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Configuration and Troubleshooting Tools

contiv-netctl

contiv-netctl is a command line interface for querying the status of Contiv-VPP vswitches in a K8s cluster that is using Contiv-VPP CNI plugin. This overview covers contiv-netctl syntax, describes the available commands, and provides common examples. contiv-netctl is installed on the K8s-master host during the installation of the Contiv-VPP CNI plugin.

Syntax

Use the following syntax to run contiv-netctl commands from your terminal window:

contiv-netctl [operation] [node] [parameters] [flags]

where operation, node, parameters, and flags are:

  • command: specifies the query operation to be performed on one or more vswitches in the cluster
  • node: optional, specifies the node where the query operation is to be executed. For some query operations, if node is not specified, the operation is performed on all nodes.
  • parameters: optional, specifies parameters to the query operation
  • flags: Specifies optional flags. Currently, only the -h flag is supported; when specified, help text for the specified operation(s) is printed to stdout.

Operations

The following table includes short descriptions and the general syntax for contiv-netctl operations:

Operation Syntax Description
help contiv-netctl help Prints out help about any command
ipam contiv-netctl ipam [NODE] [-h] Show ipam info for [NODE], or for all nodes if [NODE] not specified
nodes contiv-netctl nodes [-h] Show vswitch summary status info
pods contiv-netctl pods [NODE] [-h] Show pods and their respective vpp-side interfaces for specified [NODE], or for all nodes if [NODE] not specified
vppcli contiv-netctl vppcli NODE [vpp-dbg-cli-cmd] [-h] Execute the specified [vpp-dbg-cli-cmd] on the specified NODE
vppdump contiv-netctl vppdump NODE [vpp-agent-resource] [-h] Get the specified [vpp-agent-resource] from VPP Agent on the specified NODE

Configuration

Since contiv-netctl connects to vswitches via REST and uses Contiv-ETCD it requires corresponding config files. They can be defined using command line arguments --etcd-config and --http-client-config or environment variables ETCD_CONFIG, HTTP_CLIENT_CONFIG.

etcd.conf

insecure-transport: true
dial-timeout: 1000000000
endpoints:
 - "127.0.0.1:32379"

http.client.conf

port: 9999
use-https: true
basic-auth: "admin:pass"
verify-server-cert: false

For more advanced etcd config see example.

Examples

// Print out help.
$ contiv-netctl

// Print out ipam information for all nodes.
$ contiv-netctl ipam

// Print out ipam information for node k8s-master.
$ contiv-netctl ipam k8s-master

// Print out node information for all nodes.
$ contiv-netctl nodes

// Print out pod information for all nodes.
$ contiv-netctl pods

// Print out ipam information for node k8s-mworker1.
$ contiv-netctl pods k8s-worker1

// Execute the VPP 'sh int addr' command on node k8s-mworker2.
$ contiv-netctl vppcli k8s-worker2 sh int addr

// Get the available REST resources from VPP Agent on node k8s-master.
$ contiv-netctl vppdump k8s-master

// Get the Bridge Domains resource from VPP Agent on node k8s-master.
$ contiv-netctl vppdump k8s-master bd

Contiv -VPP Custom Resource Definitions (CRDs)

A resource is an endpoint in the Kubernetes API that stores a collection of API objects of a certain kind. For example, the built-in pods resource contains a collection of Pod objects. A custom resource is an extension of the Kubernetes API that is not necessarily available on every Kubernetes cluster. In other words, it represents a customization of a particular Kubernetes installation.

Contiv-VPP defines the following custom resources:

  • nodeconfigs.nodeconfig.contiv.vpp: used to configure Contiv-VPP vswitch parameters, such as the VPP GigE interface IP address or the vswitch Node ID.

    To configure a node using the configuration CRD, first create a manifest file, for example here or as shown below:

    # Configuration for node in the cluster
    apiVersion: nodeconfig.contiv.vpp/v1
    kind: NodeConfig
    metadata:
      name: k8s-master
    spec:
      mainVPPInterface:
        interfaceName: "GigabitEthernet0/8/0"
        ip: "192.168.16.1/24"
    

    and the use kubectl to apply the configuration:

    kubectl apply -f <configuration-file>
    

    You can also get the current cluster configration as follows:

    kubectl get nodeconfigs.nodeconfig.contiv.vpp -o json
    
  • telemetryreports.telemetry.contiv.vpp: provides telemetry data from all Contiv-VPP vswitches in the cluster. The telemetry data is basically a dump of VPP state and a report on the health of the Contiv-VPP network provided by the network validator.

    To print the telemetry data to stdout, type:

    $ kubectl get telemetryreports.telemetry.contiv.vpp -o json
    

In order to use CRDs you need to:

  • In the vagrant world edit the value of export CRD_DISABLED=${CRD_DISABLED:-true} to false found in this file: https://github.com/contiv/vpp/blob/master/vagrant/defaults

  • In the manual setup use helm to generate the contiv-vpp.yaml with CRDs enabled:

    $ helm template --name foo --set contiv.crdNodeConfigurationDisabled=false --set contiv.ipamConfig.contivCIDR=10.128.0.0/14 $cvpp_dir/k8s/contiv-vpp > $cvpp_dir/k8s/contiv-vpp/foo.yaml
    
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