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--- computers:dns_server_configuration [2011/08/26 10:56] – created chkuo
+++ computers:dns_server_configuration [2020/08/16 01:53] (current) – chkuo
@@ Line 4: / Line 4: @@
 Download and install the packages
 <code bash>
-sudo apt-get install bind9
+sudo apt install bind9 bind9utils bind9-doc bind9-host dnsutils
-sudo apt-get install dnsutils
 </code>
 ===== Configuration =====
-To setup a caching nameserver, add the IP addresses of the ISP's (e.g., Academia Sinica) DNS servers. Uncomment and edit the following in ''/etc/bind/named.conf.options'':
+==== DNS Forwarders ====
+To setup a caching nameserver, add the IP addresses of the ISP's (e.g., Academia Sinica) DNS servers. Uncomment and edit the following in ''/etc/bind/named.conf.options'':
 <code bash>
 forwarders {
-.109.13.10;
+		// Google
-.109.1.10;
+.8.8.8;
+.8.4.4;
            };
 </code>
-===== Activation =====
+==== Logging ====
-To start/stop/restart the service:
+add the following code to ''/etc/bind/named.conf.local'':
+<code bash>
+logging {
+	channel default-log {
+		file "/var/log/named/default.log" size 100m;
+		severity info;
+		print-time yes;
+	};
+	channel lamer-log {
+		file"/var/log/named/lamer.log" size 100m;
+		severity info;
+		print-severity yes;
+		print-time yes;
+		print-category yes;
+	};
+	channel query-log {
+		file "/var/log/named/query.log" size 1000m;
+		severity info;
+		print-time yes;
+	 };
+	channel security-log {
+		file"/var/log/named/security.log" size 100m;
+		severity info;
+		print-severity yes;
+		print-time yes;
+		print-category yes;
+	};
+	category default { default-log;};
+	category lame-servers { lamer-log; };
+	category queries { query-log;};
+	category security { security-log;};
+};
+</code>
+prepare log directory:
+<code bash>
+sudo mkdir -p /var/log/named
+sudo chown bind:bind /var/log/named
+</code>
+note:
+the log directory "/var/log/named" is hard-coded in ''/etc/apparmor.d/usr.sbin.named''
+<code bash>
+  # some people like to put logs in /var/log/named/ instead of having
+  # syslog do the heavy lifting.
+  /var/log/named/** rw,
+  /var/log/named/ rw,
+</code>
+this part would need to be changed if a custom log directory is used.
+start service
+<code bash>
+# enable auto start at boot time:
+sudo systemctl enable named
+# start
+sudo systemctl start named
+</code>
+check status
+<code bash>
+systemctl status named
+</code>
+check the "Current DNS Server"
+<code bash>
+systemd-resolve --status
+</code>
+To set BIND as the default resolver, edit ''/etc/systemd/resolved.conf''
+In the [Resolve] section, add ''DNS=127.0.0.1''
 <code bash>
-sudo /etc/init.d/bind9 start
+# restart and check again
-sudo /etc/init.d/bind9 stop
+sudo systemctl restart systemd-resolved
-sudo /etc/init.d/bind9 restart
+systemd-resolve --status
 </code>
@@ Line 75: / Line 146: @@
 ===== References =====
   * [[https://help.ubuntu.com/10.04/serverguide/C/dns.html]]
+  * [[https://www.linuxbabe.com/ubuntu/set-up-local-dns-resolver-ubuntu-20-04-bind9]]