k8s怎么安装dns
时间: 2024-06-15 20:03:46 浏览: 15
在Kubernetes中,DNS(Domain Name System)用于解析服务名称到相应的IP地址。要安装DNS,可以按照以下步骤进行操作:
1. 首先,确保你已经安装了Kubernetes集群,并且具有足够的权限来进行操作。
2. 使用kubectl命令创建一个DNS配置文件,例如`dns.yaml`,并将以下内容添加到文件中:
```yaml
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.96.0.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: kube-dns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kube-dns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: kube-dns
namespace: kube-system
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
spec:
replicas: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
containers:
- name: coredns
image: k8s.gcr.io/coredns:1.8.0
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: ["-conf", "/etc/coredns/Corefile"]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
```
3. 使用kubectl命令创建DNS服务和相关资源:
```shell
kubectl apply -f dns.yaml
```
4. 等待一段时间,直到DNS服务正常运行。你可以使用以下命令检查DNS服务的状态:
```shell
kubectl get pods -n kube-system -l k8s-app=kube-dns
```
如果所有的Pod都处于`Running`状态,表示DNS服务已经安装成功。
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