Build unbound from source on redhat/centos

NOTE: unbound is now available via epel repo on Amazon Linux
    1. install requirements
      1. yum groupinstall "Development Tools"
      2. yum install openssl-devel
      3. yum install expat-devel
    2. build
      1. ldns
        1. wget http://www.nlnetlabs.nl/downloads/ldns/ldns-1.6.16.tar.gz
        2. tar zxvf ldns-1.6.16.tar.gz
        3. cd ldns-1.6.16/
        4. ./configure --disable-gost --disable-ecdsa
        5. make
        6. make install
      2. unbound
        1. wget http://unbound.net/downloads/unbound-latest.tar.gz
        2. tar zxvf unbound-latest.tar.gz
        3. cd unbound-1.4.20/
        4. ./configure --disable-gost --disable-ecdsa
        5. make
        6. make install
    3. add libs to system lib path
      1. vi /etc/ld.so.conf.d/ldnsandunbound.conf
        1. add this one line
          1. /usr/local/lib
      2. sudo ldconfig
    4. add unbound user
      1. adduser --system unbound
    5. tweak config
      1. vi /usr/local/etc/unbound/unbound.conf
        1. see simple sample below
    6. run
      1. unbound
    7. check
      1. lsof -nP -i :53
    8. stop
      1. pkill unbound
    9. restart
      1. unbound
    server:
            verbosity: 1
            interface: 0.0.0.0
            access-control: 10.0.0.0/16 allow
    forward-zone:
           name: "my-vpc.internal"
           forward-addr: 252.252.199.199
           forward-first: no

    Taken: https://calomel.org/unbound_dns.html

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