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CLOUDP-348828 - fixes Operator crash when securityContext.readOnlyRootFilesystem=true #488

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CLOUDP-348828 - fixes Operator crash when securityContext.readOnlyRootFilesystem=true #488

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d6dc4c8
Fixes Operator crash when `securityContext.readOnlyRootFilesystem=true`
MaciejKaras Oct 1, 2025
649cf97
Add changelog
MaciejKaras Oct 1, 2025
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6 changes: 6 additions & 0 deletions changelog/20251001_fix_operator_crash_when_readonly_root_filesystem.md
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@@ -0,0 +1,6 @@
---
kind: fix
date: 2025-10-01
---

* **MongoDB Kubernetes Operator**: Operator crashed when `securityContext.readOnlyRootFilesystem=true` was set, because it was trying to create `/tmp/k8s-webhook-server` directory that was unmounted.
6 changes: 6 additions & 0 deletions config/manager/manager.yaml
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Expand Up @@ -33,6 +33,9 @@ spec:
- -watch-resource=clustermongodbroles
command:
- /usr/local/bin/mongodb-kubernetes-operator
volumeMounts:
- mountPath: /tmp/k8s-webhook-server
name: webhook-server-dir
resources:
limits:
cpu: 1100m
Expand Down Expand Up @@ -313,3 +316,6 @@ spec:
value: "mongodb-search"
- name: MDB_SEARCH_VERSION
value: "0.53.1"
volumes:
- name: webhook-server-dir
emptyDir: {}
13 changes: 10 additions & 3 deletions helm_chart/templates/operator.yaml
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Expand Up @@ -36,6 +36,8 @@ spec:
securityContext:
runAsNonRoot: true
runAsUser: 2000
runAsGroup: 2000
fsGroup: 2000
seccompProfile:
type: RuntimeDefault
{{- end }}
Expand Down Expand Up @@ -64,8 +66,10 @@ spec:
command:
- /usr/local/bin/mongodb-kubernetes-operator
{{- end }}
{{- if .Values.multiCluster.clusters }}
volumeMounts:
- mountPath: /tmp/k8s-webhook-server
name: webhook-server-dir
{{- if .Values.multiCluster.clusters }}
- mountPath: /etc/config/kubeconfig
name: kube-config-volume
{{- end }}
Expand All @@ -79,6 +83,7 @@ spec:
{{- if not .Values.managedSecurityContext }}
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
capabilities:
drop:
- ALL
Expand Down Expand Up @@ -290,13 +295,15 @@ spec:
value: '{{ (split "=" .)._1 }}'
{{- end }}
{{- end }}
{{- if .Values.multiCluster.clusters }}
volumes:
- name: webhook-server-dir
emptyDir: {}
{{- if .Values.multiCluster.clusters }}
- name: kube-config-volume
secret:
defaultMode: 420
secretName: {{ .Values.multiCluster.kubeConfigSecretName }}
{{- end }}
{{- end }}

{{- with .Values.operator }}
{{- with .nodeSelector }}
Expand Down
7 changes: 7 additions & 0 deletions public/mongodb-kubernetes-multi-cluster.yaml
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Expand Up @@ -329,6 +329,8 @@ spec:
securityContext:
runAsNonRoot: true
runAsUser: 2000
runAsGroup: 2000
fsGroup: 2000
seccompProfile:
type: RuntimeDefault
containers:
Expand All @@ -346,6 +348,8 @@ spec:
command:
- /usr/local/bin/mongodb-kubernetes-operator
volumeMounts:
- mountPath: /tmp/k8s-webhook-server
name: webhook-server-dir
- mountPath: /etc/config/kubeconfig
name: kube-config-volume
resources:
Expand All @@ -357,6 +361,7 @@ spec:
memory: 200Mi
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
capabilities:
drop:
- ALL
Expand Down Expand Up @@ -445,6 +450,8 @@ spec:
- name: MDB_SEARCH_VERSION
value: "0.53.1"
volumes:
- name: webhook-server-dir
emptyDir: {}
- name: kube-config-volume
secret:
defaultMode: 420
Expand Down
6 changes: 6 additions & 0 deletions public/mongodb-kubernetes-openshift.yaml
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Expand Up @@ -339,6 +339,9 @@ spec:
- -watch-resource=clustermongodbroles
command:
- /usr/local/bin/mongodb-kubernetes-operator
volumeMounts:
- mountPath: /tmp/k8s-webhook-server
name: webhook-server-dir
resources:
limits:
cpu: 1100m
Expand Down Expand Up @@ -617,3 +620,6 @@ spec:
value: "mongodb-search"
- name: MDB_SEARCH_VERSION
value: "0.53.1"
volumes:
- name: webhook-server-dir
emptyDir: {}
9 changes: 9 additions & 0 deletions public/mongodb-kubernetes.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -329,6 +329,8 @@ spec:
securityContext:
runAsNonRoot: true
runAsUser: 2000
runAsGroup: 2000
fsGroup: 2000
seccompProfile:
type: RuntimeDefault
containers:
Expand All @@ -344,6 +346,9 @@ spec:
- -watch-resource=clustermongodbroles
command:
- /usr/local/bin/mongodb-kubernetes-operator
volumeMounts:
- mountPath: /tmp/k8s-webhook-server
name: webhook-server-dir
resources:
limits:
cpu: 1100m
Expand All @@ -353,6 +358,7 @@ spec:
memory: 200Mi
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
capabilities:
drop:
- ALL
Expand Down Expand Up @@ -440,3 +446,6 @@ spec:
value: "mongodb-search"
- name: MDB_SEARCH_VERSION
value: "0.53.1"
volumes:
- name: webhook-server-dir
emptyDir: {}