1. Checking for cacti location and see db setting.

monitor# pwd

/usr/local/share/cacti/include

see setting dbnya.

monitor# cat db-settings.php

<?php
/* make sure these values refect your actual database/host/user/password */
$database_type = “mysql”;
$database_default = “cacti”;
$database_hostname = “localhost”;
$database_username = “cacti”;
$database_password = “cacti”;
$database_port = “3306″;
?>

2. Enter database with information taken from db-settings.php information.

monitor# mysql -ucacti -p

Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8343
Server version: 5.0.45 FreeBSD port: mysql-server-5.0.45_1

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.

mysql>

mysql> use cacti;

Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select * from auth_user;

ERROR 1146 (42S02): Table ‘cacti.auth_user’ doesn’t exist

Ups, my bad

mysql> select * from user_auth;

+—-+———-+————-———————+——-+—————+————–——–+———–+———–+————–+—————-+————+—————+————–+———–—+————————+
| id | username | password                         | realm | full_name     | must_change_password | show_tree | show_list | show_preview | graph_settings | login_opts | policy_graphs | policy_trees | policy_hosts | policy_graph_templates |
+—-+———-+————-———————+——-+—————+————–——–+———–+———–+————–+—————-+————+—————+————–+———–—+————————+
|  1 | admin    | 7a40008b8368b684bec2286db1b073e2 |     0 | Administrator |                      | on        | on        | on           | on             |          1 |             1 |            1 |            1 |                      1 |
|  3 | monitor  | 719daab8833968dc805a345c58545ea6 |     0 | monitoring    |                      | on        | on        | on           | on             |          3 |             1 |            1 |            1 |                      1 |
|  7 | crash    | ac43724f16e9241d990427ab7c8f4228 |     0 | Nsun T        |                      | on        | on        | on           | on             |          3 |             1 |            1 |            1 |                      1 |
+—-+———-+————-———————+——-+—————+————–——–+———–+———–+————–+—————-+————+—————+————–+———–—+————————+
3 rows in set (0.00 sec)

mysql>exit

3. Generate new password with md5 utility.

monitor# md5 -s mypassword

MD5 (”mypassword”) = 34819d7beeabb9260a5c854bc85b3e44

4. Update database value with new created password string.

monitor# mysql -ucacti -p

Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8344
Server version: 5.0.45 FreeBSD port: mysql-server-5.0.45_1

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.

mysql>
mysql> update user_auth set password=’34819d7beeabb9260a5c854bc85b3e44′ where username=’admin’;

ref : http://www.rasyid.net/2008/04/13/reset-cacti-password-step-by-step/

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