kuberbetes部署和启动正常，但是kube-dns持续重启

使用命令

kubectl get pods --all-namespaces

得到结果

从图中可以看出kube-dns-c7d85897f-jmntw 在不断重启

使用命令

 kubectl describe pod kube-dns-c7d85897f-jmntw -n kube-system

得到结果

Name:           kube-dns-c7d85897f-jmntw

Namespace:      kube-system

Node:           172.18.196.2/172.18.196.2

Start Time:     Tue,  Jun  :: +

Labels:         k8s-app=kube-dns

                pod-template-hash=

Annotations:    scheduler.alpha.kubernetes.io/critical-pod=

Status:         Running

IP:             172.20.1.9

Controlled By:  ReplicaSet/kube-dns-c7d85897f

Containers:

  kubedns:

    Container ID:  docker://516c137ece876a83fc16d26a4fb2c526d8daa75423d1f2371b0b2142bfd2e00a

    Image:         mirrorgooglecontainers/k8s-dns-kube-dns-amd64:1.14.

    Image ID:      docker-pullable://mirrorgooglecontainers/k8s-dns-kube-dns-amd64@sha256:956ac5f14a388ab9887ae07f36e770852f3f51dcac9e0d193ce8f62cbf066b13

    Ports:         /UDP, /TCP, /TCP

    Args:

      --domain=cluster.local.

      --dns-port=

      --config-dir=/kube-dns-config

      --v=

    State:          Running

      Started:      Tue,  Jun  :: +

    Ready:          True

    Restart Count:

    Limits:

      memory:  170Mi

    Requests:

      cpu:      100m

      memory:   70Mi

    Liveness:   http-get http://:10054/healthcheck/kubedns delay=60s timeout=5s period=10s #success=1 #failure=5

    Readiness:  http-get http://:8081/readiness delay=3s timeout=5s period=10s #success=1 #failure=3

    Environment:

      PROMETHEUS_PORT:

    Mounts:

      /kube-dns-config from kube-dns-config (rw)

      /var/run/secrets/kubernetes.io/serviceaccount from kube-dns-token-2ndrd (ro)

  dnsmasq:

    Container ID:  docker://5871fe23f088d23dd342fa7a891be0b5b9f3f879a0902e6633baaa418b2a920f

    Image:         mirrorgooglecontainers/k8s-dns-dnsmasq-nanny-amd64:1.14.

    Image ID:      docker-pullable://mirrorgooglecontainers/k8s-dns-dnsmasq-nanny-amd64@sha256:38f69fab59a32a490c8c62b035f6aa8dbf9a320686537225adaee16a07856d17

    Ports:         /UDP, /TCP

    Args:

      -v=

      -logtostderr

      -configDir=/etc/k8s/dns/dnsmasq-nanny

      -restartDnsmasq=true

      --

      -k

      --cache-size=

      --log-facility=-

      --server=/cluster.local./127.0.0.1#

      --server=/in-addr.arpa/127.0.0.1#

      --server=/ip6.arpa/127.0.0.1#

    State:          Running

      Started:      Tue,  Jun  :: +

    Last State:     Terminated

      Reason:       Error

      Exit Code:

      Started:      Tue,  Jun  :: +

      Finished:     Tue,  Jun  :: +

    Ready:          True

    Restart Count:

    Requests:

      cpu:        150m

      memory:     20Mi

    Liveness:     http-get http://:10054/healthcheck/dnsmasq delay=60s timeout=5s period=10s #success=1 #failure=5

    Environment:  <none>

    Mounts:

      /etc/k8s/dns/dnsmasq-nanny from kube-dns-config (rw)

      /var/run/secrets/kubernetes.io/serviceaccount from kube-dns-token-2ndrd (ro)

  sidecar:

    Container ID:  docker://bffdb2ace942a0608c2a35e34098d0b43519cce8778371fd96ac549300bf9897

    Image:         mirrorgooglecontainers/k8s-dns-sidecar-amd64:1.14.

    Image ID:      docker-pullable://mirrorgooglecontainers/k8s-dns-sidecar-amd64@sha256:7caad6678b148c0c74f8b84efa93ddde84e742fa37b25d20ecfdbd43fba74360

    Port:          /TCP

    Args:

      --v=

      --logtostderr

      --probe=kubedns,127.0.0.1:,kubernetes.default.svc.cluster.local.,,A

      --probe=dnsmasq,127.0.0.1:,kubernetes.default.svc.cluster.local.,,A

    State:          Running

      Started:      Tue,  Jun  :: +

    Last State:     Terminated

      Reason:       Error

      Exit Code:

      Started:      Tue,  Jun  :: +

      Finished:     Tue,  Jun  :: +

    Ready:          True

    Restart Count:

    Requests:

      cpu:        10m

      memory:     20Mi

    Liveness:     http-get http://:10054/metrics delay=60s timeout=5s period=10s #success=1 #failure=5

    Environment:  <none>

    Mounts:

      /var/run/secrets/kubernetes.io/serviceaccount from kube-dns-token-2ndrd (ro)

Conditions:

  Type           Status

  Initialized    True

  Ready          True

  PodScheduled   True

Volumes:

  kube-dns-config:

    Type:      ConfigMap (a volume populated by a ConfigMap)

    Name:      kube-dns

    Optional:  true

  kube-dns-token-2ndrd:

    Type:        Secret (a volume populated by a Secret)

    SecretName:  kube-dns-token-2ndrd

    Optional:    false

QoS Class:       Burstable

Node-Selectors:  <none>

Tolerations:     CriticalAddonsOnly

Events:

  Type     Reason     Age               From                   Message

  ----     ------     ----              ----                   -------

  Warning  Unhealthy  8m (x41 over 1h)  kubelet, 172.18.196.2  Liveness probe failed: HTTP probe failed with statuscode:

  Warning  Unhealthy  7m (x15 over 1h)  kubelet, 172.18.196.2  Liveness probe failed: Get http://172.20.1.9:10054/healthcheck/kubedns: dial tcp 172.20.1.9:10054: getsockopt: connection refused

这里有两个warning ，不知道什么原因

使用命令

kubectl logs -n kube-system kube-dns-c7d85897f-jmntw -c dnsmasq

得到结果

I0605 ::08.863881        main.go:] opts: {{/usr/sbin/dnsmasq [-k --cache-size= --log-facility=- --server=/cluster.local./127.0.0.1# --server=/in-addr.arpa/127.0.0.1# --server=/ip6.arpa/127.0.0.1#] true} /etc/k8s/dns/dnsmasq-nanny }

I0605 ::08.863997        nanny.go:] Starting dnsmasq [-k --cache-size= --log-facility=- --server=/cluster.local./127.0.0.1# --server=/in-addr.arpa/127.0.0.1# --server=/ip6.arpa/127.0.0.1#]

I0605 ::09.049758        nanny.go:]

W0605 ::09.049779        nanny.go:] Got EOF from stdout

I0605 ::09.049789        nanny.go:] dnsmasq[]: started, version 2.78 cachesize

I0605 ::09.049795        nanny.go:] dnsmasq[]: compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth no-DNSSEC loop-detect inotify

I0605 ::09.049800        nanny.go:] dnsmasq[]: using nameserver 127.0.0.1# for domain ip6.arpa

I0605 ::09.049803        nanny.go:] dnsmasq[]: using nameserver 127.0.0.1# for domain in-addr.arpa

I0605 ::09.049807        nanny.go:] dnsmasq[]: using nameserver 127.0.0.1# for domain cluster.local

I0605 ::09.049811        nanny.go:] dnsmasq[]: reading /etc/resolv.conf

I0605 ::09.049815        nanny.go:] dnsmasq[]: using nameserver 127.0.0.1# for domain ip6.arpa

I0605 ::09.049819        nanny.go:] dnsmasq[]: using nameserver 127.0.0.1# for domain in-addr.arpa

I0605 ::09.049823        nanny.go:] dnsmasq[]: using nameserver 127.0.0.1# for domain cluster.local

I0605 ::09.049827        nanny.go:] dnsmasq[]: using nameserver 127.0.1.1#

I0605 ::09.049836        nanny.go:] dnsmasq[]: read /etc/hosts -  addresses

I0605 ::50.451300        nanny.go:] dnsmasq[]: Maximum number of concurrent DNS queries reached (max: )

I0605 ::00.464414        nanny.go:] dnsmasq[]: Maximum number of concurrent DNS queries reached (max: )

从这里可以看出nameserver是少了个节点上的nameserver

其实这里是因为忘了改node节点上的nameserver

修改 /etc/resolv.conf的nameserver

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alt="" />

改成学校的域名服务器，注意每一个node上都要改，因为不知道dns服务会部署在哪个node上

然后再重启kubedns的服务

kubectl delete pod -n kube-system kube-dns-69bf9d5cc9-c68mw

看到nameserver用了10.8.8.8就可以了

但是通常集群都有好多个节点，一个一个节点修改太慢了，下面再补充一个利用ansible 修改集群所有节点的nameserver

root@ht-:/etc/ansible# ansible all -m lineinfile -a "dest=/etc/resolv.conf regexp='nameserver 127.0.1.1' line='nameserver 10.8.8.8'"

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