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Amazon provides the Amazon Time Sync Service, which you can access from your instance.
How to Set Up Private DNS Servers with BIND on Ubuntu 16.04. When the DNS server receives a PTR lookup query for an example for IP: “.154”, it will check the reverse zone file to retrieve the FQDN of the IP address, in our case that would be “host1example.com”. ( 3 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; name servers IN NS ns1 This greatly depends on the OS the hosts are running but for most Linux distributions the settings that need to be changed reside in the /etc/file.Since I had to do this earlier today, I decided it would make a lot of sense to write it down for the next time that I need to do it. First, you’ll need to install NTP if it isn’t already installed.For Debian or Ubuntu, that would be this command: You’ll find a lot of lines in there, but the important ones are the server lines.In today’s article we will show you how to install, configure and administer BIND 9 as a private DNS server on a Ubuntu 16.04 VPS Then we will add a couple of configuration settings to enable recursive queries on our ns1 server and to have the server listen on our private network, add the configuration settings under the directory “/var/cache/bind” directive like in the example below: If your servers are in multiple private subnets in the same physical location, you need to specify a zone and create a separate zone file for each subnet. ( 3 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; ; name servers - NS records IN NS ns1 This consists of our hosts that are on the 10.20.0.0/16 subnet. Note: Please subsitute the names and IP addresses used in this tutorial for the names and IP addresses of the hosts in your own private network.Now we’ll create the directory where we will store our zone files in: $TTL 604800 @ IN SOA localhost. ( 2 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS localhost. In the first column we reverse the order of the last two octets from the IP address of the host we want to add: ; PTR Records 13.30 IN PTR ns1 You don’t have to Set Up Private DNS Servers with BIND on Ubuntu 16.04 yourself, if you use one of our Ubuntu Hosting Services, in which case you can simply ask our expert Linux admins to Set Up Private DNS Servers with BIND on Ubuntu 16.04 for you.