149 lines
4.0 KiB
YAML
149 lines
4.0 KiB
YAML
# Single-node ClickHouse for the otel-debug-receiver, applied as one file:
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# kubectl apply -f k8s/clickhouse.yaml
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#
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# A single instance (per request): one StatefulSet replica. Data lives on
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# serber's local disk at /srv/monitoring-db (hostPath), so the pod is pinned to
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# that node. It used to be an nfs-client PVC on a spinning-disk NAS, where
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# synchronous writes cost ~120 ms and every query paid that latency; see
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# k8s/migrate/clickhouse-nfs-to-local.yaml for the one-off data move.
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# Resources sized for a small cluster; adjust before production use.
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apiVersion: v1
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kind: Namespace
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metadata:
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name: otel-debug
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---
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apiVersion: v1
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kind: Secret
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metadata:
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name: clickhouse-auth
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namespace: monitoring
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type: Opaque
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stringData:
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# Change these before applying. ClickHouse will honor the values from
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# the users.d override mounted below, so no post-install SQL is needed.
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username: otel
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password: CHANGE_ME
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: clickhouse-config
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namespace: monitoring
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data:
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users.d-otel.xml: |
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<clickhouse>
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<users>
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<otel>
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<password from_env="CLICKHOUSE_PASSWORD"/>
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<networks><ip>::/0</ip></networks>
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<grants>
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<grant><query>GRANT ALL ON otel.*</query></grant>
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</grants>
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</otel>
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</users>
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</clickhouse>
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---
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: clickhouse
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namespace: monitoring
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spec:
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serviceName: clickhouse
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replicas: 1
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selector:
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matchLabels:
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app: clickhouse
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template:
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metadata:
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labels:
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app: clickhouse
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spec:
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nodeSelector:
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kubernetes.io/hostname: serber
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securityContext:
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fsGroup: 101
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initContainers:
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# hostPath directories are created root-owned and fsGroup does not apply
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# to them; ClickHouse runs as uid/gid 101.
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- name: fix-data-perms
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image: busybox:1.36
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command: ["sh", "-c", "chown -R 101:101 /var/lib/clickhouse"]
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securityContext:
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runAsUser: 0
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volumeMounts:
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- name: data
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mountPath: /var/lib/clickhouse
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containers:
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- name: clickhouse
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image: clickhouse/clickhouse-server:24.8
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ports:
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- containerPort: 9000
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name: native
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- containerPort: 8123
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name: http
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env:
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- name: CLICKHOUSE_PASSWORD
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valueFrom:
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secretKeyRef:
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name: clickhouse-auth
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key: password
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volumeMounts:
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- name: data
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mountPath: /var/lib/clickhouse
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# Mount the user override as a single file: ConfigMap volumes are
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# read-only, and the entrypoint needs to write its own
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# default-user.xml into the users.d directory on first start.
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- name: user-config
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mountPath: /etc/clickhouse-server/users.d/otel.xml
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subPath: users.d-otel.xml
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readinessProbe:
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httpGet:
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path: /ping
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port: http
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initialDelaySeconds: 10
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periodSeconds: 10
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livenessProbe:
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httpGet:
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path: /ping
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port: http
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initialDelaySeconds: 30
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periodSeconds: 30
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resources:
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requests:
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memory: "512Mi"
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cpu: "250m"
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limits:
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memory: "2Gi"
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cpu: "1"
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volumes:
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- name: data
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hostPath:
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path: /srv/monitoring-db
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type: DirectoryOrCreate
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- name: user-config
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configMap:
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name: clickhouse-config
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items:
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- key: users.d-otel.xml
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path: users.d-otel.xml
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: clickhouse
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namespace: monitoring
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spec:
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selector:
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app: clickhouse
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ports:
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- name: native
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port: 9000
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targetPort: 9000
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- name: http
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port: 8123
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targetPort: 8123
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# LoadBalancer for local-LAN development access only (training exports,
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# spike-alerts). The receiver itself stays behind its own Service.
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type: LoadBalancer
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