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Full Discussion: DNS problem : ping doesn't recognize hostname
Special Forums IP Networking DNS problem : ping doesn't recognize hostname Post 302966544 by hiten.r.chauhan on Saturday 13th of February 2016 07:28:06 AM
Old 02-13-2016
Network
ping to 192.168.5.1 from RHEL works

Code:
[root@rhel7 ~]# ping 192.168.5.1
PING 192.168.5.1 (192.168.5.1) 56(84) bytes of data.
64 bytes from 192.168.5.1: icmp_seq=1 ttl=64 time=0.588 ms
64 bytes from 192.168.5.1: icmp_seq=2 ttl=64 time=0.566 ms
64 bytes from 192.168.5.1: icmp_seq=3 ttl=64 time=0.829 ms
^C
--- 192.168.5.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.566/0.661/0.829/0.119 ms
[root@rhel7 ~]#

The host PC ( windows - acer ) where VM is installed maintains the list of hostname and ips in its host file. As such it is not a "so called DNS server", but since it maintains the list in host file and 192.168.5.1 is specified as name server then my understanding is that it should search in the host file of acer ( 192.168.5.1)

As per your recommendation I have added acer in the host file of RHEL.
RHEL host file now looks like.

Code:
[root@rhel7 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.5.1     acer
192.168.5.128   rhel7
[root@rhel7 ~]#

Now the ping using hostname works fine

Code:
[root@rhel7 ~]# ping acer
PING acer (192.168.5.1) 56(84) bytes of data.
64 bytes from acer (192.168.5.1): icmp_seq=1 ttl=64 time=0.523 ms
64 bytes from acer (192.168.5.1): icmp_seq=2 ttl=64 time=0.653 ms
64 bytes from acer (192.168.5.1): icmp_seq=3 ttl=64 time=0.608 ms
^C
--- acer ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 0.523/0.594/0.653/0.060 ms
[root@rhel7 ~]#

But I have one more entry of ubuntu in host file of acer ( 192.168.5.1 ) . Host file of acer looks like
Code:
192.168.5.1      acer
192.168.5.128 rhel7
192.168.5.129 ubuntu15

ping to ubuntu does not work from rhel7

[root@rhel7 ~]# ping ubuntu15
ping: unknown host ubuntu15
[root@rhel7 ~]#
Last edited by hiten.r.chauhan; 02-13-2016 at 08:47 AM..
 

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LEARN ABOUT CENTOS

pmdavmware

PMDAVMWARE(1)						       Performance Co-Pilot						     PMDAVMWARE(1)

NAME

       pmdavmware - VMware performance metrics domain agent (PMDA)

DESCRIPTION

       pmdavmware is a Performance Metrics Domain Agent (PMDA) which exports metric values from a (possibly remote) VMware virtualisation host.

       This implementation uses the VMare Perl API (refer to the online docs at http://www.vmware.com/support/developer/viperltoolkit).  VIPerl is
       a prerequisite for this PMDA, it needs to be installed and configured before attempting to use this agent.  It is highly recommended that
       you test your VIPerl installation using the demo programs that are shipped with VIPerl, before attempting to use this PMDA.

INSTALLATION

       In order to access performance data using the VIPerl API, it is necessary to be able to login to the metrics source.  Hence, a valid VMware
       server name, user name and pass word are needed by the PMDA.  These can be passed in on the command line (via the pmcd.conf file) or via a
       vmware.conf file in the PMDA directory.

	       # cd $PCP_PMDAS_DIR/vmware
	       # [ edit vmware.conf ]

       This file should contain three lines, such as:

	       $server = 'vm.server.net';
	       $username = 'XXXX';
	       $password  = 'YYYY';

       Once this is setup, you can access the names and values for the vmware performance metrics by doing the following as root:

	       # cd $PCP_PMDAS_DIR/vmware
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       If you want to undo the installation, do the following as root:

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       pmdavmware is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
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       $PCP_PMDAS_DIR/vmware/vmware.conf
	   configuration file for the pmdavmware agent

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	   installation script for the pmdavmware agent

       $PCP_PMDAS_DIR/vmware/Remove
	   undo installation script for the pmdavmware agent

       $PCP_LOG_DIR/pmcd/vmware.log
	   default log file for error messages from pmdavmware

SEE ALSO

       pmcd(1).

3.8.10							       Performance Co-Pilot						     PMDAVMWARE(1)
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