Here is the thing: 1. It is preferred to set up the host with fqdn to run hadoop. The indication of a good fqdn setup is the output of "hostname -f" contains dots. 2. The quick fix to your environment is: a. in /etc/sysconfig/network, change HOSTNAME=localhost b. run command "hostname localhost" c. in your etc/hosts, change it to the following: 127.0.0.1 localhost.localdomain localhost
Now, if you run "hostname -f", you will get localhost.localdomain. On Wed, Apr 2, 2014 at 5:59 PM, Alex Lee <[email protected]> wrote: > This is the command result, > [root@localhost yum.repos.d]# hostname > localhost.localdomain > [root@localhost yum.repos.d]# hostname -f > localhost > [root@localhost yum.repos.d]# cat /etc/hosts > > 127.0.0.1 localhost localhost.localdomain localhost4 > localhost4.localdomain4 > ::1 localhost localhost.localdomain localhost6 > localhost6.localdomain6 > [root@localhost yum.repos.d]# > > Should I change it to some own defined domain in hosts file or network > file. > > ------------------------------ > From: [email protected] > Date: Wed, 2 Apr 2014 17:24:59 +0800 > > Subject: Re: DNS pre request for hadoop install > To: [email protected] > > If you don't know what fully qualified domain name is, google it first. > > Let me show you my configuration: > [dev@devmachine:~ ]$ hostname > devmachine > [dev@devmachine:~ ]$ hostname -f > devmachine.mydomain > [dev@devmachine:~ ]$ cat /etc/hosts > 127.0.0.1 localhost.localdomain localhost localhost4 > localhost4.localdomain4 > ::1 localhost.localdomain localhost localhost6 > localhost6.localdomain6 > 192.168.9.168 devmachine.mydomain devmachine > > where 192.168.9.168 is my machine ip, devmachine.mydomain is my host fqdn. > > > On Wed, Apr 2, 2014 at 5:13 PM, Alex Lee <[email protected]> wrote: > > In the hosts file, it has > 127.0.0.1 localhost localhost.localdomain localhost4 > localhost4.localdomain4 > ::1 localhost localhost.localdomain localhost6 > localhost6.localdomain6 > > When running hostname -f, it shows localhost. > > Will it be ok, or need to use the > > fully.qualified.domain.name > > > > ------------------------------ > From: [email protected] > Date: Wed, 2 Apr 2014 17:06:52 +0800 > Subject: Re: DNS pre request for hadoop install > To: [email protected] > > > In your /etc/hosts file. Change it to something like below: > 127.0.0.1 localhost.localdomain localhost > then run hostname -f and see what's the output. > > > On Wed, Apr 2, 2014 at 4:43 PM, Alex Lee <[email protected]> wrote: > > I am trying to use ambari (hortonwoks) to install hadoop. One step is to > pre-config DNS as manual link below. > > http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.0.9.1/bk_using_Ambari_book/content/ambari-chap1-5-5.html > > Since I am only using internal network, not sure how to config > fully.qualified.domain.name. My hostname -f only shows localhost. And in > /etc/sysconfig/network, it give HOSTNAME=localhost.localdomain > > If anyone already get hadoop running, what is the real DNS requests for > hadoop. > Any suggestion, thanks a lot. > > alex > > > > > > > -- > Cheers > -MJ > > > > > -- > Cheers > -MJ > -- Cheers -MJ
