Add add route feature into client

[sufuf3]

cc linkernetworks/vortex#154

[codecov]

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[sufuf3]

As https://godoc.org/github.com/jessevdk/go-flags#hdr-Available_field_tags said, the short name of the option should be single character. So, I remove short option of route net.
PS. I refer to https://linux.die.net/man/8/route.

[sufuf3]

Fix README.
Please help me review this PR, thank you.

[sufuf3]

Test result

$ kubectl get po
NAME                                   READY     STATUS    RESTARTS   AGE
myapp-pod                              1/1       Running   0          3m
network-controller-server-tcp-695ch    1/1       Running   0          7m
network-controller-server-unix-qh52w   1/1       Running   0          6m
$ kubectl exec -it myapp-pod -- bash
root@myapp-pod:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.244.0.1      0.0.0.0         UG    0      0        0 eth0
10.244.0.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.244.0.0      10.244.0.1      255.255.0.0     UG    0      0        0 eth0
192.168.24.0    0.0.0.0         255.255.255.0   U     0      0        0 eth100
224.0.0.0       0.0.0.0         240.0.0.0       U     0      0        0 eth100

• Client.yml

piVersion: v1
kind: Pod
metadata:
  name: myapp-pod
  labels:
    app: myapp
spec:
  containers:
  - name: myapp-container
    image: ubuntu
    command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  initContainers:
  - name: init-network-client
    image: sdnvortex/network-controller:sufuf3_add-route-options
    command: ["/go/bin/client"]
    args: ["-s=unix:///tmp/vortex.sock", "-b=br100", "-n=eth100", "-i=192.168.24.50/24", "--net=224.0.0.0/4", "-g=0.0.0.0"]
    env:
    - name: POD_NAME
      valueFrom:
        fieldRef:
          fieldPath: metadata.name
    - name: POD_NAMESPACE
      valueFrom:
        fieldRef:
          fieldPath: metadata.namespace
    - name: POD_UUID
      valueFrom:
        fieldRef:
          fieldPath: metadata.uid
    volumeMounts:
    - mountPath: /tmp/
      name: grpc-sock
  restartPolicy: Never
  volumes:
  - name: grpc-sock
    hostPath:
      path: /tmp/vortex/

[John-Lin]

@sufuf3 可以幫我測試一個gw 不是0.0.0.0的嗎

[sufuf3]

Here you go. Can be run, too.

$ kubectl get po
NAME                                   READY     STATUS    RESTARTS   AGE
myapp-pod                              1/1       Running   0          19m
myapp-pod2                             1/1       Running   0          1m
network-controller-server-tcp-695ch    1/1       Running   0          23m
network-controller-server-unix-qh52w   1/1       Running   0          23m
$ kubectl exec -it myapp-pod2 -- bash
root@myapp-pod2:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.244.0.1      0.0.0.0         UG    0      0        0 eth0
10.244.0.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.244.0.0      10.244.0.1      255.255.0.0     UG    0      0        0 eth0
192.168.24.0    0.0.0.0         255.255.255.0   U     0      0        0 eth100
224.0.0.0       0.0.0.0         240.0.0.0       U     0      0        0 eth100

• yaml file

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod2
  labels:
    app: myapp
spec:
  containers:
  - name: myapp-container
    image: ubuntu
    command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  initContainers:
  - name: init-network-client
    image: sdnvortex/network-controller:sufuf3_add-route-options
    command: ["/go/bin/client"]
    args: ["-s=unix:///tmp/vortex.sock", "-b=br100", "-n=eth100", "-i=192.168.24.51/24", "--net=224.0.0.0/4"]
    env:
    - name: POD_NAME
      valueFrom:
        fieldRef:
          fieldPath: metadata.name
    - name: POD_NAMESPACE
      valueFrom:
        fieldRef:
          fieldPath: metadata.namespace
    - name: POD_UUID
      valueFrom:
        fieldRef:
          fieldPath: metadata.uid
    volumeMounts:
    - mountPath: /tmp/
      name: grpc-sock
  restartPolicy: Never
  volumes:
  - name: grpc-sock
    hostPath:
      path: /tmp/vortex/

[John-Lin]

哦 我意思是 gw 可能是1.2.3.4或其他的IP

[sufuf3]

GW 0.0.0.0 表示該路由是直接由 local 傳送，所以 pod 可以被 Create 起來
因為 pod 只和 node 上的 OVS 連接，目前測試 OVS 的 uplink 沒有接到 host 上面的 port [圖一] 。所以沒有可以用的 GW 到達 route。
所以無法被 create，得到 “network is unreachable” 的 error，如圖二

• 圖一

$ sudo ovs-vsctl show
69f80869-0ecf-400d-858b-e35ed18aa96d
    Bridge "br100"
        Port "vethee3eeacf"
            Interface "vethee3eeacf"
        Port "br100"
            Interface "br100"
                type: internal
        Port "veth2bb82b62"
            Interface "veth2bb82b62"
    ovs_version: "2.9.2"

• 圖二

$ kubectl get po -w
NAME                                   READY     STATUS       RESTARTS   AGE
myapp-pod                              1/1       Running      0          30m
myapp-pod2                             1/1       Running      0          12m
myapp-pod3                             0/1       Init:Error   0          4s
network-controller-server-tcp-695ch    1/1       Running      0          34m
network-controller-server-unix-qh52w   1/1       Running      0          34m

$ kubectl logs myapp-pod3 -c init-network-client
2018/07/24 09:29:26 Start to connect to  unix:///tmp/vortex.sock
2018/07/24 09:29:26 myapp-pod3 default 0e64f03b-8f24-11e8-8312-0240c1fa9bf5
2018/07/24 09:29:26 Try to find the network namespace path
2018/07/24 09:29:26 Find network namesace path is sussessful.
2018/07/24 09:29:26 The path is /var/run/docker/netns/d01a08684009.
2018/07/24 09:29:26 Try to connect bridge /var/run/docker/netns/d01a08684009 eth100 br100
2018/07/24 09:29:26 Connect bridge is sussessful.
2018/07/24 09:29:26 Configure interface is sussessful.
2018/07/24 09:29:26 There is something wrong with adding route: rpc error: code = Unknown desc = network is unreachable

• yaml file

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod3
  labels:
    app: myapp
spec:
  containers:
  - name: myapp-container
    image: ubuntu
    command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  initContainers:
  - name: init-network-client
    image: sdnvortex/network-controller:sufuf3_add-route-options
    command: ["/go/bin/client"]
    args: ["-s=unix:///tmp/vortex.sock", "-b=br100", "-n=eth100", "-i=192.168.24.53/24", "--net=224.0.0.0/4", "-g=10.244.0.1"]
    env:
    - name: POD_NAME
      valueFrom:
        fieldRef:
          fieldPath: metadata.name
    - name: POD_NAMESPACE
      valueFrom:
        fieldRef:
          fieldPath: metadata.namespace
    - name: POD_UUID
      valueFrom:
        fieldRef:
          fieldPath: metadata.uid
    volumeMounts:
    - mountPath: /tmp/
      name: grpc-sock
  restartPolicy: Never
  volumes:
  - name: grpc-sock
    hostPath:
      path: /tmp/vortex/

[John-Lin]

ok 了解！