Dns
Systemd-analyze
The command systemd-analyze helps analyzing systemd components to optimize the system including performance and security.
Summary
How to see the the network IP address of your system
Show the IP address of your system with the help of the ip command.
Summary
Show your local IP address
How to see the IP address of your internet connection
Show the IP address of your internet connection using the dig command.
Summary
Query the IP address of your internet connection
How to see which DNS server is used
Find the active DNS server being used by reviewing the network configuration, including common commands to query this information.
Summary
Show the active DNS server
Show to clear the DNS cache with systemd
Learn how to inspect and clear the DNS cache when using the systemd resolver daemon.
Summary
Clear DNS cache using resolvectl
Resolvectl
The command resolvectl provides details about systemd-resolved, the name resolution daemon.
Summary
How to see the TTL value of a DNS record
Learn how to query the Time To Live (TTL) for a DNS record by using the dig tool.
Summary
Query DNS to reveal the TTL value of a DNS record.
Linux DNS Tuning for Performance and Resilience
Linux DNS configuration is usually done during the installation of the system. With proper configuration and tuning, you gain performance and stability.
Summary
DNS Configuration on Linux We often don’t realize the importance of DNS, or name resolving in our infrastructure. The impact when things go (slightly) wrong is huge. Time to have a good look at improving our DNS configuration. How DNS resolving works When your Linux system needs to know the IP address of a particular host, it will use gethostbyname(3) function. This will use the nsswitch configuration stored in /etc/nsswitch.conf. For the related hosts line, it will determine how to do resolving.