kube-dns不工作

Question

我已经创建了集群(Centos 7)，并使用kube-dns部署了rc。群集工作正常，但kube-dns会在日志中打印错误。

    I0817 12:40:01.589924       1 dns.go:299] could not find service for endpoint "kubernetes" in namespace "default"
I0817 12:40:01.591584       1 dns.go:299] could not find service for endpoint "kube-scheduler" in namespace "kube-system"
I0817 12:40:01.591608       1 dns.go:299] could not find service for endpoint "kube-controller-manager" in namespace "kube-system"
I0817 12:40:01.591620       1 dns.go:299] could not find service for endpoint "kube-dns" in namespace "kube-system"

apiserver：### # kubernetes system config ##以下值用于配置kube-apiserver #

# The address on the local server to listen to.
KUBE_API_ADDRESS="--address=0.0.0.0"

# The port on the local server to listen on.
KUBE_API_PORT="--port=8080"

# Port minions listen on
KUBELET_PORT="--kubelet-port=10250"

# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.10.150.0/19"

# default admission control policies
KUBE_ADMISSION_CONTROL="NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
# Add your own!

主配置文件：

KUBE_LOGTOSTDERR="--logtostderr=true"

ENABLE_CLUSTER_DNS="${KUBE_ENABLE_CLUSTER_DNS:-true}"
DNS_SERVER_IP="10.10.150.250"
DNS_DOMAIN="cluster.local"
DNS_REPLICAS=1

# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"

# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://127.0.0.1:8080"

有人知道发生了什么吗？)

Answer 1

问题出在我的SELinux..。当我禁用它，一切都正常了。

Answer 2

https://github.com/kubernetes/kubernetes/blob/master/hack/local-up-cluster.sh#L352

要使DNS正常工作，KUBE_ENABLE_CLUSTER_DNS应为true。--cluster-dns=10.10.150.250 --cluster_domain=cluster.local