I'm required to build a multi-database MySQL container, this was straight forward as I followed this tutorial: https://dzone.com/articles/multiple-mysql-databases-with-one-mysql-container
Now I have to run my wordpress container and connect it to one of these databases, I tried what I already know:
docker run -e WORDPRESS_DB_PASSWORD=pass --network wordpress --name wordpress --link mysqldb:mysql -p 4123:80 -v "$PWD/html":/var/www/html -d wordpress
where mysqldb is the container's name but with no luck whatsoever.
What is the proper syntax to link wordpress container with one of these databases? They are two, the other one should be used for another purpose.
I don't have the liberty to use two MySQL containers, any advice is highly appreciated, thanks.
the name when you linked mysqldb:mysql is the database server hostname. In your sample, it is mysql
You can cat /etc/hosts to confirm the mysql hostname in your application container wordpress
Second, you don't have to build a seperate multi-database containers, you just link several times.
# create first mysql database container.
$ docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql
4914c6fbb3e870b530fc5713908cd918ad3d1c43ebbeb460b878857328934f95
# create second mysql database container.
$ docker run --name some-mysql2 -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql
72090be34a5d62ea53edd87e4b513ad5c0c413fe8b223fe36c2aae6938fd77c4
# run your application with links
$ docker run -d --name wordpress --link some-mysql:mysql1 --link some-mysql2:mysql2 wordpress
f1d6fbc2fcf30862efd0a4a4882425e359a2442c1476c0256c338e80a46ae66d
You can check the hostname in wordpress container
$ docker exec -ti f1 bash
root#f1d6fbc2fcf3:/var/www/html# cat /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.2 mysql1 4914c6fbb3e8 some-mysql # <= here is the first mysql hostname
172.17.0.3 mysql2 72090be34a5d some-mysql2 # <= here is the second mysql hostname
172.17.0.4 f1d6fbc2fcf3
root#f1d6fbc2fcf3:/var/www/html#
Related
The instructions here: https://hub.docker.com/_/mysql indicate to run
$ docker run -it --network some-network --rm mysql mysql -hsome-mysql-container -uexample-user -p
But i have no idea what some-network is? So i run this instead and get and 'unknown MySQL host' error even though some-mysql-container is definitely the name of my container.
$ docker run -it--rm mysql mysql -hsome-mysql-container -uexample-user -p
What am I doing wrong here?
'some-network' refers to a docker-network. You need to create it first. I named it 'mysql-network' to make its purpose a bit more clear:
docker network create mysql-network
Then, start database container:
docker run --network mysql-network --name mysql-db -e MYSQL_ROOT_PASSWORD=mysecretpassword -d mysql
Then, start a the client container to connect to the first one:
docker run -it --network mysql-network --rm mysql mysql -hmysql-db -uroot -p
By adding both containers to the same network, they are able to communicate with each other.
I want to run and open a mysql Cli in docker just with one command . Something like this is not working:
docker run --rm -it -p 33060:3306 --name mydb -e MYSQL_ROOT_PASSWORD=secret mysql mysql -p
I know I can connect to mysql after running my container this way
docker -it docker exec -it mydb mysql -p
but i want to do it in one liner.
Thanks
(Updated)*****
Seems that you can do it in version 8 calling MySQLsh at the end of the command. But unable to do it for previous versions
docker run --name=mk-mysql -p3306:3306 -e MYSQL_ROOT_PASSWORD=my-secret-pw -it mysql/mysql-server:8.0.20 mysqlsh
The database server and client are two separate programs. A container only runs one program, so you can't run both the server and the client in the same container, both as the main process. You could write a script that starts the container and then runs mysql to connect to it, but that's about the best you can do.
#!/bin/sh
docker run -d -p 33060:3306 --name mydb -e MYSQL_ROOT_PASSWORD=secret mysql
exec mysql --host=127.0.0.1 --port=33060 --connect-timeout=60 --wait --password
If you're trying to do this to create a database or do other first-time initialization, you can bind-mount an initialization script into /docker-entrypoint-initdb.d and it will run as part of the database setup (only the very first time the database is started).
# Create the storage for the database
# (delete and recreate to rerun the init script)
docker volume create mysql-data
docker run \
-v mysql-data:/var/lib/mysql \
-v $PWD/init.sql:/docker-entrypoint-initdb.d/init.sql \
... \
mysql
If you're just trying to experiment with SQL commands, a serverless database like SQLite might fit your needs better.
the -p parameter is for the ports to be published and should not be part of the -it interactive, that should be your error,
Have a read of the docker run command, in the docker documentation,
https://docs.docker.com/engine/reference/run/
I'm trying to link two containers together, I was able to connect a PhpMyAdmin container with a MySQL container, but nothing seem to work when I'm using a WordPress container.
I tried different things, actually I'm using this command to run a MySQL container:
sudo docker run --name sql -e MYSQL_ROOT_PASSWORD=pass mysql
and this one to set up the WordPress container:
sudo docker run --name wpress -e WORDPRESS_DB_USER=root -e WORDPRESS_DB_PASSWORD=pass -e WORDPRESS_DB_HOST=172.17.0.2 -p 8085:80 --link sql:mysql wordpress
MySQL container work fine, but I have this output from wpress:
MySQL Connection Error: (2054) The server requested authentication method unknown to the client
Warning: mysqli::__construct(): The server requested authentication method unknown to the client [caching_sha2_password] in Standard input code on line 22
What I am doing wrong?
Edit:
I was able to connect the wpress container to sql container a couple of time during some test by adding a port to WORDPRESS_DB_HOST, which will give:
sudo docker run --name wpress -e WORDPRESS_DB_USER=root -e WORDPRESS_DB_PASSWORD=pass -e WORDPRESS_DB_HOST=172.17.0.2:3306 -p 8085:80 wordpress
(I also remove the --link option, it worked without it).
So it work 2-3 times, but it doesn't work anymore.
It seem to be a version error. Use an image with a different version of mysql, mysql:5.7 for example, and it should work.
I had same problem/error.
This is what I had to do for mysql and wordpress:
docker run --name wordpressdb -e MYSQL_ROOT_PASSWORD=password -d mysql
docker exec -it wordpressdb bash
#inside run:
mysql -uroot -ppassword
#paste
ALTER USER 'root'#'%' IDENTIFIED WITH mysql_native_password BY 'password';
exit
exit
docker run --name wordpress -e WORDPRESS_DB_USER=root -e WORDPRESS_DB_PASSWORD=password -p 8080:80 --link wordpressdb:mysql -d wordpress
Im running docker on windows and I start up a docker container with MySql like this
docker run -p 3306:3306 --name test -e MYSQL_ROOT_PASSWORD=secret-pw -d mysql/mysql-server:5.5
Then on my host I start up Mysql workbench and try to connect but it does not work.
docker inspect test reveal IP address on 172.17.0.2 but when I ping this I get no reply
Got this working on a linux host and I am pretty sure I have done the exact same steps
What am I doing wrong ?
Help Doc: https://docs.docker.com/samples/library/mysql/
Image link: https://store.docker.com/images/mysql
Command: docker run --name mysql_container_name --expose=3306 -p 3306 -v /my/own/datadir:/path/to/data/dir -e MYSQL_ROOT_PASSWORD=root_pwd -d mysql:tag --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
mysql_container_name: docker container name
expose: contaner exposeing port
p: host buinding port
/path/to/data/dir: share path between container and host
root_pwd: mysql root password
tag: repository tag
utf8mb4: mysql server character set and collation type
utf8mb4_unicode_ci: mysql server character set and collation type
Example: docker run --expose=3306 -p 3306 --name mysql -v /my/own/datadir:/opt/mysql -e MYSQL_ROOT_PASSWORD=0112358139 -d mysql:latest --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
Following steps to connect remotely:
docker exec -it mydb bash --> this will connect to mySql container.
echo "bind-address = 0.0.0.0" >> /etc/mysql/my.cnf --> this will update the my.cnf file.
service mysql restart --> restart the mySql service.
exit --> the mySql container.
docker inspect mysql | grep IPAddress --> grep the IP address of the contaner.
mysql -h 172.17.0.2 -u root –p --> remotely connect to the mySql.
Your host 3306 port should be forwarding to the container, so try connecting on localhost:3306. When I tried to replicate, got the "Host 172.17.0.1 not allowed to connect to this MySQL server" which means it got through at least.
More on the latter: https://github.com/fideloper/docker-mysql/issues/10
I have a mysql container which runs fine. I can start it and see it up and running in the docker ps list.
I then try to run another learnitouch container in which an engine-db-seed.sh shell script tries to connect to the mysql container server.
The learnitouch container Dockerfile contains:
ENTRYPOINT ["/bin/bash", "/usr/bin/learnintouch/engine-db-seed.sh"]
The engine-db-seed.sh file contains:
/usr/bin/mysql/install/bin/mysql --protocol=tcp -h 172.17.0.2 -u root -proot -v < /usr/bin/learnintouch/db_engine-db.sql
The db_engine-db.sql is being seeded all right in the mysql database.
But I had to hard code the mysql container IP as you can see in the -h option. I got the 172.17.0.2 IP address from a docker inspect on the mysql container. Not the most automated way...
How can I do without such hard coding ?
Running the mysql container:
docker run -d -p 3306:3306 -v /home/stephane/dev/php/learnintouch/docker/mysql/data:/usr/bin/mysql/install/data --name mysql stephane/mysql:5.6.30
Running the learnintouch container:
docker run -p 127.0.0.1:80:80 --link mysql:mysql --name learnintouch stephane/learnintouch
I'm using Docker version 1.12.1, build 23cf638
Just use the service name and make sure that both services are running on the same network (bridge0 by default).
So if you create your mysql service like this
docker run -d --name foo mysql-image
your engine-db-seed.sh could then be
/usr/bin/mysql/install/bin/mysql --protocol=tcp -h foo -u root -proot -v < /usr/bin/learnintouch/db_engine-db.sql
mysql will make a dns request for foo which will be resolved by Docker to the ip of your foo service.