DHCP is the program which automagically configures your internet connection every time you boot up. So when you configure /etc/resolv.conf then DHCP is overwriting what you entered the next time DHCP runs. You can modify how DHCP configures resolv.conf by modifying /lib/dhcpcd/dhcpcd-hooks.
You can learn how to modify what DHCP sets up by beginning at this web page:
http://www.linuxfromscratch.org/blfs...et/dhcpcd.html
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Steve Stites