2. WHO AM I ?
MCSA : Cloud Platform, MCSE, MCT, AWS SAA/Dev/SysOps
Work as Technical Consultant
4+ Experience in Cloud & Server Technology
OMS, SCOM, AWS, Azure & Windows Server
Twitter : @kasunsjc
LinkedIn : http://www.linkedin.com/in/kasunraj
3. WHAT IS CONTAINERS?
• Compared to VMs, containers are much more lightweight
• A container, on the other hand, is nothing more than a single isolated
process running in the host OS, consuming only the resources that the
app consumes and without the overhead of any additional processes
• Containers, on the other hand, all perform system calls on the exact same
kernel running in the host OS.
• This single kernel is the only one performing x86 instructions on the
5. WHAT IS DOCKER?
• Command line program and background deamon
• Computer program that performs operating-system-level virtualization Running software in
containers for isolation
• Resource isolation features of the Linux kernel such as cgroups and kernel namespaces, and a
union-capable file system such as OverlayFS and others
• Provides a set of infrastructure components that simplify distributing Docker images
6. WHAT IS KUBERNETES (K8S)
• It’s originally developed by Google for there internal purpose.
• In 2014 Google introduced Kubernetes, an open-source system based
on the experience gained through Borg, Omega, and other internal
• software system that allows you to easily deploy and manage
containerized applications on top of it.
• Helping developers focus on the core app features.
• Helping ops teams achieve better resource utilization.
8. AZURE KUBERNETES SERVICE (AKS)
• It’s a managed service provide by Azure.
• Easy to get start with enterprise scale container environment in
• Can integrate with CI/CD and Source control
• Taking away the management of master node (Managed)
• Automated Kubernetes version upgrades and patching
• Easy cluster scaling
• Self-healing hosted control plane (masters)
• Cost savings - pay only for running agent pool nodes
11. USAGE AND ADVANTAGE OF USING KUBERNETES
• Moving from monolithic apps to microservices
• Providing a consistent environment to applications
• Moving to continuous delivery: DevOps and NoOps
• Automatic binpacking
• Horizontal scaling
• Service discovery and load balancing
• Automated rollouts and rollback
• Secret and configuration management
• Storage orchestration
• Batch execution
• Co-located group of containers and represents the basic building block in
• It’s common for pods to contain only a single container.
• A pod of containers allows you to run closely related processes together and provide
them with (almost) the same environment as if they were all running in a single
container, while keeping them somewhat isolated. This way, you get the best of both
14. REPLICA SETS/REPLICACONTROLER
• Kubernetes resource that ensures its pods are always kept running.
• It makes sure a pod (or multiple pod replicas) is always running by starting a new
pod when an existing one goes missing.
• When a cluster node fails, it creates replacement replicas for all the pods that were
running on the failed node (those that were under the Replication-Controller’s
• It enables easy horizontal scaling of pods—both manual and automatic
• Uses Label selector to select pods.
• A resource you create to make a single, constant point of entry to a group of pods
providing the same service.
• Each service has an IP address and port that never change while the service exists.
• External clients need to connect to the frontend pods without caring if there’s only a
single web server or hundreds.
• The frontend pods need to connect to the backend database. Because the database
runs inside a pod, it may be moved around the cluster over time, causing its IP
address to change. You don’t want to reconfigure the frontend pods every time the
backend database is moved.
20. MONITORING KUBERNETES SERVICE
• By the recent enhansment and announcement of container team we can monitor k8
nodes & different resources from azure portal.
• We can use Operation Management Suite (OMS) container solution.
• Using third party container monitoring tools. Eg :- cAdvisor, InfluxDB and Grafana
• For the full list of compatible monitoring tools follow below link