Kibana not connecting to Elasticsearch when providing external Certificate

Vineeth_varma · November 30, 2021, 5:32am

Hi Team,

I was Using Elastic Cloud On Kubernetes . So for my Elasticsearch and Kibana I want to use my own Certificates, But when provided the certificates I was getting issues like the Kibana not able to connect to Elasticsearch.

tls:
  certificate:
     secretName:  <my-secret-name>

This is the configuration I did in both Kibana and Elasticsearch.
Issues:

Unable to retrive version Informaion from Elasticsearch, unable to verify the first certificate

Can anyone please help me on this.

Vineeth_varma · December 2, 2021, 7:13am

Can any one guide me please, it will be impacting our delivery and the option of going with Elastic Licence or not?

michael.morello · December 2, 2021, 9:00am

Could you check that the Elasticsearch certificate contains either the full certification chain, or that Kibana is setup to trust your CA ?

Vineeth_varma · December 2, 2021, 10:15am

Yes the Elasticsearch contains all the three certificates like "ca.crt,tls.crt,tls.key".
Can you explain the setup in kibana to trust Elasticsearch CA, So that I can verify whether I have done correctly or not.
In my first comment I mentioned how I configured.

Thanks @michael.morello

michael.morello · December 2, 2021, 10:55am

Assuming the 2 following points:

the secret my-secret-name has been correctly created using the following command: kubectl create secret generic my-secret-name --from-file=ca.crt=ca.crt --from-file=tls.crt=es-cert.crt --from-file=tls.key=es-cert-key.pem
ca.crt can be used to validate es-cert.crt

Then the operator should automatically make ca.crt available in the Kibana Pod, in the /usr/share/kibana/config/elasticsearch-certs/ca.crt file, which is used by Kibana to trust Elasticsearch.

Could you check that there is no error in the operator logs ?
Could you enter the Kibana Pod and use the following curl command: curl --cacert /usr/share/kibana/config/elasticsearch-certs/ca.crt -v https://clustername-es-http.namespace.svc:9200 ? If you have an error about curl not being able to verify the legitimacy of the server then it means that the CA certificate is either not the right one, or not updated by the operator.

Vineeth_varma · December 2, 2021, 12:15pm

I have created the secret just like how you mentioned in Elasticsearch.
But still the same issue :["error","savedobjects-service"],"pid":1215,"message":"Unable to retrieve version information from Elasticsearch nodes. unable to verify the first certificate"}
But one point I didnt understand you said operator automatically make ca.crt does this mean we dont have to configure anything to kibana?

I was passing ca.crt of Elasticsearch to kibana as follows:
elasticsearch.ssl.certificateAuthorities: [ "/usr/share/kibana/config/elasticsearch-certs/ca.crt" ]

the operator error message is :
"No internal CA certificate Secret found, creating a new one","service.version":"1.8.0+4f367c38","service.type":"eck","ecs.version":"1.4.0","owner_namespace":"vineeth","owner_name":"kibana","ca_type":"http"}

Thanks @michael.morello

michael.morello · December 2, 2021, 12:31pm

Yes, as long as the root CA cert (ca.crt) is available in the secret then the operator should propagate and configure Kibana automatically.

This message is logged at the info level and might be expected when Kibana is created. I don't think it is relevant here.

Vineeth_varma · December 2, 2021, 3:14pm

I have just followed how you said but still I was getting the same issue.
["error","savedobjects-service"],"pid":1215,"message":"Unable to retrieve version information from Elasticsearch nodes. unable to verify the first certificate"}

michael.morello · December 6, 2021, 1:03pm

Could you provide both the manifests for Elasticsearch and Kibana, and also the output of the curl command in the Kibana pod as mentioned in my previous message ?

Thanks

Vineeth_varma · December 7, 2021, 5:42am

Okay @michael.morello

Elasticsearch.yaml

apiVersion: v1
kind: Elasticsearch
metadata:
  name: elastic
  namespace: elastic
spec:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.15.0
    auth: {}
    http:
      service:
        metadata:
          annotations: {}
        spec:
          ports:
          - name: https
            nodePort: 30761
            port: 30040
            protocol: TCP
            targetPort: 9200
          type: LoadBalancer
      tls:
        certificate:
          secretName: myown-signed-certs
    image: docker.elastic.co/elasticsearch/elasticsearch:7.15.0
    monitoring:
      logs: {}
      metrics: {}
    nodeSets:
    - config:
        node.data: false
        node.ingest: false
        node.master: true
        node.remote_cluster_client: false
        path.repo:
        - /usr/share/elasticsearch/logs
      count: 1
      name: master
      podTemplate:
        metadata: {}
        spec:
          containers:
          - env:
            - name: ES_JAVA_OPTS
              value: -Xms1g -Xmx1g
            name: elasticsearch
            resources:
              limits:
                cpu: 200m
                memory: 2Gi
              requests:
                cpu: 200m
                memory: 2Gi
            securityContext:
              runAsGroup: 1000
              runAsUser: 1000
            volumeMounts:
            - mountPath: /usr/share/elasticsearch/config/log4j2.properties
              name: log4j
              subPath: log4j2.properties
            - mountPath: /usr/share/elasticsearch/logs
              name: logs-backup
          initContainers:
          - name: elastic-internal-init-filesystem
            resources: {}
            securityContext:
              privileged: true
              runAsUser: 1000
          - command:
            - sh
            - -c
            - chown -R 1000:1000 /usr/share/elasticsearch/data && chown -R 1000:1000
              /usr/share/elasticsearch/logs && mkdir -p /usr/share/elasticsearch/logs/hourly
              && mkdir -p /usr/share/elasticsearch/logs/daily && mkdir -p /usr/share/elasticsearch/logs/weekly
              && mkdir -p /usr/share/elasticsearch/logs/monthly && sysctl -w vm.max_map_count=262144
            name: sysctl
            resources:
              limits:
                cpu: 100m
                memory: 128Mi
              requests:
                cpu: 100m
                memory: 128Mi
            securityContext:
              privileged: true
          volumes:
          - configMap:
              name: log4j
            name: log4j
          - name: logs-backup
            persistentVolumeClaim:
              claimName: elastic-master-backup
      volumeClaimTemplates:
      - metadata:
          name: elasticsearch-data
        spec:
          accessModes:
          - ReadWriteOnce
          resources:
            requests:
              storage: 2Gi
          storageClassName: ebs-sc
        status: {}
    - config:
        node.data: true
        node.ingest: true
        node.master: false
        path.repo:
        - /usr/share/elasticsearch/logs
      count: 1
      name: ingest-data
      podTemplate:
        metadata: {}
        spec:
          affinity:
            podAntiAffinity:
              preferredDuringSchedulingIgnoredDuringExecution:
              - podAffinityTerm:
                  labelSelector:
                    matchLabels:
                      elasticsearch.k8s.elastic.co/cluster-name: elastic
                  topologyKey: kubernetes.io/hostname
                weight: 100
          containers:
          - env:
            - name: ES_JAVA_OPTS
              value: -Xms1g -Xmx1g
            name: elasticsearch
            resources:
              limits:
                cpu: "1"
                memory: 2Gi
              requests:
                cpu: "1"
                memory: 2Gi
            securityContext:
              runAsGroup: 1000
              runAsUser: 1000
            volumeMounts:
            - mountPath: /usr/share/elasticsearch/config/log4j2.properties
              name: log4j
              subPath: log4j2.properties
            - mountPath: /usr/share/elasticsearch/logs
              name: logs-backup
          initContainers:
          - name: elastic-internal-init-filesystem
            resources: {}
            securityContext:
              privileged: true
              runAsUser: 1000
          - command:
            - sh
            - -c
            - chown -R 1000:1000 /usr/share/elasticsearch/data && chown -R 1000:1000
              /usr/share/elasticsearch/logs && mkdir -p /usr/share/elasticsearch/logs/hourly
              && mkdir -p /usr/share/elasticsearch/logs/daily && mkdir -p /usr/share/elasticsearch/logs/weekly
              && mkdir -p /usr/share/elasticsearch/logs/monthly && sysctl -w vm.max_map_count=262144
            name: sysctl
            resources:
              limits:
                cpu: 100m
                memory: 128Mi
              requests:
                cpu: 100m
                memory: 128Mi
            securityContext:
              privileged: true
          volumes:
          - configMap:
              name: log4j
            name: log4j
          - name: logs-backup
            persistentVolumeClaim:
              claimName: elastic-data-backup
      volumeClaimTemplates:
      - metadata:
          name: elasticsearch-data
        spec:
          accessModes:
          - ReadWriteOnce
          resources:
            requests:
              storage: 20Gi
          storageClassName: ebs-sc
        status: {}
    transport:
      service:
        metadata: {}
        spec: {}
      tls:
        certificate: {}
    updateStrategy:
      changeBudget: {}
    version: 7.15.0

Kibana.yaml

  apiVersion: kibana.k8s.elastic.co/v1
  kind: Kibana
  metadata:
    labels:
      app.kubernetes.io/managed-by: Helm
    name: kibana
    namespace: elastic
  spec:
    config:
      elasticsearch.hosts:
      - https://<host_Ip>:30040
    count: 1
    elasticsearchRef:
      name: elastic
      namespace: elastic
    enterpriseSearchRef:
      name: ""
    http:
      service:
        metadata:
          annotations: {}
        spec:
          ports:
          - name: https
            port: 30041
            protocol: TCP
            targetPort: 5601
          type: LoadBalancer
      tls:
        certificate: {}
    image: docker.elastic.co/kibana/kibana:7.15.0
    monitoring:
      logs: {}
      metrics: {}
    podTemplate:
      metadata:
        creationTimestamp: null
      spec:
        containers:
        - name: kibana
          resources:
            limits:
              cpu: "1"
              memory: 2Gi
            requests:
              cpu: "1"
              memory: 2Gi
          securityContext:
            runAsGroup: 7282723
            runAsUser: 64000
    version: 7.15.0

These are my configuration files and Operator I am deploying from the ECK documentation directly with the help of thsi command.

helm install elastic-operator elastic/eck-operator -n elastic-system --create-namespace

If need any further info I will provide that as well.

Thanks @michael.morello.

Vineeth_varma · December 7, 2021, 5:54am

Curl command inside kibana pod:

curl --cacert /usr/share/kibana/config/elasticsearch-certs/ca.crt -v https://clustername-es-http.namespace.svc:30040
* Rebuilt URL to: https://clustername-es-http.namespace.svc:30040/
*   Trying 18.116.243.43...
* TCP_NODELAY set
* Connected to clustername-es-http.namespace.svc (18.116.243.43) port 30040 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /usr/share/kibana/config/elasticsearch-certs/ca.crt
  CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (OUT), TLS alert, unknown CA (560):
* SSL certificate problem: unable to get local issuer certificate
* Closing connection 0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

I think the issue is clear, it is because of ca.crt but I have provided the exact ca.crt which I was using in Elasticsearch.

Could you please help me to debug and resolve the issue.

Thanks @michael.morello

Vineeth_varma · December 9, 2021, 10:40am

Hi from the above issue can you tell me what I have to do to resolve the issue as I was using the correct ca.crt.

Thanks @michael.morello

Vineeth_varma · December 14, 2021, 12:01pm

One question is the dns of the service like elastic-es-http.namespace.svc has to match the CN mentioned in the certificate ? @michael.morello @elasticfran

Thanks

system · January 11, 2022, 12:01pm

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