Prometheus & Alert Manager keeps crashing after updating the EKS version to 1.16 - kubernetes

Question

prometheus-prometheus-kube-prometheus-prometheus-0 0/2 Terminating 0 4s
alertmanager-prometheus-kube-prometheus-alertmanager-0 0/2 Terminating 0 10s
After updating EKS cluster to 1.16 from 1.15 everything works fine except these two pods, they keep on terminating and unable to initialise. Hence, prometheus monitoring does not work. I am getting below errors while describing the pods.
Error: failed to start container "prometheus": Error response from daemon: OCI runtime create failed: container_linux.go:362: creating new parent process caused: container_linux.go:1941: running lstat on namespace path "/proc/29271/ns/ipc" caused: lstat /proc/29271/ns/ipc: no such file or directory: unknown
Error: failed to start container "config-reloader": Error response from daemon: cannot join network of a non running container: 7e139521980afd13dad0162d6859352b0b2c855773d6d4062ee3e2f7f822a0b3
Error: cannot find volume "config" to mount into container "config-reloader"
Error: cannot find volume "config" to mount into container "prometheus"
here is my yaml file for the deployment:
apiVersion: v1
kind: Pod
metadata:
annotations:
kubernetes.io/psp: eks.privileged
creationTimestamp: "2021-04-30T16:39:14Z"
deletionGracePeriodSeconds: 600
deletionTimestamp: "2021-04-30T16:49:14Z"
generateName: prometheus-prometheus-kube-prometheus-prometheus-
labels:
app: prometheus
app.kubernetes.io/instance: prometheus-kube-prometheus-prometheus
app.kubernetes.io/managed-by: prometheus-operator
app.kubernetes.io/name: prometheus
app.kubernetes.io/version: 2.26.0
controller-revision-hash: prometheus-prometheus-kube-prometheus-prometheus-56d9fcf57
operator.prometheus.io/name: prometheus-kube-prometheus-prometheus
operator.prometheus.io/shard: "0"
prometheus: prometheus-kube-prometheus-prometheus
statefulset.kubernetes.io/pod-name: prometheus-prometheus-kube-prometheus-prometheus-0
name: prometheus-prometheus-kube-prometheus-prometheus-0
namespace: mo
ownerReferences:
- apiVersion: apps/v1
blockOwnerDeletion: true
controller: true
kind: StatefulSet
name: prometheus-prometheus-kube-prometheus-prometheus
uid: 326a09f2-319c-449d-904a-1dd0019c6d80
resourceVersion: "9337443"
selfLink: /api/v1/namespaces/monitoring/pods/prometheus-prometheus-kube-prometheus-prometheus-0
uid: e2be062f-749d-488e-a6cc-42ef1396851b
spec:
containers:
- args:
- --web.console.templates=/etc/prometheus/consoles
- --web.console.libraries=/etc/prometheus/console_libraries
- --config.file=/etc/prometheus/config_out/prometheus.env.yaml
- --storage.tsdb.path=/prometheus
- --storage.tsdb.retention.time=10d
- --web.enable-lifecycle
- --storage.tsdb.no-lockfile
- --web.external-url=http://prometheus-kube-prometheus-prometheus.monitoring:9090
- --web.route-prefix=/
image: quay.io/prometheus/prometheus:v2.26.0
imagePullPolicy: IfNotPresent
name: prometheus
ports:
- containerPort: 9090
name: web
protocol: TCP
readinessProbe:
failureThreshold: 120
httpGet:
path: /-/ready
port: web
scheme: HTTP
periodSeconds: 5
successThreshold: 1
timeoutSeconds: 3
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: FallbackToLogsOnError
volumeMounts:
- mountPath: /etc/prometheus/config_out
name: config-out
readOnly: true
- mountPath: /etc/prometheus/certs
name: tls-assets
readOnly: true
- mountPath: /prometheus
name: prometheus-prometheus-kube-prometheus-prometheus-db
- mountPath: /etc/prometheus/rules/prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
name: prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: prometheus-kube-prometheus-prometheus-token-mh66q
readOnly: true
- args:
- --listen-address=:8080
- --reload-url=http://localhost:9090/-/reload
- --config-file=/etc/prometheus/config/prometheus.yaml.gz
- --config-envsubst-file=/etc/prometheus/config_out/prometheus.env.yaml
- --watched-dir=/etc/prometheus/rules/prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
command:
- /bin/prometheus-config-reloader
env:
- name: POD_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.name
- name: SHARD
value: "0"
image: quay.io/prometheus-operator/prometheus-config-reloader:v0.47.0
imagePullPolicy: IfNotPresent
name: config-reloader
ports:
- containerPort: 8080
name: reloader-web
protocol: TCP
resources:
limits:
cpu: 100m
memory: 50Mi
requests:
cpu: 100m
memory: 50Mi
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: FallbackToLogsOnError
volumeMounts:
- mountPath: /etc/prometheus/config
name: config
- mountPath: /etc/prometheus/config_out
name: config-out
- mountPath: /etc/prometheus/rules/prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
name: prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: prometheus-kube-prometheus-prometheus-token-mh66q
readOnly: true
dnsPolicy: ClusterFirst
enableServiceLinks: true
hostname: prometheus-prometheus-kube-prometheus-prometheus-0
nodeName: ip-10-1-49-45.ec2.internal
priority: 0
restartPolicy: Always
schedulerName: default-scheduler
securityContext:
fsGroup: 2000
runAsGroup: 2000
runAsNonRoot: true
runAsUser: 1000
serviceAccount: prometheus-kube-prometheus-prometheus
serviceAccountName: prometheus-kube-prometheus-prometheus
subdomain: prometheus-operated
terminationGracePeriodSeconds: 600
tolerations:
- effect: NoExecute
key: node.kubernetes.io/not-ready
operator: Exists
tolerationSeconds: 300
- effect: NoExecute
key: node.kubernetes.io/unreachable
operator: Exists
tolerationSeconds: 300
volumes:
- name: config
secret:
defaultMode: 420
secretName: prometheus-prometheus-kube-prometheus-prometheus
- name: tls-assets
secret:
defaultMode: 420
secretName: prometheus-prometheus-kube-prometheus-prometheus-tls-assets
- emptyDir: {}
name: config-out
- configMap:
defaultMode: 420
name: prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
name: prometheus-prometheus-kube-prometheus-prometheus-rulefiles-0
- emptyDir: {}
name: prometheus-prometheus-kube-prometheus-prometheus-db
- name: prometheus-kube-prometheus-prometheus-token-mh66q
secret:
defaultMode: 420
secretName: prometheus-kube-prometheus-prometheus-token-mh66q
status:
conditions:
- lastProbeTime: null
lastTransitionTime: "2021-04-30T16:39:14Z"
status: "True"
type: PodScheduled
phase: Pending
qosClass: Burstable

Answer 1

If someone needs to know the answer, in my case(the above situation) there were 2 Prometheus operators running in different different namespace, 1 in default & another monitoring namespace. so I removed the one from the default namespace and it resolved my pods crashing issue.