Not sure if this is a documentation bug or a Centos bug (I guess that is a matter of interpretation), but here:<br />
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<a href="https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Using_the_Command_Line_Interface.html#sec-Configuring_a_Network_Interface_Using_ifcg_Files">https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Using_the_Command_Line_Interface.html#sec-Configuring_a_Network_Interface_Using_ifcg_Files</a> [<a href="https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Using_the_Command_Line_Interface.html#sec-Configuring_a_Network_Interface_Using_ifcg_Files" target="_blank">^</a>]<br />
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it says "To configure an interface to use particular DNS servers, set PEERDNS=no as described above and add lines as follows to the ifcfg file: "<br />
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This is incorrect, /etc/resolv.conf will *only* be updated with the value of DNS1 if PEERDNS=yes.<br />
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So for the documentation to be correct it would need to read "To configure an interface to use particular DNS servers, set PEERDNS=yes as described above and add lines as follows to the ifcfg file: "<br />
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even if that does mean PEERDNS now has a confusing name
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