakeholders.
  • Project Management: Managing and prioritizing tasks and resources.

Senior

  • Strategic Thinking: Identifying long-term goals and developing strategies to achieve them.
  • Client Management: Building and maintaining strong relationships with clients.
  • Presentation Skills: Delivering clear and impactful presentations to stakeholders.
  • Decision-making: Making informed decisions based on data and analysis.
  • Innovation: Bringing innovative ideas and solutions to the table.
  • Empathy: Understanding and empathizing with team members and stakeholders.
  • Negotiation: Negotiating contracts, budgets, and timelines.
  • Conflict Management: Resolving conflicts at a higher level and maintaining a positive work environment.

Expert/Team Lead

  • Strategic Planning: Developing long-term plans and roadmaps for projects.
  • Project Management: Overseeing the execution and delivery of multiple projects.
  • Team Management: Leading and mentoring a team of developers.
  • Business Acumen: Understanding the business goals and aligning technical efforts accordingly.
  • Decision-making: Making critical decisions that impact the overall project success.
  • Communication: Effectively communicating with stakeholders at all levels.
  • Collaboration: Building strong partnerships with other teams and departments.
  • Continuous Learning: Keeping up-to-date with the latest technologies and industry trends.
  • Quality Assurance: Ensuring high-quality deliverables through rigorous testing and review processes.
  • Risk Management: Identifying and mitigating risks throughout the project lifecycle.
  • Team Motivation: Inspiring and motivating the team to achieve their best performance.

Cases when Docker does not work

  1. Docker does not work when the host system does not meet the minimum requirements. Docker requires a 64-bit version of Linux, Windows, or macOS with virtualization capabilities enabled. If the host system does not fulfill these requirements, Docker may not work properly.
  2. Docker may not work if the system has conflicting software. Some antivirus or security software can interfere with Docker’s operation by blocking network connections or modifying system settings. Additionally, other virtualization platforms like VirtualBox may conflict with Docker’s virtualization components, causing issues.
  3. If the Docker daemon is not running or encounters errors during startup, Docker will not work as expected. Issues with the daemon can occur due to misconfigurations, resource limitations, or conflicts with other applications running on the system.
  4. Insufficient system resources can also prevent Docker from working efficiently. Docker heavily relies on CPU, memory, and disk I/O. If the host system does not have enough resources available, Docker containers may experience performance degradation or fail to start altogether.
  5. Networking problems can hinder Docker’s functionality. If the network configuration is incorrect or if there are issues with DNS resolution or firewall settings, containers may not be able to communicate with each other or the outside world, impacting Docker’s overall functionality.
  6. Issues with Docker images can also cause problems. If the images are corrupt, improperly built, or incompatible with the host system, Docker may not be able to run containers using those images.
  7. Compatibility issues between Docker and the operating system can lead to Docker not working as expected. Certain Linux distributions may have different kernel versions or configurations, which can result in compatibility issues with Docker.
  8. Problems with Docker volumes can hinder the proper functioning of containers. If there are issues with volume mounts, such as incorrect permissions or unavailable storage, Docker containers may fail to start or experience data loss.
  9. Docker may not work if there are problems with the Dockerfile or the build process. Errors in the Dockerfile syntax or missing dependencies can prevent Docker images from being built correctly, resulting in non-functional containers.
  10. In some cases, Docker may not work due to bugs or issues in the Docker software itself. Although Docker is a widely used and well-maintained platform, occasional bugs or compatibility problems can arise, which may affect Docker’s functionality.

What are top Docker instruments and tools?

  • Docker Compose: Docker Compose is a tool that allows you to define and manage multi-container Docker applications. It uses a YAML file to configure the services, networks, and volumes required for your application, making it easy to spin up and tear down complex environments. Docker Compose was first released in 2013 and has since become a popular choice for orchestrating Docker containers.
  • Kubernetes: Kubernetes is an open-source container orchestration platform that was originally developed by Google. It provides a framework for automating the deployment, scaling, and management of containerized applications. Kubernetes has gained significant traction since its initial release in 2014 and is widely used in production environments to manage Docker containers at scale.
  • Docker Swarm: Docker Swarm is a native clustering and orchestration solution for Docker. It allows you to create and manage a swarm of Docker nodes, providing high availability and fault tolerance for your containers. Docker Swarm was introduced in 2014 as part of the Docker 1.12 release, and while it may not have the same level of adoption as Kubernetes, it remains a popular choice for those looking for a simpler and more lightweight orchestration solution.
  • Docker Registry: Docker Registry is a storage and distribution system for Docker images. It allows you to store and share your Docker images, making it easy to deploy them to different environments. The most well-known implementation of Docker Registry is Docker Hub, which is a public registry that hosts a vast number of Docker images contributed by the community. Docker Registry was introduced in 2013 and has played a crucial role in the popularity and adoption of Docker.
  • Docker Security Scanning: Docker Security Scanning is a tool that provides vulnerability scanning for Docker images. It analyzes the contents of your images and alerts you to any known security vulnerabilities. Docker Security Scanning was launched in 2016 as a collaboration between Docker and Vulnerability Labs, with the goal of helping developers and operators identify potential security risks in their Docker deployments.

Hard skills of a Docker Developer

Hard skills of a Docker Developer:

Junior

  • Docker Fundamentals: Understanding the core concepts and features of Docker, such as containers, images, and Dockerfile.
  • Containerization: Ability to containerize applications using Docker, ensuring efficient deployment and scalability.
  • Docker Compose: Knowledge of Docker Compose to define and manage multi-container Docker applications.
  • Docker Networking: Familiarity with Docker networking concepts, including creating and managing networks for container communication.
  • Docker Volumes: Understanding how to use Docker volumes for persistent data storage in containers.

Middle

  • Docker Orchestration: Proficiency in Docker orchestration tools like Docker Swarm or Kubernetes for managing and scaling containerized applications across multiple hosts.
  • Docker Security: Knowledge of Docker security best practices, including securing container images, network traffic, and host environments.
  • Docker Registry: Experience working with Docker registries to store and distribute container images.
  • Docker Monitoring: Familiarity with monitoring tools and techniques for tracking Docker container performance and resource usage.
  • Docker Troubleshooting: Ability to diagnose and resolve common issues that may arise during Docker deployment and container management.
  • Containerization Patterns: Understanding different containerization patterns and when to apply them for optimal application performance and scalability.
  • CI/CD Integration: Experience integrating Docker into continuous integration and continuous deployment (CI/CD) pipelines for automated application delivery.

Senior

  • Advanced Docker Networking: In-depth knowledge of Docker networking configurations, including overlay networks, service discovery, and load balancing.
  • Container Orchestration: Expertise in container orchestration platforms like Kubernetes, including advanced features like auto-scaling, rolling updates, and stateful applications.
  • Docker Storage Drivers: Understanding different Docker storage drivers and their performance characteristics, such as overlay, aufs, and zfs.
  • Container Security: Proficiency in securing Docker containers at runtime by implementing security policies, container isolation, and vulnerability scanning.
  • Infrastructure as Code: Experience using tools like Terraform or Ansible to define and provision Docker infrastructure as code.
  • Docker Enterprise Edition: Knowledge of Docker Enterprise Edition (EE) features and capabilities for managing large-scale container environments.
  • Performance Optimization: Ability to optimize Docker container performance through resource tuning, container sizing, and utilization monitoring.
  • High Availability: Understanding how to design and implement highly available Docker architectures for fault tolerance and disaster recovery.

Expert/Team Lead

  • Advanced Container Networking: Mastery of advanced container networking concepts, including service mesh architectures, network overlays, and load balancing algorithms.
  • Containerization Strategy: Ability to design and implement containerization strategies for complex enterprise environments, including legacy application modernization.
  • Containerization Governance: Experience establishing governance frameworks and policies for containerized applications, including security, compliance, and risk management.
  • Container Orchestration Platforms: Extensive knowledge of various container orchestration platforms like Kubernetes, Docker Swarm, and Mesos, and their trade-offs.
  • Containerization Performance Engineering: Expertise in performance engineering techniques for containerized applications, including benchmarking, profiling, and optimization.
  • Cloud-Native Architecture: Understanding how to design and build cloud-native architectures using Docker and other cloud-native technologies.
  • Microservices: Proficiency in designing and implementing microservices architectures using Docker containers and related technologies.
  • DevOps Leadership: Ability to lead and mentor teams in implementing DevOps practices and principles using Docker and containerization.
  • Containerization Automation: Experience automating container deployment, scaling, and management using tools like Jenkins, GitLab, or Ansible.
  • Containerization Strategy: Ability to provide strategic guidance and consulting on containerization initiatives, aligning them with business objectives and technology roadmaps.
  • Containerization Training and Education: Experience developing and delivering training programs and workshops on Docker and containerization for technical teams.

TOP 10 Docker Related Technologies

  • Programming Languages

    Docker software development supports a wide range of programming languages such as Python, JavaScript, Java, Go, and Ruby. These languages offer robust and scalable solutions for building Docker containers and applications.

  • Docker Engine

    Docker Engine is the foundation of Docker software development. It enables the creation, deployment, and management of containers. It provides a lightweight and portable runtime environment for applications, making it easier to develop and deploy software using Docker.

  • Docker Compose

    Docker Compose is a tool for defining and running multi-container Docker applications. It allows developers to define a set of services, networks, and volumes in a single YAML file, making it easier to manage complex Docker deployments.

  • Kubernetes

    Kubernetes is a popular container orchestration platform that works well with Docker. It allows developers to automate the deployment, scaling, and management of containerized applications. Kubernetes provides advanced features like load balancing, service discovery, and rolling updates.

  • Continuous Integration/Continuous Deployment (CI/CD) Tools

    CI/CD tools such as Jenkins, GitLab CI/CD, and CircleCI integrate seamlessly with Docker. They enable developers to automate the testing, building, and deployment of Docker containers, ensuring a smooth and efficient software development process.

  • Container Registries

    Container registries like Docker Hub, Google Container Registry, and Amazon Elastic Container Registry are essential for storing and distributing Docker images. These registries provide a centralized location for developers to share and access containerized applications and libraries.

  • Monitoring and Logging Tools

    Tools like Prometheus, Grafana, and ELK (Elasticsearch, Logstash, and Kibana) are commonly used for monitoring and logging Docker applications. They help developers track the performance, health, and logs of containers, ensuring optimal application performance and troubleshooting.

Pros & cons of Docker

9 Pros of Docker

  • Efficiency: Docker containers are lightweight and use fewer resources compared to traditional virtualization methods, resulting in higher efficiency and better performance.
  • Isolation: Docker provides a high level of isolation, ensuring that applications and their dependencies are encapsulated within a container. This eliminates potential conflicts between applications and improves security.
  • Portability: Docker containers can run on any system that supports Docker, making it easy to deploy applications across different environments, from development to production.
  • Scalability: Docker allows for easy scaling of applications by quickly spinning up multiple containers and distributing the workload efficiently.
  • Version control: Docker enables versioning of containers, making it easier to roll back to a previous version if needed. This simplifies the process of testing and deploying new updates.
  • Continuous Integration/Continuous Deployment (CI/CD): Docker integrates seamlessly with CI/CD pipelines, enabling automated testing, building, and deployment of applications.
  • Collaboration: Docker simplifies collaboration among developers by providing a consistent environment for development, making it easier to share projects and reproduce the same results across different systems.
  • Manageability: Docker provides powerful tools for managing containers, such as Docker Compose and Docker Swarm, which make it easier to orchestrate and manage containerized applications.
  • Ecosystem: Docker has a large and active community, with a vast ecosystem of pre-built containers and tools available, providing developers with a wide range of options and resources.

9 Cons of Docker

  • Learning curve: Docker has a steep learning curve, especially for users who are new to containerization and container orchestration.
  • Security concerns: While Docker provides isolation, there is still a risk of security vulnerabilities if containers are not properly configured or if malicious code is injected into containers.
  • Complex networking: Networking in Docker can be complex, especially when dealing with multiple containers and connecting them to external networks.
  • Resource overhead: Although Docker containers are lightweight compared to traditional virtual machines, there is still some resource overhead associated with running multiple containers.
  • Compatibility issues: Docker containers may have compatibility issues when running on different operating systems or versions, requiring additional configuration and testing.
  • Container sprawl: Without proper management, Docker containers can quickly multiply and become difficult to manage, leading to container sprawl and increased resource consumption.
  • Persistence: By default, Docker containers are designed to be stateless, which can pose challenges for applications that require persistent storage or data.
  • Limited Windows support: While Docker has expanded its support for Windows, it still has limitations compared to its native support on Linux systems.
  • Dependency management: Managing dependencies within Docker containers can be challenging, especially when dealing with complex applications with multiple dependencies.

TOP 15 Tech facts and history of creation and versions about Docker Development

  • Docker is an open-source platform that revolutionized software development and deployment by introducing containerization methodology.
  • It was created in 2013 by Solomon Hykes, a French entrepreneur and software engineer.
  • Docker quickly gained popularity due to its ability to package applications and their dependencies into portable containers.
  • The first version of Docker, known as Docker Engine, was released in March 2013.
  • In 2014, Docker received $15 million in funding and attracted the attention of major tech companies like Google and Red Hat.
  • Docker containers are lightweight, providing faster startup times and improved resource utilization compared to traditional virtual machines.
  • With Docker, developers can build, ship, and run applications consistently across different environments, such as development, testing, and production.
  • The Docker Hub, a cloud-based registry, was launched in 2014, allowing developers to share and discover containerized applications.
  • Docker Swarm, introduced in 2015, enabled the orchestration of multiple Docker hosts to form a cluster for scaling and load balancing.
  • In 2016, Docker introduced Docker Datacenter, an integrated platform for managing and orchestrating containerized applications at scale.
  • Docker has a vast ecosystem of third-party tools and services that extend its capabilities, including Kubernetes, Jenkins, and Prometheus.
  • In 2017, Docker announced support for Kubernetes, a popular container orchestration platform, further expanding its reach.
  • Docker images are versioned using tags, allowing developers to track and manage different versions of their applications.
  • Docker Compose, introduced in 2013, enables the definition and orchestration of multi-container applications using a simple YAML file.
  • Docker has been widely adopted by organizations of all sizes, including major enterprises like PayPal, Visa, and Spotify.

How and where is Docker used?

Case NameCase Description
Microservices DeploymentDocker allows developers to package each individual component of an application as a microservice, making it easier to deploy, scale, and manage. This approach enables faster development cycles, as each microservice can be updated independently without affecting the entire application.
Continuous Integration and Continuous Deployment (CI/CD)Docker provides a consistent environment for building, testing, and deploying applications. With Docker, developers can create reproducible build environments, enabling seamless integration and deployment pipelines. This streamlines the development process and ensures that software can be delivered rapidly and reliably.
DevOps CollaborationDocker promotes collaboration between developers and operations teams by providing a common platform for building, shipping, and running applications. It bridges the gap between development and operations, allowing for smoother communication and faster feedback loops.
Application IsolationDocker uses containerization to isolate applications from the underlying infrastructure. This isolation ensures that applications run consistently across different environments, reducing the risk of compatibility issues and dependencies conflicts. Developers can package their applications with all the necessary dependencies, ensuring portability and eliminating the “it works on my machine” problem.
Hybrid Cloud DeploymentsDocker simplifies the deployment of applications in hybrid cloud environments. Developers can create container images that can run on different cloud providers or on-premises infrastructure without modification. This flexibility allows for easier migration, scalability, and management of applications across diverse cloud environments.
Resource OptimizationDocker enables efficient utilization of hardware resources by allowing multiple containers to run on a single host. Containers share the host’s operating system kernel, reducing the overhead of running multiple virtual machines. This results in improved resource efficiency and cost savings for organizations.
Testing and QA EnvironmentsDocker simplifies the creation and management of testing and QA environments. Developers can create containers with specific configurations and dependencies for testing purposes, ensuring consistent and reproducible test results. This accelerates the testing process and helps identify and resolve issues early in the development cycle.
Scalability and ElasticityDocker enables easy scaling of applications by allowing developers to replicate and distribute containers across multiple hosts. This scalability and elasticity make it possible to handle varying levels of traffic and demand, ensuring optimal performance and responsiveness.
Legacy Application ModernizationDocker allows organizations to modernize their legacy applications by containerizing them. By encapsulating legacy applications within containers, organizations can take advantage of the benefits of containerization, such as portability, scalability, and easier management. This approach avoids the need for a complete application rewrite and allows for incremental modernization.

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