MySQL Server File Locations on CentOS

Provides a tutorial example on how to find and view MySQL Server file locations for MySQL 8.0 server on CentOS 8 systems.

In order to properly maintain MySQL server, you need to know how and where MySQL server stores its files. As an example, here are the locations of MySQL server files on my CentOS 8 computer:

1. MySQL command program files are stored in 2 directories:

herong$ ls -l /usr/sbin | grep mysql
lrwxrwxrwx. 1 root root        19 Oct  8 09:34 mysqld -> /usr/libexec/mysqld

herong$ ls -l /usr/bin | grep mysql
-rwxr-xr-x. 1 root root     7703224 Oct  8 09:37 mysql
-rwxr-xr-x. 1 root root     7474568 Oct  8 09:37 mysqladmin
-rwxr-xr-x. 1 root root     8198496 Oct  8 09:37 mysqlbinlog
-rwxr-xr-x. 1 root root     7495776 Oct  8 09:37 mysqlcheck
-rwxr-xr-x. 1 root root      674528 Oct  8 09:37 mysql_config_editor
-rwxr-xr-x. 1 root root        4392 Oct  8 09:24 mysqld_pre_systemd
-rwxr-xr-x. 1 root root     7587512 Oct  8 09:37 mysqldump
-rwxr-xr-x. 1 root root        7690 Oct  8 09:24 mysqldumpslow
-rwxr-xr-x. 1 root root     7473216 Oct  8 09:37 mysqlimport
-rwxr-xr-x. 1 root root     8380208 Oct  8 09:37 mysqlpump
-rwxr-xr-x. 1 root root     7458664 Oct  8 09:37 mysql_secure_installation
-rwxr-xr-x. 1 root root     7467968 Oct  8 09:37 mysqlshow
-rwxr-xr-x. 1 root root     7497168 Oct  8 09:37 mysqlslap
-rwxr-xr-x. 1 root root      733424 Oct  8 09:37 mysql_ssl_rsa_setup
-rwxr-xr-x. 1 root root      541152 Oct  8 09:37 mysql_tzinfo_to_sql
-rwxr-xr-x. 1 root root     7656336 Oct  8 09:37 mysql_upgrade

2. MySQL server data and log files are located at /var/lib/mysql. Each database is stored a separate sub-directory:

herong$ ls -l /var/lib/mysql
total 188988
-rw-r-----. 1 mysql mysql       56 Mar 26 22:02  auto.cnf
-rw-r-----. 1 mysql mysql 18315580 Mar 27 05:49  binlog.000001
-rw-r-----. 1 mysql mysql      178 Mar 27 06:13  binlog.000002
-rw-r-----. 1 mysql mysql     9995 Mar 28 08:14  binlog.000003
-rw-r-----. 1 mysql mysql     2785 Mar 28 08:33  binlog.000004
-rw-r-----. 1 mysql mysql       64 Mar 28 08:15  binlog.index
-rw-------. 1 mysql mysql     1680 Mar 26 22:02  ca-key.pem
-rw-r--r--. 1 mysql mysql     1112 Mar 26 22:02  ca.pem
-rw-r--r--. 1 mysql mysql     1112 Mar 26 22:02  client-cert.pem
-rw-------. 1 mysql mysql     1676 Mar 26 22:02  client-key.pem
-rw-r-----. 1 mysql mysql     4188 Mar 28 08:14  ib_buffer_pool
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:34  ibdata1
-rw-r-----. 1 mysql mysql 50331648 Mar 28 08:34  ib_logfile0
-rw-r-----. 1 mysql mysql 50331648 Mar 26 22:01  ib_logfile1
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:15  ibtmp1
drwxr-x---. 2 mysql mysql      187 Mar 28 08:15 '#innodb_temp'
drwxr-x---. 2 mysql mysql      143 Mar 26 22:02  mysql
-rw-r-----. 1 mysql mysql 24117248 Mar 28 08:33  mysql.ibd
srwxrwxrwx. 1 mysql mysql        0 Mar 28 08:15  mysql.sock
-rw-------. 1 mysql mysql        5 Mar 28 08:15  mysql.sock.lock
-rw-r--r--. 1 mysql mysql        7 Mar 26 22:02  mysql_upgrade_info
srwxrwxrwx. 1 mysql mysql        0 Mar 28 08:15  mysqlx.sock
-rw-------. 1 mysql mysql        6 Mar 28 08:15  mysqlx.sock.lock
drwxr-x---. 2 mysql mysql     8192 Mar 26 22:02  performance_schema
-rw-------. 1 mysql mysql     1676 Mar 26 22:02  private_key.pem
-rw-r--r--. 1 mysql mysql      452 Mar 26 22:02  public_key.pem
-rw-r--r--. 1 mysql mysql     1112 Mar 26 22:02  server-cert.pem
-rw-------. 1 mysql mysql     1680 Mar 26 22:02  server-key.pem
drwxr-x---. 2 mysql mysql       28 Mar 26 22:02  sys
drwxr-x---. 2 mysql mysql      181 Mar 27 02:00  test
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:33  undo_001
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:32  undo_002

Table of Contents

 About This Book

 Introduction to Linux Systems

 Cockpit - Web Portal for Administrator

 Process Management

 Files and Directories

 Users and Groups

 File Systems

 Block Devices and Partitions

 LVM (Logical Volume Manager)

 Installing CentOS

 SELinux - Security-Enhanced Linux

 Network Connection on CentOS

 Software Package Manager on CentOS - DNF and YUM

 Running Apache Web Server (httpd) on Linux Systems

 Running PHP Scripts on Linux Systems

Running MySQL Database Server on Linux Systems

 Install MySQL Database Server on CentOS

 Manage MySQL Server 'mysqld' on CentOS

 Set MySQL Server "root" Password on CentOS

MySQL Server File Locations on CentOS

 MySQL Server Data Backups on CentOS

 MySQL Server Log Files on CentOS

 MySQL Server Socket Connection on CentOS

 MySQL Server TCP/IP Connection on CentOS

 Open Firewall for MySQL Server on CentOS

 "Server sent charset unknown to the client" Error

 Performance of Inserting Integers to MySQL Database

 Performance Comparison of Inserting Integers vs. Strings

 Running Python Scripts on Linux Systems

 vsftpd - Very Secure FTP Daemon

 Postfix - Mail Transport Agent (MTA)

 Dovecot - IMAP and POP3 Server

 Email Client Tools - Mail User Agents (MUA)

 LDAP (Lightweight Directory Access Protocol)

 GCC - C/C++ Compiler

 Graphics Environments on Linux

 Conda - Environment and Package Manager

 Tools and Utilities

 Administrative Tasks

 References

 Full Version in PDF/EPUB