MaxScale 未设置从属状态
我们希望通过 docker-compose 使用 MaxScale 和两个 MariaDB 数据库。
我们遇到的问题是我们无法通过 maxscale 实现数据库的复制。 两个数据库上均可通过 MaxScale 获得写入权限。通过 maxscale 容器中的命令 maxscale listservers
,我们可以看到这两个服务器。第一个服务器的状态为Master, Running
,第二个服务器的状态仅为Running
。
我的 docker-compose.yaml:
version: '3'
services:
# Application
app:
build:
context: .
dockerfile: app.dockerfile
working_dir: /var/www/project
volumes:
- ./project:/var/www/project
- ./php.ini:/usr/local/etc/php/php.ini
links:
- database:database
environment:
- "DATABASE_HOST=database"
- "DATABASE_PORT=4006"
# Web server
web:
image: nginx:latest
volumes:
- ./vhost.conf:/etc/nginx/conf.d/default.conf
- ./nginx-logs:/var/log/nginx
# Inherit from app container
- ./project:/var/www/project
- ./php.ini:/usr/local/etc/php/php.ini
ports:
- 0.0.0.0:8021:80
links:
- app:app
# Database
database:
image: mariadb:latest
ports:
- 0.0.0.0:3306:3306
volumes:
- ./database:/var/lib/mysql
- ./database-config:/etc/mysql/
command: mysqld --log-bin=mariadb-bin --binlog-format=ROW --server-id=3001 --log-slave-updates
environment:
- "MYSQL_ROOT_PASSWORD=secretDummyPassword"
- "MYSQL_DATABASE=database"
- "MYSQL_USER=database"
- "MYSQL_PASSWORD=secretDummyPassword"
- "skip-networking=0"
#Max Scale
maxscale:
image: mariadb/maxscale:6.2.3
depends_on:
- database
volumes:
- ./maxscale.cnf:/etc/maxscale.cnf
ports:
- 0.0.0.0:4006:4006 # readwrite port
- 0.0.0.0:4008:4008 # readonly port
- 0.0.0.0:8989:8989 # REST API port
links:
- database:database
volumes:
app: {}
我的 maxscale.cnf:
[maxscale]
threads=auto
[MariaDB-Monitor]
type=monitor
module=mariadbmon
servers=server1,server2
user=database
password=secretDummyPassword
auto_failover=true
auto_rejoin=true
enforce_read_only_slaves=1
[Read-Write-Service]
type=service
router=readwritesplit
servers=server1,server2
user=database
password=secretDummyPassword
master_failure_mode=fail_on_write
[Read-Write-Listener]
type=listener
service=Read-Write-Service
protocol=MariaDBClient
port=4006
[server1]
type=server
address=195.XXX.123.22
port=3306
protocol=MariaDBBackend
[server2]
type=server
address=142.XXX.186.188
port=3306
protocol=MariaDBBackend
We want to use MaxScale and two MariaDB databases with docker-compose.
We have the problem that we do not achieve replication of the database via maxscale.
Write permissions are available via MaxScale on both databases. Via the command maxscale list servers
in the maxscale container, we see both servers. The first server has the states Master, Running
and the second server has only the state Running
.
My docker-compose.yaml
:
version: '3'
services:
# Application
app:
build:
context: .
dockerfile: app.dockerfile
working_dir: /var/www/project
volumes:
- ./project:/var/www/project
- ./php.ini:/usr/local/etc/php/php.ini
links:
- database:database
environment:
- "DATABASE_HOST=database"
- "DATABASE_PORT=4006"
# Web server
web:
image: nginx:latest
volumes:
- ./vhost.conf:/etc/nginx/conf.d/default.conf
- ./nginx-logs:/var/log/nginx
# Inherit from app container
- ./project:/var/www/project
- ./php.ini:/usr/local/etc/php/php.ini
ports:
- 0.0.0.0:8021:80
links:
- app:app
# Database
database:
image: mariadb:latest
ports:
- 0.0.0.0:3306:3306
volumes:
- ./database:/var/lib/mysql
- ./database-config:/etc/mysql/
command: mysqld --log-bin=mariadb-bin --binlog-format=ROW --server-id=3001 --log-slave-updates
environment:
- "MYSQL_ROOT_PASSWORD=secretDummyPassword"
- "MYSQL_DATABASE=database"
- "MYSQL_USER=database"
- "MYSQL_PASSWORD=secretDummyPassword"
- "skip-networking=0"
#Max Scale
maxscale:
image: mariadb/maxscale:6.2.3
depends_on:
- database
volumes:
- ./maxscale.cnf:/etc/maxscale.cnf
ports:
- 0.0.0.0:4006:4006 # readwrite port
- 0.0.0.0:4008:4008 # readonly port
- 0.0.0.0:8989:8989 # REST API port
links:
- database:database
volumes:
app: {}
My maxscale.cnf
:
[maxscale]
threads=auto
[MariaDB-Monitor]
type=monitor
module=mariadbmon
servers=server1,server2
user=database
password=secretDummyPassword
auto_failover=true
auto_rejoin=true
enforce_read_only_slaves=1
[Read-Write-Service]
type=service
router=readwritesplit
servers=server1,server2
user=database
password=secretDummyPassword
master_failure_mode=fail_on_write
[Read-Write-Listener]
type=listener
service=Read-Write-Service
protocol=MariaDBClient
port=4006
[server1]
type=server
address=195.XXX.123.22
port=3306
protocol=MariaDBBackend
[server2]
type=server
address=142.XXX.186.188
port=3306
protocol=MariaDBBackend
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如果您尚未手动配置复制,则可以在 Maxscale 容器内使用以下命令来设置服务器之间的复制:
这会导致为
MariaDB-Monitor
配置的所有其他服务器开始从以下位置进行复制服务器1
。注意:此命令会重置 GTID 位置,因此不应在实时系统上使用。如果您使用的是实时系统,请使用
CHANGE MASTER TO
命令具有正确的 GTID 坐标。它不会触及数据,但您会丢失历史记录(它会执行重置主控
)。如果您希望在容器首次启动时自动配置复制,您可以在
/docker-entrypoint-initdb.d
挂载一个包含 SQL 命令的文件,MariaDB 将在启动时执行它们。对于自动化系统来说,这可能是一个更好的解决方案,并且对于测试设置来说非常方便。If you haven't configured the replication manually, you can use the following command inside the Maxscale container to set up replication between the servers:
This causes all other servers configured for the
MariaDB-Monitor
to start replicating fromserver1
.Note: this command resets the GTID positions so it should not be used on a live system. If you are using a live system, use the
CHANGE MASTER TO
command with the correct GTID coordinates. It won't touch the data but you'll lose the history (it does aRESET MASTER
).If you want the replication to be configured automatically when the container is first started, you can mount a file with SQL commands in it at
/docker-entrypoint-initdb.d
and MariaDB will execute them during startup. This is probably a better solution for automated systems and it is quite convenient for a test setup.