Ubuntu下面MySQL的参数文件my.cnf浅析

java admin 2600 0 评论

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

转载请注明: 飞嗨_分享互联网 » Ubuntu下面MySQL的参数文件my.cnf浅析

赞 (0) or 分享 (0)
游客 发表我的评论   换个身份
取消评论

表情
(0)个小伙伴在吐槽

高效,专业,符合SEO

联系我们