StatefulSet FailedCreate ElasticSearch

Question

当试图在PKS实例上为Kubernetes安装ElasticSearch时，我遇到了一个问题，在运行kubectl get events --all-namespaces之后，我看到了create Pod logging-es-default-0 in StatefulSet logging-es-default failed error: pods "logging-es-default-0" is forbidden: SecurityContext.RunAsUser is forbidden。这和吊舱安全政策有关吗？如果不允许特权容器，是否可以将ElasticSearch部署到Kubernetes？

编辑:这是我要传递给elasticsearch图表的values.yml文件。

---
clusterName: "elasticsearch"
nodeGroup: "master"

# The service that non master groups will try to connect to when joining the cluster
# This should be set to clusterName + "-" + nodeGroup for your master group
masterService: ""

# Elasticsearch roles that will be applied to this nodeGroup
# These will be set as environment variables. E.g. node.master=true
roles:
  master: "true"
  ingest: "true"
  data: "true"

replicas: 3
minimumMasterNodes: 2

esMajorVersion: ""

# Allows you to add any config files in /usr/share/elasticsearch/config/
# such as elasticsearch.yml and log4j2.properties
esConfig: {}
#  elasticsearch.yml: |
#    key:
#      nestedkey: value
#  log4j2.properties: |
#    key = value

# Extra environment variables to append to this nodeGroup
# This will be appended to the current 'env:' key. You can use any of the kubernetes env
# syntax here
extraEnvs: []
#  - name: MY_ENVIRONMENT_VAR
#    value: the_value_goes_here

# A list of secrets and their paths to mount inside the pod
# This is useful for mounting certificates for security and for mounting
# the X-Pack license
secretMounts: []
#  - name: elastic-certificates
#    secretName: elastic-certificates
#    path: /usr/share/elasticsearch/config/certs

image: "docker.elastic.co/elasticsearch/elasticsearch"
imageTag: "7.4.1"
imagePullPolicy: "IfNotPresent"

podAnnotations: {}
  # iam.amazonaws.com/role: es-cluster

# additionals labels
labels: {}

esJavaOpts: "-Xmx1g -Xms1g"

resources:
  requests:
    cpu: "100m"
    memory: "2Gi"
  limits:
    cpu: "1000m"
    memory: "2Gi"

initResources: {}
  # limits:
  #   cpu: "25m"
  #   # memory: "128Mi"
  # requests:
  #   cpu: "25m"
  #   memory: "128Mi"

sidecarResources: {}
  # limits:
  #   cpu: "25m"
  #   # memory: "128Mi"
  # requests:
  #   cpu: "25m"
  #   memory: "128Mi"

networkHost: "0.0.0.0"

volumeClaimTemplate:
  accessModes: [ "ReadWriteOnce" ]
  resources:
    requests:
      storage: 30Gi

rbac:
  create: false
  serviceAccountName: ""

podSecurityPolicy:
  create: false
  name: ""
  spec:
    privileged: false
    fsGroup:
      rule: RunAsAny
    runAsUser:
      rule: RunAsAny
    seLinux:
      rule: RunAsAny
    supplementalGroups:
      rule: RunAsAny
    volumes:
      - secret
      - configMap
      - persistentVolumeClaim

persistence:
  enabled: true
  annotations: {}

extraVolumes: ""
  # - name: extras
  #   emptyDir: {}

extraVolumeMounts: ""
  # - name: extras
  #   mountPath: /usr/share/extras
  #   readOnly: true

extraInitContainers: ""
  # - name: do-something
  #   image: busybox
  #   command: ['do', 'something']

# This is the PriorityClass settings as defined in
# https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#priorityclass
priorityClassName: ""

# By default this will make sure two pods don't end up on the same node
# Changing this to a region would allow you to spread pods across regions
antiAffinityTopologyKey: "kubernetes.io/hostname"

# Hard means that by default pods will only be scheduled if there are enough nodes for them
# and that they will never end up on the same node. Setting this to soft will do this "best effort"
antiAffinity: "hard"

# This is the node affinity settings as defined in
# https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#node-affinity-beta-feature
nodeAffinity: {}

# The default is to deploy all pods serially. By setting this to parallel all pods are started at
# the same time when bootstrapping the cluster
podManagementPolicy: "Parallel"

protocol: http
httpPort: 9200
transportPort: 9300

service:
  labels: {}
  labelsHeadless: {}
  type: ClusterIP
  nodePort: ""
  annotations: {}
  httpPortName: http
  transportPortName: transport

updateStrategy: RollingUpdate

# This is the max unavailable setting for the pod disruption budget
# The default value of 1 will make sure that kubernetes won't allow more than 1
# of your pods to be unavailable during maintenance
maxUnavailable: 1

podSecurityContext:
  fsGroup: null
  runAsUser: null

# The following value is deprecated,
# please use the above podSecurityContext.fsGroup instead
fsGroup: ""

securityContext:
  capabilities: null
  # readOnlyRootFilesystem: true
  runAsNonRoot: null
  runAsUser: null

# How long to wait for elasticsearch to stop gracefully
terminationGracePeriod: 120

sysctlVmMaxMapCount: 262144

readinessProbe:
  failureThreshold: 3
  initialDelaySeconds: 10
  periodSeconds: 10
  successThreshold: 3
  timeoutSeconds: 5

# https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-health.html#request-params wait_for_status
clusterHealthCheckParams: "wait_for_status=green&timeout=1s"

## Use an alternate scheduler.
## ref: https://kubernetes.io/docs/tasks/administer-cluster/configure-multiple-schedulers/
##
schedulerName: ""

imagePullSecrets: []
nodeSelector: {}
tolerations: []

# Enabling this will publically expose your Elasticsearch instance.
# Only enable this if you have security enabled on your cluster
ingress:
  enabled: false
  annotations: {}
    # kubernetes.io/ingress.class: nginx
    # kubernetes.io/tls-acme: "true"
  path: /
  hosts:
    - chart-example.local
  tls: []
  #  - secretName: chart-example-tls
  #    hosts:
  #      - chart-example.local

nameOverride: ""
fullnameOverride: ""

# https://github.com/elastic/helm-charts/issues/63
masterTerminationFix: false

lifecycle: {}
  # preStop:
  #   exec:
  #     command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
  # postStart:
  #   exec:
  #     command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]

sysctlInitContainer:
  enabled: false

keystore: []

上面列出的值会产生以下错误：

create Pod elasticsearch-master-0 in StatefulSet elasticsearch-master failed error: pods "elasticsearch-master-0" is forbidden: SecurityContext.RunAsUser is forbidden

解决方案:我了解到，当试图将任何其他服务部署到集群中时，istio部署会导致问题。我做了一个错误的假设，认为istio和我的集群安全策略不会导致我的问题。

Answer 1

被禁止，SecurityContext.RunAsUser被禁止。这和吊舱安全政策有关吗？

是的，这正是它要做的

显然，StatefulSet包含了一个securityContext:节，但是您的集群管理员禁止这样的操作。

如果不允许特权容器，

是否能够将ElasticSearch部署到Kubernetes？

这并不是真正发生的事情--不是“特权”部分给您带来问题--而是PodSpec请求以用户身份运行容器，而不是码头映像中的用户。事实上，如果任何现代elasticsearch映像都需要修改用户，我实际上会感到非常惊讶，因为最近所有的映像都没有以root的形式运行。

从securityContext:中删除StatefulSet节，并报告新出现的错误(如果有的话)