Docker script not connecting when run first time (sql dump) - docker

Question

I am trying to run mysql through docker and scripts. Everything works fine, it runs it creates users and database. I can connect to it using workbench, but it does not run dump.sql
I get following error
Access denied for user 'userxx'#'localhost' (using password: YES)
But if I run script once again, it will connect and it will run dump.sql
Here is my script:
#!/bin/sh
echo "Starting DB..."
docker run --name test_db -d \
-e MYSQL_ROOT_PASSWORD=test2018 \
-e MYSQL_DATABASE=test -e MYSQL_USER=test_user -e MYSQL_PASSWORD=test2018 \
-p 3306:3306 \
mysql:latest
# Wait for the database service to start up.
echo "Waiting for DB to start up..."
docker exec test_db mysqladmin --silent --wait=30 -utest_user -ptest2018 ping || exit 1
# Run the setup script.
echo "Setting up initial data..."
docker exec -i test_db mysql -utest_user -ptest2018 test < dump.sql
What am I doing wrong ? Or is there way to run dump through Dockerfile, Since I couldnt manage to do it?

Answer 1

If you run docker run --help, you will see these flags
--health-cmd string Command to run to check health
--health-interval duration Time between running the check (ms|s|m|h) (default 0s)
--health-retries int Consecutive failures needed to report unhealthy
--health-start-period duration Start period for the container to initialize before starting health-retries countdown (ms|s|m|h) (default 0s)
--health-timeout duration Maximum time to allow one check to run (ms|s|m|h) (default 0s)
So, you can use these command to check health with provided command. In your case, that command is
mysqladmin --silent -utest_user -ptest2018 ping
Now run as bellow
docker run --name test_db -d \
-e MYSQL_ROOT_PASSWORD=test2018 \
-e MYSQL_DATABASE=test -e MYSQL_USER=test_user -e MYSQL_PASSWORD=test2018 \
-p 3306:3306 \
--health-cmd="mysqladmin --silent -utest_user -ptest2018 ping" \
--health-interval="10s" \
--health-retries=6 \
mysql:latest
If you run docker ps, you will see
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5d1d160ed7de mysql:latest "docker-entrypoint.s…" 16 seconds ago Up 16 seconds (health: starting) 0.0.0.0:3306->3306/tcp test_db
You will see health: starting in Status.
Finally you can use this to wait. When your mysql is ready, health will be healthy.
So modify your script as below
#!/bin/bash
docker run --name test_db -d \
-e MYSQL_ROOT_PASSWORD=test2018 \
-e MYSQL_DATABASE=test -e MYSQL_USER=test_user -e MYSQL_PASSWORD=test2018 \
-p 3306:3306 \
--health-cmd="mysqladmin --silent -utest_user -ptest2018 ping" \
--health-interval="10s" \
--health-retries=6 \
mysql:latest
# Wait for the database service to start up.
echo "Waiting for DB to start up..."
until [ $(docker inspect test_db --format '{{.State.Health.Status}}') == "healthy" ]
do
sleep 10
done
# Run the setup script.
echo "Setting up initial data..."
docker exec -i test_db mysql -utest_user -ptest2018 test < dump.sql
Here, following command returns health status
docker inspect test_db --format '{{.State.Health.Status}}'
Wait until it returns healthy.
Note: I have used #!/bin/bash in script

Answer 2

Instead of executing a dump, better mount your sql file to the init directory of MySQL’s image: /docker-entrypoint-initdb.d in the run command.
Simply add the switch:
-v $PWD/dump.sql:/docker-entrypoint-initdb.d/dump.sql
Pro tip :) don’t use latest tag. Always use stable, specific tag like 5, 5.7, 8 etc.