SDN-1334: Pod to pod connectivity for OVN

Signed-off-by: Surya Seetharaman <suryaseetharaman.9@gmail.com>

debug-scripts/ovn/pod_to_pod.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+
+create_pod () {
+
+    POD_NAME=${1}
+    DEBUG_NETWORK_NAMESPACE=${2}
+    NODE_SELECTOR_LABEL=${3}
+
+    if [ -z $NODE_SELECTOR_LABEL ]; then
+        cat <<EOF | sed "s/{{POD_NAME}}/$POD_NAME/g" | sed "s/{{DEBUG_NETWORK_NAMESPACE}}/$DEBUG_NETWORK_NAMESPACE/g" | kubectl apply -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: {{POD_NAME}}
+  namespace: {{DEBUG_NETWORK_NAMESPACE}}
+  labels:
+    pod-name: {{POD_NAME}}
+spec:
+  containers:
+  - name: {{POD_NAME}}
+    image: docker.io/centos/tools:latest
+    command:
+      - /sbin/init
+EOF
+    else
+        cat <<EOF | sed "s/{{POD_NAME}}/$POD_NAME/g" | sed "s/{{DEBUG_NETWORK_NAMESPACE}}/$DEBUG_NETWORK_NAMESPACE/g" | sed "s/{{NODE_SELECTOR_LABEL}}/$NODE_SELECTOR_LABEL/g" | kubectl apply -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: {{POD_NAME}}
+  namespace: {{DEBUG_NETWORK_NAMESPACE}}
+  labels:
+    pod-name: {{POD_NAME}}
+spec:
+  containers:
+  - name: {{POD_NAME}}
+    image: docker.io/centos/tools:latest
+    command:
+      - /sbin/init
+  nodeSelector:
+    use: {{NODE_SELECTOR_LABEL}}
+EOF
+    fi
+}
+
+do_pod_to_pod_connectivity_check () {
+
+    src_node=${1}
+    dst_node=${2}
+
+    # create a debug-network namespace
+    DEBUG_NETWORK_NAMESPACE=${DEBUG_NETWORK_NAMESPACE:-"openshift-debug-network"}
+    oc create namespace $DEBUG_NETWORK_NAMESPACE
+
+    # create two pods
+    if [ -z $src_node ] && [ -z $dst_node]; then
+        create_pod "client-debug" $DEBUG_NETWORK_NAMESPACE
+        create_pod "server-debug" $DEBUG_NETWORK_NAMESPACE
+    else
+        oc label nodes $src_node "use=client-pod"
+        oc label nodes $dst_node "use=server-pod" 
+        create_pod "client-debug" $DEBUG_NETWORK_NAMESPACE "client-pod"
+        create_pod "server-debug" $DEBUG_NETWORK_NAMESPACE "server-pod"
+    fi
+
+    # wait till pods are running
+    while [[ $(oc -n $DEBUG_NETWORK_NAMESPACE get pods client-debug -o 'jsonpath={..status.conditions[?(@.type=="Ready")].status}') != "True" ]]; do echo "waiting for pod client-debug" && sleep 1; done
+    while [[ $(oc -n $DEBUG_NETWORK_NAMESPACE get pods server-debug -o 'jsonpath={..status.conditions[?(@.type=="Ready")].status}') != "True" ]]; do echo "waiting for pod server-debug" && sleep 1; done
+
+    client_debug_pod_ip=$(oc get pods -n openshift-debug-network client-debug -o template --template '{{.status.podIP}}')
+    server_debug_pod_ip=$(oc get pods -n openshift-debug-network server-debug -o template --template '{{.status.podIP}}')
+
+    # rsh into the client pod and ping the server
+    if [ oc rsh -n $DEBUG_NETWORK_NAMESPACE client-debug ping $server_debug_pod_ip -c 1 -W 2 &> /dev/null ]; then
+	      echo "ping $server_debug_pod_ip  ->  success"
+    else
+	      echo "ping $server_debug_pod_ip  ->  failed"
+        echo "Running traceroute from client pod to server pod:"
+        oc rsh -n $DEBUG_NETWORK_NAMESPACE client-debug yum install traceroute -y
+        oc rsh -n $DEBUG_NETWORK_NAMESPACE client-debug traceroute $server_debug_pod_ip -m 10
+        # incorportate the logic to use ovnkube-trace to output the ovn/ovs trace 
+        echo "Something is wrong, running the ovnkube-trace and detrace to help figure out the packet route..."
+        # [TODO]: Once ovnkube-trace is packed is oc, we can start using it directly and cleanup the nonsense from the below lines.
+        git clone --single-branch --branch ovnkube-trace https://github.com/mccv1r0/ovn-kubernetes.git && \
+        pushd ovn-kubernetes/go-controller && make && \
+        _output/go/bin/ovnkube-trace --kubeconfig $KUBECONFIG --tcp --dst-port 80  --src client-debug --dst server-debug -dst-namespace $DEBUG_NETWORK_NAMESPACE -src-namespace $DEBUG_NETWORK_NAMESPACE --loglevel=5
+        popd && rm -rf ovn-kubernetes
+    fi
+
+    # delete debug-network namespace
+    oc delete namespace $DEBUG_NETWORK_NAMESPACE
+}
+
+main () {
+    if [ -z "$KUBECONFIG" -o ! -f "$KUBECONFIG" ]; then
+	      die "KUBECONFIG is unset or incorrect"
+	  else
+	      echo "Enter the name of the src node to run the client-debug pod: (leave empty if you do not want to pick a node)"
+        read src_node_name
+        echo "Enter the name of the dst node to run the server-debug pod: (leave empty if you do not want to pick a node)"
+        read dst_node_name
+        do_pod_to_pod_connectivity_check $src_node_name $dst_node_name
+	  fi
+}
+
+main