DNS is short for Domain Name System. It is simply a database that links meaningful names (known as hostnames), such as www.howtouselinux.com, to a specific IP address, such as 185.230.63.171. Each device connected to the Internet has a unique IP address. With the system of DNS, we don’t have to memorize IP addresses. DNS records …
David Cao
We can use the following steps to remove a datacenter in the Cassandra cluster. Check the network connection for TCP port 9042 with this command. netstat -anpl|grep 9042. This is to make sure all the clients are not connecting to this DC. Run a full repair for the data Check the replication factor for all …
The traceroute command is used to trace the exact routing hops and the path that the packets take to the remote destination. This command’s purpose is to test and display the communication link between a source host and a destination host or network. We will dive into traceroute command today to see how it works. …
In Cassandra, data in a replica can become inconsistent with other replicas due to the distributed nature of the database. Node repair corrects the inconsistencies so that eventually all nodes have the same and most up-to-date data. It is an important part of regular maintenance for every Cassandra cluster. Cassandra Anti-Entropy Repairs Anti-entropy repair in …
EDNS stands for Extended DNS. EDNS gives us a mechanism to send DNS data in larger packets over UDP. The most popular implementation of EDNS is DNSSEC. History of EDNS Traditional DNS responses are typically small in size (less than 512 bytes) and fit nicely into a small UDP packet. Sometimes we have to transfer …
A TXT record (short for text record) is a type of resource record in DNS. It is used to store descriptive text for the domain name. This type of record can be used to provide additional information about your domain, such as SPF records or verification codes. It is also commonly used by email servers …
Linux find command is a powerful tool that can be used to locate and manage files and directories based on a wide range of search criteria. This means that we can provide it with a set of directories (or files) or filters, and it will apply appropriate actions to them. This post covers 20 advanced …
Dig is a very powerful Linux command to query DNS in Linux. We will dive into the dig command output today. The dig command is a DNS lookup utility that can be used to troubleshoot DNS issues in Linux. It can also be used to query DNS records. The dig command can be used to …
DNS port is confusing for many people. In this article, we’ll describe how DNS works, and what DNS port numbers are used for DNS protocol. Port Usage TCP port 53: Large DNS responses (TCP is used when the DNS response exceeds the maximum size that can be accommodated in a single UDP packet.) DNS zone …
TCP is defined as a connection-oriented and reliable protocol. We will check out how TCP connection works in this article. How TCP Connection Works? TCP allows for the transmission of information in both directions. This means that computer systems that communicate over TCP can send and receive data at the same time, similar to a …