// Docker is unable to map the mysql folder containing the socket file. // Change the following line in the volumes property of your db container in the docker-compose.yml from - 'sail-mysql:/var/lib/mysql' // to '- '${MYSQL_DOCKER_FOLDER}:/var/lib/mysql' // The corresponding env variable might hold something like MYSQL_DOCKER_FOLDER=./mysql // Create the "mysql" folder at the root of the file