\documentclass{article}
\usepackage{tikz}
\usepackage[graphics,tightpage,active]{preview}
\usetikzlibrary{arrows, shadows.blur, positioning, fit, calc, backgrounds}
\usepackage{lscape}

\pagenumbering{gobble}

\PreviewEnvironment{tikzpicture}
\PreviewEnvironment{equation}
\PreviewEnvironment{equation*}
\newlength{\imagewidth}
\newlength{\imagescale}
\pagestyle{empty}
\thispagestyle{empty}

\begin{document}
\begin{center}
\begin{tikzpicture}[
  scale=0.5,transform shape,
  font=\sffamily,
  every matrix/.style={ampersand replacement=\&,column sep=2cm,row sep=2cm},
  operator/.style={draw,solid,thick,circle,fill=red!20,inner sep=.3cm, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  component/.style={draw,solid,thick,rounded corners,fill=yellow!20,inner sep=.3cm, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  border/.style={draw,dashed,rounded corners,fill=gray!20,inner sep=.3cm, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  pod/.style={draw,solid,thick,rounded corners,fill=blue!20, inner sep=.3cm, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  service/.style={draw,solid,thick,rounded corners,fill=blue!20, inner sep=.3cm, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  endpoint/.style={draw,solid,thick,rounded corners,fill=blue!20, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  secret/.style={draw,solid,thick,rounded corners,fill=blue!20, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  pvc/.style={draw,solid,thick,rounded corners,fill=blue!20, inner sep=.3cm, blur shadow={shadow blur steps=5,shadow blur extra rounding=1.3pt}},
  label/.style={rectangle,inner sep=0,outer sep=0},
  to/.style={->,>=stealth',shorten >=1pt,semithick,font=\sffamily\footnotesize},
  every node/.style={align=center}]

  % Position the nodes using a matrix layout

  \matrix{
    \& \node[component] (crd) {CRD}; \\
    \& \node[operator] (operator) {Operator}; \\
        \path
          node[service] (service-master) {Master}
          node[label, right of=service-master] (service-middle) {}
          node[label, below of=service-middle] (services-label) {Services}
          node[service, right=.5cm of service-master] (service-replica) {Replica}
          node[border, behind path,
               fit=(service-master)(service-replica)(services-label)
          ] (services) {};
    \&
    \node[component] (sts) {Statefulset}; \& \node[component] (pdb) {Pod Disruption Budget}; \\
    \path
      node[service] (master-endpoint) {Master}
      node[service, right=.5cm of master-endpoint] (replica-endpoint) {Replica}
      node[label, right of=master-endpoint] (endpoint-middle) {}
      node[label, below of=endpoint-middle] (endpoint-label) {Endpoints}
      node[border, behind path,
           fit=(master-endpoint)(replica-endpoint)(endpoint-label)
      ] (endpoints) {}; \&
    \node[component] (pod-template) {Pod Template}; \&
    \node[border] (secrets) {
        \begin{tikzpicture}[]
            \node[secret] (users-secret) at (0, 0) {Users};
            \node[secret] (robots-secret) at (2, 0) {Robots};
            \node[secret] (standby-secret) at (4, 0) {Standby};
        \end{tikzpicture} \\
        Secrets
    }; \\ \&
    \path
      node[pod] (replica1-pod) {Replica}
      node[pod, left=.5cm of replica1-pod] (master-pod) {Master}
      node[pod, right=.5cm of replica1-pod] (replica2-pod) {Replica}
      node[label, below of=replica1-pod] (pod-label) {Pods}
      node[border, behind path,
           fit=(master-pod)(replica1-pod)(replica2-pod)(pod-label)
      ] (pods) {}; \\ \&
    \path
      node[pvc] (replica1-pvc) {Replica}
      node[pvc, left=.5cm of replica1-pvc] (master-pvc) {Master}
      node[pvc, right=.5cm of replica1-pvc] (replica2-pvc) {Replica}
      node[label, below of=replica1-pvc] (pvc-label) {Persistent Volume Claims}
      node[border, behind path,
           fit=(master-pvc)(replica1-pvc)(replica2-pvc)(pvc-label)
      ] (pvcs) {}; \&
    \\ \& \\
  };

  % Draw the arrows between the nodes and label them.
  \draw[to] (crd) -- node[midway,above] {} node[midway,below] {} (operator);
  \draw[to] (operator) -- node[midway,above] {} node[midway,below] {} (sts);
  \draw[to] (operator) -- node[midway,above] {} node[midway,below] {} (secrets);
  \draw[to] (operator) -| node[midway,above] {} node[midway,below] {} (pdb);
  \draw[to] (service-master) -- node[midway,above] {} node[midway,below] {} (master-endpoint);
  \draw[to] (service-replica) -- node[midway,above] {} node[midway,below] {} (replica-endpoint);
  \draw[to] (master-pod) -- node[midway,above] {} node[midway,below] {} (master-pvc);
  \draw[to] (replica1-pod) -- node[midway,above] {} node[midway,below] {} (replica1-pvc);
  \draw[to] (replica2-pod) -- node[midway,above] {} node[midway,below] {} (replica2-pvc);
  \draw[to] (operator) -| node[midway,above] {} node[midway,below] {} (services);
  \draw[to] (sts) -- node[midway,above] {} node[midway,below] {} (pod-template);
  \draw[to] (pod-template) -- node[midway,above] {} node[midway,below] {} (pods);
\end{tikzpicture}
\end{center}
\end{document}