Varnish is not installed

Hello,

Apache version: Apache/2.4.25
PHP version: 7.1.4
MySQL version: 5.5.54
FTP version: 1.0.36

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[root@server /]# service varnish restart
varnish: unrecognized service
[root@server /]#

This is the situation. But there is no varnish file in the middle. What could be the problem?

try installing again varnish and provide output of it

try installing again varnish and provide output of it

Hello,
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At the moment, I am using PHP version: 5.6.30.

I have added version 3 of varnish repo. But the server is doing load. A new update is a must. Please develop a solution 

looks like varnish is not getting installed or generating some errors during the build.  check the install log file.

looks like you have some issues with yum or conflicts,try checking logs more detailed and test yum install.

I'm sorry to be late, I've reinstalled the server and it works fine.