Ubuntu下面MySQL的参数文件my.cnf浅析

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了Ubuntu下面MySQL的参数文件my.cnf浅析，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含6648字，纯文字阅读大概需要10分钟。

内容图文

前几天刚接手一个 MySQL 数据，操作系统为Ubuntu 16.04.5 LTS， 数据库版本为 5.7.23-0ubuntu0.16.04.1（APT方式安装的MySQL）。这个操作系统下的 MySQL 的配置文件 my.cnf 很多地方都让人有点不适应（跟之前的 MySQL 环境有些出入，之前都是维护 RHEL、CentOS 等操作系统环境下的 MySQL）。遂研究总结了一下。具体如下所示：

root@mylnx12:~# find / -name "my.cnf"
/etc/alternatives/my.cnf
/etc/mysql/my.cnf
/var/lib/dpkg/alternatives/my.cnf
root@mylnx12:~# locate my.cnf
/etc/alternatives/my.cnf
/etc/mysql/my.cnf
/etc/mysql/my.cnf.fallback
/var/lib/dpkg/alternatives/my.cnf
root@mylnx12:~# mysql --help | grep my.cnf
                      order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf 
root@mylnx12:~#  mysqld --verbose --help | grep -A 1 ‘Default options‘
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf

从上面这些信息判断，MySQL 的参数文件为 /etc/mysql/my.cnf， 但是其他几个 my.cnf 又是什么情况呢？

root@mylnx12:~# ls -lrt /etc/alternatives/my.cnf
lrwxrwxrwx 1 root root 20 Sep 28 16:28 /etc/alternatives/my.cnf -> /etc/mysql/mysql.cnf

从上面信息可以看出，/etc/alternatives/my.cnf 其实是一个软连接，指向参数文件 /etc/mysql/mysql.cnf

root@mylnx12:~# cat /var/lib/dpkg/alternatives/my.cnf
auto
/etc/mysql/my.cnf

/etc/mysql/my.cnf.fallback
100
/etc/mysql/mysql.cnf
200

光从上面这些信息，我们还看不出 /var/lib/dpkg/alternatives/my.cnf 与其它配置文件 my.cnf 是什么关系。那么我们先来看看参数文件 /etc/mysql/my.cnf，从下面信息，可以看出 “/etc/mysql/my.cnf” 是全局配置，“~/.my.cnf” 隐藏文件是个人用户设置。

root@mylnx12:~# cat /etc/mysql/my.cnf
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
# 
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with ‘.cnf‘, otherwise they‘ll be ignored.
#

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

但是 /etc/mysql/my.cnf 参数文件下面没有任何参数设置，只看到下面两行设置，表示导入这两个目录里面的配置文件。

!includedir /etc/mysql/conf.d/
 # 表示包含 /etc/mysql/conf.d/ 这个路径下面的配置文件，前提是必须以为 .cnf 为后缀

!includedir /etc/mysql/mysql.conf.d/

表示包含 /etc/mysql/mysql.conf.d/ 这个路径下面的配置文件，前提是必须以为 .cnf 为后缀

其实MySQL的相关配置都位于 mysqld.cnf（/etc/mysql/mysql.conf.d/mysqld.cnf）下面。使用相关参数测试了一下，确实都能生效。这种设置确实有点让刚接触的人有点不适应。暂时先总结到此！

root@mylnx12:~# cd /etc/mysql/mysql.conf.d/
root@mylnx12:/etc/mysql/mysql.conf.d# ls -lrt
total 8
-rw-r--r-- 1 root root   21 Feb  4  2017 mysqld_safe_syslog.cnf
-rw-r--r-- 1 root root 3148 Oct  6 23:34 mysqld.cnf
root@mylnx12:/etc/mysql/mysql.conf.d# cat mysqld.cnf
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
# 
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]
#
# * Basic Settings
#
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
log_bin        =  mylnx12_bin
server_id      = 0
character-set-server=utf8mb4
collation-server=utf8mb4_general_ci

#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address            = 10.21.6.7
#
# * Fine Tuning
#
key_buffer_size         = 16M
max_allowed_packet      = 100M
thread_stack            = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover-options  = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit       = 1M
query_cache_size        = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1
#
# Error log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries       = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id              = 1
#log_bin                        = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size   = 100M
#binlog_do_db           = include_database_name
#binlog_ignore_db       = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
#: ssl-key=/etc/mysql/server-key.pem

Ubuntu下面MySQL的参数文件my.cnf浅析

标签：slave   manual   print   oba   5.7   安装   replica   basic   report   

本文系统来源：http://blog.51cto.com/13963248/2308804

内容总结

以上是互联网集市为您收集整理的Ubuntu下面MySQL的参数文件my.cnf浅析全部内容，希望文章能够帮你解决Ubuntu下面MySQL的参数文件my.cnf浅析所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

---