Added testing script to join domains on ubuntu 20

ubuntis20-domainjoiner.sh

@@ -0,0 +1,81 @@
+#/bin/bash
+##ubuntis 20 domain joiner extraordainer
+
+# Function to display usage
+usage() {
+  echo "Usage: $0 --hostname HOSTNAME --user USERNAME --realm REALM"
+  echo
+  echo "Options:"
+  echo "  --hostname Specify the server hostname"
+  echo "  --user     Specify the username"
+  echo "  --realm    Specify the realm (e.g., 45drives.local)"
+  exit 1
+}
+
+# If no arguments passed, show usage
+[[ $# -eq 0 ]] && usage
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --hostname)
+      HOSTNAME="$2"
+      shift 2
+      ;;
+    --user)
+      USERNAME="$2"
+      shift 2
+      ;;
+    --realm)
+      REALM="$2"
+      shift 2
+      ;;
+    *)
+      echo "Unknown option: $1"
+      usage
+      ;;
+  esac
+done
+
+# Validate required variables
+if [[ -z "$HOSTNAME" || -z "$USERNAME" || -z "$REALM" ]]; then
+  echo "Error: --user and --realm arguments are required."
+  usage
+fi
+
+# Force the realm to uppercase
+REALM="${REALM^^}"
+
+# Now do something with $USERNAME and $REALM
+echo "Username: $USERNAME"
+echo "Realm:    $REALM"
+
+
+echo "Installing prerequisite packages: realmd, samba, krb5-user....."
+apt install realmd samba krb5-user
+echo "setting hostname to:" $HOSTNAME.REALM
+hostnamectl set-hostname $HOSTNAME.$REALM
+currentTimestamp=`date +%y-%m-%d-%H:%M:%S`
+echo "Backing up existing samba conf to:" /etc/samba/smb.conf.$currentTimestamp.bak
+mv /etc/samba/smb.conf /etc/samba/smb.conf.$currentTimestamp.bak
+echo "Generating kerberos ticket, please enter password at the prompt....."
+kinit $USERNAME@$REALM
+echo "Validating we can discover the domain....."
+realm discover $REALM
+echo "Joining the domain....."
+realm join --user=$USERNAME --membership-software=samba --client-software=winbind --server-software=active-directory $REALM
+echo "Outputting domain join validation....."
+realm list
+echo "Configuring smb.conf to use net registry"
+echo include = registry >> /etc/samba/smb.conf
+echo "Updating /etc/nsswitch.conf to use winbind"
+sed -i -E '/^(passwd|group):/ s/\bsss\b/winbind/g' /etc/nsswitch.conf
+echo "Configuring /etc/krb.conf"
+cat <<EOF
+[libdefaults]
+	default_realm = $REALM
+	dns_lookup_realm = false
+	dns_lookup_kdc = true
+EOF
+pam-auth-update --enable mkhomedir
+systemctl enable --now smbd