Virtualbox kubernetes网络接入因特网问题

Question

对于kubernetes来说，我是新手，我使用virtualbox节点作为主节点，使用另一个节点为worker设置两个节点。我不得不重新启动主节点来扩展虚拟机磁盘的大小，但是在重新启动之后，我注意到网络接口在docker0之前没有注意到，我也不能再连接到internet了。

root@kmaster:/home/master# ifconfig -a
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:c0:68:28:15  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s3: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        inet 10.0.2.15  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 08:00:27:d8:7b:e3  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 115563  bytes 23918431 (23.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 115563  bytes 23918431 (23.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

来自/etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

autp enp0s3
iface enp0s3 inet static
address 10.0.2.15

当我运行时，我会面临这样的错误

root@kmaster:/home/master# sudo ip route add default via 10.0.2.1
Error: Nexthop has invalid gateway.

注意:我在运行root@kmaster:/home/master# ip route flush dev enp0s3之前运行sudo ip route add default via 10.0.2.1

当尝试运行kubeadm init --apiserver-advertise-address=10.0.2.15 --pod-network-cidr=10.0.2.0/24时

我面临这个错误

I0409 16:04:10.994564    9270 version.go:96] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
I0409 16:04:10.994714    9270 version.go:97] falling back to the local client version: v1.14.0
[init] Using Kubernetes version: v1.14.0
[preflight] Running pre-flight checks
    [WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'
    [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
error execution phase preflight: [preflight] Some fatal errors occurred:
    [ERROR Port-6443]: Port 6443 is in use
    [ERROR Port-10251]: Port 10251 is in use
    [ERROR Port-10252]: Port 10252 is in use
    [ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
    [ERROR FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
    [ERROR FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
    [ERROR FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
    [ERROR Port-10250]: Port 10250 is in use
    [ERROR Port-2379]: Port 2379 is in use
    [ERROR Port-2380]: Port 2380 is in use
    [ERROR DirAvailable--var-lib-etcd]: /var/lib/etcd is not empty
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

来自/etc/resolv.conf

nameserver 8.8.8.8
options edns0

Answer 1

看来你在这有很多问题。我怀疑它们也是在初始化您的集群之前开始的，因为Kubernetes无法连接到互联网来下载它需要的东西。

1. 销毁当前的VM，并创建一个新的VM(推荐桥接网络)。
2. 验证VM具有网络连接性。
3. 在VM上安装停靠程序。
4. 使用：sudo systemctl enable docker (或适合您的操作系统)启用对接服务(看起来您也错过了此步骤)
5. 验证vm具有网络连接性。
6. 继续进行kubernetes安装和集群初始化。

我怀疑您也不希望您的pod- network指定与您的VM相同的网络，或者以其他方式使用HostNetwork设置。