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--- wiki:add_dns_server [2017/01/12 11:46] – created walkeradmin
+++ wiki:add_dns_server [2023/03/09 22:35] (current) – external edit 127.0.0.1
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 ====== Add DNS Server ======
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+<color orange>Jan 2017</color>
+----
 Normally we just add the IP Address, Subnet Mask and Gateway to the ifcfg-eth0 file, as that is all we need. But if it is required that we need to update the OS, or add a piece of software (htop for example) then we may need to add the DNS settings.
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+While this was written with CentOs 6/7 in mind, it may work for other Linux distributions.
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+----
 ==== Method 1 ====
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+Use "PEERDNS=no". This option will prevent /etc/resolv.conf from being modified by a DHCP server. So instead of using DHCP-provided DNS, you can specify any arbitrary DNS servers you want to use in /etc/resolv.conf.
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+The configuration file for your network interface (e.g., eth0) looks like the following.
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+**//sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0//**
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+DEVICE=eth0\\
+BOOTPROTO=dhcp\\
+ONBOOT=yes\\
+**PEERDNS=no**\\
+\\
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+Then, add static DNS to /etc/resolv.conf
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+**//sudo vi /etc/resolv.conf//**
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+nameserver 8.8.8.8\\
+nameserver 8.8.4.4\\
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+----
+==== Method 2 ====
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+Alternatively, you can specify DNS servers directly in the interface configuration file, instead of modifying /etc/resolv.conf yourself. That is:
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+**//sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0//**
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+\\
+DEVICE=eth0\\
+BOOTPROTO=dhcp\\
+ONBOOT=yes\\
+**DNS1=8.8.8.8**\\
+**DNS2=8.8.4.4**\\
+\\
+\\
+The DNS servers specified with "DNS1/DNS2" directives will then automatically be added to **/etc/resolv.conf** when the interface is activated. So there is no need to modify **/etc/resolv.conf** yourself.