Cannot connect to mysql from within a docker container

Question

Bulding a mysql based image as follows ( Dockerfile ):

FROM mysql:5.7

COPY somescripts* /docker-entrypoint-initdb.d/

and then exec-ing into it:

docker run --env="MYSQL_ROOT_PASSWORD=mypassword" -it theimagejustbuilt bash

but ...

root@73857bf5744e:/# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

Answer 1

Solution 1. Specify "127.0.0.1" as the host instead of localhost, ie mysql -h 127.0.0.1 -u root instead of mysql. Note that if you omit the host (mysql -u root) the MySQL client will implicitly use localhost.

Solution 2. In /etc/mysql/my.cnf you should see this near the top of the file:

[client]
port          = 3306
socket        = /var/run/mysqld/mysqld.sock
Change socket to the location of your MemSQL socket file. By default, this is /var/lib/memsql/data/memsql.sock.

Answer 2

Turns out I was accidentaly overriding the entrypoint via the following command:

docker run --env="MYSQL_ROOT_PASSWORD=mypassword" -it theimagejustbuilt bash

the bash keyword at the end is not needed since it overrides the default entrypoint and connection to mysql service is therefore not possible.