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% Document Info
\author{Gaurav Pandey (gauravpandey44)}
\pdfinfo{
  /Title (kubernetes-k8s.pdf)
  /Creator (Cheatography)
  /Author (Gaurav Pandey (gauravpandey44))
  /Subject (Kubernetes (k8s) Cheat Sheet)
}

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\noindent
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    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Kubernetes (k8s) Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Gaurav Pandey (gauravpandey44)} via \textcolor{DarkBackground}{\uline{cheatography.com/69622/cs/20652/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Gaurav Pandey (gauravpandey44) \\
  \uline{cheatography.com/gauravpandey44} \\
  \end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 30th September, 2019.\\
   Updated 1st October, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{document}
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Basics}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Define}} :it is a container management technology developed by GOOGLE (later made open source in 2015) to manage containerized \seqsplit{application(orchestration)}.% Row Count 4 (+ 4)
} \tn 
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\begin{tabularx}{8.4cm}{x{4.48 cm} x{3.52 cm} }
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\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Why}}  \tn
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1.Service discovery and load balancing 1.Service discovery and load balancing & 2.Automated rollbacks \tn 
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% Row 1
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3.Self-healing & 4.Auto Scaling \tn 
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5.Canary updates and Rolling updates & 6.Open source \& Community driven \tn 
% Row Count 7 (+ 2)
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\mymulticolumn{2}{x{8.4cm}}{7.High Availability} \tn 
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\begin{tabularx}{8.4cm}{x{3.36 cm} x{4.64 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Kubernetes Concepts}}  \tn
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Node & machine in the cluster \tn 
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Docker & helps in creation of containers that includes apps and its binaries. \tn 
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Pods & A Pod is the basic building block of Kubernetes–the smallest and simplest unit in the Kubernetes object model that you create or deploy,is also a group of containers (1 or more).Only containers of same pod can share shared storage. \tn 
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Service & is an abstraction which defines a logical set of Pods and a policy by which to access them. \tn 
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Jobs & Creates pod(s) and ensures that a specified number successfully completed.When a specified number of successful run of pods is completed, then the job is considered complete. \tn 
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Cronjob & job scheduler in K8s \tn 
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Replicasets & ensures how many replica of pod should be running. \tn 
% Row Count 32 (+ 3)
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\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Kubernetes Concepts (cont)}}  \tn
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Namespaces & Logical seperation between teams and thier environments.It allows various teams(Dev,Prod) to share k8s cluster by providing isolated workspace. \tn 
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Deployment & Desired state of pods for declarative updates \tn 
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daemonset & ensures a particular pod to be run on some or all nodes \tn 
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\seqsplit{persistentvolume} & Persistent storage in the cluster with an independent lifecycle. \tn 
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\seqsplit{persistentvolumeclaim} & Request for storage (for a PersistentVolume) by a user \tn 
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ingress & An Ingress is a collection of rules that allow inbound connections to reach the cluster services. \tn 
% Row Count 24 (+ 5)
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\begin{tabularx}{8.4cm}{x{3.6 cm} x{4.4 cm} }
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\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Namespaces}}  \tn
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kubectl get all -{}-all-namespaces & shows all objects of all namespaces \tn 
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kubectl get pods -{}-all-namespaces & shows pods of all namespaces \tn 
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kubectl get pods -n \textless{}name space\textgreater{} & shows  pods of a namespace eg.kubectl get all -n kube-system :shows objects of system name space \tn 
% Row Count 9 (+ 5)
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\mymulticolumn{2}{x{8.4cm}}{kubectl get namespaces (show all namspaces) \newline {\bf{default}}:default name spaces of user \newline {\bf{kube-public}}:Namespace for resources that are publicly available/readable by all \newline {\bf{kube-system}}:Namespace for objects/resources created by Kubernetes systems}  \tn 
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Components Architecture Diagram}}  \tn
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\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Components Basic}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Components in Manager Nodes}}: \newline % Row Count 1 (+ 1)
{\bf{Controller manager}}: Runs various controllers to help move running state to desired state.  \newline % Row Count 3 (+ 2)
{\emph{Node Controller}}: Responsible for noticing and responding when nodes go down. \newline % Row Count 5 (+ 2)
{\emph{Replication Controller}}: Responsible for maintaining the correct number of pods for every replication controller object in the system. \newline % Row Count 8 (+ 3)
{\emph{Endpoints Controller}}: Populates the Endpoints object (i.e, joins Services \& Pods). \newline % Row Count 10 (+ 2)
{\emph{Service Account \& Token Controllers}}: Create default accounts and API access tokens for new namespaces. \newline % Row Count 13 (+ 3)
{\bf{Scheduler}}: Watches newly created pods that have no node assigned, and selects a node for them to run on.  \newline % Row Count 16 (+ 3)
{\bf{Api Server}}:The front-end for the Kubernetes control plane. It is designed to scale horizontally.Every other component contact with this to communicate. \newline % Row Count 20 (+ 4)
{\bf{Etcd Cluster}}: key/value backing store for cluster data,it stores state of the cluster (what nodes exist in the cluster, what pods should be running, which nodes they are running on, and a whole lot more) at any given point of time. \newline % Row Count 25 (+ 5)
{\bf{Components in Worker Nodes}}: \newline % Row Count 26 (+ 1)
{\bf{Kubelet}}:Agent that continuously watches API server. It makes sure that containers are running in a pod. \newline % Row Count 29 (+ 3)
{\bf{Kube-proxy}}: a proxy service that runs on each worker node to deal with individual host subnetting and expose services to the external world. It performs request forwarding to the correct pods/containers across the various isolated networks in a cluster.% Row Count 35 (+ 6)
} \tn 
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\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Various Ways of installing K8s}}  \tn
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\seqsplit{minikube} & single node cluster \tn 
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\seqsplit{kubeadm} & multinode cluster(doesn't support kubenet, hence require CNI{[}container network interface{]} plugin eg. flannel. \tn 
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GKE & multi node \tn 
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\mymulticolumn{2}{x{8.4cm}}{Important: The network must be deployed before any applications. Also, CoreDNS will not start up before a network is installed. kubeadm only supports Container Network Interface (CNI) based networks (and does not support kubenet).}  \tn 
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\begin{tabularx}{8.4cm}{x{1.52 cm} x{6.48 cm} }
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\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Output format in get}}  \tn
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-o wide & width wise details output \tn 
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-o yaml & details output in yaml format \tn 
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-o json & details output in json format \tn 
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% That's all folks
\end{multicols*}

\end{document}