{"id":16066,"date":"2024-10-29T12:50:03","date_gmt":"2024-10-29T12:50:03","guid":{"rendered":"https:\/\/truehost.com\/support\/?post_type=docs&#038;p=16066"},"modified":"2024-10-30T06:35:59","modified_gmt":"2024-10-30T06:35:59","password":"","slug":"managing-users-and-groups-on-a-linux-server-best-practices","status":"publish","type":"docs","link":"https:\/\/truehost.com\/support\/knowledge-base\/managing-users-and-groups-on-a-linux-server-best-practices\/","title":{"rendered":"Managing Users and Groups on a Linux Server: Best Practices"},"content":{"rendered":"\n<p>Effective user and group management is essential to maintaining security, efficiency, and organization on a Linux server. <\/p>\n\n\n\n<p>With proper user and group configurations, administrators can ensure that users have appropriate access levels and permissions, keeping sensitive data protected and minimizing the risk of accidental or malicious actions.<\/p>\n\n\n\n<p>Here\u2019s a look at best practices for managing users and groups on Linux.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>1. Understanding User and Group Basics<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In Linux, every user has a unique user ID (UID), while groups have group IDs (GID). Users can belong to multiple groups, each with specific permissions, allowing for flexible access control across the system.\n<ul class=\"wp-block-list\">\n<li><strong>User<\/strong>: A unique identity on the system with a username and UID.<\/li>\n\n\n\n<li><strong>Group<\/strong>: A collection of users with a GID, allowing shared permissions.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Linux uses three categories of permissions: <strong>owner<\/strong> (user), <strong>group<\/strong>, and <strong>others<\/strong>, which can be adjusted for files, directories, and commands to control access.<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>2. Creating and Managing Users<\/strong><\/h5>\n\n\n\n<p><strong>Add New Users<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It\u2019s crucial to follow a consistent naming convention and avoid adding unnecessary users to sensitive groups like <code>sudo<\/code> or <code>root<\/code>.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To add a new user, use the command below;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>This command creates a new user with default settings, including a home directory.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo adduser &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"592\" height=\"216\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-612.png\" alt=\"\" class=\"wp-image-16074\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-612.png 592w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-612-300x109.png 300w\" sizes=\"auto, (max-width: 592px) 100vw, 592px\" \/><\/figure>\n\n\n\n<p><strong>Use <code>useradd<\/code> for Custom Options<\/strong><\/p>\n\n\n\n<p>For custom configurations, <code>useradd<\/code> allows greater flexibility. You can specify custom home directories, shell types, and other user-specific settings.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo useradd -m -d \/custom\/home -s \/bin\/bash -c \"User Description\" &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"977\" height=\"56\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-613.png\" alt=\"\" class=\"wp-image-16077\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-613.png 977w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-613-300x17.png 300w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-613-768x44.png 768w\" sizes=\"auto, (max-width: 977px) 100vw, 977px\" \/><\/figure>\n\n\n\n<p><strong>User Passwords and Expiration<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Set strong passwords for all user accounts and enforce password policies to enhance security:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo passwd &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"699\" height=\"105\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-614.png\" alt=\"\" class=\"wp-image-16079\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-614.png 699w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-614-300x45.png 300w\" sizes=\"auto, (max-width: 699px) 100vw, 699px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To set password expiration for regular password changes:<\/li>\n\n\n\n<li>Int he command below, 90 represents the number of days that the password will be valid.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chage -M 90 &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"782\" height=\"97\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-615.png\" alt=\"\" class=\"wp-image-16081\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-615.png 782w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-615-300x37.png 300w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-615-768x95.png 768w\" sizes=\"auto, (max-width: 782px) 100vw, 782px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>After 90 days, the password will expire, and the user will be prompted to update it at their next login.<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>3. Managing Groups for Access Control<\/strong><\/h5>\n\n\n\n<p><strong>Create and Assign Groups<\/strong><\/p>\n\n\n\n<p>Grouping users simplifies permission management, especially for multi-user environments. To create a new group:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo groupadd &#91;groupname]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"122\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-616.png\" alt=\"\" class=\"wp-image-16086\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-616.png 605w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-616-300x60.png 300w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><\/figure>\n\n\n\n<p>To add a user to a group:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo usermod -aG &#91;groupname] &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"944\" height=\"144\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-617.png\" alt=\"\" class=\"wp-image-16087\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-617.png 944w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-617-300x46.png 300w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-617-768x117.png 768w\" sizes=\"auto, (max-width: 944px) 100vw, 944px\" \/><\/figure>\n\n\n\n<p><strong>Note: <\/strong><\/p>\n\n\n\n<p>System groups, like <code>sudo<\/code>, <code>www-data<\/code>, and <code>docker<\/code>, come pre-configured with specific permissions. Only assign users to system groups if they need that level of access.<\/p>\n\n\n\n<p><strong>Verify Group Memberships<\/strong><\/p>\n\n\n\n<p>To check a user\u2019s group memberships:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>groups &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"890\" height=\"141\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-618.png\" alt=\"\" class=\"wp-image-16088\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-618.png 890w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-618-300x48.png 300w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-618-768x122.png 768w\" sizes=\"auto, (max-width: 890px) 100vw, 890px\" \/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>4. Configuring Permissions with <code>chmod<\/code>, <code>chown<\/code>, and <code>chgrp<\/code><\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Permissions control access to files and directories. Set proper permissions to reduce the risk of accidental or malicious data access.<\/li>\n<\/ul>\n\n\n\n<p><strong>chmod: Modifies permissions for the user, group, and others.<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chmod 750 &#91;filename] # rwxr-x---<\/code><\/pre>\n\n\n\n<p><strong>chown: Changes ownership of files to a specific user.<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chown &#91;user]:&#91;group] &#91;filename]<\/code><\/pre>\n\n\n\n<p><strong>chgrp: Changes the group ownership of a file.<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chgrp &#91;group] &#91;filename]<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You could check <strong><a href=\"https:\/\/truehost.com\/support\/knowledge-base\/managing-users-and-groups-on-a-linux-server-best-practices\/\" target=\"_blank\" rel=\"noreferrer noopener\">this article<\/a><\/strong> for more information regarding users and groups<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>5. Restricting Root Access<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root access should be limited to essential administrative tasks only. Avoid giving users access to the root account and consider using sudo to elevate permissions temporarily.<\/li>\n\n\n\n<li>You can check <strong><a href=\"https:\/\/truehost.com\/support\/knowledge-base\/how-to-disable-root-ssh-completely\/\" target=\"_blank\" rel=\"noreferrer noopener\">this article<\/a><\/strong> on how to do that<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>6. Lock and Disable Accounts as Needed<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For security, disable or lock user accounts when they\u2019re no longer active, such as after an employee leaves. This prevents unauthorized access without deleting user data.<\/li>\n<\/ul>\n\n\n\n<p><strong>Lock an account:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo usermod -L &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"761\" height=\"58\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-622.png\" alt=\"\" class=\"wp-image-16100\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-622.png 761w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-622-300x23.png 300w\" sizes=\"auto, (max-width: 761px) 100vw, 761px\" \/><\/figure>\n\n\n\n<p><strong>Unlock an account:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo usermod -U &#91;username]<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"682\" height=\"61\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-623.png\" alt=\"\" class=\"wp-image-16101\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-623.png 682w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-623-300x27.png 300w\" sizes=\"auto, (max-width: 682px) 100vw, 682px\" \/><\/figure>\n\n\n\n<p><strong>Expire an account immediately:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chage -E 0 &#91;username]<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>7. Audit User Activity and Monitor Access<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use system logs to audit user activity, including login times, sudo usage, and access to critical files.<\/li>\n\n\n\n<li>The <code>\/var\/log\/auth.log<\/code> or <code>\/var\/log\/secure<\/code> files (depending on your distribution) track authentication events and are valuable for security auditing.<\/li>\n<\/ul>\n\n\n\n<p><strong>Monitor login attempts:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo lastlog<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"987\" height=\"385\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-619.png\" alt=\"\" class=\"wp-image-16096\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-619.png 987w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-619-300x117.png 300w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-619-768x300.png 768w\" sizes=\"auto, (max-width: 987px) 100vw, 987px\" \/><\/figure>\n\n\n\n<p><strong>View failed login attempts:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo cat \/var\/log\/auth.log | grep \"Failed password\"<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large is-style-zoooom\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"251\" src=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-620-1024x251.png\" alt=\"\" class=\"wp-image-16097\" srcset=\"https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-620-1024x251.png 1024w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-620-300x74.png 300w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-620-768x188.png 768w, https:\/\/truehost.com\/support\/wp-content\/uploads\/2024\/10\/image-620.png 1231w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>8. Enable Account Policies for Security &#8211; Optional Step<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Account policies help enforce security best practices, such as password complexity, password aging, and login limits.<\/li>\n<\/ul>\n\n\n\n<p><strong>Use <code>pam<\/code> for Security Policies<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Linux\u2019s Pluggable Authentication Modules (PAM) allow you to configure password and account policies. To set password complexity:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vi \/etc\/pam.d\/common-password<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Add <code>minlen<\/code>, <code>ucredit<\/code>, <code>lcredit<\/code>, <code>dcredit<\/code>, and <code>ocredit<\/code> parameters to enforce complex passwords.<\/li>\n<\/ul>\n\n\n\n<p><strong>Configure Login Limits<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Set login attempt limits to protect against brute-force attacks:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vi \/etc\/security\/limits.conf<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Define <code>hard<\/code> and <code>soft<\/code> limits for various resources, like the maximum number of processes and open files.<\/li>\n<\/ul>\n\n\n\n<p><strong>9. Document User and Group Policies<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>These steps can be so many that you end up not recalling all the configurations that were you did. Maintaining clear documentation on user and group policies helps keep everyone informed and simplifies future administration. <\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Documentation should include:\n<ul class=\"wp-block-list\">\n<li>Naming conventions<\/li>\n\n\n\n<li>Group structures and access levels<\/li>\n\n\n\n<li>Account creation, deletion, and disabling procedures<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Author&#8217;s Final thoughts<\/h2>\n\n\n\n<p>Effective management of users and groups in Linux is critical to server security, organization, and accessibility. <\/p>\n\n\n\n<p>By following these best practices, administrators can ensure that only authorized users have the appropriate access, reducing the risk of security incidents while maintaining a well-organized server environment. <\/p>\n\n\n\n<p>Proper documentation, monitoring, and regular audits help make user management easier, enhancing security and enabling smooth server operations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Effective user and group management is essential to maintaining security, efficiency, and organization on a Linux server. With proper user and group configurations, administrators can ensure that users have appropriate access levels and permissions, keeping sensitive data protected and minimizing the risk of accidental or malicious actions. Here\u2019s a look at best practices for managing [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_eb_attr":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"doc_category":[1820,1824,1879,2128],"doc_tag":[],"class_list":["post-16066","docs","type-docs","status-publish","hentry","doc_category-cloud-servers-in-kenya","doc_category-dedicated-servers","doc_category-servers","doc_category-vps-servers"],"year_month":"2026-07","word_count":836,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"Eugene","author_nicename":"eugene","author_url":"https:\/\/truehost.com\/support\/author\/eugene\/"},"doc_category_info":[{"term_name":"Cloud servers in Kenya","term_url":"https:\/\/truehost.com\/support\/docs-category\/cloud-servers-in-kenya\/"},{"term_name":"dedicated servers","term_url":"https:\/\/truehost.com\/support\/docs-category\/dedicated-servers\/"},{"term_name":"Servers","term_url":"https:\/\/truehost.com\/support\/docs-category\/servers\/"},{"term_name":"VPS-Servers","term_url":"https:\/\/truehost.com\/support\/docs-category\/vps-servers\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Managing Users and Groups on a Linux Server: Best Practices -<\/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:\/\/truehost.com\/support\/knowledge-base\/managing-users-and-groups-on-a-linux-server-best-practices\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Managing Users and Groups on a Linux Server: Best Practices -\" \/>\n<meta property=\"og:description\" content=\"Effective user and group management is essential to maintaining security, efficiency, and organization on a Linux server. With proper user and group configurations, administrators can ensure that users have appropriate access levels and permissions, keeping sensitive data protected and minimizing the risk of accidental or malicious actions. 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