连接到Microsoft Azure VM中Docker容器内的MySQL Server

Question

I created an Ubuntu 15.10 VM on Microsoft Azure. On the Server i created a docker container with MySQL running (IP: 172.17.0.2)

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
4255233555db        mysql               "/entrypoint.sh mysql"   16 hours ago        Up 16 hours         0.0.0.0:3306->3306/tcp   compose_mysql_1

I can connect over ssh to the VM and then access the MySQL-Server running in the docker container.

I now wanna have access to the MySQL-Server from the outside so that my WebApp on Microsoft Azure (same Ressource Group) can connect to the database.

I already forwarded the port 3306 of the VM to 172.17.0.2:3306.

With MySQL-Workbench from my local PC i can't connect to the MySQL-Server. In fact i am not sure which credentials i need to provide to connect. I tried it with the public ip of the VM and the root password of the MySQL-Server. But shouldn't i somewhere also provide the password and user for the VM itself?

Answer 1

Other than the firewall on the actual VM, Azure manage ports security using a separate VPC Network security group. By default, the Network group associated with your VM does not allow inbound TCP connections on port 3306. You have to add that manually:

1. Go to Network interfaces

2. Select your network interface

3. Select Network security group

4. Select your group (usually only one here)

5. Select Inbound security rules

6. Click Add and Fill as follow

7. Finally apply the changes and wait for 1-2 minutes (time for the new settings to propagate correctly, although it should be instantly)

Magic!

Answer 2

Alternative to directly using official MySQL images

I also had troubles getting the official MySQL image running and accessible. sameersbn/docker-mysql provides an nice and easy wrapper that lets you specify user and database to be set up.

My docker-compose file has the following section:

db:
  image: sameersbn/mysql:latest
  volumes:
    - /opt/mysql/data:/var/lib/mysql
  environment:
    - DB_USER=${DB_USER}
    - DB_PASS=${DB_PASS}
    - DB_NAME=theDatabaseName
  ports:
    - "3306:3306"

The details:

• image - The above mentioned wrapper.
• volumes - Mapping the data on the persistent host.
• environment - Variables that define the database setup. Either give plain text as with DB_NAME or access environment variables through the ${...} syntax.
• ports - Map out the port 3306 on the host so it may be accessed remotely.