{"id":3018,"date":"2023-06-27T00:34:36","date_gmt":"2023-06-27T00:34:36","guid":{"rendered":"https:\/\/www.tunesbro.com\/blog\/?p=3018"},"modified":"2023-06-27T00:34:36","modified_gmt":"2023-06-27T00:34:36","slug":"what-is-nscd-service-in-linux","status":"publish","type":"post","link":"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/","title":{"rendered":"What Is Nscd Service in Linux?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_45_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"ez-toc-toggle-icon-1\"><label for=\"item-69fa4f3b8117f\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input  type=\"checkbox\" id=\"item-69fa4f3b8117f\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#Video_Tutorial_What_is_the_use_of_nscd_service_in_Linux\" title=\"Video Tutorial:What is the use of nscd service in Linux?\">Video Tutorial:What is the use of nscd service in Linux?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#Can_I_disable_nscd\" title=\"Can I disable nscd?\">Can I disable nscd?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#What_is_the_difference_between_nscd_and_Sssd_in_Linux\" title=\"What is the difference between nscd and Sssd in Linux?\">What is the difference between nscd and Sssd in Linux?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#How_to_restart_nscd_in_Linux\" title=\"How to restart nscd in Linux?\">How to restart nscd in Linux?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#How_to_clear_nscd_cache_in_Linux\" title=\"How to clear nscd cache in Linux?\">How to clear nscd cache in Linux?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#What_is_the_function_of_nscd_in_system_administration\" title=\"What is the function of nscd in system administration?\">What is the function of nscd in system administration?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/#How_can_we_avoid_nscd_for_DNS\" title=\"How can we avoid nscd for DNS?\">How can we avoid nscd for DNS?<\/a><\/li><\/ul><\/nav><\/div>\n<p>NSCD (Name Service Cache Daemon) is a service that runs on a Linux machine and provides caching for various system databases such as password, group, and host lookups. This service can improve system performance by reducing the time it takes for applications to retrieve information from these databases, as it stores previously looked-up information in memory for quick access. NSCD can be configured to cache different types of information for specific periods of time, and it can also be used to limit the number of connections to external services like LDAP. However, it&#8217;s worth noting that NSCD can cause issues with certain configurations or in situations where changes are made to the database without restarting the daemon. As such, it&#8217;s important to understand how NSCD works and how to properly configure it for your specific use case.<\/p>\n<lite-youtube videoid=\"Mr_raO2L0vY\" playlabel=\"Play: Keynote (Google I\/O '18)\"><\/lite-youtube>\n<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Video_Tutorial_What_is_the_use_of_nscd_service_in_Linux\"><\/span>Video Tutorial:What is the use of nscd service in Linux?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<lite-youtube videoid=\"vn6x1eQIk98\" playlabel=\"Play: Keynote (Google I\/O '18)\"><\/lite-youtube>\n<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Can_I_disable_nscd\"><\/span>Can I disable nscd?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NSCD stands for Name Service Cache Daemon. It is a service that is used to cache the results of directory queries in order to speed up the lookups. The service is used to cache the results of lookups for a variety of network services, including host names, user names, and group names.<\/p>\n<p>While disabling NSCD may not cause any immediate issues since the system will default to performing lookups by connecting to the appropriate servers, it is not recommended to disable this service. NSCD significantly speeds up directory queries and disabling it can lead to longer lookup times, which can cause issues with applications that rely heavily on network services.<\/p>\n<p>However, if you believe that disabling NSCD is necessary for your particular use case, it is recommended to thoroughly test the configuration beforehand and monitor the system for any issues that may arise as a result of disabling the service.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_nscd_and_Sssd_in_Linux\"><\/span>What is the difference between nscd and Sssd in Linux?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NSCD (Name Service Caching Daemon) and SSSD (System Security Services Daemon) are both used in Linux for caching and resolving user and system authentication data. However, they differ in functionality and purpose. <\/p>\n<p>NSCD is a lightweight daemon that caches name service requests, such as hostnames, user and group names, and passwords. It is commonly used in environments where the authentication and authorization data are distributed across multiple servers. NSCD caches the data locally, reducing the number of requests sent to the remote servers and making the system more responsive.<\/p>\n<p>SSSD, on the other hand, is a more comprehensive daemon that provides not only caching but also authentication and authorization services. It consolidates identity and authentication sources from various providers, including LDAP, Kerberos, and Active Directory. SSSD can cache user and group data, but it also allows for authentication and authorization policies to be applied across multiple domains and systems.<\/p>\n<p>So, in summary, while both NSCD and SSSD provide caching services, SSSD goes a step further by offering comprehensive authentication and authorization services and integrating with multiple identity sources.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_restart_nscd_in_Linux\"><\/span>How to restart nscd in Linux?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To restart nscd in Linux, you can use the following command: \"<strong>systemctl restart nscd.service<\/strong>\". Alternatively, you can also use the command \"<strong>service nscd restart<\/strong>\" but it depends on the Linux distribution you&#8217;re using. It is important to note that nscd stands for Name Service Cache Daemon, which is a system daemon that caches name service lookups for the local system. Restarting this service can be helpful in resolving certain issues related to name resolution, but it&#8217;s important to understand the implications of doing so before proceeding.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_clear_nscd_cache_in_Linux\"><\/span>How to clear nscd cache in Linux?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To clear the nscd (Name Service Cache Daemon) cache in Linux, you can run the command \"<strong>service nscd restart<\/strong>\" as the root user in your terminal. This will stop the nscd service, clear the cache, and then restart the service. Alternatively, you can use the command \"<strong>nscd -i hosts<\/strong>\" to only clear the cache for the hosts service. It is important to note that clearing the cache may temporarily slow down operations, as the cache will need to be rebuilt.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_the_function_of_nscd_in_system_administration\"><\/span>What is the function of nscd in system administration?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NSCD (Name Service Caching Daemon) is a system daemon in Linux and Unix-based operating systems that caches data related to name service lookups, such as host names, user names, and group names. The daemon helps reduce the load on a system&#8217;s name service, as cached entries can be retrieved more quickly than by querying the name service every time. NSCD is often used in combination with other name service mechanism like DNS, LDAP, and NIS. However, it is important to note that excessive caching may lead to outdated information, which can be resolved by flushing the cache or restarting the daemon.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_can_we_avoid_nscd_for_DNS\"><\/span>How can we avoid nscd for DNS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If you&#8217;re looking to avoid nscd for DNS, there are several alternative options available. One option is to use dnsmasq, which is a lightweight DNS and DHCP server. This option can improve performance and reduce system resource usage compared to nscd. Another option is to use systemd-resolved, which is a system daemon that provides network name resolution to local applications. Systemd-resolved can also cache DNS queries locally, similar to nscd.<\/p>\n<p>It&#8217;s worth noting that nscd is not inherently bad, and may still be the best option for certain use cases. However, if you&#8217;re experiencing issues with nscd or simply want to try a different DNS caching solution, both dnsmasq and systemd-resolved are viable alternatives to consider.<br \/>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Can I disable nscd?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NSCD stands for Name Service Cache Daemon. It is a service that is used to cache the results of directory queries in order to speed up the lookups. The service is used to cache the results of lookups for a variety of network services, including host names, user names, and group names.\\n\\nWhile disabling NSCD may not cause any immediate issues since the system will default to performing lookups by connecting to the appropriate servers, it is not recommended to disable this service. NSCD significantly speeds up directory queries and disabling it can lead to longer lookup times, which can cause issues with applications that rely heavily on network services.\\n\\nHowever, if you believe that disabling NSCD is necessary for your particular use case, it is recommended to thoroughly test the configuration beforehand and monitor the system for any issues that may arise as a result of disabling the service.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between nscd and Sssd in Linux?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NSCD (Name Service Caching Daemon) and SSSD (System Security Services Daemon) are both used in Linux for caching and resolving user and system authentication data. However, they differ in functionality and purpose. \\n\\nNSCD is a lightweight daemon that caches name service requests, such as hostnames, user and group names, and passwords. It is commonly used in environments where the authentication and authorization data are distributed across multiple servers. NSCD caches the data locally, reducing the number of requests sent to the remote servers and making the system more responsive.\\n\\nSSSD, on the other hand, is a more comprehensive daemon that provides not only caching but also authentication and authorization services. It consolidates identity and authentication sources from various providers, including LDAP, Kerberos, and Active Directory. 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However, it is important to note that excessive caching may lead to outdated information, which can be resolved by flushing the cache or restarting the daemon.\"}},{\"@type\":\"Question\",\"name\":\"How can we avoid nscd for DNS?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If you're looking to avoid nscd for DNS, there are several alternative options available. One option is to use dnsmasq, which is a lightweight DNS and DHCP server. This option can improve performance and reduce system resource usage compared to nscd. Another option is to use systemd-resolved, which is a system daemon that provides network name resolution to local applications. Systemd-resolved can also cache DNS queries locally, similar to nscd.\\n\\nIt's worth noting that nscd is not inherently bad, and may still be the best option for certain use cases. However, if you're experiencing issues with nscd or simply want to try a different DNS caching solution, both dnsmasq and systemd-resolved are viable alternatives to consider.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>NSCD (Name Service Cache Daemon) is a service that runs on a Linux machine and provides caching for various system databases such as password, group, and host lookups. This service can improve system performance by reducing the time it takes for applications to retrieve information from these databases, as it stores previously looked-up information in &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/\"> <span class=\"screen-reader-text\">What Is Nscd Service in Linux?<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[22],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Is Nscd Service In Linux?<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tunesbro.com\/blog\/what-is-nscd-service-in-linux\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is Nscd Service in Linux?\" \/>\n<meta property=\"og:description\" content=\"NSCD (Name Service Cache Daemon) is a service that runs on a Linux machine and provides caching for various system databases such as password, group, and host lookups. 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