You have some network configuration modifications made automatically by NetworkManager service:
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root@vps655767 [~]# cat /etc/resolv.conf
# Generated by NetworkManager
search 5gbps.com
# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
First of all you had no DNS servers set. From your logs, I can see that the server was unable to resolv any hostname:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Aug 26 15:20:53 vps655767 named[1104]: error (network unreachable) resolving 'example.net/MX/IN': 2001:500:8c::53#53
Aug 26 15:22:17 vps655767 named[1104]: error (network unreachable) resolving 'ns.jsinfo.net/A/IN': 2001:503:231d::2:30#53
Aug 26 15:22:17 vps655767 named[1104]: error (network unreachable) resolving 'ns.jsinfo.net/AAAA/IN': 2001:503:231d::2:30#53
Aug 26 15:30:09 vps655767 named[1104]: error (network unreachable) resolving 'whois.arin.net/A/IN': 2001:500:31::108#53
Aug 26 15:30:09 vps655767 named[1104]: error (network unreachable) resolving '200.237.34.89.in-addr.arpa/PTR/IN': 2001:13c7:7010::53#53
Aug 26 15:30:10 vps655767 named[1104]: error (network unreachable) resolving 'ns1.zetservers.com/A/IN': 2607:f0d0:1101:16f::18#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns1.zetservers.com/AAAA/IN': 178.162.222.106#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns2.zetservers.com/AAAA/IN': 207.244.82.114#53
Aug 26 15:30:10 vps655767 named[1104]: error (network unreachable) resolving 'ns2.zetservers.com/AAAA/IN': 2001:500:1::803f:235#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns1.zetservers.com/AAAA/IN': 178.162.222.106#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns2.zetservers.com/AAAA/IN': 207.244.82.114#53
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You also had no gateway set in /etc/sysconfig/network-scripts/ifcfg-eth0. There was no default route, so once NetworkManager modifies configuration, connectivity to your server is lost.
After you reboot your server, the default network configuration is restored by the centos template scripts, so you have again connectivity to your server, till NetworkManager modifies your configuration again making you loose the connectivity to the server.
This is the reply from our technical staff. Please investigate your internal configuration and if you need help, please contact the technical staff again. They will be happy to assist you.
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root@vps655767 [~]# cat /etc/resolv.conf
# Generated by NetworkManager
search 5gbps.com
# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
First of all you had no DNS servers set. From your logs, I can see that the server was unable to resolv any hostname:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Aug 26 15:20:53 vps655767 named[1104]: error (network unreachable) resolving 'example.net/MX/IN': 2001:500:8c::53#53
Aug 26 15:22:17 vps655767 named[1104]: error (network unreachable) resolving 'ns.jsinfo.net/A/IN': 2001:503:231d::2:30#53
Aug 26 15:22:17 vps655767 named[1104]: error (network unreachable) resolving 'ns.jsinfo.net/AAAA/IN': 2001:503:231d::2:30#53
Aug 26 15:30:09 vps655767 named[1104]: error (network unreachable) resolving 'whois.arin.net/A/IN': 2001:500:31::108#53
Aug 26 15:30:09 vps655767 named[1104]: error (network unreachable) resolving '200.237.34.89.in-addr.arpa/PTR/IN': 2001:13c7:7010::53#53
Aug 26 15:30:10 vps655767 named[1104]: error (network unreachable) resolving 'ns1.zetservers.com/A/IN': 2607:f0d0:1101:16f::18#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns1.zetservers.com/AAAA/IN': 178.162.222.106#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns2.zetservers.com/AAAA/IN': 207.244.82.114#53
Aug 26 15:30:10 vps655767 named[1104]: error (network unreachable) resolving 'ns2.zetservers.com/AAAA/IN': 2001:500:1::803f:235#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns1.zetservers.com/AAAA/IN': 178.162.222.106#53
Aug 26 15:30:10 vps655767 named[1104]: error (unexpected RCODE REFUSED) resolving 'ns2.zetservers.com/AAAA/IN': 207.244.82.114#53
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You also had no gateway set in /etc/sysconfig/network-scripts/ifcfg-eth0. There was no default route, so once NetworkManager modifies configuration, connectivity to your server is lost.
After you reboot your server, the default network configuration is restored by the centos template scripts, so you have again connectivity to your server, till NetworkManager modifies your configuration again making you loose the connectivity to the server.
This is the reply from our technical staff. Please investigate your internal configuration and if you need help, please contact the technical staff again. They will be happy to assist you.
Last edited: