英文:
Mysql connection refused in docker-compose
问题
我在docker-compose中的golang应用程序中连接MySQL时遇到了问题。我可以从控制台连接到数据库：mysql -u user -D data -h 0.0.0.0 -P3306 -p
但是，使用docker-compose时无法连接。
我的docker-compose.yml文件如下：
version: '3'
services:
app:
build: ./
volumes:
- ./internal/app:/app
- ./logs:/var/log/parser
links:
- db
db:
image: mysql:8
container_name: mysqldb
ports:
- "3306:3306"
volumes:
- ./docker/mysql/conf:/etc/mysql/conf/conf.d
- ./docker/mysql/logs/:/var/log/mysql
- ./docker/mysql/init:/docker-entrypoint-initdb.d
- ./docker/mysql/data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: pass
MYSQL_DATABASE: data
MYSQL_USER: user
MYSQL_PASSWORD: pass
在我的app main.go文件中：
dbConfig := mysql.NewConfig()
dbConfig.User = "user"
dbConfig.Passwd = "pass"
dbConfig.Addr = "mysqldb"
dbConfig.DBName = "data"
dbConfig.Net = "tcp"
db, err := sql.Open("mysql", dbConfig.FormatDSN())
if err != nil {
panic(err.Error())
}
defer db.Close()
但是我得到了以下错误：
panic: dial tcp 172.20.0.2:3306: connect: connection refused
英文:
I have a problem connecting to MySQL from my golang app in docker-compose. I can connect to db from console: mysql -u user -D data -h 0.0.0.0 -P3306 -p
But, I can't connect when using docker-compose.
My docker-compose.yml
version: '3'
services:
app:
build: ./
volumes:
- ./internal/app:/app
- ./logs:/var/log/parser
links:
- db
db:
image: mysql:8
container_name: mysqldb
ports:
- "3306:3306"
volumes:
- ./docker/mysql/conf:/etc/mysql/conf/conf.d
- ./docker/mysql/logs/:/var/log/mysql
- ./docker/mysql/init:/docker-entrypoint-initdb.d
- ./docker/mysql/data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: pass
MYSQL_DATABASE: data
MYSQL_USER: user
MYSQL_PASSWORD: pass
In my app main.go
dbConfig := mysql.NewConfig()
dbConfig.User = "user"
dbConfig.Passwd = "pass"
dbConfig.Addr = "mysqldb"
dbConfig.DBName = "data"
dbConfig.Net = "tcp"
db, err := sql.Open("mysql", dbConfig.FormatDSN())
if err != nil {
panic(err.Error())
}
defer db.Close()
But I get this error:
panic: dial tcp 172.20.0.2:3306: connect: connection refused
答案1
得分: 2
我认为你的golang服务在MySQL服务之前启动。所以你必须先启动MySQL服务，然后再启动golang服务，可以使用depends_on来实现这一点。
新的docker-compose.yml文件中包含depends_on：
version: '3'
services:
app:
build: ./
volumes:
- ./internal/app:/app
- ./logs:/var/log/parser
depends_on:
- mysqldb
links:
- db
db:
image: mysql:8
container_name: mysqldb
ports:
- "3306:3306"
volumes:
- ./docker/mysql/conf:/etc/mysql/conf/conf.d
- ./docker/mysql/logs/:/var/log/mysql
- ./docker/mysql/init:/docker-entrypoint-initdb.d
- ./docker/mysql/data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: pass
MYSQL_DATABASE: data
MYSQL_USER: user
MYSQL_PASSWORD: pass
英文:
I think your golang service starts before the MySQL service. so you have to start MySQL service first then golang service so, use depends_on to achieve that.
new docker-compose.yml with depends_on
version: '3'
services:
app:
build: ./
volumes:
- ./internal/app:/app
- ./logs:/var/log/parser
depends_on:
- mysqldb
links:
- db
db:
image: mysql:8
container_name: mysqldb
ports:
- "3306:3306"
volumes:
- ./docker/mysql/conf:/etc/mysql/conf/conf.d
- ./docker/mysql/logs/:/var/log/mysql
- ./docker/mysql/init:/docker-entrypoint-initdb.d
- ./docker/mysql/data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: pass
MYSQL_DATABASE: data
MYSQL_USER: user
MYSQL_PASSWORD: pass
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