How to regain access to myql server and dump database?

cgasp asked:

We retake the management of our server and now we need to make some reverse engineering. We gave to an external company the development of our new Website and they need a dump of database from old site.

The Webserver is on Debian with Apache and MySQL running. I locate the server running on localhost port 3306. The server is on production.

Tried a “longshot” mysqldump :

web:/home/user# mysqldump -P 3306 -h localhost -u root -p db
Enter password: 
-- MySQL dump 10.11
--
-- Host: localhost    Database: db
-- ------------------------------------------------------
-- Server version       5.0.32-Debian_7etch12-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
mysqldump: Got error: 1049: Unknown database 'db' when selecting the database

I have the root access to the machine.
Here my questions:

How can I retrieve the information about the existing databases ?
How can I retrieve access to it (user/pass) ?
How can I make a proper dump ?

My answer:


The database is obviously not named db.

Why don’t you just dump all databases?

mysqldump --all-databases ......

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