Migration From an Existing Database(2) | Laravel

How to sync data from the existing database

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Intro

I got a mission to clone an existing service, which has its database separately from the original.

Here is my to-do list:

  1. create tables
  2. sync data

This article will focus on how to sync data. To read how to create tables from the old database check out here.

Laravel Database Sync

I found this great tool to do this task: https://github.com/waelwalid/laravel-database-sync

Please follow the instructions to install the tool.

Adjustments

I run my app in a php-fpm-alpine docker container so some adjustments need to do or the tool won’t work.

  1. Make the container can run the shell scripts
  2. Install mysql-client
  3. Disable LOCK TABLE if you are NOT a root user in the synced database when executing mysqldump

1. Make the container can run the shell scripts

The sync-tool is implemented by shell scripts, and with the header, #!/bin/bash, so only bash can run it.

And since I used an alpine image, which doesn’t have the Bash installed by default so I had two options:

  1. Change the header to #!/bin/sh
  2. Install Bash or just use an Ubuntu image for convenience
# add this to the Dockerfile
RUN apk add --no-cache --upgrade bash

2. Install mysql-client

Still, by default, the alpine image doesn’t come with mysql-client, which is used in the shell script so we need to install it.

apk add --no-cache mysql-client

3. Disable LOCK TABLE if you are NOT a root user in the synced database

Since I sync the data using a user who ONLY has SELECT privilege, I need to disable LOCK TABLE, and PROCESS when dumping the data.

Open vendor/waelwalid/laravel-database-sync/database-update.sh.

Add --single-transaction=TRUE --no-tablespaces after mysqldump command.

Like this: mysqldump -v --single-transaction=TRUE --no-tablespaces -h $REMOTE_DATABASE_HOST -u $REMOTE_DATABASE_USER -p$REMOTE_DATABASE_PASS $REMOTE_DATABASE_NAME > $CONFIG/dumps/remote-database-$CURRENT_TIME.sql

If you use login as root, or other users with LOCK TABLE, and PROCESS privileges, you can skip this step.

Quote from the document:

mysqldump requires at least the SELECT privilege for dumped tables, SHOW VIEW for dumped views, TRIGGER for dumped triggers, LOCK TABLES if the — single-transaction option is not used, and (as of MySQL 8.0.21) PROCESS if the — no-tablespaces option is not used. Certain options might require other privileges as noted in the option descriptions.

Check out for more details about mysqldump

After all

Now you can run composer database-update to sync the data,
or just execute bash ./vendor/waelwalid/laravel-database-sync/database-update.sh which is the same, cheers :)

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