Ubuntu resolving on 127.0.0.1 with no dnsmasq
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We are running a Zimbra server on 16.04. today we changed the ip address and location of the server. Most issues have been resolved other than name resolution. The server is listening on 127.0.0.1 but unable to resolve. If we change resolv.conf to 8.8.8.8 we can resolve, However, resolve.conf will get overwritten of course. interfaces is set up correctly with dns-nameservers 8.8.8.8 - not really sure why it is listening on 127.0.0.1?
Trying to understand why resolv.conf is reverting to 127.0.0.1 when dns-nameservers is correctly set? Note, we are not running dnsmasq. Also this is a basic virtual machine install (I dont believe Network Manager is installed)
Appologies if this is a simple question!
networking dns
asked Jun 11 at 8:20
skyman
1165
add a comment |Â
up vote
1
down vote
favorite
We are running a Zimbra server on 16.04. today we changed the ip address and location of the server. Most issues have been resolved other than name resolution. The server is listening on 127.0.0.1 but unable to resolve. If we change resolv.conf to 8.8.8.8 we can resolve, However, resolve.conf will get overwritten of course. interfaces is set up correctly with dns-nameservers 8.8.8.8 - not really sure why it is listening on 127.0.0.1?
Trying to understand why resolv.conf is reverting to 127.0.0.1 when dns-nameservers is correctly set? Note, we are not running dnsmasq. Also this is a basic virtual machine install (I dont believe Network Manager is installed)
Appologies if this is a simple question!
networking dns
asked Jun 11 at 8:20
skyman
1165
Have you reload the network configuration ? (or just reboot the machine ?)
– Eraseth
Jun 11 at 8:35
both, but more recently by restarting networking.service
– skyman
Jun 11 at 8:51
Can you reach the DNS server you try to configure ? (ping)
– Eraseth
Jun 11 at 8:58
so dns-nameservers is set to 8.8.8.8 - which I can ping yes. I was trying to work out if there was any local DNS server running - but it appears not. netstat shows 127.0.0.1:55 - is this normal?
– skyman
Jun 11 at 9:46
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
We are running a Zimbra server on 16.04. today we changed the ip address and location of the server. Most issues have been resolved other than name resolution. The server is listening on 127.0.0.1 but unable to resolve. If we change resolv.conf to 8.8.8.8 we can resolve, However, resolve.conf will get overwritten of course. interfaces is set up correctly with dns-nameservers 8.8.8.8 - not really sure why it is listening on 127.0.0.1?
Trying to understand why resolv.conf is reverting to 127.0.0.1 when dns-nameservers is correctly set? Note, we are not running dnsmasq. Also this is a basic virtual machine install (I dont believe Network Manager is installed)
Appologies if this is a simple question!
networking dns
asked Jun 11 at 8:20
skyman
1165
We are running a Zimbra server on 16.04. today we changed the ip address and location of the server. Most issues have been resolved other than name resolution. The server is listening on 127.0.0.1 but unable to resolve. If we change resolv.conf to 8.8.8.8 we can resolve, However, resolve.conf will get overwritten of course. interfaces is set up correctly with dns-nameservers 8.8.8.8 - not really sure why it is listening on 127.0.0.1?
Trying to understand why resolv.conf is reverting to 127.0.0.1 when dns-nameservers is correctly set? Note, we are not running dnsmasq. Also this is a basic virtual machine install (I dont believe Network Manager is installed)
Appologies if this is a simple question!
networking dns
asked Jun 11 at 8:20
skyman
1165
edited Jun 11 at 8:34
asked Jun 11 at 8:20
skyman
1165
asked Jun 11 at 8:20
skyman
1165
asked Jun 11 at 8:20
skyman
1165
1165
Have you reload the network configuration ? (or just reboot the machine ?)
– Eraseth
Jun 11 at 8:35
both, but more recently by restarting networking.service
– skyman
Jun 11 at 8:51
Can you reach the DNS server you try to configure ? (ping)
– Eraseth
Jun 11 at 8:58
so dns-nameservers is set to 8.8.8.8 - which I can ping yes. I was trying to work out if there was any local DNS server running - but it appears not. netstat shows 127.0.0.1:55 - is this normal?
– skyman
Jun 11 at 9:46
add a comment |Â
Have you reload the network configuration ? (or just reboot the machine ?)
– Eraseth
Jun 11 at 8:35
both, but more recently by restarting networking.service
– skyman
Jun 11 at 8:51
Can you reach the DNS server you try to configure ? (ping)
– Eraseth
Jun 11 at 8:58
so dns-nameservers is set to 8.8.8.8 - which I can ping yes. I was trying to work out if there was any local DNS server running - but it appears not. netstat shows 127.0.0.1:55 - is this normal?
– skyman
Jun 11 at 9:46
Have you reload the network configuration ? (or just reboot the machine ?)
– Eraseth
Jun 11 at 8:35
Have you reload the network configuration ? (or just reboot the machine ?)
– Eraseth
Jun 11 at 8:35
both, but more recently by restarting networking.service
– skyman
Jun 11 at 8:51
both, but more recently by restarting networking.service
– skyman
Jun 11 at 8:51
Can you reach the DNS server you try to configure ? (
ping)– Eraseth
Jun 11 at 8:58
Can you reach the DNS server you try to configure ? (
ping)– Eraseth
Jun 11 at 8:58
so dns-nameservers is set to 8.8.8.8 - which I can ping yes. I was trying to work out if there was any local DNS server running - but it appears not. netstat shows 127.0.0.1:55 - is this normal?
– skyman
Jun 11 at 9:46
so dns-nameservers is set to 8.8.8.8 - which I can ping yes. I was trying to work out if there was any local DNS server running - but it appears not. netstat shows 127.0.0.1:55 - is this normal?
– skyman
Jun 11 at 9:46
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
1
down vote
accepted
The solution was as follows:
Zimbra does run a DNS cache which must be configured to reference an appropriate DNS server.
to check current DNS
zmprov getServer `zmhostname` | grep DNSMasterIP
to remove old DNS
zmprov ms `zmhostname` -zimbraDNSMasterIP 192.168.1.45
to add new DNS
zmprov ms `zmhostname` +zimbraDNSMasterIP 8.8.8.8
Zimbra's dnscache listens on 127.0.0.1 - we had the intenal reference DNS set to an old internal dns server rather than an external one.
dnscache will override resolve.conf in Ubuntu resetting it to 127.0.0.1
answered Jun 12 at 0:37
skyman
1165
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
accepted
The solution was as follows:
Zimbra does run a DNS cache which must be configured to reference an appropriate DNS server.
to check current DNS
zmprov getServer `zmhostname` | grep DNSMasterIP
to remove old DNS
zmprov ms `zmhostname` -zimbraDNSMasterIP 192.168.1.45
to add new DNS
zmprov ms `zmhostname` +zimbraDNSMasterIP 8.8.8.8
Zimbra's dnscache listens on 127.0.0.1 - we had the intenal reference DNS set to an old internal dns server rather than an external one.
dnscache will override resolve.conf in Ubuntu resetting it to 127.0.0.1
answered Jun 12 at 0:37
skyman
1165
add a comment |Â
up vote
1
down vote
accepted
The solution was as follows:
Zimbra does run a DNS cache which must be configured to reference an appropriate DNS server.
to check current DNS
zmprov getServer `zmhostname` | grep DNSMasterIP
to remove old DNS
zmprov ms `zmhostname` -zimbraDNSMasterIP 192.168.1.45
to add new DNS
zmprov ms `zmhostname` +zimbraDNSMasterIP 8.8.8.8
Zimbra's dnscache listens on 127.0.0.1 - we had the intenal reference DNS set to an old internal dns server rather than an external one.
dnscache will override resolve.conf in Ubuntu resetting it to 127.0.0.1
answered Jun 12 at 0:37
skyman
1165
add a comment |Â
up vote
1
down vote
accepted
up vote
1
down vote
accepted
The solution was as follows:
Zimbra does run a DNS cache which must be configured to reference an appropriate DNS server.
to check current DNS
zmprov getServer `zmhostname` | grep DNSMasterIP
to remove old DNS
zmprov ms `zmhostname` -zimbraDNSMasterIP 192.168.1.45
to add new DNS
zmprov ms `zmhostname` +zimbraDNSMasterIP 8.8.8.8
Zimbra's dnscache listens on 127.0.0.1 - we had the intenal reference DNS set to an old internal dns server rather than an external one.
dnscache will override resolve.conf in Ubuntu resetting it to 127.0.0.1
answered Jun 12 at 0:37
skyman
1165
The solution was as follows:
Zimbra does run a DNS cache which must be configured to reference an appropriate DNS server.
to check current DNS
zmprov getServer `zmhostname` | grep DNSMasterIP
to remove old DNS
zmprov ms `zmhostname` -zimbraDNSMasterIP 192.168.1.45
to add new DNS
zmprov ms `zmhostname` +zimbraDNSMasterIP 8.8.8.8
Zimbra's dnscache listens on 127.0.0.1 - we had the intenal reference DNS set to an old internal dns server rather than an external one.
dnscache will override resolve.conf in Ubuntu resetting it to 127.0.0.1
answered Jun 12 at 0:37
skyman
1165
answered Jun 12 at 0:37
skyman
1165
answered Jun 12 at 0:37
skyman
1165
answered Jun 12 at 0:37
skyman
1165
1165
add a comment |Â
add a comment |Â
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Have you reload the network configuration ? (or just reboot the machine ?)
– Eraseth
Jun 11 at 8:35
both, but more recently by restarting networking.service
– skyman
Jun 11 at 8:51
Can you reach the DNS server you try to configure ? (
ping)– Eraseth
Jun 11 at 8:58
so dns-nameservers is set to 8.8.8.8 - which I can ping yes. I was trying to work out if there was any local DNS server running - but it appears not. netstat shows 127.0.0.1:55 - is this normal?
– skyman
Jun 11 at 9:46