/etc/hosts can not help reverse lookup, so setting up your private DNS server is needed if you do not have corporate DNS server which can be used for this Hadoop Cluster.
Below steps are tested on CentOS 6.4.
Please note that, different platform/OS have different directories for configuration files.
Here are the current IP<->hostname mapping in this example, "hdm.xxx.com" is selected as my private DNS server:
192.168.192.100 admin.xxx.com 192.168.192.101 hdm.xxx.com 192.168.192.103 hdw1.xxx.com 192.168.192.102 hdw2.xxx.com 192.168.192.104 hdw3.xxx.com
1. Install below libraries on selected DNS server.
Note: Here I do not install "bind-chroot" package.bind (includes DNS server, named) bind-utils (utilities for querying DNS servers about host information) bind-libs (libraries used by the bind server and utils package)eg:
[root@hdm ~]# rpm -qa |grep ^bind bind-9.8.2-0.23.rc1.el6_5.1.x86_64 bind-libs-9.8.2-0.23.rc1.el6_5.1.x86_64 bind-utils-9.8.2-0.23.rc1.el6_5.1.x86_64
2. Configure /etc/named.conf
2.1 Allow queries on any interface
listen-on port 53 { any; };
2.2 Forward Zone File References in named.conf
Point to your zone file named "hadoop.zone".Here we only allow queries from 192.168.192.x network.
zone "xxx.com" { type master; notify no; allow-query { 192.168.192.1/24 }; file "hadoop.zone"; };
2.3 Reverse Zone File References in named.conf
Point to your zone file named "192-168-192.zone" for 192.168.192.x network.zone "192.168.192.in-addr.arpa" { type master; notify no; allow-query { any; }; file "192-168-192.zone"; };
3. Configuring The Zone Files /var/named/hadoop.zone
$ORIGIN xxx.com. $TTL 3D @ IN SOA hdm.xxx.com. hostmaster.xxx.com. ( 200211152 ; serial# 3600 ; refresh, seconds 3600 ; retry, seconds 3600 ; expire, seconds 3600 ) ; minimum, seconds NS hdm ; Inet Address of nameserver localhost A 127.0.0.1 admin A 192.168.192.100 hdm A 192.168.192.101 hdw1 A 192.168.192.103 hdw2 A 192.168.192.102 hdw3 A 192.168.192.104
4. Configuring Reverse Zone File /var/named/192-168-192.zone
$ORIGIN 192.168.192.in-addr.arpa. $TTL 3D @ IN SOA hdm.xxx.com. hostmaster.xxx.com. ( 200303301 ; serial number 8H ; refresh, seconds 2H ; retry, seconds 4W ; expire, seconds 1D ) ; minimum, seconds NS hdm.xxx.com. ; Nameserver Address 100 PTR admin.xxx.com. 101 PTR hdm.xxx.com. 102 PTR hdw2.xxx.com. 103 PTR hdw1.xxx.com. 104 PTR hdw3.xxx.com.
5. Start named
/etc/init.d/named start
6. Edit /etc/resolv.conf on this DNS server.
Add below entry as the first "nameserver" entry.nameserver 127.0.0.1
7. Edit /etc/resolv.conf on other servers.
Add below entry as the first "nameserver" entry.(192.168.192.101 is the IP of the DNS server.)
nameserver 192.168.192.101
8. Test
[root@admin ~]# host hdm.xxx.com hdm.xxx.com has address 192.168.192.101 [root@admin ~]# host 192.168.192.101 101.192.168.192.in-addr.arpa domain name pointer hdm.xxx.com.
9. Enable named to auto start on DNS server.
chkconfig named on
Refer to: <Quick HOWTO : Ch18 : Configuring DNS>
No comments:
Post a Comment