Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Pod is the basic unit of work It is application or service Pod is an atomic unit of scheduling in Node Kubernetes manages pod and not container Kubernetes job is to keep the pods running based on desired state State is the pod up and running Health is the application in the pod running

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now a) Kubelete Main Kubernetes agent Registers node with cluster (decide who is the master node) Watches api server Instantiates the pods ( not creating the pod) Reports back to master Expose endpoint on 10255 b) kube-proxy Manages the kubernetes networking Assigning pod IP address (indirectly) All containers in a pod share a single IP

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now a) kube-apiserver Server of Api’s Front end to the Master Node Any request from Inside or outside the kubernetes is received by API server Exposes the REST API Consumes JSON (via manifest file) b) Cluser store Persist storage for cluster state and config Uses etcd to manage c) Kube-Controller-Manager Manager/Controller of Controllers such as

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Kubernetes manages 1 to many containers Load Balancing – Manages the load balance of multiple containers running with same port in one host Auto healing Keep desired state of containers Allow to view the data center as a computer by managing all containers hosted in multiple host Container orchestration Automated Rollbacks Auto Scaling –

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Docker supports several storage drivers, using a pluggable architecture. The storage driver controls how images and containers are stored and managed on your Docker host overlay2 is the preferred storage driver for all currently supported Linux distributions, and requires no extra configuration. The legacy overlay driver was used for kernels that did not support the “multiple-lowerdir” feature

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now docker file with 2 CMD, 2 ENTRYPOINT docker file with 1 CMD, 1 ENTRYPOINT

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now https://devopsschool.com/tutorial/docker/dockerfile/dockerfile-example-sample-lab.html Docker file Example and Sample Program – 1 Docker file Example and Sample Program – 2 Docker file Example and Sample Program – 3 Docker file Example and Sample Program – 4 Docker file Example and Sample Program – 5

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM – base image to start creating the new image RUN – Run command in a container created from previous line/layer ARG – Set a variable for docker file execution and reuse using $(varname) ENV – Meta layer to set environment for the container EXPOSE – Sepcify information port for the container and also

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now root@ip-172-31-28-155:/var/lib/docker/overlay2# docker run -itd –name anoop_centos_2 centos460aebb7de8bde42112d32e5e37df7617fb8e0588a9bdccf79f47d98357cede7 [root@ip-172-31-28-155:/var/lib/docker/overlay2# docker ps | grep anoop460aebb7de8b centos “/bin/bash” 4 seconds ago Up 3 seconds anoop_centos_2 root@ip-172-31-28-155:/var/lib/docker/overlay2# docker attach 460aebb7de8b [root@460aebb7de8b /]# yum update [root@460aebb7de8b /]# yum install git [root@460aebb7de8b /]# yum install epel-release [root@460aebb7de8b /]# yum install -y ntp –> failed [root@460aebb7de8b /]# yum install httpd [root@460aebb7de8b

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now root@ip-172-31-28-155:/var/lib/docker# docker run -itd –name anoop_ubuntu_base ubuntubcba3eb8cfb3d221c9f8f753a65c86ee5ea924d8c69438342d3e83d429d572a9root@ip-172-31-28-155:/var/lib/docker# docker ps | grep anoopbcba3eb8cfb3 ubuntu “bash” 5 seconds ago Up 4 seconds anoop_ubuntu_baseroot@ip-172-31-28-155:/var/lib/docker# docker attach bcba3eb8cfb3 root@bcba3eb8cfb3:/# apt-get update root@bcba3eb8cfb3:/# apt-get install git root@bcba3eb8cfb3:/# apt-get install httpd root@bcba3eb8cfb3:/# apt-get install mini-httpd root@bcba3eb8cfb3:/# which git/usr/bin/git root@bcba3eb8cfb3:/# mini_httpdbind: Address already in use root@bcba3eb8cfb3:/# apt-get install ntpReading package lists…

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Docker image is a collection of file system (Root FS, USER FS and APP FS) One copy of Docker image get attached to each container created from the image We can create multiple containers from same image docker image made up of file system layered over each other i.e Layer-n(image n)….. –> Layer1(image 1)

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now The docker update command dynamically updates container configuration like cpu, memory etc. To specify more than one container, provide space-separated list of container names or IDs.

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 1. rabbitmq – https://hub.docker.com/_/rabbitmq 2. nginx – https://hub.docker.com/_/nginx 3. fluentd – https://hub.docker.com/_/fluentd 4. prometheus – https://hub.docker.com/r/ubuntu/prometheus 5. kibana – https://hub.docker.com/_/kibana

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now docker wait will wait for the containers to stop and then print the exit code from the container

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Docker image: Docker image is a collection of file system (Root FS, User FS and App FS). Use “docker images” command to see the docker images Docker Container: Docker container is the runnable instance of docker image. Docker container contains 1 ROOT FS, 1 PID, 1 NET and 1 USER and attach ROOT FS,

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now docker stop stops the container gracefully where as docker kill terminates the process immediately. docker stop showing status as “Exited (0)” and docker kill showing status as “Exited (137)”

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now docker pause suspend all process in the container. docker unpause unsuspend all process in the container