Questions tagged [dns]
For use in questions relating to the Domain Name System and associated processing.
33
questions
0
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35
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Postgres / Npgsql slow connection due to Hosts file organisation
I'm not really sure if this is the right place to post this but I happened across a peculiar behaviour yesterday.
Historically, when debugging locally, our application's first connection to a given ...
- 21
0
votes
0
answers
46
views
DNS permissions for Availability Groups
can anyone tell me the correct permissions for the Listener and Cluster records in DNS?
At the moment I have a single subnet AG where the Listener VNN owns the cluster DNS entry and vice versa, so the ...
- 1
1
vote
0
answers
127
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How can I connect to my replicaset via DNS and private IP?
I have 2 node setup
10.1.0.7 - mongodb-1.com (primary)
10.1.0.8 - mongodb-2.com (secondary)
here is my mongod.conf
net:
port: 27017
bindIp: 0.0.0.0
tls:
mode: allowTLS
...
- 129
0
votes
1
answer
860
views
Updating DNS on Availability Group database servers
We have always on availability group that spans across different data centers. Our network team has decommissioned some DNS servers and those servers will need to be updated with the active ones on ...
- 1,039
0
votes
1
answer
311
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Return Current Connection CName
I'm wondering if anyone knows if there is a way to return the name that was used to connect to the SQL server rather than the actual server's name. For instance I typically connect to the server via a ...
- 223
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141
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Linked Server Using a DNS Alias Returning Bad Data
Somehow on the same DEV server we have two Linked Servers to the same PROD server. While that, in and of itself, is not an issue; we have noted something we can't explain and we wonder of anyone else ...
- 135
0
votes
1
answer
429
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MultiSubnetFailover=true for DBMSes besides SQL Server
A connection string for SQL Server can contain MultiSubnetFailover=true, to handle multiple DNS A records, letting the client try to connect to every IP address of a domain (or subdomain) name, to ...
- 189
0
votes
1
answer
556
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Failover and DNS propagation delays
When a DBMS fails over after a failure, if it fails over to a server in a different and unrelated data center, then the IP address of the subdomain name of that database will need to be changed in ...
- 189
1
vote
1
answer
487
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How to see urls of incoming SQL Server traffic?
We are migrating the dns entry for our SQL Server database from an machine name to a C-Name, in preparation for moving it from a bare metal box to a virtual machine. We have switched all the ...
- 149
1
vote
2
answers
34k
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Windows Cluster can't update DNS record
Setup:
Windows server 2016 standard edition.
SQL server 2016 standard edition.
2 nodes configured in a cluster without witness quorum.
all member of the same Active Directory domain.
1 Availability ...
0
votes
2
answers
529
views
PostgreSQL failover: Who is responsible for handling it? How do clients connect to the new leader?
On a high level, consider two PostgreSQL instances on two separate nodes: the leader and its hot standby. Replication from leader to follower is configured.
Consider that the leader node crashes. Two ...
- 101
3
votes
0
answers
2k
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DNS CNAME for a SQL Managed Instance (Azure)
I currently have an on Prem SQL Instance that has a DNS CNAME set up against it via our On Prem DNS Server.
I am looking to move this server to an Azure Managed Instance and I want to point the DNS ...
- 84
1
vote
0
answers
18
views
details on how to connect to geographically close datacenter
I am reading a book about distributed systems. One of the options of data replication mentioned is the use of a "multi leader" approach and place each leader in a different datacenter. The main point ...
- 253
6
votes
2
answers
3k
views
Are CNAME aliases for connection strings a good idea?
To be very flexible and move database to different servers more easily, we came up with the idea of using an alias per database. So by simply changing a DNS entry, we can route all queries to a ...
- 359
0
votes
1
answer
299
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Postgresql responses are slow without internet
I have a Postgres service in Centos 7 and it works normally.
Each time when the internet service (by an IPS) is down, the responses are slow, other times the DNS is reset by an electrical trouble, ...
Jose Gomez
0
votes
1
answer
474
views
Duplicate Ips for cluster nodes causing backup issues
We have a four node cluster (SQL Server 2014 on Windows 12) and we recently setup heart beat network on the nodes following a best practices source after experiencing some cluster instability issues. ...
1
vote
0
answers
183
views
Domain Independent Cluster on AWS
I am trying to work out whether it's possible to create a Domain Independent Workgroup Cluster in AWS (on Windows Server 2016 for use with SQL 2017 Availability Groups). This environment also has no ...
- 53
4
votes
1
answer
401
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Using DNS per application in ConnectionStrings
I have come across an idea recently when I had to migrate a ton of in-house applications to a new SQL server. The more I look at it, the more it sounds perfect, but I wanted to ask the community for ...
- 507
5
votes
2
answers
74k
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Cluster network name resource 'Cluster Name' failed registration
I have a fail-over cluster set between two Windows Server 2016 machines, and I'm seeing errors regarding the DNS record, both for the cluster itself and for any listener I try to add in SQL high ...
- 51
1
vote
1
answer
3k
views
Multi-Subnet AG - DNS flips to secondary IP
I have a 3-node FCI: 1 primary / 1 secondary co-located in same data center on same subnet, and 1 secondary in a DR data center on another subnet.
Periodically, the virtual IP (VIP) for the AG ...
- 123
0
votes
1
answer
8k
views
MySQL DNS issue: skip-name-resolve connection fast but cannot log into email
MySql is used here with remote network connections, and after a reboot of the server these connections started taking 20-30 seconds to connect causing timeouts. Connections used to be nearly instant.
...
- 181
1
vote
1
answer
874
views
ODBC can't connect to internal MySQL without external network
Running ODBC 5.2 (10.0.0.10) and MySQL 4.x (10.0.0.50). Yes, I know that ODBC 5.x dosen't officaly support MySQL 4.x but it was working fine for ~8 months till now when we have little problems with ...
- 193
2
votes
2
answers
157
views
Creating an index of wildcard DNS names
I want to have a table column which will be filled with wildcard-type DNS entries, like
*.example.org
*.popularisp.net
such that I can make fast queries against actual reverse DNS hostnames, ...
1
vote
0
answers
422
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IP from a different subnet is registered even after node and resource were removed
We run two SQL server at primary site in AlwaysOn High Availability Group on subnet 10.10.0.0/24
A third SQL server is running on secondary site in a different subnet 10.10.1.0/24
We have had third ...
- 11
1
vote
1
answer
917
views
AlwaysOn Listener and DNS
We have two DNS servers which replicate entried between them and we recently had a DNS issue where some of the listener addresses were removed from one of the servers only.
At that point some of our ...
- 1,539
1
vote
2
answers
675
views
PostgreSQL/ Linux, way to have DNS forward to a port/cluster?
Aws linux(centos) ec2
Host: mydb. 10.10.10.10.
3 clusters: ports 5432, 5433, 5434
What I'd like to see is:
db2.mydb or mydb/db2 connect/fwd to cluster2 (5433).
Anything Linux or psql come to mind? ...
1
vote
1
answer
1k
views
How to design database for DNS?
What tables will be there.Also as read percentage will be significantly larger than write, is indexing on columns advised? What other precautions are necessary?
For now, I can just think of 1 table ...
SandV
5
votes
1
answer
1k
views
Suggest better design pattern for reverse DNS lookups
I'm working on a project where I need to look up the hostnames associated with IP addresses who were logged making HTTP requests. The lookups currently happen as part of a daily ETL job. The current ...
- 4,248
7
votes
2
answers
9k
views
How do I change SQL Server 2012 Availability Group DNS subdomain?
Questions: how can I get my availability group to be registered as ag-ewgtest.sql.company.com given that my server thinks of itself as server.company.com.
Setup: my SQL Server 2012 availability group ...
- 705
2
votes
2
answers
8k
views
MySQL slow queries - Fast using PHPMyAdmin , low CPU and RAM usage
I have a site running on Amazon EC2 , which runs fast and contains some reasonably complex MySQL queries.
Part of that site is an API which serves out data to another site. These queries are very ...
- 121
14
votes
3
answers
29k
views
How to grant multiple users privileges; MySQL
I have the following code:
GRANT SELECT,INSERT,UPDATE ON db1.*
TO ‘user’@example.com;
I am a beginner in mySQL, I was wondering if there is a method in which I can specific the privileges for every ...
- 241
4
votes
2
answers
752
views
Remove nulls from TSQL connection string
I have a bunch of queries, against a couple different databases, that I use to generate delimited reports. I'm trying to create some new reports against a MSSQL database and I'm having trouble ...
- 1,215
3
votes
2
answers
4k
views
MySQL Replication via DNS Failure
I'm having some trouble using replication when the machines are configured to use host names instead of IP addresses. The "skip-name-resolve" is OFF.
If I use IP addresses, everything is fine. Using ...
- 1,353