[draft] Поднимаем NTP сервер в CentOS

http://www.mad-hacking.net/documentation/linux/applications/ntp/ntpclient.xml http://www.pool.ntp.org/ru/join.html http://www.pool.ntp.org/en/join/configuration.html http://www.thegeekstuff.com/2014/06/linux-ntp-server-client/ http://www.mmouse.ru/2014/11/07/podnimaem-ntp-server-na-centos-7/

• http://serveradmin.ru/ustanovka-nastroyka-i-sinhronizatsiya-vremeni-v-centos/
• http://blog.smart-admin.ru/nastrojka-ntp-servera-v-centos.html
• https://100.org.ua/%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0-%D0%B2%D1%80%D0%B5%D0%BC%D0%B5%D0%BD%D0%B8-%D0%BD%D0%B0-%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80%D0%B5-centos-7-%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0/
• https://www.server-world.info/en/note?os=CentOS_7&p=ntp
• http://www.tecmint.com/wp-content/uploads/2014/09/NTP-Server-Configuration.png
• http://www.tecmint.com/install-ntp-server-in-centos/
• http://serverfault.com/questions/277375/ntpdate-d-server-dropped-strata-too-high
• disable ipv6