MYSQL Configuration.
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.[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
Here is entries for some specific programs
The following values assume you have at least 32M ram
This was formally known as [safe_mysqld]. Both versions are currently parsed.
re class=”western”
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
- Basic Settings
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
re class=”western”
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
Instead of skip-networking the default is now to listen only on
localhost which is more compatible and is not less secure.
bind-address = 192.168.1.220
- Fine Tuning
max_connections = 500
key_buffer = 384M
max_allowed_packet = 64M
thread_stack = 192K
thread_cache_size = 384
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
This replaces the startup script and checks MyISAM tables if needed
the first time they are touched
myisam-recover = BACKUP
max_connections = 18000
table_cache = 1800
thread_cache_size = 384
wait_timeout = 28800
connect_timeout = 20
tmp_table_size = 64M
thread_concurrency = 10
- Query Cache Configuration
query_cache_limit = 4M
query_cache_size = 128M
query_cache_type = 1
query_prealloc_size = 65536
re class=”western”
query_alloc_block_size = 131072
- 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
max_heap_table_size = 64M
max_allowed_packet = 64M
max_connect_errors = 1000
read_rnd_buffer_size = 524288
bulk_insert_buffer_size = 8M
query_cache_limit = 4M
query_cache_size =128M
query_cache_type = 1
query_prealloc_size = 65536
query_alloc_block_size = 131072
[mysqld_safe]
nice = -5
open_files_limit = 8192
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M
- 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/
Thanks…
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