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[DOCS] Add Docker port warning from #48142 #50169

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Dec 18, 2019
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[DOCS] Add Docker port warning from #48142 #50169

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Add warning about possible Docker port exposure for docker-compose co…
Kovah Oct 16, 2019
a38ed7c
Update wording and spelling
Kovah Oct 16, 2019
9acae70
Update wording according to PR, replace Elasticsearch with placeholder
Kovah Dec 18, 2019
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6 changes: 6 additions & 0 deletions docs/reference/setup/install/docker.asciidoc
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Expand Up @@ -87,6 +87,12 @@ endif::[]
This sample Docker Compose file brings up a three-node {es} cluster.
Node `es01` listens on `localhost:9200` and `es02` and `es03` talk to `es01` over a Docker network.

Please note that this configuration exposes port 9200 on all network interfaces, and given how
Docker manipulates `iptables` on Linux, this means that your {es} cluster is publically accessible,
potentially ignoring any firewall settings. If you don't want to expose port 9200 and instead use
a reverse proxy, replace `9200:9200` with `127.0.0.1:9200:9200` in the docker-compose.yml file.
{es} will then only be accessible from the host machine itself.

The https://docs.docker.com/storage/volumes[Docker named volumes]
`data01`, `data02`, and `data03` store the node data directories so the data persists across restarts.
If they don't already exist, `docker-compose` creates them when you bring up the cluster.
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