> ## Documentation Index
> Fetch the complete documentation index at: https://cloudanix.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# OCI OKE Should Minimize Containers Sharing the Host IPC Namespace

### More Info:

Containers running with hostIPC=true share the hosts inter-process communication namespace and can read or send signals to other processes on the node. Block this in admission policy except for explicit, audited use cases.

### Risk Level

High

### Address

Compliance, Security

### Compliance Standards

* CIS OKE

### Triage and Remediation

<Tabs>
  <Tab title="Remediation">
    ### Remediation

    <AccordionGroup>
      <Accordion title="Using Console" defaultOpen="true">
        To remediate “Containers sharing the host IPC namespace” (`hostIPC: true`) in OCI OKE via the OCI Console, you essentially need to:

        1. **Find workloads using `hostIPC: true`.**
        2. **Update their Pod/Deployment specs to remove it.**
        3. **Optionally enforce a policy so it doesn’t reappear.**

        Below are step‑by‑step instructions using only the OCI Console (with Cloud Shell/kubectl from the console).

        ***

        ## 1. Open your OKE cluster from the OCI Console

        1. Sign in to the **OCI Console**.
        2. In the left-hand menu, go to:\
           **Developer Services → Containers & Artifacts → Kubernetes Clusters (OKE)**.
        3. Select the **Compartment** where your cluster lives.
        4. Click your **OKE cluster** name to open its details page.

        ***

        ## 2. Connect to the cluster using Cloud Shell from the Console

        1. On the cluster details page, find the **“Access Cluster”** or **“Cluster Access”** section.
        2. Click **“Cloud Shell”** (or the Cloud Shell icon in the top-right of the console).
           * This opens a terminal at the bottom of the console.
        3. In the cluster page, click **“Copy kubeconfig”** or follow the **“Access Cluster”** instructions:
           * Usually:
             ```bash theme={null}
             oci ce cluster create-kubeconfig \
               --cluster-id <cluster-ocid> \
               --file $HOME/.kube/config \
               --region <your-region> \
               --token-version 2.0.0 \
               --kube-endpoint PUBLIC_ENDPOINT
             ```
           * Then verify:
             ```bash theme={null}
             kubectl get nodes
             ```
           * If nodes are shown, you are connected.

        ***

        ## 3. Identify Pods/Workloads using `hostIPC: true`

        From **Cloud Shell** (still in the console):

        1. List all pods (all namespaces) including their full spec:
           ```bash theme={null}
           kubectl get pods -A -o yaml | grep -n "hostIPC"
           ```
        2. Or search at deployment level:
           ```bash theme={null}
           kubectl get deploy,statefulset,daemonset -A -o yaml | grep -n "hostIPC"
           ```

        Any occurrence like:

        ```yaml theme={null}
        spec:
          hostIPC: true
        ```

        indicates a misconfiguration.

        Note the **namespace** and **name** of the workload where you see `hostIPC: true`.

        ***

        ## 4. Edit each workload and remove `hostIPC: true`

        For each Deployment/StatefulSet/DaemonSet found:

        1. **Edit a Deployment (example):**
           ```bash theme={null}
           kubectl -n <namespace> edit deploy <deployment-name>
           ```
        2. In the editor that opens, look for:
           ```yaml theme={null}
           spec:
             template:
               spec:
                 hostIPC: true
           ```
        3. **Remove the line** `hostIPC: true` entirely (or change to `false`):
           ```yaml theme={null}
           spec:
             template:
               spec:
                 # hostIPC: true   <-- remove this line
           ```
        4. Save and exit (in `vi`: press `Esc`, then `:wq` and Enter).
        5. Kubernetes will roll out a new ReplicaSet without `hostIPC`.

        For a **StatefulSet** or **DaemonSet**, same pattern:

        ```bash theme={null}
        kubectl -n <namespace> edit statefulset <name>
        kubectl -n <namespace> edit daemonset <name>
        ```

        If you have **naked Pods** (not managed by a controller):

        ```bash theme={null}
        kubectl -n <namespace> edit pod <pod-name>
        ```

        Note: if the pod is part of a Deployment/Set, always edit the **controller**, not the individual pod.

        ***

        ## 5. Confirm `hostIPC` is no longer used

        Run again from Cloud Shell:

        ```bash theme={null}
        kubectl get pods -A -o yaml | grep -n "hostIPC"
        ```

        No output means no pod is currently configured with `hostIPC: true`.

        ***

        ## 6. (Optional) Add a policy to prevent `hostIPC` in the future

        OKE doesn’t manage this directly in the OCI Console UI; you use Kubernetes admission controls from the console via Cloud Shell.

        ### 6.1 Enable Pod Security Admission (recommended on new/newer clusters)

        If your cluster uses Kubernetes ≥1.25 and you can label namespaces:

        1. Choose a **Pod Security Standard level**, e.g., `restricted` (which disallows host namespaces like hostIPC).
        2. From Cloud Shell, label your namespaces, for example:

           ```bash theme={null}
           # Example: enforce restricted pod security in a namespace
           kubectl label namespace <namespace> \
             pod-security.kubernetes.io/enforce=restricted \
             --overwrite
           ```

        `restricted` policy will block pods using `hostIPC: true`.

        ### 6.2 Or use OPA Gatekeeper / Kyverno (if you already have it)

        If Gatekeeper is installed, create a ConstraintTemplate/Constraint that forbids `spec.hostIPC: true`. (Ask if you want the exact YAML.)

        ***

        ## 7. If the misconfiguration came from Helm or CI/CD

        If workloads are redeployed by Helm or pipelines, you must also:

        1. Update the **Helm chart values** or **YAML manifests** in your repo:
           * Remove or set `hostIPC: false` in the template:
             ```yaml theme={null}
             spec:
               hostIPC: false
             ```
        2. Re‑deploy from your pipeline/Helm to ensure it doesn’t reintroduce the setting.

        ***

        If you share a specific OKE version and example YAML with `hostIPC: true`, I can give an exact patch command or manifest to apply from Cloud Shell.
      </Accordion>

      <Accordion title="Using CLI">
        In OKE this is a **Kubernetes-level** setting (`hostIPC: true` in pod specs). Remediation is:

        1. **Make sure you can talk to the cluster via CLI**

           ```bash theme={null}
           # 1. Get cluster OCID
           oci ce cluster list --compartment-id <compartment_ocid>

           # 2. Generate kubeconfig for this cluster
           oci ce cluster create-kubeconfig \
             --cluster-id <cluster_ocid> \
             --file $HOME/.kube/oke-config \
             --region <region> \
             --token-version 2.0.0 \
             --kube-endpoint PUBLIC_ENDPOINT

           export KUBECONFIG=$HOME/.kube/oke-config

           # 3. Verify kubectl works
           kubectl get nodes
           ```

        2. **Find workloads using `hostIPC: true`**

           This flag can be set at pod or pod-template level.

           ```bash theme={null}
           # Check all namespaces
           kubectl get pods -A -o yaml | grep -n "hostIPC: true" -B3 -A5

           # Check Deployments
           kubectl get deploy -A -o yaml | grep -n "hostIPC: true" -B5 -A10

           # Check StatefulSets
           kubectl get statefulset -A -o yaml | grep -n "hostIPC: true" -B5 -A10

           # Check DaemonSets
           kubectl get daemonset -A -o yaml | grep -n "hostIPC: true" -B5 -A10
           ```

        3. **Edit the manifests to disable host IPC**

           For each object you found (Deployment, StatefulSet, DaemonSet, Pod):

           ```bash theme={null}
           # Example: edit a deployment in place
           kubectl -n <namespace> edit deployment <name>
           ```

           In the resulting YAML, locate the pod spec and **remove or set**:

           ```yaml theme={null}
           spec:
             template:
               spec:
                 hostIPC: false   # or remove the line entirely
           ```

           Save and exit. Kubernetes will roll out new pods without host IPC.

           Repeat for any StatefulSets, DaemonSets, or standalone Pods:

           ```bash theme={null}
           kubectl -n <namespace> edit statefulset <name>
           kubectl -n <namespace> edit daemonset <name>
           kubectl -n <namespace> edit pod <name>   # for static/one-off pods
           ```

        4. **Verify that host IPC is no longer used**

           ```bash theme={null}
           # Re-check for hostIPC: true
           kubectl get pods -A -o yaml | grep -n "hostIPC: true" -B3 -A5 || echo "No pods using hostIPC"

           # Optionally check pod descriptions
           kubectl -n <namespace> describe pod <pod_name> | grep -i hostIPC || echo "Not set"
           ```

        5. **(Recommended) Enforce policy so hostIPC cannot be re-enabled**

           Use Kubernetes Pod Security Admission (if 1.25+) or Gatekeeper.

           **Option A – Pod Security Admission (namespace labels)**

           For “restricted” policy level (blocks host IPC):

           ```bash theme={null}
           # Label namespaces to enforce restricted pod security
           kubectl label namespace <ns> \
             pod-security.kubernetes.io/enforce=restricted \
             pod-security.kubernetes.io/enforce-version=latest \
             --overwrite
           ```

           This will **reject** new pods with `hostIPC: true` in those namespaces.

           **Option B – Gatekeeper constraint (if you have Gatekeeper installed)**

           Example `K8sPSPHostIPC` constraint:

           ```yaml theme={null}
           apiVersion: constraints.gatekeeper.sh/v1beta1
           kind: K8sPSPHostIPC
           metadata:
             name: disallow-hostipc
           spec:
             match:
               kinds:
                 - apiGroups: [""]
                   kinds: ["Pod"]
               namespaces:
                 - "<your-namespace>"   # or omit to apply cluster-wide
           ```

           Apply:

           ```bash theme={null}
           kubectl apply -f disallow-hostipc.yaml
           ```

        Summary of OCI CLI use:

        1. Use `oci ce cluster create-kubeconfig` to set kubeconfig.
        2. Use `kubectl` to:
           * discover pods with `hostIPC: true`,
           * edit workloads to remove `hostIPC`,
           * optionally enforce namespace-level Pod Security labels or Gatekeeper constraints.
      </Accordion>

      <Accordion title="Using Python">
        To minimize containers sharing the host IPC namespace in OKE, you need to:

        1. **Detect** all workloads using `hostIPC: true`.
        2. **Patch** them to remove or disable `hostIPC`.
        3. **Optionally enforce** a policy so it can’t be reintroduced.

        Below is how to do this in OKE using Python and the Kubernetes Python client.

        ***

        ## 1. Prerequisites

        ```bash theme={null}
        pip install kubernetes
        ```

        Make sure your local kubeconfig is set to point to your OKE cluster:

        ```bash theme={null}
        kubectl config use-context <your-oke-context>
        ```

        ***

        ## 2. Python: Find all workloads with `hostIPC: true`

        This scans Deployments, StatefulSets, DaemonSets, ReplicaSets, and Pods.

        ```python theme={null}
        from kubernetes import client, config

        def has_hostipc(pod_spec):
            return getattr(pod_spec, "host_ipc", False) is True

        def main():
            # Load kubeconfig
            config.load_kube_config()  # or config.load_incluster_config() if running inside a pod

            apps_v1 = client.AppsV1Api()
            core_v1 = client.CoreV1Api()

            # Namespaces to scan (None => all)
            namespaces = [ns.metadata.name for ns in core_v1.list_namespace().items]

            for ns in namespaces:
                print(f"\nNamespace: {ns}")

                # Deployments
                for d in apps_v1.list_namespaced_deployment(ns).items:
                    if has_hostipc(d.spec.template.spec):
                        print(f"Deployment with hostIPC: {d.metadata.name}")

                # StatefulSets
                for ss in apps_v1.list_namespaced_stateful_set(ns).items:
                    if has_hostipc(ss.spec.template.spec):
                        print(f"StatefulSet with hostIPC: {ss.metadata.name}")

                # DaemonSets
                for ds in apps_v1.list_namespaced_daemon_set(ns).items:
                    if has_hostipc(ds.spec.template.spec):
                        print(f"DaemonSet with hostIPC: {ds.metadata.name}")

                # ReplicaSets (if needed)
                for rs in apps_v1.list_namespaced_replica_set(ns).items:
                    if has_hostipc(rs.spec.template.spec):
                        print(f"ReplicaSet with hostIPC: {rs.metadata.name}")

                # Standalone Pods
                for p in core_v1.list_namespaced_pod(ns).items:
                    if has_hostipc(p.spec):
                        print(f"Pod with hostIPC: {p.metadata.name}")

        if __name__ == "__main__":
            main()
        ```

        ***

        ## 3. Python: Patch workloads to disable `hostIPC`

        This sets `hostIPC: false` on matching workloads.

        ```python theme={null}
        from kubernetes import client, config

        def patch_hostipc_false():
            config.load_kube_config()
            apps_v1 = client.AppsV1Api()
            core_v1 = client.CoreV1Api()

            namespaces = [ns.metadata.name for ns in core_v1.list_namespace().items]

            def patch_deployment(ns, name):
                body = {"spec": {"template": {"spec": {"hostIPC": False}}}}
                apps_v1.patch_namespaced_deployment(name=name, namespace=ns, body=body)
                print(f"Patched Deployment {ns}/{name}")

            def patch_statefulset(ns, name):
                body = {"spec": {"template": {"spec": {"hostIPC": False}}}}
                apps_v1.patch_namespaced_stateful_set(name=name, namespace=ns, body=body)
                print(f"Patched StatefulSet {ns}/{name}")

            def patch_daemonset(ns, name):
                body = {"spec": {"template": {"spec": {"hostIPC": False}}}}
                apps_v1.patch_namespaced_daemon_set(name=name, namespace=ns, body=body)
                print(f"Patched DaemonSet {ns}/{name}")

            def patch_pod(ns, name):
                body = {"spec": {"hostIPC": False}}
                core_v1.patch_namespaced_pod(name=name, namespace=ns, body=body)
                print(f"Patched Pod {ns}/{name}")

            def has_hostipc(pod_spec):
                return getattr(pod_spec, "host_ipc", False) is True

            for ns in namespaces:
                # Deployments
                for d in apps_v1.list_namespaced_deployment(ns).items:
                    if has_hostipc(d.spec.template.spec):
                        patch_deployment(ns, d.metadata.name)

                # StatefulSets
                for ss in apps_v1.list_namespaced_stateful_set(ns).items:
                    if has_hostipc(ss.spec.template.spec):
                        patch_statefulset(ns, ss.metadata.name)

                # DaemonSets
                for ds in apps_v1.list_namespaced_daemon_set(ns).items:
                    if has_hostipc(ds.spec.template.spec):
                        patch_daemonset(ns, ds.metadata.name)

                # Standalone Pods (note: they may be recreated by a controller)
                for p in core_v1.list_namespaced_pod(ns).items:
                    # Skip pods managed by controllers; fix the controller instead
                    if p.metadata.owner_references:
                        continue
                    if has_hostipc(p.spec):
                        patch_pod(ns, p.metadata.name)

        if __name__ == "__main__":
            patch_hostipc_false()
        ```

        Run this, then verify:

        ```bash theme={null}
        kubectl get deploy,statefulset,daemonset,pod -A -o yaml | grep -n hostIPC
        ```

        ***

        ## 4. Optional: Enforce policy (prevent future `hostIPC`)

        In OKE you can use:

        * **OPA Gatekeeper** or **Kyverno** to deny workloads with `hostIPC: true`, e.g. a Gatekeeper ConstraintTemplate that rejects `.spec.template.spec.hostIPC == true`.

        If you want, I can provide a ready-made Gatekeeper or Kyverno policy to enforce this in OKE.
      </Accordion>

      <Accordion title="Using Terraform">
        This setting cannot be controlled on the `oci_containerengine_cluster` resource itself. OKE does not expose a cluster‑level Terraform argument to block `hostIPC: true`; you must enforce this via Kubernetes admission controls (e.g., Pod Security Admission / Pod Security Policies for older versions, or OPA Gatekeeper constraints) applied inside the cluster using `kubectl` or a Kubernetes‑oriented Terraform provider, or via the OKE Console’s admission policy / security profile configuration.

        `terraform plan` for the `oci_containerengine_cluster` resource alone will show no changes related to `hostIPC` because that knob is not available on this resource.
      </Accordion>
    </AccordionGroup>
  </Tab>
</Tabs>