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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (How To Identify That The Linux Server Is Integrated With Active Directory (AD)?)
+[#]: via: (https://www.2daygeek.com/how-to-identify-that-the-linux-server-is-integrated-with-active-directory-ad/)
+[#]: author: (Vinoth Kumar https://www.2daygeek.com/author/vinoth/)
+
+How To Identify That The Linux Server Is Integrated With Active Directory (AD)?
+======
+
+Single Sign On (SSO) Authentication is an implemented in most of the organizations due to multiple applications access.
+
+It allows a user to logs in with a single ID and password to all the applications which is available in the organization.
+
+It uses a centralized authentication system for all the applications.
+
+A while ago we had written an article, **[how to integrate Linux system with AD][1]**.
+
+Today we are going to show you, how to check that the Linux system is integrated with AD using multiple ways.
+
+It can be done in four ways and we will explain one by one.
+
+  * **`ps Command:`** It report a snapshot of the current processes.
+  * **`id Command:`** It prints user identity.
+  * **`/etc/nsswitch.conf file:`** It is Name Service Switch configuration file.
+  * **`/etc/pam.d/system-auth file:`** It is Common configuration file for PAMified services.
+
+
+
+### How To Identify That The Linux Server Is Integrated With AD Using PS Command?
+
+ps command displays information about a selection of the active processes.
+
+To integrate the Linux server with AD, we need to use either `winbind` or `sssd` or `ldap` service.
+
+So, use the ps command to filter these services.
+
+If you found any of these services is running on system then we can decide that the system is currently integrate with AD using “winbind” or “sssd” or “ldap” service.
+
+You might get the output similar to below if the system is integrated with AD using `SSSD` service.
+
+```
+# ps -ef | grep -i "winbind\|sssd"
+
+root 29912 1 0 2017 ? 00:19:09 /usr/sbin/sssd -f -D
+root 29913 29912 0 2017 ? 04:36:59 /usr/libexec/sssd/sssd_be --domain 2daygeek.com --uid 0 --gid 0 --debug-to-files
+root 29914 29912 0 2017 ? 00:29:28 /usr/libexec/sssd/sssd_nss --uid 0 --gid 0 --debug-to-files
+root 29915 29912 0 2017 ? 00:09:19 /usr/libexec/sssd/sssd_pam --uid 0 --gid 0 --debug-to-files
+root 31584 26666 0 13:41 pts/3 00:00:00 grep sssd
+```
+
+You might get the output similer to below if the system is integrated with AD using `winbind` service.
+
+```
+# ps -ef | grep -i "winbind\|sssd"
+
+root 676 21055 0 2017 ? 00:00:22 winbindd
+root 958 21055 0 2017 ? 00:00:35 winbindd
+root 21055 1 0 2017 ? 00:59:07 winbindd
+root 21061 21055 0 2017 ? 11:48:49 winbindd
+root 21062 21055 0 2017 ? 00:01:28 winbindd
+root 21959 4570 0 13:50 pts/2 00:00:00 grep -i winbind\|sssd
+root 27780 21055 0 2017 ? 00:00:21 winbindd
+```
+
+### How To Identify That The Linux Server Is Integrated With AD Using id Command?
+
+It Prints information for given user name, or the current user. It displays the UID, GUID, User Name, Primary Group Name and Secondary Group Name, etc.,
+
+If the Linux system is integrated with AD then you might get the output like below. The GID clearly shows that the user is coming from AD “domain users”.
+
+```
+# id daygeek
+
+uid=1918901106(daygeek) gid=1918900513(domain users) groups=1918900513(domain users)
+```
+
+### How To Identify That The Linux Server Is Integrated With AD Using nsswitch.conf file?
+
+The Name Service Switch (NSS) configuration file, `/etc/nsswitch.conf`, is used by the GNU C Library and certain other applications to determine the sources from which to obtain name-service information in a range of categories, and in what order. Each category of information is identified by a database name.
+
+You might get the output similar to below if the system is integrated with AD using `SSSD` service.
+
+```
+# cat /etc/nsswitch.conf | grep -i "sss\|winbind\|ldap"
+
+passwd: files sss
+shadow: files sss
+group: files sss
+services:   files sss
+netgroup: files sss
+automount: files sss
+```
+
+You might get the output similar to below if the system is integrated with AD using `winbind` service.
+
+```
+# cat /etc/nsswitch.conf | grep -i "sss\|winbind\|ldap"
+
+passwd: files [SUCCESS=return] winbind
+shadow: files [SUCCESS=return] winbind
+group: files [SUCCESS=return] winbind
+```
+
+You might get the output similer to below if the system is integrated with AD using `ldap` service.
+
+```
+# cat /etc/nsswitch.conf | grep -i "sss\|winbind\|ldap"
+
+passwd: files ldap
+shadow: files ldap
+group: files ldap
+```
+
+### How To Identify That The Linux Server Is Integrated With AD Using system-auth file?
+
+It is Common configuration file for PAMified services.
+
+PAM stands for Pluggable Authentication Module that provides dynamic authentication support for applications and services in Linux.
+
+system-auth configuration file is provide a common interface for all applications and service daemons calling into the PAM library.
+
+The system-auth configuration file is included from nearly all individual service configuration files with the help of the include directive.
+
+You might get the output similar to below if the system is integrated with AD using `SSSD` service.
+
+```
+# cat /etc/pam.d/system-auth | grep -i "pam_sss.so\|pam_winbind.so\|pam_ldap.so"
+or
+# cat /etc/pam.d/system-auth-ac | grep -i "pam_sss.so\|pam_winbind.so\|pam_ldap.so"
+
+auth sufficient pam_sss.so use_first_pass
+account [default=bad success=ok user_unknown=ignore] pam_sss.so
+password sufficient pam_sss.so use_authtok
+session optional pam_sss.so
+```
+
+You might get the output similar to below if the system is integrated with AD using `winbind` service.
+
+```
+# cat /etc/pam.d/system-auth | grep -i "pam_sss.so\|pam_winbind.so\|pam_ldap.so"
+or
+# cat /etc/pam.d/system-auth-ac | grep -i "pam_sss.so\|pam_winbind.so\|pam_ldap.so"
+
+auth sufficient pam_winbind.so cached_login use_first_pass
+account [default=bad success=ok user_unknown=ignore] pam_winbind.so cached_login
+password sufficient pam_winbind.so cached_login use_authtok
+```
+
+You might get the output similar to below if the system is integrated with AD using `ldap` service.
+
+```
+# cat /etc/pam.d/system-auth | grep -i "pam_sss.so\|pam_winbind.so\|pam_ldap.so"
+or
+# cat /etc/pam.d/system-auth-ac | grep -i "pam_sss.so\|pam_winbind.so\|pam_ldap.so"
+
+auth sufficient pam_ldap.so cached_login use_first_pass
+account [default=bad success=ok user_unknown=ignore] pam_ldap.so cached_login
+password sufficient pam_ldap.so cached_login use_authtok
+```
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/how-to-identify-that-the-linux-server-is-integrated-with-active-directory-ad/
+
+作者：[Vinoth Kumar][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.2daygeek.com/author/vinoth/
+[b]: https://github.com/lujun9972
+[1]: https://www.2daygeek.com/join-integrate-rhel-centos-linux-system-to-windows-active-directory-ad-domain/