86 lines
2.6 KiB
Markdown
86 lines
2.6 KiB
Markdown
title: Environment Types
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summary: Configure your SilverStripe environment to define how your web application behaves.
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# Environment Types
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SilverStripe knows three different environment types (or "modes"). Each of the modes gives you different tools
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and behaviors. The environment is managed by the `SS_ENVIRONMENT_TYPE` variable through an
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[environment configuration file](../../getting_started/environment_management).
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The three environment types you can set are `dev`, `test` and `live`.
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### Dev
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When developing your websites, adding page types or installing modules you should run your site in `dev`. In this mode
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you will see full error back traces and view the development tools without having to be logged in as an administrator
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user.
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<div class="alert" markdown="1">
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**dev mode should not be enabled long term on live sites for security reasons**. In dev mode by outputting back traces
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of function calls a hacker can gain information about your environment (including passwords) so you should use dev mode
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on a public server very carefully.
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</div>
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### Test Mode
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Test mode is designed for staging environments or other private collaboration sites before deploying a site live.
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In this mode error messages are hidden from the user and SilverStripe includes [BasicAuth](api:SilverStripe\Security\BasicAuth) integration if you
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want to password protect the site. You can enable that by adding this to your `mysite/_config/app.yml` file:
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```yml
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---
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Only:
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environment: 'test'
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---
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SilverStripe\Security\BasicAuth:
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entire_site_protected: true
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```
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### Live Mode
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All error messages are suppressed from the user and the application is in it's most *secure* state.
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<div class="alert">
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Live sites should always run in live mode. You should not run production websites in dev mode.
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</div>
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## Checking Environment Type
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You can check for the current environment type in [config files](../configuration) through the `environment` variant.
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**mysite/_config/app.yml**
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```yml
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---
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Only:
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environment: 'live'
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---
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MyClass:
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myvar: live_value
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---
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Only:
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environment: 'test'
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---
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MyClass:
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myvar: test_value
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```
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Checking for what environment you're running in can also be done in PHP. Your application code may disable or enable
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certain functionality depending on the environment type.
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```php
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use SilverStripe\Control\Director;
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if (Director::isLive()) {
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// is in live
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} elseif (Director::isTest()) {
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// is in test mode
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} elseif (Director::isDev()) {
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// is in dev mode
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}
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```
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## Related Lessons
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* [Advanced environment configuration](https://www.silverstripe.org/learn/lessons/v4/advanced-environment-configuration-1)
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