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# Basic setup for the distributed NDS server
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## System requirements
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The system was built and tested on Debian 10 & 11 (note this was done while the LDAS group was determining what their next platform would be). In the future it will be packaged for a RHEL 8 variant and/or conda, but that is not ready yet.
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### Components
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The system is composed of several components
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| Component | Role | Required Instances | CPU requirements | memory requirements |
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| ------ | ------ | ------ | ------ | ------ |
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| nds-proxy | A load balancing proxy | 1 | 2+ cores | maybe 1 GB |
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|nds_metadata_server | This server tracks the channel list over time (ie channel -> frame mapping) | 1 | 4+ cores | 1-8 GB depending on channel history size |
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| nds2-io-node | This does the actual frame IO | 1+ | 1+ cores | maybe 1 GB |
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| memcached | Network aware shared cache | 1+ | 1+ cores | How ever much you want to cache |
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| diskcache server | Server that tracks frame locations | 1 | 1+ core | 1+ GB |
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## Example System
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nds.ligo-wa.caltech.edu is an example install of this server. There is a writeup in [LHO Distributed NDS Install](LHO Distributed NDS Install) that details that setup. Note that includes a new low latency connection that is not documented in this document.
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## CDS Repositories
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To install the repositories (Debian 10 example):
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<code>
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wget https://apt.ligo-wa.caltech.edu/debian/pool/buster-testing/cdssoft-testing/cdssoft-testing-buster_1.0.6_all.deb
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dpkg -i ./cdssoft-testing-buster_1.0.6_all.deb
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apt-get update
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</code>
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### For Debian 11
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Note this also works w/ Debian 11, use https://apt.ligo-wa.caltech.edu/debian/pool/bullseye/cdssoft-testing/cdssoft-testing-bullseye_1.0.8_all.deb for the repository setup.
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