How to check whether docker is installed in centos7

How to check whether docker is installed in centos7:

1. If the rpm package is installed, you can use rpm -qa to see it. If you want to find out whether a certain software package is installed, Use rpm -qa | grep "the name of the software or package".

 rpm -qa | grep  docker

2. If installed by yum method, you can use yum list installed to search. If you are looking for a specified package, add | grep "software name or package name" after the command;

 yum list installed | grep  docker

Recommended tutorial: centos tutorial

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