Connecting to a mysql running on a Docker container

[dzlab]

I'm trying to run mysql server on a Docker (installed with Docker Toolbox for Mac) container and access it from my machine running OS X Yosemite. The documentation from the official repo does not explain how to connect from outside the docker host !!

I've created a container using the official repository as follows:

$ docker pull mysql
$ docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest -p 3306:3306 
$ docker-machine ip default
192.168.99.100
$ docker inspect CONTAINER_ID

Then I get the ip address (172.17.0.1), but when I ping it I see time outs!!!
I tried to add port forward to the default machine:

VBoxManage controlvm "default" natpf1 "tcp-port3306,tcp,,3306,,3306";

But when connecting with Sequel pro (a mysql client) with root@192.168.99.100 on 3306, I have a connection failure.

What's the appropriate way to connect to the running mysql server?

[dzlab]

It looks mysql interpreting the -p as an argument, I just had to move the argument:

docker run -p 3306:3306 --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest

[flacoman91]

By any chance did you get this to work? I have a docker container that runs mysql, but i cannot figure out what the settings are in sequel pro to get it to connect.

What credentials are needed?

[helderco]

@flacoman91 how are you running your container (i.e., arguments to docker run, or docker compose service)?

[flacoman91]

@helderco
It's in docker-compose.yml
mysql:
build: docker-build-contexts/mysql
environment:

• MYSQL_ROOT_PASSWORD=mypassword

Running docker ps i get
fc46f6b9e08e service_mysql "/entrypoint.sh mysql" 18 hours ago Up 18 hours 3306/tcp service_mysql_1

[helderco]

You need to publish your mysql port to your host. The port can be a specific one or random. If random use docker-compose port mysql 3306 to get it at runtime (you can also see it in docker-compose ps).

Since you're using Sequel Pro, I guess you're using a Mac, with a VM for docker server. If you're using docker-machine, you can get the IP address with docker-machine ip <name>.

Credentials (Standard connection in Sequel Pro):

Host: IP of your docker machine host
Username: root
Password: mypassword
Database: mydatabase
Port: your specific port or randomly attributed one

Example for random host port (avoids conflict with other projects):

mysql:
  build: docker-build-contexts/mysql
  ports:
    - 3306
  environment:
    - MYSQL_DATABASE=mydatabase
    - MYSQL_ROOT_PASSWORD=mypassword

I actually use a script to open directly in Sequel Pro from the command line. You can get it at https://gist.github.com/helderco/e9d8d072a362ad818f6a

This is how I use it:

db-open mydatabase

It launches a new window already opened in that database in my container. Note that I assume password is root (my convention in development). It also assumes you use docker-machine. The database is optional, and you can set the other credentials manually with arguments.

[flacoman91]

THANK YOU THANK YOU!

That worked. i missed the step where you said:

If you're using docker-machine, you can get the IP address with docker-machine ip .

I kept putting in the ip for the individual container, and not the docker host, which in my case is just the default or 192.168.99.100 and the port was the randomly assigned one which was found through
docker ps

[fariazz]

Struggled with this for ages until I realised I was entering http://my-docker-ip-address instead of just my-docker-ip-address. Remove that http!

[dslopez]

Hi, I have this container:

$ docker ps
CONTAINER ID IMAGE COMMAND CREATED
STATUS PORTS NAMES
8441f5d60a49 mysql:5.7 "docker-entrypoint.sh" 2 hours ago
Up 2 hours 3306/tcp shopapp-mysql

And i run
$ docker-machine ip shopapp-mysql

Getting
Host does not exist: "shopapp-mysql"

I've tried with Container ID and have the same response. ¿How can I get the specific IP of the shopapp-mysql container?

[helderco]

You're trying to use docker machine in a container, which are different tools.

Try:

$ docker inspect shopapp-mysql

[dslopez]

I've tried that too, it give me a IPAddress=172...... I try to connect to that IP from an mysql client but I get conection timeout....

[helderco]

I assume you use docker machine with Mac or Windows.

Just find the forwarded port with:

$ docker port shopapp-mysql 3306
0.0.0.0:32768

And your docker machine IP with:

$ docker-machine ip
192.168.99.100

Now point your mysql client to (example): 192.168.99.100:32768

Note: The 3306 port needs to be exposed, which from your docker ps I can see it is not.

[dslopez]

thanks @helderco !! I have run my container exposing the port to my PC

$ docker run -p 3306:3306 --name shopapp-mysql -e MYSQL_ROOT_PASSWORD=myRootpwd32 -d mysql:5.7

And that works!

[TristanCP]

In this Dockerfile, a "mysql" user is created but there is no "USER mysql" instruction. So why, when you run the image without "-u" or "--user" mysqld is running as "mysql" and not as "root" ?

[yosifkit]

@TristanCP, the entrypoint script drops to the mysql user as soon as it has done the things that required root access:

mysql/8.0/docker-entrypoint.sh

Lines 62 to 67 in 64e0cf2

	if [ "$1" = 'mysqld' -a -z "$wantHelp" -a "$(id -u)" = '0' ]; then
	_check_config "$@"
	DATADIR="$(_datadir "$@")"
	mkdir -p "$DATADIR"
	chown -R mysql:mysql "$DATADIR"
	exec gosu mysql "$BASH_SOURCE" "$@"

.