8000 Added Disable Default User example to the hardening guide by DougTidwell · Pull Request #1840 · Altinity/clickhouse-operator · GitHub
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Added Disable Default User example to the hardening guide #1840

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Merged
alex-zaitsev merged 2 commits into from
Oct 7, 2025
Merged

Added Disable Default User example to the hardening guide #1840

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f28b41a
Updated Helm repo location to https://helm.altinity.com
DougTidwell Sep 30, 2025
028c311
Added recommendation to disable the default user with a sample XML file
DougTidwell Oct 6, 2025
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2 changes: 1 addition & 1 deletion deploy/grafana/grafana-with-helm/install-grafana-via-helm.sh
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Expand Up @@ -2,7 +2,7 @@
# reproduce behavior for https://github.com/Altinity/clickhouse-operator/issues/1721
kubectl create ns test

helm repo add altinity-clickhouse-operator https://docs.altinity.com/clickhouse-operator/
helm repo add altinity-clickhouse-operator https://helm.altinity.com
helm install -n test test-operator --set dashboards.enabled=true altinity-clickhouse-operator/altinity-clickhouse-operator

helm repo add grafana https://grafana.github.io/helm-charts
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2 changes: 1 addition & 1 deletion docs/operator_installation_details.md
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Expand Up @@ -59,7 +59,7 @@ since 0.20.1 version official clickhouse-operator helm chart, also available

installation
```bash
helm repo add clickhouse-operator https://docs.altinity.com/clickhouse-operator/
helm repo add clickhouse-operator https://helm.altinity.com
helm install clickhouse-operator clickhouse-operator/altinity-clickhouse-operator
```
upgrade
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12 changes: 11 additions & 1 deletion docs/security_hardening.md
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Expand Up @@ -10,7 +10,17 @@ With the default settings, the ClickHouse operator deploys ClickHouse with two u

The '**default**' user is used to connect to ClickHouse instance from a pod where it is running, and also for distributed queries. It is deployed with an **empty password** that was a long-time default for ClickHouse out-of-the-box installation.

To secure it, the operator applies network security rules that restrict connections to the pods running the ClickHouse cluster, and nothing else.
For security purposes, we recommend that you disable the `default` user altogether. As an example, create a file named `remove_default_user.xml` and place it in the `users.d` directory. This markup does the trick:

```xml
<clickhouse>
<users>
<default remove="1"/>
</users>
</clickhouse>
```

However, if you do use the `default` user, the operator applies network security rules that restrict connections to the pods running the ClickHouse cluster, and nothing els 4BB7 e.

Before version **0.19.0** `hostRegexp` was applied that captured pod names. This did not work correctly in some Kubernetes distributions, such as GKE. In later versions, the operator additionally applies a restrictive set of pod IP addresses and rebuilds this set if the IP address of a pod changes for whatever reason.

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