Nscd itself is a caching daemon for NSS functions. So the focus is a bit different than native caching nameservers. So if you just want a caching nameserver, use something else than nscd. If instead you wish to cache things like shared usernames and hostdata outside of the normal DNS system, go for nscd.
Some Debian Linux like Ubuntu still uses systemd-resolve. This resolve is already built into the system in Ubuntu and it is being used for a lot of things by the operating system automatically without the user’s knowledge. Its already installed and set up in Ubuntu, the user just has to enter the command to flush the DNS and it will get done. Ubuntu Universe amd64 Official nscd_2.30-0ubuntu2_amd64.deb: GNU C Library: Name Service Cache Daemon: unscd_0.53-1build3_amd64.deb: Micro Name Service Caching Daemon On Ubuntu 16.04 LTS, DNS cache is not enabled by default. But some applications like bind, dnsmasq, nscd etc. may cache it. If you’re using nscd for caching DNS queries, then you can flush the DNS cache by simply restarting the nscd service. You can restart the nscd service on Ubuntu 16.04 LTS to flush DNS caches with the following command: Mar 13, 2020 · Like I said, Ubuntu doesn’t cache DNS entries by default, however, if you have manually installed a DNS service such as nscd, you can clear its cache. Methods to clear cache for some common DNS services are given below: The file /etc/nscd.conf is read from nscd(8) at startup. Each line specifies either an attribute and a value, or an attribute, service, and a value. Fields are separated either by SPACE or TAB characters. A '#' (number sign) indicates the beginning of a comment; following characters, up to the end of the line, are not interpreted by nscd. This can cause NFS locking to fail on the machine where the NSCD service is running, unless that service is manually restarted. To avoid this problem, enable caching for hosts and services in the /etc/nscd.conf file and rely on the SSSD cache for the passwd , group , and netgroup entries. nscd. Name Service Caching Daemon. Nscd caches name service lookups and can dramatically improve performance with NIS, NIS+, and LDAP. Version 2.26
Some Debian Linux like Ubuntu still uses systemd-resolve. This resolve is already built into the system in Ubuntu and it is being used for a lot of things by the operating system automatically without the user’s knowledge. Its already installed and set up in Ubuntu, the user just has to enter the command to flush the DNS and it will get done.
Nscd should be run at boot time by /etc/init.d/nscd. From man nslcd DESCRIPTION nslcd is a daemon that will do LDAP queries for local processes that want to do user, group and other naming lookups (NSS) or do user authentication, authorisation or password modification (PAM). How To Flush DNS Cache On Linux (For systemd-resolved This article explains how to flush the DNS cache (clear it) on Linux, not only for systems that use systemd-resolved (e.g. Ubuntu 18.04 and newer), but also for those using nscd, BIND or Dnsmasq to cache DNS queries. DNS, or Domain Name System, is like the Internet's phonebook, translating human-friendly computer hostnames into IP addresses.
Installing nscd and doing sudo service nscd restart && sudo service network-manager restart removes the need to reboot for me. – 01AutoMonkey Jun 29 '17 at 17:10 Ubuntu 16: Failed to restart nscd.service: Unit nscd.service not found – Paulo Pedroso Jan 31 '19 at 11:46
Jun 02, 2012 · Linux can run nscd or BIND or dnsmasq as the name service caching daemon. Large and work-group servers may use BIND or dnsmasq as a dedicated caching server to speed up queries. ADVERTISEMENTS Jun 03, 2020 · nscd stands for N ame S ervice C ache D aemon and is used to provide cache for common name service request. For providing hosts cache nscd daemon uses /etc/hosts file as it's database and any changes made to the database is immediately noticd ny nscd and it will flush the cache once these are changed. The file /etc/nscd.conf is read from nscd(8) at startup. Each line specifies either an attribute and a value, or an attribute, service, and a value. This is the Name Service Cache Daemon. It takes care of group and password lookups for running programs and then caches the lookup results for the next query for services that can experience slowness in picking up changes such as NIS or LDAP. If you’re running these services, you may want to run nscd.