How do I clear DNS cache using BASH shell prompt under UNIX like operating systems?
DNS queries are cached to speed up DNS data access.
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Linux – NSCD
Nscd caches libc-issued requests to the Name Service. If retrieving NSS data is fairly expensive, nscd is able to speed up consecutive access to the same data dramatically and increase overall system performance. Type the following command under Linux operating systems. Open a terminal and enter:
/etc/init.d/nscd restart
OR
sudo /etc/init.d/nscd restart
MAC OS X
Open a terminal and type the following command under OS X Leopard (v10.5):
dscacheutil -flushcache
Note if you are Mac OS X Tiger (v10.4) user, enter:
lookupd -flushcache
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Red Hat / CentOS Check and List Running Services Linux Command
| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |