Linux下的MySQL服務需要通過配置文件進行設置以實現其正常運行，并且MySQL的配置文件位于/etc/my.cnf中。

下面是一個典型的MySQL配置文件：

# For advice on how to change settings please see
# https://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
skip-name-resolve
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

在/etc/my.cnf配置文件中，我們需要指定下列幾項配置：

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
symbolic-links=0   //是否啟用符號連接
log-error=/var/log/mysqld.log  //指定錯誤日志的位置
pid-file=/var/run/mysqld/mysqld.pid  //指定PID文件的位置

這是MySQL的基本配置，如果需要更改其他的高級設置，可以通過修改配置文件實現，同時也可以參考MySQL的官方文檔進行自定義配置。