244 lines
8.1 KiB
Markdown
244 lines
8.1 KiB
Markdown
---
|
||
layout: default
|
||
title: Cross-cluster search
|
||
parent: Access control
|
||
nav_order: 105
|
||
redirect_from:
|
||
- /security/access-control/cross-cluster-search/
|
||
- /security-plugin/access-control/cross-cluster-search/
|
||
---
|
||
|
||
# Cross-cluster search
|
||
|
||
Cross-cluster search is exactly what it sounds like: it lets any node in a cluster execute search requests against other clusters. The Security plugin supports cross-cluster search out of the box.
|
||
|
||
---
|
||
|
||
#### Table of contents
|
||
1. TOC
|
||
{:toc}
|
||
|
||
|
||
---
|
||
|
||
## Authentication flow
|
||
|
||
When accessing a *remote cluster* from a *coordinating cluster* using cross-cluster search:
|
||
|
||
1. The Security plugin authenticates the user on the coordinating cluster.
|
||
1. The Security plugin fetches the user's backend roles on the coordinating cluster.
|
||
1. The call, including the authenticated user, is forwarded to the remote cluster.
|
||
1. The user's permissions are evaluated on the remote cluster.
|
||
|
||
You can have different authentication and authorization configurations on the remote and coordinating cluster, but we recommend using the same settings on both.
|
||
|
||
|
||
## Permissions
|
||
|
||
To query indexes on remote clusters, users need to have `READ` or `SEARCH` permissions. Furthermore, when the search request includes the query parameter `ccs_minimize_roundtrips=false` – which tells OpenSearch not to minimize outgoing and ingoing requests to remote clusters – users need to have the following additional permission for the index:
|
||
|
||
```
|
||
indices:admin/shards/search_shards
|
||
```
|
||
|
||
For more information about the `ccs_minimize_roundtrips` parameter, see the list of [URL Parameters]({{site.url}}{{site.baseurl}}/api-reference/search/#url-parameters) for the Search API.
|
||
|
||
#### Sample roles.yml configuration
|
||
|
||
```yml
|
||
humanresources:
|
||
cluster:
|
||
- CLUSTER_COMPOSITE_OPS_RO
|
||
indices:
|
||
'humanresources':
|
||
'*':
|
||
- READ
|
||
- indices:admin/shards/search_shards # needed when the search request includes parameter setting 'ccs_minimize_roundtrips=false'.
|
||
```
|
||
|
||
|
||
#### Sample role in OpenSearch Dashboards
|
||
|
||
|
||
|
||
|
||
## Walkthrough
|
||
|
||
Save this file as `docker-compose.yml` and run `docker-compose up` to start two single-node clusters on the same network:
|
||
|
||
```yml
|
||
version: '3'
|
||
services:
|
||
opensearch-ccs-node1:
|
||
image: opensearchproject/opensearch:{{site.opensearch_version}}
|
||
container_name: opensearch-ccs-node1
|
||
environment:
|
||
- cluster.name=opensearch-ccs-cluster1
|
||
- discovery.type=single-node
|
||
- bootstrap.memory_lock=true # along with the memlock settings below, disables swapping
|
||
- "OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m" # minimum and maximum Java heap size, recommend setting both to 50% of system RAM
|
||
ulimits:
|
||
memlock:
|
||
soft: -1
|
||
hard: -1
|
||
volumes:
|
||
- opensearch-data1:/usr/share/opensearch/data
|
||
ports:
|
||
- 9200:9200
|
||
- 9600:9600 # required for Performance Analyzer
|
||
networks:
|
||
- opensearch-net
|
||
|
||
opensearch-ccs-node2:
|
||
image: opensearchproject/opensearch:{{site.opensearch_version}}
|
||
container_name: opensearch-ccs-node2
|
||
environment:
|
||
- cluster.name=opensearch-ccs-cluster2
|
||
- discovery.type=single-node
|
||
- bootstrap.memory_lock=true # along with the memlock settings below, disables swapping
|
||
- "OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m" # minimum and maximum Java heap size, recommend setting both to 50% of system RAM
|
||
ulimits:
|
||
memlock:
|
||
soft: -1
|
||
hard: -1
|
||
volumes:
|
||
- opensearch-data2:/usr/share/opensearch/data
|
||
ports:
|
||
- 9250:9200
|
||
- 9700:9600 # required for Performance Analyzer
|
||
networks:
|
||
- opensearch-net
|
||
|
||
volumes:
|
||
opensearch-data1:
|
||
opensearch-data2:
|
||
|
||
networks:
|
||
opensearch-net:
|
||
```
|
||
|
||
After the clusters start, verify the names of each:
|
||
|
||
```json
|
||
curl -XGET -u 'admin:admin' -k 'https://localhost:9200'
|
||
{
|
||
"cluster_name" : "opensearch-ccs-cluster1",
|
||
...
|
||
}
|
||
|
||
curl -XGET -u 'admin:admin' -k 'https://localhost:9250'
|
||
{
|
||
"cluster_name" : "opensearch-ccs-cluster2",
|
||
...
|
||
}
|
||
```
|
||
|
||
Both clusters run on `localhost`, so the important identifier is the port number. In this case, use port 9200 (`opensearch-ccs-node1`) as the remote cluster, and port 9250 (`opensearch-ccs-node2`) as the coordinating cluster.
|
||
|
||
To get the IP address for the remote cluster, first identify its container ID:
|
||
|
||
```bash
|
||
docker ps
|
||
CONTAINER ID IMAGE PORTS NAMES
|
||
6fe89ebc5a8e opensearchproject/opensearch:{{site.opensearch_version}} 0.0.0.0:9200->9200/tcp, 0.0.0.0:9600->9600/tcp, 9300/tcp opensearch-ccs-node1
|
||
2da08b6c54d8 opensearchproject/opensearch:{{site.opensearch_version}} 9300/tcp, 0.0.0.0:9250->9200/tcp, 0.0.0.0:9700->9600/tcp opensearch-ccs-node2
|
||
```
|
||
|
||
Then get that container's IP address:
|
||
|
||
```bash
|
||
docker inspect --format='{% raw %}{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}{% endraw %}' 6fe89ebc5a8e
|
||
172.31.0.3
|
||
```
|
||
|
||
On the coordinating cluster, add the remote cluster name and the IP address (with port 9300) for each "seed node." In this case, you only have one seed node:
|
||
|
||
```json
|
||
curl -k -XPUT -H 'Content-Type: application/json' -u 'admin:admin' 'https://localhost:9250/_cluster/settings' -d '
|
||
{
|
||
"persistent": {
|
||
"cluster.remote": {
|
||
"opensearch-ccs-cluster1": {
|
||
"seeds": ["172.31.0.3:9300"]
|
||
}
|
||
}
|
||
}
|
||
}'
|
||
```
|
||
|
||
On the remote cluster, index a document:
|
||
|
||
```bash
|
||
curl -XPUT -k -H 'Content-Type: application/json' -u 'admin:admin' 'https://localhost:9200/books/_doc/1' -d '{"Dracula": "Bram Stoker"}'
|
||
```
|
||
|
||
At this point, cross-cluster search works. You can test it using the `admin` user:
|
||
|
||
```bash
|
||
curl -XGET -k -u 'admin:admin' 'https://localhost:9250/opensearch-ccs-cluster1:books/_search?pretty'
|
||
{
|
||
...
|
||
"hits": [{
|
||
"_index": "opensearch-ccs-cluster1:books",
|
||
"_id": "1",
|
||
"_score": 1.0,
|
||
"_source": {
|
||
"Dracula": "Bram Stoker"
|
||
}
|
||
}]
|
||
}
|
||
```
|
||
|
||
To continue testing, create a new user on both clusters:
|
||
|
||
```bash
|
||
curl -XPUT -k -u 'admin:admin' 'https://localhost:9200/_plugins/_security/api/internalusers/booksuser' -H 'Content-Type: application/json' -d '{"password":"password"}'
|
||
curl -XPUT -k -u 'admin:admin' 'https://localhost:9250/_plugins/_security/api/internalusers/booksuser' -H 'Content-Type: application/json' -d '{"password":"password"}'
|
||
```
|
||
|
||
Then run the same search as before with `booksuser`:
|
||
|
||
```json
|
||
curl -XGET -k -u booksuser:password 'https://localhost:9250/opensearch-ccs-cluster1:books/_search?pretty'
|
||
{
|
||
"error" : {
|
||
"root_cause" : [
|
||
{
|
||
"type" : "security_exception",
|
||
"reason" : "no permissions for [indices:admin/shards/search_shards, indices:data/read/search] and User [name=booksuser, roles=[], requestedTenant=null]"
|
||
}
|
||
],
|
||
"type" : "security_exception",
|
||
"reason" : "no permissions for [indices:admin/shards/search_shards, indices:data/read/search] and User [name=booksuser, roles=[], requestedTenant=null]"
|
||
},
|
||
"status" : 403
|
||
}
|
||
```
|
||
|
||
Note the permissions error. On the remote cluster, create a role with the appropriate permissions, and map `booksuser` to that role:
|
||
|
||
```bash
|
||
curl -XPUT -k -u 'admin:admin' -H 'Content-Type: application/json' 'https://localhost:9200/_plugins/_security/api/roles/booksrole' -d '{"index_permissions":[{"index_patterns":["books"],"allowed_actions":["indices:admin/shards/search_shards","indices:data/read/search"]}]}'
|
||
curl -XPUT -k -u 'admin:admin' -H 'Content-Type: application/json' 'https://localhost:9200/_plugins/_security/api/rolesmapping/booksrole' -d '{"users" : ["booksuser"]}'
|
||
```
|
||
|
||
Both clusters must have the user, but only the remote cluster needs the role and mapping; in this case, the coordinating cluster handles authentication (i.e. "Does this request include valid user credentials?"), and the remote cluster handles authorization (i.e. "Can this user access this data?").
|
||
{: .tip }
|
||
|
||
Finally, repeat the search:
|
||
|
||
```bash
|
||
curl -XGET -k -u booksuser:password 'https://localhost:9250/opensearch-ccs-cluster1:books/_search?pretty'
|
||
{
|
||
...
|
||
"hits": [{
|
||
"_index": "opensearch-ccs-cluster1:books",
|
||
"_id": "1",
|
||
"_score": 1.0,
|
||
"_source": {
|
||
"Dracula": "Bram Stoker"
|
||
}
|
||
}]
|
||
}
|
||
```
|