<p>i followed below steps on centos 7 machine to install docker but it says nothing to do and when i run docker command it says that command not found.
i followed below steps on centos 7 machine to install docker but it says nothing to do and when i run docker command it says that command not found.</p>

<pre><code>**sudo yum check-update
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker**
</code></pre>

<p>on some other machine same commands worked but its having some strange behaviour on this machine.</p>

<p>running following steps solved the issue:</p>

<ol>
<li><p>some how firewall started creating problem , so i had to check
the internet connection as below: 
curl --location-trusted --ntlm --user "xyz" www.google.com enter password </p></li>
<li><p>yum install <a href="http://mirror.centos.org/centos/7/extras/x86_64/Packages/container-selinux-2.107-3.el7.noarch.rpm" rel="nofollow noreferrer">http://mirror.centos.org/centos/7/extras/x86_64/Packages/container-selinux-2.107-3.el7.noarch.rpm</a></p></li>
<li><p>yum -y install docker-ce</p></li>
</ol>
