Steps to join a linux computer to Active Directory using  AD.
Benefits of using SSSD:
Reduced load on authentication servers.
Option for offline authentication
Single user account

Steps:
1)Make sure that both the Active Directory and Linux systems have a properly configured environment
2)
On the Linux client, add the Active Directory domain to the client's DNS configuration so that it can resolve the domain's SRV records.
Search adserver.example.com
Nameserver 192.168.1.1

3)set up the linux system as an AD client and enroll it within the AD domain.
   1) set up the kerberos to use AD realm
         1) vim /etc/krb5.conf

          2) configure the logging and libdefaulrs section 

              [Logging]
               FILE: /var/logs/krb5libs.log
               [Libdefaults]
               Default_realm=example.com
               Dns_lookup_realm=true
               Dns_lookup_kdc = true
               Ticket_lifetime=24h
               Renew_lifetime=7d
               Rdns = false
               Forwardable = yes