How the external app can access DB container

Docker Hub
1

Hi,
I have 2 containers

  • frontend-app locates in frontend network
  • DB locates in the internal network

the frontend-app container can access DB container but i couldn’t access DB container from an external app that locates on an external machine. what should i do to make the external app can access DB container?

these the commands that i use to create these containers

Frontend-app Container:
docker container run -d --name frontend-app --network frontend   nginx:latest

DB container:
docker run -d --name database -p 3306:3306 -v /storage/data/mysql:/var/lib/mysql  --network localhost -e MYSQL_ROOT_PASSWORD=PW mysql:latest --default_authentication_plugin=mysql_native_password
2

Have you tried connecting to other services running on the same host? How are you connecting to the DB from the external app? Are you using the correct hostname/IP of the host?

3

Hi @maximization,
Have you tried connecting to other services running on the same host?

ys i can connect DB container from other app containers that in the same host. but i couldn’t connect from external machine.

How are you connecting to the DB from the external app?

i have open 3306 port in Iptables then tried to telnet on port 3306 from the external machine but not reachable
telnet Host_Public_IP 3306

I think this due to DB in private network (localhost network), there is anyway to make DB reachable from external machine without put it in bridge network.

4

What if you try doing -p 0.0.0.0:3306:3306 ? It’s usually the default but maybe your configuration has changed