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----
-title: "Database and cache"
-description: "mCaptcha server requires dependencies like a Postgres
-database and a Redis cache"
-lead: "mCaptcha server requires dependencies like a Postgres
-database and a Redis cache"
-date: 2021-07-21 14:49
-lastmod: 2021-07-21 14:49
-draft: false
-images: []
-menu:
-  docs:
-    parent: "Self-Hosting"
-weight: 535
-toc: true
----
-
-## Notes
-
-### Database
-
-- Database migrations are baked into the server binary so don't worry
-about them.
-
-- When compiling from source, unset database configuration(comment out
-database configuration/ `unset` relevant environment variables).
-`mCaptcha` uses [`sqlx`](https://crates.io/crates/sqlx) database client
-library which checks SQL queries at compile time. So if you are starting
-with a fresh database without migrations applied, compilation will fail.
-
-### Redis
-
-- Redis is an optional dependency. Currently, the non-Redis configuration
-doesn't persist CAPTCHA heat. So if there's a systems failure, CAPTCHA
-heat will be reset and visitor count will start from 0. For small
-installations, this should post a problem as heat is short lived and is
-reset anyways at cool down period.
-
-- mCaptcha uses a custom Redis module called
-[cache](https://github.com/mCaptcha/cache) to overcome some of Redis'
-limitations.
-
-
-## Instructions
-
-Once again, there are two ways to go about this:
-
-1. Docker
-2. Bare metal
-
-### Docker
-
-### Database
-
-Download and run Postgres
-
-```bash
-docker create --name mcaptcha-postgres \
-  -e POSTGRES_PASSWORD=<database-password> \
-  -p 5432:5432 \
-  postgres && docker start mcaptcha-postgres
-```
-
-### Redis
-
-```bash
-docker create --name mcaptcha-cache \
-  -p 6379:6379 \
-  mcaptcha/cache && docker start mcaptcha-cache
-```
-
-See [mCaptcha/cache](https://github.com/mCaptcha/cache) for more
-details.
-
-### 1. Install Postgres if you don't have it already.
-
-For Debian based distributions:
-
-```bash
-sudo apt install postgres
-```
-
-### 2. Create new user for running `mCaptcha`
-
-```bash
-$ sudo useradd -b /srv -m -s /usr/bin/bash mcaptcha
-```
-
-### 3. Create new user in Postgres
-
-```bash
-$ sudo -iu postgres # switch to `postgres` user
-$ psql
-postgres=#  CREATE USER mcaptcha WITH PASSWORD 'my super long password and yes you need single quote';
-$  createdb -O mcaptcha mcaptcha # create db 'mcaptcha' with 'mcaptcha' as owner
-```
-
-### 4. Install [`mCaptcha/cache`](https://github.com/mCaptcha/cache)
-
-See [`mCaptcha/cache`](https://github.com/mCaptcha/cache) for more
-details.