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我需要在我的 PC 上运行多个 MySQL 实例。我这样做了:
yum install mariadb-server mariadb
=>安装mysql
mysql_install_db --datadir=/var/lib/mysql
=> 使用 mysql_install_db 为第一个实例创建 datadir
mysql_install_db --datadir=/var/lib/mysql2
=> 使用 mysql_install_db 为第二个实例创建 datadir
chown -R mysql:mysql /var/lib/mysql
chown 所有者用户:所有者组
chown -R mysql:mysql /var/lib/mysql2
chown 所有者用户:所有者组
然后我修改了多个实例的 my.cnf 文件:
[client]
#password = your_password
port = 3306
socket = /var/lib/mysql/mysql.sock
# Here follows entries for some specific programs
# The MariaDB server
[mysqld_multi]
mysqld = /usr/bin/mysqld_safe
mysqladmin = /usr/bin/mysqladmin
[mysqld0]
port = 3306
socket = /var/lib/mysql/mysql.sock
pid-file = /var/run/mysqld/mysqld.pid
datadir = /var/lib/mysql
server-id = 1
log-bin = mysql-bin
binlog_format = mixed
[mysqld2]
port = 3307
socket = /var/lib/mysql2/mysql.sock
pid-file = /var/run/mysqld/mysqld2.pid
datadir = /var/lib/mysql2
server_id = 2
skip-log-bin
然后我使用这个命令mysqld_multi report
并得到了这个:
Reporting MySQL servers
MySQL server from group: mysqld0 is not running
MySQL server from group: mysqld2 is not running
然后我使用mysqld_multi start
andmysqld_multi report
再次收到相同的消息:
Reporting MySQL servers
MySQL server from group: mysqld0 is not running
MySQL server from group: mysqld2 is not running
我在网上冲浪并找到了这个解决方案多个实例和mysqld_multi。但我没有找到解决问题的关键。我要做什么来运行我的实例?
答案1
我发现为什么我无法启动我的两个实例。有必要对/etc/my.cnf
文件中的 [client] 部分进行注释并以正确的方式unit
编写。/etc/systemd/system
这是我的做法:
/etc/my.cnf 文件的配置:
[mysqld_multi]
mysqld = /usr/bin/mysqld_safe
mysqladmin = /usr/bin/mysqladmin
[mysqld1]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port=3306
datadir=/var/lib/mysql
server_id=1
log-bin=mysql-bin
binlog_format=mixed
[mysqld2]
user = mysql
pid-file = /var/run/mysqld/mysqld2.pid
socket = /var/run/mysqld/mysqld2.sock
port=3307
datadir=/var/lib/mysql2
server_id=2
skip-log-bin
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
/etc/systemd/system/mysqld_multi_service.service的配置:
[Unit]
Description= mysqld_multi_service
[Service]
Type=simple
ExecStart=/usr/bin/mysqld_multi start
ExecStop=/usr/bin/mysqld_multi stop
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target
然后systemctl enable mysqld_multi_service.service
和systemctl start mysqld_multi_service.service
。后全部执行此步骤后,您可以使用以下命令连接到第一个实例:
mysql -u root -S /var/run/mysqld/mysqld.sock
或到第二个实例:
mysql -u root -S /var/run/mysqld/mysqld2.sock
答案2
来自MySQL 文档,看起来 mysql_multi 不应该再使用了:
由于 systemd 能够在安装了 systemd 支持的平台上管理多个 MySQL 实例,因此 mysqld_multi 和 mysqld_multi.server 是不必要的,因此不会安装。对于 RPM 平台的 MySQL 5.7.13 和 Debian 平台的 MySQL 5.7.19 来说都是如此。
相反,您应该使用 systemd 来管理您在配置文件中设置的实例my.cnf
。请参阅Configuring Multiple MySQL Instances Using systemd
提供的链接中的部分。