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docs/Cluster-VictoriaMetrics.md: add a chapter describing a toy cluster setup on a single host

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While at it, refer to available tools, which can simplify cluster setup
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Aliaksandr Valialkin 2021-07-02 10:43:22 +03:00
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@ -138,7 +138,7 @@ A minimal cluster must contain the following nodes:
It is recommended to run at least two nodes for each service
for high availability purposes.
An http load balancer such as [vmauth](https://docs.victoriametrics.com/vmauth.html) or `nginx` must be put in front of `vminsert` and `vmselect` nodes:
An http load balancer such as [vmauth](https://docs.victoriametrics.com/vmauth.html) or `nginx` must be put in front of `vminsert` and `vmselect` nodes. It must contain the following routing configs according to [the url format](#url-format):
- requests starting with `/insert` must be routed to port `8480` on `vminsert` nodes.
- requests starting with `/select` must be routed to port `8481` on `vmselect` nodes.
@ -146,6 +146,18 @@ Ports may be altered by setting `-httpListenAddr` on the corresponding nodes.
It is recommended setting up [monitoring](#monitoring) for the cluster.
The following tools can siplify cluster setup:
* [An example docker-compose config for VictoriaMetrics cluster](https://github.com/VictoriaMetrics/VictoriaMetrics/blob/cluster/deployment/docker/docker-compose.yml)
* [Helm charts for VictoriaMetrics](https://github.com/VictoriaMetrics/helm-charts)
* [Kubernetes operator for VictoriaMetrics](https://github.com/VictoriaMetrics/operator)
It is possible manualy setting up a toy cluster on a single host. In this case every cluster component - `vminsert`, `vmselect` and `vmstorage` - must have distinct values for `-httpListenAddr` command-line flag. This flag specifies http address for accepting http requests for [monitoring](#monitoring) and [profiling](#profiling). `vmstorage` node must have distinct values for the following additional command-line flags in order to prevent resource usage clash:
* `-storageDataPath` - every `vmstorage` node must have a dedicated data storage.
* `-vminsertAddr` - every `vmstorage` node must listen for a distinct tcp address for accepting data from `vminsert` nodes.
* `-vmselectAddr` - every `vmstorage` node must listen for a distinct tcp address for accepting requests from `vmselect` nodes.
### Environment variables
Each flag values can be set thru environment variables by following these rules: