Why connection between phpmyadmin and mysql docker container doesn't work - mysql

Question

I'm trying to connect a phpmyadmin-container to a mysql-container to view the databases. phpmyadmin web interface return error Cannot log in to the MySQL server with mysqli_real_connect(): (HY000/2002): No route to host.
What am I doing wrong? Thanks.
I use this operations:
docker-compose down && docker-compose up -d
Type to web browser http://localhost:8080
I use login as user root, password test
Get error described above
My docker-compose.yml
version: '2'
services:
db:
image: mysql
environment:
MYSQL_ROOT_PASSWORD: test
ports:
- "3306:3306"
phpmyadmin:
image: phpmyadmin/phpmyadmin
links:
- db
ports:
- "8080:80"

Answer 1

See official guide:
You need to specify some environment in order to link to an external mysql container:
Environment variables summary
PMA_ARBITRARY - when set to 1 connection to the arbitrary server will be allowed
PMA_HOST - define address/host name of the MySQL server
PMA_VERBOSE - define verbose name of the MySQL server
PMA_PORT - define port of the MySQL server
PMA_HOSTS - define comma separated list of address/host names of the MySQL servers
PMA_VERBOSES - define comma separated list of verbose names of the MySQL servers
PMA_PORTS - define comma separated list of ports of the MySQL servers
PMA_USER and PMA_PASSWORD - define username to use for config authentication method
PMA_ABSOLUTE_URI - define user-facing URI
For you, the mysql name is db, so you need to do next:
version: '2'
services:
db:
image: mysql
environment:
MYSQL_ROOT_PASSWORD: test
ports:
- "3306:3306"
command: --default-authentication-plugin=mysql_native_password
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- "8080:80"
environment:
PMA_HOSTS: db
Also, --link depracated, just delete it, docker-compose will set network for you automatically to let the containers see each other with dns help.