Update README.md

itsvinayak · Jan 20, 2020 · ad9449a · ad9449a
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 in simple word <mark>Docker</mark> solve the classic case of "it works on my machine"
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 by providing <a href="https://en.wikipedia.org/wiki/OS-level_virtualization" target="_blank"> OS-level virtualization </a>
 
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 <li>How they offer an alternative to virtual machines</li>
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 <b>Step 1:</b> Update Software Repositories using the following command on terminal
 <pre>$ sudo apt update</pre>
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 <b>Step 2:</b> Install Docker using the following command
 <pre>$ sudo apt install docker.io</pre>
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 <b>Step 3:</b> Setup Docker run at Startup. Docker service needs to be set up to run at startup.
 <pre>$ sudo systemctl start docker</pre>
 <pre>$ sudo systemctl enable docker</pre>