Adds tarball installation

Author: aetter

docs/install/index.md

@@ -7,4 +7,4 @@ has_children: true
 
 # Install and configure Open Distro for Elasticsearch
 
-Open Distro for Elasticsearch has several download options: Docker image, RPM package, and Debian package.
+Open Distro for Elasticsearch has several download options: Docker image, RPM package, Debian package, and tarball.

docs/install/tar.md

@@ -0,0 +1,65 @@
+---
+layout: default
+title: Tarball
+parent: Install and Configure
+nav_order: 4
+---
+
+# Tarball
+
+The tarball installation works on Linux systems and provides a self-contained directory with everything you need to run Open Distro for Elasticsearch, including an integrated Java Development Kit (JDK). The tarball is a good option for quick testing, but we recommend Docker or a package manager for production deployments.
+
+1. Download the tarball:
+
+   ```bash
+   curl https://d3g5vo6xdbdb9a.cloudfront.net/tarball/opendistro-elasticsearch/opendistroforelasticsearch-1.2.0.tar.gz -o opendistroforelasticsearch-1.2.0.tar.gz
+   ```
+
+1. Download the checksum:
+
+   ```bash
+   curl https://d3g5vo6xdbdb9a.cloudfront.net/tarball/opendistro-elasticsearch/opendistroforelasticsearch-1.2.0.tar.gz.sha512 -o opendistroforelasticsearch-1.2.0.tar.gz.sha512
+   ```
+
+1. Verify the tarball against the checksum:
+
+   ```bash
+   shasum -a 512 -c opendistroforelasticsearch-1.2.0.tar.gz.sha512
+   ```
+
+   On CentOS, you might not have `shasum`. Install this package:
+
+   ```bash
+   sudo yum install perl-Digest-SHA
+   ```
+
+1. Extract the TAR file to a directory and change to that directory:
+
+   ```bash
+   tar -zxvf opendistroforelasticsearch-1.2.0.tar.gz
+   cd opendistroforelasticsearch-1.2.0
+   ```
+
+1. Run Open Distro for Elasticsearch:
+
+   ```bash
+   ./opendistro-tar-install.sh
+   ```
+
+1. Open a second terminal session, and send requests to the server to verify that Open Distro for Elasticsearch is up and running:
+
+   ```bash
+   curl -XGET https://localhost:9200 -u admin:admin --insecure
+   curl -XGET https://localhost:9200/_cat/plugins?v -u admin:admin --insecure
+   ```
+
+
+## Configuration
+
+You can modify `config/elasticsearch.yml` or specify environment variables as arguments using `-E`:
+
+```bash
+./opendistro-tar-install.sh -Ecluster.name=odfe-cluster -Enode.name=odfe-node1 -Ehttp.host=0.0.0.0 -Ediscovery.type=single-node
+```
+
+For other settings, see [Important settings](../docker/#important-settings).