General Questions Flashcards
Development and Operations: The Problem
Development
Developers traditionally do not pay as much attention to what happens after the software application goes into a production data center. This issue creates a problem between development and operations.
Development and Operations: The Problem
Operations
Operations department often finds that it is very difficult to introduce new software because of the backlog of change requests.
Developers look at the world with a perspective that is different from Operations. Two different perspectives are:
- Development wants to release newer versions of applications and new products as fast as possible.
- Operations wants a reliable and stable environment.
Traditionally, software developers and network operations were in independent silos. Software developers focus on…
…creating features and delivering monolithic applications.
Traditionally, software developers and network operations were in independent silos. Software developers focus on creating features and delivering monolithic applications. Network operations focus on…
…enabling connectivity for the developers to deliver value
DevOps methodologies eliminate the silos between the…
…development of software and the operations of deploying and maintaining it.
An important goal of DevOps is…
…to break down silos and enhance communication between teams.
The problem lies in the fact that development and operations are often in…
…completely independent and isolated parts of an organization.
CALMS Acronym
Culture
Automation
Lean
Measurement
Sharing
[CALMS](https://ondemandelearning.cisco.com/apollo-alpha/mc_naec10_01/as
CALMS
Culture
The organization must be ready to make this type of change.
CALMS
Automation
The technology must enable faster testing and feature deployment.
CALMS
Lean
the management philosophy goal is to reduce all waste.
CALMS
Measurement
Information about ongoing operations is shared in real time.
CALMS
Sharing
DevOps units work in collaboration and are vocal when things go right or wrong.
DevOps Tools Categories
- Collaboration
- Continuous integration
- Configuration management
- Working environment
- Source and image control
- Platforms
Collaboration
Systems like Trello, Slack, Cisco Webex, Jira, and HipChat are used to enhance collaboration during the development process.
Continuous Integration
Tools such as Jenkins, Travis CI, CircleCI, TeamCity, and Visual Studio Team Services help orchestrate the overall development pipeline and offer more efficient ways for testing.
Configuration management
Tools like Puppet, Chef, SaltStack, Terraform, and Ansible are often used for configuration management to ensure that when an application is deployed, it follows the approved and template-defined configuration.
Working environment
Systems that quickly allow repeatable environments to be created, such as Packer and Vagrant, or Docker, are used to simplify and accelerate development efforts.
Source and image control
Systems like GitLab, GitHub, Docker Hub, Bitbucket, and JFrog Artifacts are used where source code, or more broadly, software artifacts, are stored and pushed.
Platforms
Cloud resources like OpenStack, Google Cloud Platform, Amazon Web Services, DigitalOcean, and Microsoft Azure are platforms that can be easily consumed via APIs to build on-demand and elastic environments.
Core components of the complete device API
Data models: The foundation of the API consists of data models. Data models define the syntax and semantics, including constraints of working with the API. YANG is a data model used by NETCONF, RESTCONF, and gRPC.
Transport: Model-driven APIs support several transport methods, including SSH, TLS, and HTTP or HTTPS.
Encoding: Model-driven APIs support the choice of encoding, including XML and JSON, and custom encodings such as Google protocol buffers.
Protocols: Model-driven APIs also support multiple options for protocols, with the three core protocols being NETCONF, RESTCONF, and gRPC.
[Model-Driven Programmability in action](https://odel-assets.cisco.com/a
YANG model-driven programmability stack
Git Commands
