Cloud I - Introduction
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1 Cloud I - Introduction
2 Chesapeake Node.js User Group (CNUG)
3 START BUILDING: CALLFORCODE.ORG 3
4 Agenda Cloud Offerings ( Cloud 1.0 ) Infrastructure as a Service (IaaS) Platform as a Service (PaaS) Software as a Service (SaaS) Cloud (Linux) Runtime Stack ( Cloud 2.0 ) Docker (Containers) Kubernetes (Container Management) Helm (Kubernetes Packaging) Istio (Services Mesh) Core Cloud Concepts Location Independence Dynamic Scaling
5 Cloud Offerings Remote Facilities Bare Metal IaaS + OS PaaS + Network + Storage + Compute + DB & Mgmt + Middleware + App Hosting SaaS + Application
6 Bare Metal, IaaS, and PaaS Offerings Remote Computing is NOT new! First Generation Computing (1950s 1960s) Timesharing (now called IaaS or PaaS) Second & Third Generation Computing (1970s 2000s) Remote Sites (typical Disaster Recovery solution) Passive PaaS Global Cloud Market Market size could reach $100 Billion by 2020 Market Share Amazon (32%), Microsoft (13%), IBM (7%), Google (6%) IBM Offering is IBM Cloud (fka SoftLayer) Market evolving towards SaaS model
7 Hybrid Offerings Public Cloud Service Providers Services Amazon, Microsoft, IBM, Google Provider provisions and manages Service provided Bare Metal, IaaS, PaaS, SaaS Increasing number of PaaS, and SaaS options Provisioning Public (Shared infrastructure) Dedicated (Isolated & Dedicated infrastructure) Private Cloud Run Cloud Software Stack ( 2.0 ) On-premises IBM Private Cloud (IPC)
8 Cloud 2.0 Software Stack - Docker Developed by Solomon Hykes Released in 2013 Uses Linux features cgroups Namespaces Union file system Union file system Open Source Open Container Initiative Cloud Native Computing Foundation
9 Docker Overview (1) Conceptual Framework Software executes in Containers Containers are based upon native Linux capabilities A Container is a single isolated & encapsulated thread Everything necessary to execute (i.e. libraries) A Container is a run-time instance of an Image Images stored in Docker registries Containers are managed by a daemon dockerd (Docker container daemon) containerd (Open Source container daemon) Container isolated from all other non-kernel processes Scope of daemon is only server wide
10 Docker Overview (2) Virtual Machines versus Containers Virtual Machines Implement a virtual Operating System General purpose Multi-threaded Shared resources for multiple processes Slow to start up and shut down Containers Implement a virtual Thread Execute a single program Single-threaded (Single Linux thread) Resources dedicated to the software image Extremely fast to start up and shut down
11 Cloud 2.0 Software Stack - Kubernetes Developed by Google Released in 2015 Turned over to the Cloud Native Computing Foundation (CNCF) Clustering for Containers Docker Swarm and Apache Mesos are competing products
12 Kubernetes Overview Container Orchestration Cluster Management Container Scheduling Service Discovery Dynamic Scaling (Managing Container instances) Health Maintenance (Health Checking & Repair) Single Docker instance only spans one server Kubernetes deploys Pods of Containers Pods contain one or more containers Pod instances deployed across multiple servers Number of Pod instances monitored and managed
13 Kubernetes Architecture Kubernetes Cluster defined by Master node. Pods distributed across Worker nodes. Client control interface. Defined Pods and Services.
14 Cloud 2.0 Software Stack - Helm Developed at Deis Released in 2015 Packaging for Kubernetes Turned over to the Cloud Native Computing Foundation (CNCF) Initial development started with a short Deis hackathon
15 Helm Overview Package Manager for Kubernetes Provides Helm Charts A Helm Chart is a zipped directory (chart name = directory) Package multiple Kubernetes components into one chart o o o o Pods Services Ingress Volumes Separate Manifest data from Environment data Charts can be stored and versioned in a repository A Release is an instance of a Chart Simplifies managing deployments Combines multiple Kubernetes actions into a single chart Creates a single reusable set of deployed objects (manifest) Isolates Environment settings for simplified deployment migration (e.g. from Development to Production)
16 Helm Chart Directory Structure Helm Chart Directory Chart.yaml (Chart metadata; YAML format) LICENSE (L) - optional README.md (Text file formatted using Markdown) - optional templates (Resource manifests; Directory) o NOTES.txt (Text file) o _helpers.tpl (Text file) o configmap.yaml (YAML file) o deployment.yaml (YAML file) o pvc.yaml (YAML file) o secrets.yaml (YAML file) o svc.yaml (YAML file) values.yaml (Release Keys and Values; YAML format)
17 Helm Architecture
18 Helm Hooks Custom processing during life cycle events. Hooks are standard manifest YAML files. Declared as annotations in manifest metadata. annotations: helm.sh/hook : pre-install helm.sh/hook-weight : -5 helm.sh/hook-delete-policy : hook-succeeded
19 Cloud 2.0 Software Stack - Istio Developed by IBM, Google, & Lyft Released in 2017 Service Discovery ( Dynamic DNS ) for the Cloud Consolidation of the Amalgam8 (IBM), Service Control (Google), and Envoy Proxy (Lyft) projects
20 Istio Overview The Problem: How can the location of a Service be determined? The Answer: A Service Mesh Envoy Proxies are added as sidecars to Docker containers These sidecars are deployed as part of the Kubernetes Pod TCP requests routed through the Proxies. Proxies announce their existence to the Control Plane o This allows them to receive inbound traffic Proxies route their requests through the Control Plane o This allows them to receive inbound traffic Control Plane may also enforce Policies (Security, Traffic, etc.)
21 Istio Architecture
22 Cloud 2.0 Software Stack NoSQL DB Term introduced 2009 Refer to the newest generation of databases natively designed for Cloud Cloud requirements Horizontal scaling Dynamic Massive in scope Trade-Offs Not transactional (XA) Lack ACID properties
23 NoSQL Database Overview Many products, many different features Document Databases Cloudant (logo on right), CouchDB, MongoDB Store structured data (typically in JSON format) Key/Value Databases Memcached, Redis Store individual Values referenced by Keys State of the Art in the 1960s CAP Theorem Distributed Databases can only have two of three properties: o Consistency (Each read retrieves the most current data) o Availability (Each CRUD request is honored) o Partition Tolerance (No effect from delay or loss of data)
24 Cloud 2.0 Software Stack - Microservices Term defined in 2011 A reaction to the general misunderstanding of SOA principles No new concepts (Loose coupling, High cohesion, KISS) Concepts applied to new environment (containers).
25 Microservices Overview Software designed to run in containers Designed for dynamic scaling (horizontally) Designed for dynamic deployment (servers) Cloud based Languages and Run-times Cloud Native Computing Foundation (CNCF) Design Methodologies 12 Factor Reactive Programming Languages Liberty (Java) Node.js (JavaScript) Go Runtime (Go)
26 What s Really Different in the Cloud? (1) Software as a Service (SaaS) The world really IS heading in this direction Major examples: Salesforce Amazon Web Services (AWS) IBM Products: All major IBM products will run in multiple cloud environments IBM Cloud, ICP, AWS, Azure, Location Independence Software will be deployed to multiple locations On-premises across multiple data centers Across multiple Cloud providers Across multiple Cloud instances Software will execute on multiple servers
27 What s Really Different in the Cloud? (2) Scaling Containers are VERY lightweight A LinuxOne can launch tens of thousands containers/sec A LinuxOne can support over one million light containers Containers are quickly created and destroyed Container locations can thus be extremely dynamic Container start up/shut down times measured microseconds Entirely New Application Environment Deployed in containers Developed in new languages and runtimes Go, JavaScript (Node.js), Node-RED Use new Databases & Filesystems NoSQL
28 Questions?
29
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