Removing intermediate container defb868f4207 Removing intermediate container 34f1d9807bad Step 14/15 : RUN cp /etc/mysql/data.sql /docker-entrypoint-initdb.d Step 3/15 : RUN chown -R mysql:root /var/lib/mysql/ Removing intermediate container a647bd02b91f Sending build context to Docker daemon 7.168kB Subsequently, it also creates the databases and loads the data specified in the data.sql file: # docker-compose up When we skim through the output lines, we can see that they form the new layers in each step on top of the MySQL image. To bring up the MySQL container, we need to execute docker-compose up. Now, we’re all set to spin up a container through docker-compose. Create a database using `MYSQL_DATABASE` placeholderĬREATE DATABASE IF NOT EXISTS `MYSQL_DATABASE` Ĭurrently, the directory structure looks like this: Finally, it also uses the created database with the USE command:. It makes the circle complete by managing both databases and tables. We’ll add the below snippet in the data.sql file, which creates the databases if they do not exist. However, the database creation or removal isn’t managed in the created dump file. *!40000 ALTER TABLE `Customers` ENABLE KEYS */ INSERT INTO `Customers` VALUES ('Cardinal','Tom B. `CustomerName` varchar(255) DEFAULT NULL, *!50503 SET character_set_client = utf8mb4 */ # mysqldump -u root -p my_db_name > data.sqlĪt a high level, the backup file will drop any table named Customers in the chosen database and insert all backed-up data into it: # cat data.sql Using a simple command with inline arguments, we can quickly take the backup of the MySQL tables: | Wilman Kala | Matti Karttunen | Keskuskatu 45 | Helsinki | 21240 | Finland |Īs part of the MySQL RDBMS package, the mysqldump utility is used to backup all data in a database into a text file. Erichsen | Skagen 21 | Stavanger | 4006 | Norway | | CustomerName | ContactName | Address | City | PostalCode | Country | EXPOSE – Make the services available outside the Docker Container.īelow, we’ve showcased the table data using the SELECT query, which fetches data from the requested table: mysql> select * from Customers.ADD – During build time, it will add the file into the container for future use.In the above snippet, we use four variables. ENV – We use the $ symbol to represent the environment variables in Dockerfile.Here, we are passing four user variables as build arguments. ARG – Pass variables during build time.The resultant- image is committed and used for the next steps defined in the Dockerfile. RUN – Execute the command on top of the mysql image, which subsequently forms a new layer.MAINTAINER – Set the author information as the container’s metadata that is visible through the docker inspect.In our case, we use the mysql image with the latest tag. FROM – A valid Dockerfile begins with the FROM statement, which describes the image name and version tag.Now, let’s have a glimpse of all the instructions given in the below Dockerfile snippet: RUN cp /etc/mysql/data.sql /docker-entrypoint-initdb.d RUN sed -i 's/MYSQL_DATABASE/'$MYSQL_DATABASE'/g' /etc/mysql/data.sql Our Dockerfile downloads the image from DockerHub and spins up the container with the defined variables: # cat DockerfileĮNV MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD Internally, docker-compose uses the Dockerfile in the specified path to build the image and set the environment for MySQL.
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