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* Start iRedMail Configurations
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< INFO > Create self-signed SSL certification files.
< INFO > Create required system accounts: vmail, iredapd, iredadmin.
< INFO > Configure Apache web server and PHP.
< INFO > Configure MySQL database server.
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'
< INFO > Configure Postfix (Message Transfer Agent).
< INFO > Configure Policyd (postfix policy server, code name cluebringer).
< INFO > Configure Dovecot (pop3/imap/managesieve server, version 2).
< INFO > Configure ClamAV (anti-virus toolkit).
< INFO > Configure Amavisd-new (interface between MTA and content checkers).
< INFO > Configure SpamAssassin (content-based spam filter).
< INFO > Configure iRedAPD (postfix policy daemon).
< INFO > Configure iRedAdmin (official web-based admin panel).
< INFO > Configure Roundcube webmail.
< INFO > Configure phpMyAdmin (web-based MySQL management tool)

why
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'