【Docker】关于docker-compose顺序问题

docker-compose.yml文件

version: "3"
services:
mysql:
build: ./services/mysql
container_name: mysql
ports:
- ${MYSQL_PORT}:3306
volumes:
- ${MYSQL_DATA_PATH}:/var/lib/mysql:rw
- ./services/mysql/mysql.cnf:/etc/mysql/conf.d/mysql.cnf:ro
environment:
MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
MYSQL_USER: ${MYSQL_USER}
MYSQL_PASSWORD: ${MYSQL_PASSWORD}
MYSQL_DATABASE: ${MYSQL_DATABASE}
nodejs:
build: ./services/nodejs
container_name: nodejs
ports:
- ${NODE_PORT}:3000
links:
- mysql
depends_on:
- mysql
volumes:
- ./api:/var/www/html:rw

nodejs的dockerfile

FROM daocloud.io/library/node:11.6.0-alpine
WORKDIR /var/www/html
RUN npm config set unsafe-perm true
RUN npm config set registry https://registry.npm.taobao.org/
RUN npm install
RUN npm install -g pm2
CMD ./node_modules/.bin/sequelize db:migrate && npm start && pm2 list && pm2 logs

mysql的dockerfile文件

FROM mysql:8.0

现在问题是，mysql运行后接着nodejs也运行，去到./node_modules/.bin/sequelize db:migrate数据迁移这一步时会报错，因为mysql启动了，但是初始化数据库还没有完成，所以连接不成功。

想问问各位大牛，有什么比较好的解决办法呢？

回答

depends_on 只能决定启动顺序，不能决定就绪顺序（容器启动到程序就绪有个时间窗口）
如果只用 compose 这样简单的编排工具，需要自己去做就绪检查。
另外，不建议将 mysql 等数据持久化层和应用放在一起，最好 易变更组件 和 不易变更组件 分别部署。

这个顺序没有问题，只有 mysql 启动了数据迁移才可能执行成功啊。具体的报错信息是什么，方便贴一下吗？

报错信息

【Docker】关于docker-compose顺序问题

Successfully built b411e34b4606
Successfully tagged koaapi_nginx:latest
Recreating mysql ... 
Recreating mysql ... done
Recreating nodejs ... 
Recreating nodejs ... done
Recreating nginx ... 
Recreating nginx ... done
Attaching to mysql, nodejs, nginx
mysql     | Initializing database
nodejs    | 
nodejs    | Sequelize CLI [Node: 11.6.0, CLI: 5.4.0, ORM: 4.42.0]
nodejs    | 
nodejs    | Loaded configuration file "config/db.js".
nodejs    | Using environment "development".
nodejs    | Tue, 26 Feb 2019 02:42:01 GMT sequelize deprecated String based operators are now deprecated. Please use Symbol based operators for better security, read more at http://docs.sequelizejs.com/manual/tutorial/querying.html#operators at node_modules/[email protected]@sequelize/lib/sequelize.js:242:13
nodejs    | 
nodejs    | ERROR: connect ECONNREFUSED 172.23.0.2:3306
nodejs    | 
nodejs exited with code 1
mysql     | Database initialized
mysql     | MySQL init process in progress...
mysql     | MySQL init process in progress...
mysql     | Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it.
mysql     | Warning: Unable to load '/usr/share/zoneinfo/leap-seconds.list' as time zone. Skipping it.
mysql     | Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it.
mysql     | Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it.
mysql     | mysql: [Warning] Using a password on the command line interface can be insecure.
mysql     | mysql: [Warning] Using a password on the command line interface can be insecure.
mysql     | mysql: [Warning] Using a password on the command line interface can be insecure.
mysql     | mysql: [Warning] Using a password on the command line interface can be insecure.
mysql     | 
mysql     | 
mysql     | MySQL init process done. Ready for start up.
mysql     |

通过 depends_on 设置的依赖关系会决定容器启动的先后顺序，但是这里的判断标准是容器运行了就继续启动下一个(运行与执行完任务是有区别的)，如果你想更好的控制启动顺序，可以使用 wait-for-it 或者 dockerize 等官方推荐的第三方开源工具。
可参考官方文档https://docs.docker.com/compo...

以上是 【Docker】关于docker-compose顺序问题 的全部内容， 来源链接： utcz.com/a/77562.html

回到顶部