# Concepts

> Historical documentation restored from the Pigsty v1.5.1 tag.
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## Index

| [Module](/docs/c-arch/#module) | [Concept](/docs/c-concept/) | [Deploy](/docs/d-deploy/) | [Config](/docs/v-config/) | [Playbook](/docs/p-playbook/) |
| :---: | :--: | :--: |  :--: | :--: |
| `INFRA` | [Concept: INFRA](/docs/c-infra/)     | [Deploy: INFRA](/docs/d-deploy/) | [Config: INFRA](/docs/v-infra/) | [Playbook: INFRA](/docs/p-infra/)|
| `NODES` | [Concept: NODES](/docs/c-nodes/)     | [Deploy: NODES](/docs/d-prepare/) | [Config: NODES](/docs/v-nodes/) | [Playbook: NODES](/docs/p-nodes/)|
| `PGSQL` | [Concept: PGSQL](/docs/c-pgsql/)     | [Deploy: PGSQL](/docs/d-pgsql/)     | [Config: PGSQL](/docs/v-pgsql/) | [Playbook: PGSQL](/docs/p-pgsql/)|
| `REDIS` | [Concept: REDIS](/docs/c-redis/)     | [Deploy: REDIS](/docs/d-redis/)     | [Config: REDIS](/docs/v-redis/) | [Playbook: REDIS](/docs/p-redis/)|


## Glossary

> Node

> Meta

> Source Package

> Offline Software Package

> Sandbox

>  Production Environment/Prod Env

> Singleton Meta

> Cluster Manage

> Database Cluster

> Sandbox

> Provisioning

> Admin Uesr

> Admin Provisioning

> Software Provisioning

> Configure

> Inventory

> Config Entry

> Cluster

> Instance

> Service

> Sharding Cluster

> Playbook

> Deploy/Deployment

> Primary

> Replica

> Standby

> Offline

> Delayed

> Hot Standby

> Cold Standby

> Restore

> Alert/Alerting

> Metric/Metrics

> Dashboard

> Panel

> Monitor Target

> Monly
> Identity


> Identity Parameter

> HealthCheck

> Service Discovery

> Redis Standalone

> Redis Native Cluster

> Redis Sentinel