Merge pull request #243 from ricardolstephen/master

Document instructions for running Performance Analyzer on a tarball

Author: aetter

docs/install/tar.md

@@ -67,3 +67,22 @@ You can modify `config/elasticsearch.yml` or specify environment variables as ar
 ```
 
 For other settings, see [Important settings](../docker/#important-settings).
+
+
+## Performance Analyzer
+
+In a tarball installation, Performance Analyzer collects data when it is enabled. But, in order to read that data over a REST API on port 9600, you must first manually launch the associated reader agent process:
+
+1. Create `./bin/performance-analyzer-agent-cli` based on [this file](https://github.com/opendistro-for-elasticsearch/performance-analyzer/blob/master/packaging/performance-analyzer-agent-cli).
+
+1. Make the CLI executable:
+
+   ```bash
+   sudo chmod +x /usr/share/elasticsearch/bin/performance-analyzer-agent-cli
+   ```
+
+1. Launch the agent CLI:
+
+   ```bash
+   ES_HOME="$PWD" ./bin/performance-analyzer-agent-cli
+   ```