I want to re-create this image
with tikz.
Currently I'm at this point, but I don't know how to improve my code to make it smoother:
\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}
\usepackage{float}
\usepackage{tikz}
\usepackage{siunitx}
\usetikzlibrary{arrows,decorations.pathmorphing,backgrounds,positioning,fit,petri}
\definecolor{mycolor}{RGB}{31,22,70}
\definecolor{mycolor2}{RGB}{21,126,251}
\begin{document}
\begin{figure}[H]
\centering
\begin{tikzpicture}[
scale=0.8,
transform shape,
show background rectangle,
background rectangle/.style={fill=gray!10},
box/.style={draw, font=\itshape}
]
\coordinate (b) at (current page.center);
\node[rounded corners=3mm, label=center:{Onboard}, fill=mycolor2!20] (onboard)at (b) [draw,minimum width=2.5cm,minimum height=2.4cm] {};
\node[below right = of onboard, rounded corners=3mm, label=center:{Deploy}, fill=mycolor2!20] (deploy) [draw,minimum width=2.5cm,minimum height=2.4cm] {};
\node[below right = of deploy,rounded corners=3mm, label=center:{Monitor}, fill=mycolor2!20] (monitor) [draw,minimum width=2.5cm,minimum height=2.4cm] {};
\node[below left = of monitor, rounded corners=3mm, label=center:{Scale}, fill=mycolor2!20] (scale) [draw,minimum width=2.5cm,minimum height=2.4cm] {};
\node[left =of scale, rounded corners=3mm, label=center:{healing/fault-recovery}, fill=mycolor2!20] (healing) [draw,minimum width=4cm,minimum height=2.4cm] {};
\node[above left = of healing, rounded corners=3mm, label=center:{Update}, fill=mycolor2!20] (update)[draw,minimum width=2.5cm,minimum height=2.4cm] {};
\node[above =of update, rounded corners=3mm, label=center:{Undeploy}, fill=mycolor2!20] (undeploy) [draw,minimum width=2.5cm,minimum height=2.4cm] {};
\draw[thick, mycolor](onboard)--(deploy);
\draw[thick, mycolor](deploy)--(monitor);
\draw[thick, mycolor](monitor)--(scale);
\draw[thick, mycolor](scale)--(healing);
\draw[thick, mycolor](healing)--(update);
\draw[thick, mycolor](update)--(undeploy);
\draw[thick, mycolor,->](undeploy)--(onboard);
\end{tikzpicture}
\caption{xxx}
\end{figure}
\end{document}

