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Securing ClickHouse starts with assigning ownership. Self-managed operators must protect the hosts, cloud accounts, network, credentials, patches and database configuration. ClickHouse Cloud manages parts of the service platform, while BYOC leaves additional cloud-infrastructure duties with the customer. In every model, you still own your data, identities and access decisions. Use the checklist below before exposing a production cluster.
Start with the deployment model and a written responsibility map
Security controls fail when nobody is clearly accountable for them. Record who owns each item before deployment: operating-system hardening, container or virtual-machine maintenance, ClickHouse upgrades, cloud-account security, network controls, identity administration, encryption settings, logging, vulnerability response and backup recovery.
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| Deployment model | Infrastructure and platform operations | Customer responsibilities | Operational trade-off |
|---|---|---|---|
| Self-managed ClickHouse | Your team operates the hosts, operating system, containers, network, storage and ClickHouse installation. | You administer identities, privileges, data, encryption configuration, logs, patches and incident response. | Maximum control, but the broadest security workload. |
| ClickHouse Cloud | ClickHouse operates the managed service platform and describes its own network, infrastructure and application security controls in its Information Security Addendum. | You manage your data and access. The addendum states: “For the Cloud Services, customers are responsible for managing their data and access.” | Less platform maintenance, with customer evidence and access-management duties still required. |
| BYOC | ClickHouse provides the service software, while the customer retains additional cloud-infrastructure security and management duties in its own account. | You manage data, access and the retained cloud controls, including the surrounding account and network configuration. | A compromise between managed software operations and customer-owned infrastructure. |
The ClickHouse Information Security Addendum effective October 7, 2026 applies to the ClickHouse Cloud and specified BYOC scope. Its commitments are not defaults for a self-managed server. Treat the addendum as evidence of the managed service’s stated controls, not as a substitute for your own threat model or configuration review.
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For every control, name an owner, backup owner, verification method and escalation path. Keep architecture diagrams, approved network rules, role definitions, certificate inventories, patch records and recovery-test results where your security and compliance teams can review them. A responsibility matrix is useful only if it answers who performs the action, who checks it and what happens when the check fails.
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Cloud customers should document which provider evidence they can obtain and which evidence they must produce themselves. For BYOC, include the cloud account, identity provider, subnets, security groups, storage and key-management services in the same review as ClickHouse. For a self-managed cluster, include the operating system, container runtime, orchestrator and physical or virtual host controls.
Build least-privilege identities instead of sharing an administrator
Create separate named accounts for people, applications, automation and break-glass administration. Roles can contain privileges, settings, constraints and other assigned roles, so they provide a repeatable way to grant access without editing every user individually.
Separate human and service access
- Give each engineer an individual account so activity can be attributed and removed when employment or duties change.
- Give every application its own service account; never reuse a human credential in a deployment pipeline.
- Use a small, protected administrative role for schema and security changes, and narrower roles for ingestion, reporting and operations.
- Store credentials in the secret-management system appropriate to your environment, rotate them, and remove unused accounts and grants.
- Review effective permissions periodically with
SHOW GRANTSand revoke privileges that are no longer needed. - Document why each elevated privilege exists, who approved it and when it must be reviewed again.
Use the ClickHouse version’s access-control documentation when choosing authentication plugins, password handling and configuration syntax. Rolling documentation and server releases can change available options.
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Use row policies only within their documented limits
Row policies filter rows available to a user or role, but they are not a universal tenant-isolation boundary. The documentation describes them as meaningful with read-only access; write privileges or partition-copy capabilities can defeat the intended restriction. Distributed and remote-backed tables add further design concerns: the policy must be applied to the underlying tables and the complete query path must be tested.
Before relying on a policy, test direct reads, distributed reads, inserts, mutations, remote-table access, materialized views and administrative paths with the exact server version and role combination used in production. If a user can write, copy partitions or reach an underlying table without the policy, use stronger physical or account-level separation rather than assuming the filter is sufficient.
Review access as a lifecycle
Grant access through roles rather than one-off user exceptions whenever possible. When a person changes teams, remove the old role before adding the new one and verify the resulting grants. When an application is retired, disable its account, remove scheduled jobs and delete its unused credentials. Keep a protected emergency administrator, but require an auditable reason for using it and review its grants after every incident or maintenance event.
Handle the default user deliberately
A fresh ClickHouse installation creates only the default user. That account is also used for inter-node communication by default, so deleting or disabling it immediately can break a cluster or leave administrators without a working replacement.
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- Create and test a named SQL administrator with the privileges required to manage users, roles, schemas and settings.
- Create dedicated service and cluster credentials. Configure inter-node communication with a secret, cluster credentials, and/or the internode HTTP and transport-protocol credentials supported by your release and topology.
- Verify that every node can authenticate to its peers using the replacement credentials. Test ordinary administration and a controlled rolling restart.
- Only after those checks, disable the default account for production use. Keep the recovery procedure and emergency credentials protected outside the database.
- Review configuration files, environment variables, orchestration secrets and connection strings to ensure the old account or password is not still embedded elsewhere.
Do not describe disabling default as a one-line hardening step. The safe sequence is replacement administration, replacement inter-node authentication, verification, then deactivation. If a legacy client still depends on the account, identify and migrate that client rather than leaving a broadly reachable shared credential in place.
Reduce network reachability before adding database permissions
Network exposure is a deployment-level control. Put ClickHouse behind the network boundaries appropriate to your environment, expose only interfaces and ports required by clients and cluster components, and keep administrative access separate from public application traffic. Apply restrictions at the cloud security-group, firewall, load-balancer and orchestration layers that actually govern the host.
- Inventory every client, node, backup process, monitoring agent and operator path that needs connectivity.
- Allow those paths explicitly and deny broad Internet reachability for native, HTTP, inter-node and administrative endpoints unless a documented requirement exists.
- Restrict management access to a bastion, private network or equivalent controlled path; do not place administrative interfaces on the same unrestricted route as application traffic.
- Remove temporary test rules after validation and review effective rules rather than relying only on intended infrastructure code.
- Confirm that DNS names, proxies and load balancers do not silently bypass the boundary you designed.
There is no single port list that is safe for every ClickHouse release and topology. Derive the allow-list from the services you actually enable and verify it against the target version’s server documentation.
Validate the path, not just the rule
Test from each approved source and from representative unapproved sources. Confirm that a client reaches only its intended endpoint, that a node cannot accidentally use a public address for peer traffic, and that a load balancer does not expose an administrative listener. Repeat the test after topology changes, failover, node replacement and DNS updates. Record the observed result, because an intended firewall rule is not proof of the effective route.
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For self-managed deployments, configure encrypted client connections and encrypted inter-node traffic for the actual release and topology. Plan certificate issuance, trust distribution, hostname validation, renewal, revocation and failure behavior before production traffic arrives. The server settings reference contains TLS/OpenSSL-related options, but setting names and supported combinations must be checked against the version you run.
Client-connection checks
- Require clients to use the TLS endpoint rather than an unencrypted listener.
- Distribute only the required certificate authorities to clients and validate the server name.
- Test expired, not-yet-valid, wrong-hostname and untrusted certificates so failures are visible rather than silently downgraded.
- Rotate certificates before expiry and monitor the remaining validity period.
- Confirm that connection pools, proxies and health checks also validate certificates instead of using an insecure fallback.
Inter-node checks
- Encrypt replication, distributed-query and other node-to-node paths that cross a network boundary.
- Authenticate peers with dedicated cluster credentials or secrets rather than a human password.
- Test a rolling restart and a node replacement with encryption enabled; a setting that works only on an existing process is not a deployment control.
- Verify that every node trusts the intended certificate authority and rejects an unknown peer.
The ClickHouse Information Security Addendum says ClickHouse Cloud encrypts customer data in transit using at least SSL with SHA-256 or TLS 1.2 with strong ciphers, and encrypts data at rest using at least AES-256 with strong ciphers. It also states that hosting-provider-managed keys are rotated at least annually. These are ClickHouse Cloud commitments, not proof that a self-managed installation is encrypted by default.
Protect secrets throughout their lifecycle
Credentials for users, clusters, backups, monitoring and orchestration are security assets in their own right. Keep them out of source control, container layers, shell history, tickets and unredacted logs. Prefer short-lived or centrally rotated credentials where your deployment supports them, and restrict which processes can read each secret.
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- Map every secret to an owner, purpose, storage location, rotation method and emergency-revocation procedure.
- Use different credentials for human administration, applications, inter-node communication and backup systems.
- After rotation, search connection pools, scheduled jobs, sidecars and deployment manifests for stale values.
- Redact passwords, tokens, certificate private keys and query parameters from security and application logs.
- Test recovery with a rotated secret; a credential that cannot be restored safely encourages unsafe long-lived copies.
- Check backups, snapshots and infrastructure state files for copied credentials, because deleting a value from the live configuration does not remove historical copies.
Make patching and vulnerability response recurring work
Subscribe to ClickHouse release and security notices, evaluate fixes in a staging environment that resembles production, and deploy them according to your risk and compliance requirements. No universal self-managed patch interval is established here; criticality, exposure, compatibility and the availability of a tested rollback determine the schedule.
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- Review vulnerability notices and determine whether the affected component is present and reachable in your deployment.
- Test the candidate update with representative distributed queries, replication, authentication, row policies and backup/restore operations.
- Roll out in a controlled order, monitor errors and latency, and retain a rollback or restore path.
- Record the decision, deployment time, exceptions and compensating controls for audit and incident response.
The Information Security Addendum says ClickHouse performs network and application penetration testing at least annually and uses commercially reasonable efforts to remediate or mitigate critical vulnerabilities within 14 days from a compatible vendor patch becoming publicly available, or from confirmation of an internal vulnerability. That period applies to ClickHouse’s release of a fix and excludes the customer’s adoption time. It is a vendor commitment for the stated services, not an SLA for self-managed installations.
For self-managed and BYOC environments, include the image registry, Keeper, operators, Helm charts, host kernel and cloud services in vulnerability review. A fixed ClickHouse binary does not remediate an outdated base image or an exposed management plane. Record accepted exceptions with an owner, expiration date and compensating control rather than allowing temporary risk to become permanent.
Monitor security signals and rehearse incident response
Retain and monitor authentication failures, privilege changes, account creation and deletion, configuration changes, TLS failures, unusual query patterns, access to sensitive tables and administrative actions. Send relevant events to a protected, access-controlled logging system with enough time synchronization and retention to reconstruct an incident.
Minimum response playbook
- Identify the suspected account, node, service or network path and preserve relevant logs before changing evidence.
- Revoke or rotate affected credentials, disable compromised accounts and narrow network access.
- Determine whether data was read, changed, copied or deleted; include distributed nodes and remote-backed tables in the scope.
- Restore service from a verified backup or clean node when integrity is uncertain, and validate permissions before reopening traffic.
- Document notification, containment, eradication and recovery decisions, then update controls from the lessons learned.
Cloud customers should also understand which monitoring and response activities the provider performs and what evidence remains their responsibility. Self-managed and BYOC operators must ensure their own teams can detect and respond across both ClickHouse and the surrounding infrastructure.
Exercise the uncomfortable cases
Rehearse a leaked service password, a compromised administrator, a certificate that expires during a rolling restart, a node that cannot authenticate to its peers and a backup restored into a clean environment. Include the people who own network controls, identity systems, cloud accounts and application clients. Exercises often reveal that a technically correct control cannot be used quickly under pressure.
Consider hardened container images, without treating them as a complete fix
A ClickHouse engineering article dated July 10, 2026 reports Docker Hardened Images for ClickHouse Server, Keeper, the Kubernetes Operator and Helm chart, and the metrics exporter. The article describes a minimal base and a non-root default for the hardened server image.
In the article’s report of a Docker Scout comparison, the standard image had “8 medium and 11 low severity findings across 111 packages,” while the hardened image had “0 medium and 14 low.” The remaining findings were in core libraries with no fix available at that time. These are ClickHouse’s reported scan results, not an independent assessment, and image tags and findings can change.
- Pin image digests or otherwise control exactly which image is deployed.
- Scan the image in your own registry and review operating-system, language-runtime and application dependencies.
- Run as non-root where the workload and storage permissions permit, and remove unnecessary capabilities.
- Keep the host, Kubernetes nodes, operator and Helm chart patched; a hardened application image does not secure an outdated runtime.
- Retest upgrades because a new image can add, remove or reclassify vulnerabilities.
Use this pre-production checklist
- Write the responsibility map for self-managed, Cloud or BYOC deployment.
- Inventory nodes, listeners, clients, service accounts, data stores and administrative paths.
- Create named human and service identities, roles and documented grants.
- Test row policies against reads, writes, distributed queries and underlying tables before treating them as isolation.
- Create replacement administrative and inter-node credentials before disabling
default. - Apply network allow-lists and separate management traffic from application traffic.
- Enable and verify TLS for client and inter-node paths, including certificate renewal and hostname validation.
- Move secrets into controlled storage, rotate them and remove stale copies.
- Configure security-relevant logging, alerting, retention and time synchronization.
- Stage patches and container updates, then record rollout and rollback procedures.
- Exercise credential compromise, node replacement, backup restoration and incident notification scenarios.
- Capture evidence of each test, its result, the owner and the date of the next review.
Common mistakes to avoid
- Disabling
defaultfirst: this can break inter-node communication or remove your only working administrator. Replace and test credentials first. - Assuming a row policy is tenant isolation: write and partition-copy capabilities, distributed queries and underlying tables can bypass the intended boundary.
- Assuming managed-service encryption applies everywhere: Cloud commitments do not configure TLS on self-managed servers.
- Opening broad firewall access because a client needs one endpoint: authorize the actual source, destination and protocol rather than exposing the host generally.
- Relying on an image scan as the whole program: image findings, host vulnerabilities, credentials, network rules and ClickHouse configuration remain separate controls.
- Leaving patches to an annual project: use risk-based evaluation and prompt, tested deployment when fixes address exposed or critical components.
- Assuming a provider owns every control: managed infrastructure does not transfer responsibility for your data, identities, grants or customer-side network paths.
Frequently asked questions
How do I secure a ClickHouse server before production?
Assign control ownership, restrict network reachability, create named users and roles, replace the default account safely, enable and verify TLS, protect secrets, configure security logging, stage patches and test backup recovery. Validate each control on the exact release and topology you will operate.
Should I disable the default user?
Usually, production operators should disable it after creating a tested administrative account and replacement inter-node credentials. Because fresh installations use default for inter-node communication, disabling it first can break the cluster or eliminate your only working administrator.
Are row policies enough to isolate tenants?
No. They are documented as meaningful primarily with read-only access, and write or partition-copy capabilities can defeat the restriction. Distributed and remote-backed tables require policies on the underlying tables and complete query-path testing. Use stronger separation when the access path cannot be proven safe.
Does ClickHouse Cloud secure everything for me?
No. The ClickHouse Information Security Addendum describes managed-service controls, but states that customers are responsible for managing their data and access. You still administer identities, grants, application behavior and customer-side evidence. BYOC also leaves additional cloud-infrastructure security and management duties with you.
How should I configure TLS?
Use the server settings and client guidance for your exact ClickHouse release and deployment topology. Require certificate validation, plan trust distribution and renewal, encrypt appropriate inter-node paths, and test invalid certificates, rolling restarts and node replacement. Do not copy a setting name from another release without verification.
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What does the Cloud encryption statement prove?
The addendum states that ClickHouse Cloud encrypts data in transit using at least SSL with SHA-256 or TLS 1.2 with strong ciphers, and data at rest using at least AES-256 with strong ciphers; provider-managed keys are rotated at least annually. Those are scoped service commitments, not evidence of self-managed defaults.
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There is no single interval established for every deployment. Set a risk-based process that considers exposure, severity, compatibility and rollback readiness. The addendum’s 14-day critical-vulnerability target describes ClickHouse’s release of fixes for specified services and excludes customer adoption time; it is not a self-managed SLA.
Do hardened images eliminate container risk?
No. ClickHouse reported Docker Scout results of 8 medium and 11 low findings across 111 packages for a standard image versus 0 medium and 14 low for a hardened image. The remaining findings were in core libraries without a fix at that time. Scan your selected digest and secure the host, runtime, orchestrator and credentials as separate controls.
Frequently Asked Questions
Who owns security in a BYOC deployment?
The customer retains additional cloud-account and infrastructure security and management duties, while ClickHouse operates the service software. Define the boundary explicitly for identities, networks, storage, patches, logs and incident response.
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What should I monitor in ClickHouse?
Monitor authentication failures, account and role changes, privilege changes, configuration changes, TLS failures, unusual query behavior, sensitive-table access and administrative actions. Protect the resulting logs and keep enough retention to reconstruct an incident.
Can I expose ClickHouse directly to the Internet?
Only when a documented requirement exists and the surrounding controls are designed for it. Prefer explicit source allow-lists, separated management access and encrypted endpoints; verify effective firewall, proxy and load-balancer paths rather than relying on intended rules.
What must be tested after rotating a secret?
Test every connection pool, scheduled job, sidecar, backup process and deployment manifest that uses the credential. Confirm that old values no longer work and that the emergency recovery procedure can restore service without creating an uncontrolled copy.
How do I prove a security control is operating?
Keep the owner, configuration or grant, test method, observed result, date and next review. Useful evidence includes access reviews, network-path tests, certificate checks, patch records, image-scan results, restore tests and incident exercises.
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ClickHouse security is a chain of owned controls, not a single setting. Choose the deployment model consciously, document the boundary, enforce least privilege, replace default only after securing cluster authentication, restrict reachability, verify TLS, rotate secrets, patch every layer and rehearse response. Managed services can reduce platform work, but your data and access decisions remain yours.
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