Hello, i was trying to create a 2 nodes - 2 machines cluster.
i’m using 2 centOS virtual machines (on virtualbox) on a company network, using Kubeadm
i’m also using Weave network as a network plugin.
afterward, i’ve just tried to create a simple deployment of nginx with the following yaml file:
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2 kind: Deployment metadata: name: nginx-deployment spec: selector: matchLabels: app: nginx replicas: 2 # tells deployment to run 2 pods matching the template template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 ports: - containerPort: 80
The deployment went well, and i can see the following:
[root@arielKuber ~]# kubectl get pods -l run=my-nginx -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE my-nginx-756f645cd7-87b54 1/1 Running 2 23h 10.32.48.3 arielkuber2 <none> my-nginx-756f645cd7-9ts6k 1/1 Running 1 23h 10.32.48.2 arielkuber2 <none> [root@arielKuber ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION arielkuber Ready master 23h v1.12.0 arielkuber2 Ready <none> 23h v1.12.0
- Ping from master node to the pods does not work, but it does work from the slave node:
[root@arielKuber ~]# ping 10.32.48.2 PING 10.32.48.2 (10.32.48.2) 56(84) bytes of data. From 10.32.0.1 icmp_seq=1 Destination Host Unreachable From 10.32.0.1 icmp_seq=2 Destination Host Unreachable
root@my-nginx-756f645cd7-87b54:/# ping 10.32.48.2 PING 10.32.48.2 (10.32.48.2) 56(84) bytes of data. 64 bytes from 10.32.48.2: icmp_seq=1 ttl=64 time=0.216 ms 64 bytes from 10.32.48.2: icmp_seq=2 ttl=64 time=0.163 ms
I’m guessing 10.32.0.1 should be k8s dns server? but it’s not reachable from master
- another issue, that the pods are created without access to the internet, their resolv.conf file is different from as i create a plain docker container, and they don’t contain the correct DNS server of the hosts:
in the hosts:
search company.com nameserver #IP1 nameserver #IP2
but in the containers created by the pods:
search default.svc.cluster.local svc.cluster.local cluster.local company.com
I’m a bit confused about the networking there, any assistance would be appreciated.