4c6a06cf7e
Prometheus-adapter is a component of the monitoring stack that in most cases require to be highly available. For instance, we most likely always want the autoscaling pipeline to be available and we also want to avoid having no available backends serving the metrics API apiservices has it would result in both the AggregatedAPIDown alert firing and the kubectl top command not working anymore. In order to make the adapter highly-avaible, we need to increase its replica count to 2 and come up with a rolling update strategy and a pod anti-affinity rule based on the kubernetes hostname to prevent the adapters to be scheduled on the same node. The default rolling update strategy for deployments isn't enough as the default maxUnavaible value is 25% and is rounded down to 0. This means that during rolling-updates scheduling will fail if there isn't more nodes than the number of replicas. As for the maxSurge, the default should be fine as it is rounded up to 1, but for clarity it might be better to just set it to 1. For the pod anti-affinity constraints, it would be best if it was hard, but having it soft should be good enough and fit most use-cases. Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>
63 lines
1.8 KiB
YAML
63 lines
1.8 KiB
YAML
apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app.kubernetes.io/component: metrics-adapter
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app.kubernetes.io/name: prometheus-adapter
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app.kubernetes.io/part-of: kube-prometheus
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app.kubernetes.io/version: 0.8.4
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name: prometheus-adapter
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namespace: monitoring
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spec:
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replicas: 2
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selector:
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matchLabels:
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app.kubernetes.io/component: metrics-adapter
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app.kubernetes.io/name: prometheus-adapter
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app.kubernetes.io/part-of: kube-prometheus
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strategy:
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rollingUpdate:
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maxSurge: 1
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maxUnavailable: 1
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template:
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metadata:
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labels:
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app.kubernetes.io/component: metrics-adapter
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app.kubernetes.io/name: prometheus-adapter
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app.kubernetes.io/part-of: kube-prometheus
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app.kubernetes.io/version: 0.8.4
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spec:
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containers:
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- args:
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- --cert-dir=/var/run/serving-cert
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- --config=/etc/adapter/config.yaml
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- --logtostderr=true
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- --metrics-relist-interval=1m
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- --prometheus-url=http://prometheus-k8s.monitoring.svc.cluster.local:9090/
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- --secure-port=6443
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image: directxman12/k8s-prometheus-adapter:v0.8.4
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name: prometheus-adapter
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ports:
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- containerPort: 6443
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volumeMounts:
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- mountPath: /tmp
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name: tmpfs
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readOnly: false
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- mountPath: /var/run/serving-cert
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name: volume-serving-cert
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readOnly: false
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- mountPath: /etc/adapter
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name: config
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readOnly: false
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nodeSelector:
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kubernetes.io/os: linux
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serviceAccountName: prometheus-adapter
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volumes:
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- emptyDir: {}
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name: tmpfs
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- emptyDir: {}
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name: volume-serving-cert
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- configMap:
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name: adapter-config
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name: config
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