Unable to fully collect metrics, when installing metric-server












0















I have installed the metric server on kubernetes, but its not working and logs



unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:xxx: unable to fetch metrics from Kubelet ... (X.X): Get https:....: x509: cannot validate certificate for 1x.x.

x509: certificate signed by unknown authority


I was able to get metrics if modified the deployment yaml and added



 command:
- /metrics-server
- --kubelet-insecure-tls
- --kubelet-preferred-address-types=InternalIP


this now collects metrics, and kubectl top node returns results...



but logs still show



 E1120 11:58:45.624974       1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-6z6qz: no metrics known for pod
E1120 11:58:45.625289 1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-rzvfj: no metrics known for pod
E1120 12:00:06.462505 1 manager.go:102] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:ip-1x.x.x.eu-west-1.compute.internal: unable to get CPU for container ...discarding data: missing cpu usage metric, unable to fully scrape metrics from source


so questions



1) All this works on minikube, but not on my dev cluster, why would that be?



2) In production i dont want to do insecure-tls.. so can someone please explain why this issue is arising... or point me to some resource.










share|improve this question



























    0















    I have installed the metric server on kubernetes, but its not working and logs



    unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:xxx: unable to fetch metrics from Kubelet ... (X.X): Get https:....: x509: cannot validate certificate for 1x.x.

    x509: certificate signed by unknown authority


    I was able to get metrics if modified the deployment yaml and added



     command:
    - /metrics-server
    - --kubelet-insecure-tls
    - --kubelet-preferred-address-types=InternalIP


    this now collects metrics, and kubectl top node returns results...



    but logs still show



     E1120 11:58:45.624974       1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-6z6qz: no metrics known for pod
    E1120 11:58:45.625289 1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-rzvfj: no metrics known for pod
    E1120 12:00:06.462505 1 manager.go:102] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:ip-1x.x.x.eu-west-1.compute.internal: unable to get CPU for container ...discarding data: missing cpu usage metric, unable to fully scrape metrics from source


    so questions



    1) All this works on minikube, but not on my dev cluster, why would that be?



    2) In production i dont want to do insecure-tls.. so can someone please explain why this issue is arising... or point me to some resource.










    share|improve this question

























      0












      0








      0








      I have installed the metric server on kubernetes, but its not working and logs



      unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:xxx: unable to fetch metrics from Kubelet ... (X.X): Get https:....: x509: cannot validate certificate for 1x.x.

      x509: certificate signed by unknown authority


      I was able to get metrics if modified the deployment yaml and added



       command:
      - /metrics-server
      - --kubelet-insecure-tls
      - --kubelet-preferred-address-types=InternalIP


      this now collects metrics, and kubectl top node returns results...



      but logs still show



       E1120 11:58:45.624974       1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-6z6qz: no metrics known for pod
      E1120 11:58:45.625289 1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-rzvfj: no metrics known for pod
      E1120 12:00:06.462505 1 manager.go:102] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:ip-1x.x.x.eu-west-1.compute.internal: unable to get CPU for container ...discarding data: missing cpu usage metric, unable to fully scrape metrics from source


      so questions



      1) All this works on minikube, but not on my dev cluster, why would that be?



      2) In production i dont want to do insecure-tls.. so can someone please explain why this issue is arising... or point me to some resource.










      share|improve this question














      I have installed the metric server on kubernetes, but its not working and logs



      unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:xxx: unable to fetch metrics from Kubelet ... (X.X): Get https:....: x509: cannot validate certificate for 1x.x.

      x509: certificate signed by unknown authority


      I was able to get metrics if modified the deployment yaml and added



       command:
      - /metrics-server
      - --kubelet-insecure-tls
      - --kubelet-preferred-address-types=InternalIP


      this now collects metrics, and kubectl top node returns results...



      but logs still show



       E1120 11:58:45.624974       1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-6z6qz: no metrics known for pod
      E1120 11:58:45.625289 1 reststorage.go:144] unable to fetch pod metrics for pod dev/pod-6bffbb9769-rzvfj: no metrics known for pod
      E1120 12:00:06.462505 1 manager.go:102] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:ip-1x.x.x.eu-west-1.compute.internal: unable to get CPU for container ...discarding data: missing cpu usage metric, unable to fully scrape metrics from source


      so questions



      1) All this works on minikube, but not on my dev cluster, why would that be?



      2) In production i dont want to do insecure-tls.. so can someone please explain why this issue is arising... or point me to some resource.







      kubernetes






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 20 '18 at 12:03









      user1555190user1555190

      90142549




      90142549
























          1 Answer
          1






          active

          oldest

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          2














          Kubeadm generates the kubelet certificate at /var/lib/kubelet/pki and those certificates (kubelet.crt and kubelet.key) are signed by different CA from the one which is used to generate all other certificates at /etc/kubelet/pki.



          You need to regenerate the kubelet certificates which is signed by your root CA (/etc/kubernetes/pki/ca.crt)



          You can use openssl or cfssl to generate the new certificates(I am using cfssl)



          $ mkdir certs; cd certs
          $ cp /etc/kubernetes/pki/ca.crt ca.pem
          $ cp /etc/kubernetes/pki/ca.key ca-key.pem


          Create a file kubelet-csr.json:



          {
          "CN": "kubernetes",
          "hosts": [
          "127.0.0.1",
          "<node_name>",
          "kubernetes",
          "kubernetes.default",
          "kubernetes.default.svc",
          "kubernetes.default.svc.cluster",
          "kubernetes.default.svc.cluster.local"
          ],
          "key": {
          "algo": "rsa",
          "size": 2048
          },
          "names": [{
          "C": "US",
          "ST": "NY",
          "L": "City",
          "O": "Org",
          "OU": "Unit"
          }]
          }


          Create a ca-config.json file:



          {
          "signing": {
          "default": {
          "expiry": "8760h"
          },
          "profiles": {
          "kubernetes": {
          "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
          ],
          "expiry": "8760h"
          }
          }
          }
          }


          Now generate the new certificates using above files:



          $ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem 
          --config=ca-config.json -profile=kubernetes
          kubelet-csr.json | cfssljson -bare kubelet


          Replace the old certificates with newly generated one:



          $ scp kubelet.pem <nodeip>:/var/lib/kubelet/pki/kubelet.crt
          $ scp kubelet-key.pem <nodeip>:/var/lib/kubelet/pki/kubelet.key


          Now restart the kubelet so that new certificates will take effect on your node.



          $ systemctl restart kubelet


          Look at the following tickets to get the context of issue:



          https://github.com/kubernetes-incubator/metrics-server/issues/146



          Hope this helps.






          share|improve this answer
























          • do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

            – user1555190
            Nov 20 '18 at 12:44











          • Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

            – Prafull Ladha
            Nov 20 '18 at 12:47











          • Thanks... and so if i have two masters... do i need to do that on both?

            – user1555190
            Nov 20 '18 at 13:02











          • Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

            – Prafull Ladha
            Nov 20 '18 at 13:05











          • thank you, il give that a go.

            – user1555190
            Nov 20 '18 at 13:22











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          1 Answer
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          active

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          active

          oldest

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          active

          oldest

          votes









          2














          Kubeadm generates the kubelet certificate at /var/lib/kubelet/pki and those certificates (kubelet.crt and kubelet.key) are signed by different CA from the one which is used to generate all other certificates at /etc/kubelet/pki.



          You need to regenerate the kubelet certificates which is signed by your root CA (/etc/kubernetes/pki/ca.crt)



          You can use openssl or cfssl to generate the new certificates(I am using cfssl)



          $ mkdir certs; cd certs
          $ cp /etc/kubernetes/pki/ca.crt ca.pem
          $ cp /etc/kubernetes/pki/ca.key ca-key.pem


          Create a file kubelet-csr.json:



          {
          "CN": "kubernetes",
          "hosts": [
          "127.0.0.1",
          "<node_name>",
          "kubernetes",
          "kubernetes.default",
          "kubernetes.default.svc",
          "kubernetes.default.svc.cluster",
          "kubernetes.default.svc.cluster.local"
          ],
          "key": {
          "algo": "rsa",
          "size": 2048
          },
          "names": [{
          "C": "US",
          "ST": "NY",
          "L": "City",
          "O": "Org",
          "OU": "Unit"
          }]
          }


          Create a ca-config.json file:



          {
          "signing": {
          "default": {
          "expiry": "8760h"
          },
          "profiles": {
          "kubernetes": {
          "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
          ],
          "expiry": "8760h"
          }
          }
          }
          }


          Now generate the new certificates using above files:



          $ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem 
          --config=ca-config.json -profile=kubernetes
          kubelet-csr.json | cfssljson -bare kubelet


          Replace the old certificates with newly generated one:



          $ scp kubelet.pem <nodeip>:/var/lib/kubelet/pki/kubelet.crt
          $ scp kubelet-key.pem <nodeip>:/var/lib/kubelet/pki/kubelet.key


          Now restart the kubelet so that new certificates will take effect on your node.



          $ systemctl restart kubelet


          Look at the following tickets to get the context of issue:



          https://github.com/kubernetes-incubator/metrics-server/issues/146



          Hope this helps.






          share|improve this answer
























          • do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

            – user1555190
            Nov 20 '18 at 12:44











          • Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

            – Prafull Ladha
            Nov 20 '18 at 12:47











          • Thanks... and so if i have two masters... do i need to do that on both?

            – user1555190
            Nov 20 '18 at 13:02











          • Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

            – Prafull Ladha
            Nov 20 '18 at 13:05











          • thank you, il give that a go.

            – user1555190
            Nov 20 '18 at 13:22
















          2














          Kubeadm generates the kubelet certificate at /var/lib/kubelet/pki and those certificates (kubelet.crt and kubelet.key) are signed by different CA from the one which is used to generate all other certificates at /etc/kubelet/pki.



          You need to regenerate the kubelet certificates which is signed by your root CA (/etc/kubernetes/pki/ca.crt)



          You can use openssl or cfssl to generate the new certificates(I am using cfssl)



          $ mkdir certs; cd certs
          $ cp /etc/kubernetes/pki/ca.crt ca.pem
          $ cp /etc/kubernetes/pki/ca.key ca-key.pem


          Create a file kubelet-csr.json:



          {
          "CN": "kubernetes",
          "hosts": [
          "127.0.0.1",
          "<node_name>",
          "kubernetes",
          "kubernetes.default",
          "kubernetes.default.svc",
          "kubernetes.default.svc.cluster",
          "kubernetes.default.svc.cluster.local"
          ],
          "key": {
          "algo": "rsa",
          "size": 2048
          },
          "names": [{
          "C": "US",
          "ST": "NY",
          "L": "City",
          "O": "Org",
          "OU": "Unit"
          }]
          }


          Create a ca-config.json file:



          {
          "signing": {
          "default": {
          "expiry": "8760h"
          },
          "profiles": {
          "kubernetes": {
          "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
          ],
          "expiry": "8760h"
          }
          }
          }
          }


          Now generate the new certificates using above files:



          $ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem 
          --config=ca-config.json -profile=kubernetes
          kubelet-csr.json | cfssljson -bare kubelet


          Replace the old certificates with newly generated one:



          $ scp kubelet.pem <nodeip>:/var/lib/kubelet/pki/kubelet.crt
          $ scp kubelet-key.pem <nodeip>:/var/lib/kubelet/pki/kubelet.key


          Now restart the kubelet so that new certificates will take effect on your node.



          $ systemctl restart kubelet


          Look at the following tickets to get the context of issue:



          https://github.com/kubernetes-incubator/metrics-server/issues/146



          Hope this helps.






          share|improve this answer
























          • do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

            – user1555190
            Nov 20 '18 at 12:44











          • Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

            – Prafull Ladha
            Nov 20 '18 at 12:47











          • Thanks... and so if i have two masters... do i need to do that on both?

            – user1555190
            Nov 20 '18 at 13:02











          • Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

            – Prafull Ladha
            Nov 20 '18 at 13:05











          • thank you, il give that a go.

            – user1555190
            Nov 20 '18 at 13:22














          2












          2








          2







          Kubeadm generates the kubelet certificate at /var/lib/kubelet/pki and those certificates (kubelet.crt and kubelet.key) are signed by different CA from the one which is used to generate all other certificates at /etc/kubelet/pki.



          You need to regenerate the kubelet certificates which is signed by your root CA (/etc/kubernetes/pki/ca.crt)



          You can use openssl or cfssl to generate the new certificates(I am using cfssl)



          $ mkdir certs; cd certs
          $ cp /etc/kubernetes/pki/ca.crt ca.pem
          $ cp /etc/kubernetes/pki/ca.key ca-key.pem


          Create a file kubelet-csr.json:



          {
          "CN": "kubernetes",
          "hosts": [
          "127.0.0.1",
          "<node_name>",
          "kubernetes",
          "kubernetes.default",
          "kubernetes.default.svc",
          "kubernetes.default.svc.cluster",
          "kubernetes.default.svc.cluster.local"
          ],
          "key": {
          "algo": "rsa",
          "size": 2048
          },
          "names": [{
          "C": "US",
          "ST": "NY",
          "L": "City",
          "O": "Org",
          "OU": "Unit"
          }]
          }


          Create a ca-config.json file:



          {
          "signing": {
          "default": {
          "expiry": "8760h"
          },
          "profiles": {
          "kubernetes": {
          "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
          ],
          "expiry": "8760h"
          }
          }
          }
          }


          Now generate the new certificates using above files:



          $ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem 
          --config=ca-config.json -profile=kubernetes
          kubelet-csr.json | cfssljson -bare kubelet


          Replace the old certificates with newly generated one:



          $ scp kubelet.pem <nodeip>:/var/lib/kubelet/pki/kubelet.crt
          $ scp kubelet-key.pem <nodeip>:/var/lib/kubelet/pki/kubelet.key


          Now restart the kubelet so that new certificates will take effect on your node.



          $ systemctl restart kubelet


          Look at the following tickets to get the context of issue:



          https://github.com/kubernetes-incubator/metrics-server/issues/146



          Hope this helps.






          share|improve this answer













          Kubeadm generates the kubelet certificate at /var/lib/kubelet/pki and those certificates (kubelet.crt and kubelet.key) are signed by different CA from the one which is used to generate all other certificates at /etc/kubelet/pki.



          You need to regenerate the kubelet certificates which is signed by your root CA (/etc/kubernetes/pki/ca.crt)



          You can use openssl or cfssl to generate the new certificates(I am using cfssl)



          $ mkdir certs; cd certs
          $ cp /etc/kubernetes/pki/ca.crt ca.pem
          $ cp /etc/kubernetes/pki/ca.key ca-key.pem


          Create a file kubelet-csr.json:



          {
          "CN": "kubernetes",
          "hosts": [
          "127.0.0.1",
          "<node_name>",
          "kubernetes",
          "kubernetes.default",
          "kubernetes.default.svc",
          "kubernetes.default.svc.cluster",
          "kubernetes.default.svc.cluster.local"
          ],
          "key": {
          "algo": "rsa",
          "size": 2048
          },
          "names": [{
          "C": "US",
          "ST": "NY",
          "L": "City",
          "O": "Org",
          "OU": "Unit"
          }]
          }


          Create a ca-config.json file:



          {
          "signing": {
          "default": {
          "expiry": "8760h"
          },
          "profiles": {
          "kubernetes": {
          "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
          ],
          "expiry": "8760h"
          }
          }
          }
          }


          Now generate the new certificates using above files:



          $ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem 
          --config=ca-config.json -profile=kubernetes
          kubelet-csr.json | cfssljson -bare kubelet


          Replace the old certificates with newly generated one:



          $ scp kubelet.pem <nodeip>:/var/lib/kubelet/pki/kubelet.crt
          $ scp kubelet-key.pem <nodeip>:/var/lib/kubelet/pki/kubelet.key


          Now restart the kubelet so that new certificates will take effect on your node.



          $ systemctl restart kubelet


          Look at the following tickets to get the context of issue:



          https://github.com/kubernetes-incubator/metrics-server/issues/146



          Hope this helps.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 20 '18 at 12:39









          Prafull LadhaPrafull Ladha

          3,290320




          3,290320













          • do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

            – user1555190
            Nov 20 '18 at 12:44











          • Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

            – Prafull Ladha
            Nov 20 '18 at 12:47











          • Thanks... and so if i have two masters... do i need to do that on both?

            – user1555190
            Nov 20 '18 at 13:02











          • Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

            – Prafull Ladha
            Nov 20 '18 at 13:05











          • thank you, il give that a go.

            – user1555190
            Nov 20 '18 at 13:22



















          • do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

            – user1555190
            Nov 20 '18 at 12:44











          • Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

            – Prafull Ladha
            Nov 20 '18 at 12:47











          • Thanks... and so if i have two masters... do i need to do that on both?

            – user1555190
            Nov 20 '18 at 13:02











          • Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

            – Prafull Ladha
            Nov 20 '18 at 13:05











          • thank you, il give that a go.

            – user1555190
            Nov 20 '18 at 13:22

















          do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

          – user1555190
          Nov 20 '18 at 12:44





          do i need to ssh onto my cluster? and execute these commands... these are not done via kubectl?

          – user1555190
          Nov 20 '18 at 12:44













          Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

          – Prafull Ladha
          Nov 20 '18 at 12:47





          Yes you need to login to your master node and generate those certificates by following the steps. No, there is no need of kubectl commands as we are generating certificates only.

          – Prafull Ladha
          Nov 20 '18 at 12:47













          Thanks... and so if i have two masters... do i need to do that on both?

          – user1555190
          Nov 20 '18 at 13:02





          Thanks... and so if i have two masters... do i need to do that on both?

          – user1555190
          Nov 20 '18 at 13:02













          Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

          – Prafull Ladha
          Nov 20 '18 at 13:05





          Yes you need to replace the kubelet.crt and kubelet.key on all the nodes. Keep in mind you need to generate the new certs for each, changing the node_name in kubelet_csr.json file and repeat those steps.

          – Prafull Ladha
          Nov 20 '18 at 13:05













          thank you, il give that a go.

          – user1555190
          Nov 20 '18 at 13:22





          thank you, il give that a go.

          – user1555190
          Nov 20 '18 at 13:22




















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