> For the complete documentation index, see [llms.txt](https://nighthawkapps.gitbook.io/zcash-explorer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nighthawkapps.gitbook.io/zcash-explorer/about/env-variables.md).

# ENV Variables

This project using ENV variables to store config in the prod environment.

env var list

```
SECRET_KEY_BASE=ahZc9YkWjt+/QHv1WvZFQAZyDCShIXNzP6HMd1cA6EOOiKV4RYWMXolZ4FEG3nPN
ZCASHD_HOSTNAME=127.0.0.1
ZCASHD_PORT=8232
ZCASHD_USERNAME=user
ZCASHD_PASSWORD=changeme
EXPLORER_HOSTNAME=https://zcashblockexplorer.com
VK_CPUS='0.3'
VK_MEM='1024M'
VK_RUNNER_IMAGE='nighthawkapps/vkrunner'
EXPLORER_SCHEME='https'
```

be sure that you are using a strong  `SECRET_KEY_BASE`

*minimum length needed is 32.*

*you can generate an acceptable secret using ( once you have all the dependencies installed )*

```
mix phx.gen.secret
```

 `VK_CPUS` and `VK_MEM` control how much CPU and RAM is assigned for an individual Viewing Key Import Job.

`VK_RUNNER_IMAGE` is the Docker image that will be used to run the Viewing Key.

{% hint style="info" %}
If you running the explorer as a Docker container, the Viewing Key Image has to updated to [dind](https://hub.docker.com/_/docker) based image.
{% endhint %}

On non docker based Prod env

you can create  a .env file ( added to .gitignore in this project ) and source it.

example:

```
export SECRET_KEY_BASE=ahZc9YkWjt+/QHv1WvZFQAZyDCShIXNzP6HMd1cA6EOOiKV4RYWMXolZ4FEG3nPN
export ZCASHD_HOSTNAME=127.0.0.1
export ZCASHD_PORT=8232
export ZCASHD_USERNAME=user
export ZCASHD_PASSWORD=changeme
export EXPLORER_HOSTNAME=https://zcashblockexplorer.com
export VK_CPUS='0.3'
export VK_MEM='1024M'
export VK_RUNNER_IMAGE='nighthawkapps/vkrunner'
export EXPLORER_SCHEME='https'
```

`source .env`

in the dev env, you can edit `config/dev.exs` to update the config.


---

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