> For the complete documentation index, see [llms.txt](https://jembi.gitbook.io/openhim-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jembi.gitbook.io/openhim-platform/packages/interoperability-layer-openhim/environment-variables.md).

# Environment Variables

Listed in this page are all environment variables needed to run the interoperability layer Openhim.

<table><thead><tr><th width="213">Variable Name</th><th width="96">Type</th><th width="208">Relevance</th><th width="102">Required</th><th>Default</th></tr></thead><tbody><tr><td>OPENHIM_CORE_MEDIATOR_HOSTNAME</td><td>String</td><td>Hostname of the Openhim mediator</td><td>Yes</td><td>localhost</td></tr><tr><td>OPENHIM_MEDIATOR_API_PORT</td><td>Number</td><td>Port of the Openhim mediator</td><td>Yes</td><td>8080</td></tr><tr><td>OPENHIM_CORE_INSTANCES</td><td>Number</td><td>Number of openhim-core instances</td><td>No</td><td>1</td></tr><tr><td>OPENHIM_CONSOLE_INSTANCES</td><td>String</td><td>Number of openhim-console instances</td><td>No</td><td>1</td></tr><tr><td>OPENHIM_MONGO_URL</td><td>String</td><td>MongoDB connection string</td><td>Yes</td><td>mongodb://mongo-1:27017/openhim</td></tr><tr><td>OPENHIM_MONGO_ATNAURL</td><td>String</td><td>???????????</td><td>Yes</td><td>mongodb://mongo-1:27017/openhim</td></tr><tr><td>OPENHIM_CPU_LIMIT</td><td>Number</td><td>CPU limit usage for openhim-core</td><td>No</td><td>0</td></tr><tr><td>OPENHIM_CPU_RESERVE</td><td>Number</td><td>Reserverd CPU usage for openhim-core</td><td>No</td><td>0.05</td></tr><tr><td>OPENHIM_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit for openhim-core</td><td>No</td><td>3G</td></tr><tr><td>OPENHIM_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM for openhim-core</td><td>No</td><td>500M</td></tr><tr><td>OPENHIM_CONSOLE_CPU_LIMIT</td><td>Number</td><td>CPU limit usage for openhim-console</td><td>No</td><td>0</td></tr><tr><td>OPENHIM_CONSOLE_CPU_RESERVE</td><td>Number</td><td>Reserverd CPU usage for openhim-console</td><td>No</td><td>0.05</td></tr><tr><td>OPENHIM_CONSOLE_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit for openhim-console</td><td>No</td><td>2G</td></tr><tr><td>OPENHIM_CONSOLE_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM for openhim-console</td><td>No</td><td>500M</td></tr><tr><td>OPENHIM_MONGO_CPU_LIMIT</td><td>Number</td><td>CPU limit usage for mongo</td><td>No</td><td>0</td></tr><tr><td>OPENHIM_MONGO_CPU_RESERVE</td><td>Number</td><td>Reserverd CPU usage for mongo</td><td>No</td><td>0.05</td></tr><tr><td>OPENHIM_MONGO_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit for mongo</td><td>No</td><td>3G</td></tr><tr><td>OPENHIM_MONGO_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM for mongo</td><td>No</td><td>500M</td></tr><tr><td>MONGO_SET_COUNT</td><td>Number</td><td>Number of instances of Mongo</td><td>YES</td><td>1</td></tr></tbody></table>


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