如何覆盖标准 mysql 5.7 容器配置

Question

我无法替换标准 mysql 5.7 容器中的标准 /etc/my.cnf 文件。

我是运行一个 mysql 5.7 容器（标准 Docker HUB 映像）。我想替换 etc/my.cnf 文件以启用主从操作。我想通过挂载 docker-compose.yml 文件中的卷来实现。

新的my.cnf应该是：

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/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-host-cache
skip-name-resolve
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
secure-file-priv=/var/lib/mysql-files
user=mysql

# Replication and mirroring settings
server-id = 1
auto_increment_increment = 3
auto_increment_offset = 0
log_bin           = /var/log/mysql/log-bin
log_bin_index     = /var/log/mysql/log-bin.index
binlog_format     = row
expire_logs_days  = 10
log_slave_updates

# 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 docker-compose.yml 我有以下几行：

mysql:
    image: mysql/mysql-server:5.7
    container_name: rucio-mysql
    volumes:
      - ./mysql-config/my-master.cnf:/etc/my.cnf
    environment:
      - MYSQL_ROOT_PASSWORD=pass
      - MYSQL_ROOT_HOST=%

路径正确，但容器启动并立即退出。

提前致谢，

滑动

Answer 1

您不能将文件指定为卷，这是行不通的。卷是目录。

如果您的配置是不变的并且不希望在容器执行之间发生变化，只需从 mysql/mysql-server:5.7 继承您自己的容器并将新配置 COPY 放入其中：

Dockerfile

FROM mysql/mysql-server:5.7
COPY my.cnf /etc/

并在 docker-compose 中使用您的新图片。

如果配置需要更改，最好使用卷，但您必须在容器启动时手动覆盖它。像这样：

docker-compose.yml

mysql:
    image: mysql/mysql-server:5.7
    container_name: rucio-mysql
    volumes:
      - ./mysql-config:/configs
    environment:
      - MYSQL_ROOT_PASSWORD=pass
      - MYSQL_ROOT_HOST=%
    command: ["cp", "-f", "/configs/my-master.cnf", "/etc/my.cnf"]

Answer 2

参考 docker 中心部分 "Configuration without a cnf file" 上的官方 MySQL Docker repo，它清楚地提到您可以在基本映像名称后提供配置标志，我发现这更容易运行而不是构建 docker 图像。我的示例 docker 运行命令将内存使用从默认的 480 mb 优化到仅仅 100 mb

docker 运行 -d -p 3306:3306 -e MYSQL_DATABASE=test -e MYSQL_ROOT_PASSWORD=tooor -e MYSQL_USER= test -e MYSQL_PASSWORD=test -v /mysql:/var/lib/mysql --name mysqldb mysql --table_definition_cache=100 --performance_schema =0 --default-authentication-plugin=mysql_native_password

如何覆盖标准 mysql 5.7 容器配置

How to override standard mysql 5.7 container configuration

mysql

my.cnf

docker