vFW Traffic Distribution Use Case

Description

The purpose of this work is to show Traffic Distribiution functionality implemented in Casablanca nad Dublin releases on vFW Use Case. The orchstration workflow triggers a change to traffic distribution (redistribution) done by a traffic balancing/distribution entity (aka anchor point). The DistributeTraffic action targets the traffic balancing/distribution entity, in some cases DNS, other cases a load balancer external to the VNF instance, as examples. Traffic distribution (weight) changes intended to take a VNF instance out of service are completed only when all in-flight traffic/transactions have been completed. DistributeTrafficCheck command may be used to verify initial conditions of redistribution or can be used to verify the state of VNFs and redistribution itself. To complete the traffic redistribution process, gracefully taking a VNF instance out-of-service/into-service, without dropping in-flight calls or sessions, QuiesceTraffic/ResumeTraffic command may need to follow traffic distribution changes (assigning weight 0 or very low weight to VNF instance). The VNF application remains in an active state.

Traffic Distribution functionality is an outcome of Change Management project. Further details can be found on following pages

https://wiki.onap.org/display/DW/Change+Management+Extensions (DistributeTraffic LCM and Use Case)

https://wiki.onap.org/display/DW/Change+Management+Dublin+Extensions (Distribute Traffic Workflow with Optimization Framework)

Test Scenario

../../../_images/dt-use-case.png

Figure 1 The idea of Traffic Distribution Use Case

The idea of the simplified scenario presented in Casablanca release is shown on Figure 1. In a result of the DistributeTraffic LCM action traffic flow originated from vPKG to vFW 1 and vSINK 1 is redirected to vFW 2 and vSINK 2 (as it is seen on Figure 2). Result of the change can be observed also on the vSINKs’ dashboards which show a current incoming traffic. Observation of the dashboard from vSINK 1 and vSINK 2 proves that API works properly.

../../../_images/dt-result.png

Figure 2 The result of traffic distribution

The purpose of the workj in Dublin release was to built a Traffic Distribution Workflow that takes as an input configuration parameters delivered by Optimization Framework and on their basis several LCM actions are executed in specific workflow.

../../../_images/dt-workflow.png

Figure 3 The Traffic Distribution Workflow

The prepared Traffic Distribution Workflow has following steps:

  • Workflow sends placement request to Optimization Framework (1) specific information about vPKG and vFW-SINK models and VNF-ID of vFW that we want to migrate traffic out from. Optimization Framework role is to find the vFW-SINK VNF/VF-module instance where traffic should be migrated to and vPKG which will be associated with this vFW. Altough in our case the calculation is very simple the mechanism is ready to work for service instances with VNF having houndreds of VF-odules spread accross different data centers.
  • Optimization Framework takes from the Policy Framework policies (2-3) for VNFs and for relations between each other (in our case there is checked ACTIVE status of vFW-SINK and vPKG VF-modules and the Region to which they belong)
  • Optimization Framework, base on the information from the polcies and service topology information taken from A&AI (4-11), offers traffc distribution anchor and destination canidates’ pairs (12-13) (pairs of VF-modules data with information about their V-Servers and their network interfaces). This information is returned to the workflow script (14).
  • Information from Optimization Framework can be used to construct APPC LCM requests for DistributeTrafficCheck and DistributeTraffic commands (15, 24, 33, 42). This information is used to fill CDT templates with proper data for further Ansible playbooks execution (17, 26, 35, 44)
  • In the first DistributeTrafficCheck LCM request on vPGN VNF/VF-Module APPC, over Ansible, checks if already configured destinatrion of vPKG packages is different than already configured. If not workflow is stopped (23).
  • Next, APPC performs the DistributeTraffic action like it is shown on Figure 1 and Figure 2 (25-31). If operation is completed properly traffic should be redirected to vFW 2 and vSINK 2 instance. If not, workflow is stopped (32).
  • Finally, APPC executes the DistributeTrafficCheck action on vFW 1 in order to verify that it does not receives any traffic anymore (34-40) and on vFW 2 in order to verify that it receives traffic forwrdd from vFW 2 (43-49)

Scenario Setup

In order to setup the scenario and to test the DistributeTraffic LCM API in action you need to perform the following steps:

  1. Create an instance of vFWDT (vPKG , 2 x vFW, 2 x vSINK) – dedicated for the DistributeTraffic LCM API tests
  2. Gather A&AI facts for Traffic Distribution use case configuration
  3. Install Traffic Distribution workflow packages
  4. Configure Optimization Framework for Traffic Distribution workflow
  5. Configure vPKG and vFW VNFs in APPC CDT tool
  6. Configure Ansible Server to work with vPKG and vFW VMs
  7. Execute Traffic Distribution Workflow

You will use the following ONAP K8s VMs or containers:

  • ONAP Rancher Server – workflow setup and its execution
  • APPC MariaDB container – setup Ansible adapter for vFWDT VNFs
  • APPC Ansible Server container – setup of Ansible Server, configuration of playbook and input parameters for LCM actions

Note

In all occurences <K8S-NODE-IP> constant is the IP address of any K8s Node of ONAP OOM installation which hosts ONAP pods i.e. k8s-node-1 and <K8S-RANCHER-IP> constant is the IP address of K8S Rancher Server

vFWDT Service Instantiation

In order to test a DistributeTraffic LCM API functionality a dedicated vFW instance must be prepared. It differs from a standard vFW instance by having an additional VF-module with a second instance of vFW and a second instance of vSINK. Thanks to that when a service instance is deployed there are already available two instances of vFW and vSINK that can be used for verification of DistributeTraffic LCM API – there is no need to use the ScaleOut function to test DistributeTraffic functionality what simplifies preparations for tests.

In order to instantiate vFWDT service please follow the procedure for standard vFW with following changes. You can create such service manually or you can use robot framework. For manual instantiation:

  1. Please use the following HEAT templates:

https://github.com/onap/demo/tree/master/heat/vFWDT

  1. Create Virtual Service in SDC with composition like it is shown on Figure 3
../../../_images/vfwdt-service.png

Figure 3 Composition of vFWDT Service

  1. Use the following payload files in the SDNC-Preload phase during the VF-Module instantiation

Note

Use publikc-key that is a pair for private key files used to log into ONAP OOM Rancher server. It will simplify further configuration

Note

vFWDT has a specific configuration of the networks – different than the one in original vFW use case (see Figure 4). Two networks must be created before the heat stack creation: onap-private network (10.0.0.0/16 typically) and onap-external-private (e.g. “10.100.0.0/16”). The latter one should be connected over a router to the external network that gives an access to VMs. Thanks to that VMs can have a floating IP from the external network assigned automatically in a time of stacks’ creation. Moreover, the vPKG heat stack must be created before the vFW/vSINK stacks (it means that the VF-module for vPKG must be created as a first one). The vPKG stack creates two networks for the vFWDT use case: protected and unprotected; so these networks must be present before the stacks for vFW/vSINK are created.

../../../_images/vfwdt-networks.png

Figure 4 Configuration of networks for vFWDT service

  1. Go to robot folder in Rancher server (being root user)

Go to the Rancher node and locate demo-k8s.sh script in oom/kubernetes/robot directory. This script will be used to run heatbridge procedure which will update A&AI information taken from OpenStack

  1. Run robot heatbridge in order to upload service topology information into A&AI
./demo-k8s.sh onap heatbridge <stack_name> <service_instance_id> <service> <oam-ip-address>

where:

  • <stack_name> - HEAT stack name from: OpenStack -> Orchestration -> Stacks
  • <service_instance_id> - is service_instance_id which you can get from VID or AAI REST API
  • <service> - in our case it should be vFWDT but may different (vFW, vFWCL) if you have assigned different service type in SDC
  • <oam-ip-address> - it is the name of HEAT input which stores ONAP management network name

Much easier way to create vFWDT service instance is to trigger it from the robot framework. Robot automates creation of service instance and it runs also heatbridge. To create vFWDT this way:

  1. Go to robot folder in Rancher server (being root user)

Go to the Rancher node and locate demo-k8s.sh script in oom/kubernetes/robot directory. This script will be used to run instantiate vFWDT service

  1. Run robot scripts for vFWDT instantiation
./demo-k8s.sh onap init
./ete-k8s.sh onap instantiateVFWDT

Note

You can verify the status of robot’s service instantiation process by going to http://<K8S-NODE-IP>:30209/logs/ (login/password: test/test)

After successful instantiation of vFWDT service go to the OpenStack dashboard and project which is configured for VNFs deployment and locate vFWDT VMs. Choose one and try to ssh into one them to proove that further ansible configuration action will be possible

ssh -i <rancher_private_key> ubuntu@<VM-IP>

Note

The same private key file is used to ssh into Rancher server and VMs created by ONAP

Preparation of Workflow Script Environment

  1. Enter over ssh Rancher server using root user
ssh -i <rancher_private_key> root@<K8S-RANCHER-IP>
  1. Clone onap/demo repository
git clone --single-branch --branch dublin "https://gerrit.onap.org/r/demo"
  1. Enter vFWDT tutorial directory
cd demo/tutorials/vFWDT
ls

which should show following folders

root@sb01-rancher:~/demo/tutorials/vFWDT# ls
playbooks  preloads  workflow

Note

Remeber vFWDT tutorial directory ~/demo/tutorials/vFWDT for further use

  1. Install python dependencies
sudo apt-get install python3-pip
pip3 install -r workflow/requirements.txt --user

Gathering Scenario Facts

In order to configure CDT tool for execution of Ansible playbooks and for execution of Traffic distribution workflow we need following A&AI facts for vFWDT service

  • vnf-id of generic-vnf vFW instance that we want to migrate traffic out from
  • vnf-type of vPKG VNF - required to configure CDT for Distribute Traffic LCMs
  • vnf-type of vFW-SINK VNFs - required to configure CDT for Distribute Traffic LCMs

Gathering facts from VID Portal

  1. Enter the VID portal
https://<K8S-NODE-IP>:30200/vid/welcome.htm
  1. In the left hand menu enter Search for Existing Service Instances
  2. Select proper subscriber from the list and press Submit button. When service instance of vFWDT Service Type appears Click on View/Edit link

Note

The name of the subscriber you can read from the robot logs if your have created vFWDT instance with robot. Otherwise this should be Demonstration subscriber

  1. For each VNF in vFWDT service instance note its vnf-id and vnf-type
../../../_images/vfwdt-vid-vpkg.png

Figure 5 vnf-type and vnf-id for vPKG VNF

../../../_images/vfwdt-vid-vnf-1.png

Figure 6 vnf-type and vnf-id for vFW-SINK 1 VNF

../../../_images/vfwdt-vid-vnf-2.png

Figure 7 vnf-type and vnf-id for vFW-SINK 2 VNF

Gathering facts directly from A&AI

  1. Enter OpenStack dashboard on whicvh vFWDT instance was created and got to Project->Compute->Instances and read VM names of vPKG VM and 2 vFW VMs created in vFWDT service instance
  2. Open Postman or any other REST client
  3. In Postman in General Settings disable SSL Certificate verification
  4. You can use also following Postman Collection for AAI AAI Postman Collection
  5. Alternatively create Collection and set its Authorization to Basic Auth type with login/password: AAI/AAI
  6. Create new GET query for tenants type with following link and read tenant-id value
https://<K8S-NODE-IP>:30233/aai/v14/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/RegionOne/tenants/

Note

CloudOwner and Region names are fixed for default setup of ONAP

  1. Create new GET query for vserver type with following link replacing <tenant-id> with value read before and <vm-name> with vPKG VM name read from OpenStack dashboard
https://<K8S-NODE-IP>:30233/aai/v14/cloud-infrastructure/cloud-regions/cloud-region/CloudOwner/RegionOne/tenants/tenant/<tenant-id>/vservers/?vserver-name=<vm-name>

Read from the response (realtionship with generic-vnf type) vnf-id of vPKG VNF

Note

If you do not receive any vserver candidate it means that heatbridge procedure was not performed or was not completed successfuly. It is mandatory to continue this tutorial

  1. Create new GET query for generic-vnf type with following link replacing <vnf-id> with value read from previous GET response
https://<K8S-NODE-IP>:30233/aai/v14/network/generic-vnfs/generic-vnf/<vnf-id>
  1. Repeat this procedure also for 2 vFW VMs and note their vnf-type and vnf-id

Configuration of ONAP Environment

This sections show the steps necessary to configure CDT and Ansible server what is required for execution of APPC LCM actions in the workflow script

Testing Gathered Facts on Workflow Script

Having collected vnf-id and vnf-type parameters we can execute Traffic Distribution Workflow Python script. It works in two modes. First one executes ony initial phase where AAI and OOF is used to collect neccessary information for configuration of APPC and for further execution phase. The second mode performs also second phase which executes APPC LCM actions.

At this stage we will execute script in the initial mode to generate some configuration helpful in CDT and Ansible configuration.

  1. Enter vFWDT tutorial directory on Rancher server (already created in Preparation of Workflow Script Environment) and execute there workflow script with follwoing parameters
python3 workflow.py <VNF-ID> <K8S-NODE-IP> True False True True

For now and for further use workflow script has following input parameters:

  • vnf-id of vFW VNF instance that traffic should be migrated out from
  • IP of ONAP OOM Node
  • if script should use and build OOF response cache (cache it speed-ups further executions of script)
  • if instead of vFWDT service instance vFW or vFWCL one is used (should be False always)
  • if only configuration information will be collected (True for initial phase and False for full execution of workflow)
  • if APPC LCM action status should be verified and FAILURE should stop workflow (when False FAILED status of LCM action does not stop execution of further LCM actions)
  1. The script at this stage should give simmilar output
Executing workflow for VNF ID '909d396b-4d99-4c6a-a59b-abe948873303' on ONAP with IP 10.12.5.63

OOF Cache True, is CL vFW False, only info False, check LCM result True

vFWDT Service Information:
{
    "vf-module-id": "0dce0e61-9309-449a-8e3e-f001635aaab1",
    "service-info": {
        "global-customer-id": "DemoCust_ccc04407-1740-4359-b3c4-51bbcb62d9f6",
        "service-type": "vFWDT",
        "service-instance-id": "ab37d391-95c6-4844-b7c3-23d111bfa2ce"
    },
    "vfw-model-info": {
        "model-version-id": "f7fc17ba-48b9-456b-acc1-f89f31eda8cc",
        "vnf-type": "vFWDT 2019-05-20 21:10:/vFWDT_vFWSNK b463aa83-b1fc 0",
        "model-invariant-id": "0dfe8d6d-21c1-42f6-867a-1867cebb7751",
        "vnf-name": "Ete_vFWDTvFWSNK_ccc04407_1"
    },
    "vpgn-model-info": {
        "model-version-id": "0f8a2467-af44-4d7c-ac55-a346dcad9e0e",
        "vnf-type": "vFWDT 2019-05-20 21:10:/vFWDT_vPKG a646a255-9bee 0",
        "model-invariant-id": "75e5ec48-f43e-40d2-9877-867cf182e3d0",
        "vnf-name": "Ete_vFWDTvPKG_ccc04407_0"
    }
}

Ansible Inventory:
[vpgn]
vofwl01pgn4407 ansible_ssh_host=10.0.210.103 ansible_ssh_user=ubuntu
[vfw-sink]
vofwl01vfw4407 ansible_ssh_host=10.0.110.1 ansible_ssh_user=ubuntu
vofwl02vfw4407 ansible_ssh_host=10.0.110.4 ansible_ssh_user=ubuntu

The result should have almoast the same information for vnf-id’s of both vFW VNFs. vnf-type for vPKG and vFW VNFs should be the same like those collected in previous steps. Ansible Inventory section contains information about the content Ansible Inventor file that will be configured later on Configuration of Ansible Server

Configuration of VNF in the APPC CDT tool

Following steps aim to configure DistributeTraffic LCM action for our vPKG and vFW-SINK VNFs in APPC CDT tool.

  1. Enter the Controller Design Tool portal
https://<K8S-NODE-IP>:30289/index.html
  1. Click on MY VNFS button and login to CDT portal giving i.e. demo user name
  2. Click on the CREATE NEW VNF TYPE button
../../../_images/vfwdt-create-vnf-type.png

Figure 8 Creation of new VNF type in CDT

  1. Enter previously retrieved VNF Type for vPKG VNF and press the NEXT button
../../../_images/vfwdt-enter-vnf-type.png

Figure 9 Creation of new VNF type in CDT

  1. For already created VNF Type (if the view does not open itself) click the View/Edit button. In the LCM action edit view in the first tab please choose:
  • DistributeTraffic as Action name
  • ANSIBLE as Device Protocol
  • Y value in Template dropdown menu
  • admin as User Name
  • 8000 as Port Number
../../../_images/vfwdt-new-lcm-ref-data.png

Figure 10 DistributeTraffic LCM action editing

  1. Go to the Template tab and in the editor paste the request template of the DistributeTraffic LCM action for vPKG VNF type
{
    "InventoryNames": "VM",
    "PlaybookName": "${()=(book_name)}",
    "NodeList": [{
        "vm-info": [{
            "ne_id": "${()=(ne_id)}",
            "fixed_ip_address": "${()=(fixed_ip_address)}"
        }],
        "site": "site",
        "vnfc-type": "vpgn"
    }],
    "EnvParameters": {
        "ConfigFileName": "../traffic_distribution_config.json",
        "vnf_instance": "vfwdt",
    },
    "FileParameters": {
        "traffic_distribution_config.json": "${()=(file_parameter_content)}"
    },
    "Timeout": 3600
}

Note

For all this VNF types and for all actions CDT template is the same except vnfc-type parameter that for vPKG VNF type should have value vpgn and for vFW-SINK VNF type should have value vfw-sink

The meaning of selected template parameters is following:

  • EnvParameters group contains all the parameters that will be passed directly to the Ansible playbook during the request’s execution. vnf_instance is an obligatory parameter for VNF Ansible LCMs. In our case for simplification it has predefined value
  • InventoryNames parameter is obligatory if you want to have NodeList with limited VMs or VNFCs that playbook should be executed on. It can have value VM or VNFC. In our case VM valuye means that NodeList will have information about VMs on which playbook should be executed. In this use case this is always only one VM
  • NodeList parameter value must match the group of VMs like it was specified in the Ansible inventory file. PlaybookName must be the same as the name of playbook that was uploaded before to the Ansible server.
  • FileParameters
../../../_images/vfwdt-create-template.png

Figure 11 LCM DistributeTraffic request template

  1. Afterwards press the SYNCHRONIZE WITH TEMPLATE PARAMETERS button. You will be moved to the Parameter Definition tab. The new parameters will be listed there.
../../../_images/vfwdt-template-parameters.png

Figure 12 Summary of parameters specified for DistributeTraffic LCM action.

Note

For each parameter you can define its: mandatory presence; default value; source (Manual/A&AI). For our case modification of this settings is not necessary

  1. Finally, go back to the Reference Data tab and click SAVE ALL TO APPC.

Note

Remember to configure DistributeTraffic and DistributeTrafficCheck actions for vPKG VNF type and DistributeTrafficCheck action for vFW-SINK

Configuration of Ansible Server

After an instantiation of the vFWDT service the Ansible server must be configured in order to allow it a reconfiguration of vPKG VM.

  1. Copy from Rancher server private key file used for vFWDT VMs’ creation and used for access to Rancher server into the /opt/ansible-server/Playbooks/onap.pem file
sudo kubectl cp <path/to/file>/onap.pem onap/`kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep appc-ansible`:/opt/ansible-server/Playbooks/

Note

The private key file must be the same like configured at this stage vFWDT Service Instantiation

  1. Enter the Rancher server and then enter the APPC Ansible server container
kubectl exec -it -n onap `kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep appc-ansible` -- sh
  1. Give the private key file a proper access rights
cd /opt/ansible-server/Playbooks/
chmod 400 onap.pem
chown ansible:ansible onap.pem
  1. Edit the /opt/ansible-server/Playbooks/Ansible_inventory file including all the hosts of vFWDT service instance used in this use case. The content of the file is generated by workflow script Testing Gathered Facts on Workflow Script
[vpgn]
vofwl01pgn4407 ansible_ssh_host=10.0.210.103 ansible_ssh_user=ubuntu
[vfw-sink]
vofwl01vfw4407 ansible_ssh_host=10.0.110.1 ansible_ssh_user=ubuntu
vofwl02vfw4407 ansible_ssh_host=10.0.110.4 ansible_ssh_user=ubuntu

Note

Names of hosts and their IP addresses will be different. The names of the host groups are the same like ‘vnfc-type’ attributes configured in the CDT templates

  1. Configure the default private key file used by Ansible server to access hosts over ssh
vi /etc/ansible/ansible.cfg
[defaults]
host_key_checking = False
private_key_file = /opt/ansible-server/Playbooks/onap.pem

Note

This is the default privaye key file. In the /opt/ansible-server/Playbooks/Ansible_inventory different key could be configured but APPC in time of execution of playbbok on Ansible server creates its own dedicated inventory file which does not have private key file specified. In consequence, this key file configured is mandatory for proper execution of playbooks by APPC

  1. Test that the Ansible server can access over ssh vFWDT hosts configured in the ansible inventory
ansible –i Ansible_inventory vpgn,vfw-sink –m ping
  1. Download the distribute traffic playbook into the /opt/ansible-server/Playbooks directory

Exit Ansible server pod and enter vFWDT tutorial directory Preparation of Workflow Script Environment on Rancher server. Afterwards, copy playbooks into Ansible server pod

sudo kubectl cp playbooks/vfw-sink onap/`kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep appc-ansible`:/opt/ansible-server/Playbooks/
sudo kubectl cp playbooks/vpgn onap/`kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep appc-ansible`:/opt/ansible-server/Playbooks/
  1. After the configuration of Ansible serverthe structure of /opt/ansible-server/Playbooks directory should be following
/opt/ansible-server/Playbooks $ ls -R
.:
Ansible_inventory  onap.pem           vfw-sink           vpgn

./vfw-sink:
latest

./vfw-sink/latest:
ansible

./vfw-sink/latest/ansible:
distributetrafficcheck

./vfw-sink/latest/ansible/distributetrafficcheck:
site.yml

./vpgn:
latest

./vpgn/latest:
ansible

./vpgn/latest/ansible:
distributetraffic       distributetrafficcheck

./vpgn/latest/ansible/distributetraffic:
site.yml

./vpgn/latest/ansible/distributetrafficcheck:
site.yml

Configuration of APPC DB for Ansible

For each VNF that uses the Ansible protocol you need to configure PASSWORD and URL field in the DEVICE_AUTHENTICATION table. This step must be performed after configuration in CDT which populates data in DEVICE_AUTHENTICATION table.

  1. Enter the APPC DB container
kubectl exec -it -n onap `kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep appc-db-0` -- sh
  1. Enter the APPC DB CLI (password is gamma)
mysql -u sdnctl -p
  1. Execute the following SQL commands
MariaDB [(none)]> use sdnctl;
MariaDB [sdnctl]> UPDATE DEVICE_AUTHENTICATION SET URL = 'http://appc-ansible-server:8000/Dispatch' WHERE ACTION LIKE 'DistributeTraffic%';
MariaDB [sdnctl]> UPDATE DEVICE_AUTHENTICATION SET PASSWORD = 'admin' WHERE ACTION LIKE 'DistributeTraffic%';
MariaDB [sdnctl]> select * from DEVICE_AUTHENTICATION;

Result should be simmilar to the following one:

+--------------------------+------------------------------------------------------+----------+------------------------+-----------+----------+-------------+------------------------------------------+
| DEVICE_AUTHENTICATION_ID | VNF_TYPE                                             | PROTOCOL | ACTION                 | USER_NAME | PASSWORD | PORT_NUMBER | URL                                      |
+--------------------------+------------------------------------------------------+----------+------------------------+-----------+----------+-------------+------------------------------------------+
|                      137 | vFWDT 2019-05-20 21:10:/vFWDT_vPKG a646a255-9bee 0   | ANSIBLE  | DistributeTraffic      | admin     | admin    |        8000 | http://appc-ansible-server:8000/Dispatch |
|                      143 | vFWDT 2019-05-20 21:10:/vFWDT_vFWSNK b463aa83-b1fc 0 | ANSIBLE  | DistributeTraffic      | admin     | admin    |        8000 | http://appc-ansible-server:8000/Dispatch |
|                      149 | vFWDT 2019-05-20 21:10:/vFWDT_vFWSNK b463aa83-b1fc 0 | ANSIBLE  | DistributeTrafficCheck | admin     | admin    |        8000 | http://appc-ansible-server:8000/Dispatch |
|                      152 | vFWDT 2019-05-20 21:10:/vFWDT_vPKG a646a255-9bee 0   | ANSIBLE  | DistributeTrafficCheck | admin     | admin    |        8000 | http://appc-ansible-server:8000/Dispatch |
+--------------------------+------------------------------------------------------+----------+------------------------+-----------+----------+-------------+------------------------------------------+
4 rows in set (0.00 sec)

Testing Traffic Distribution Workflow

Since all the configuration of components of ONAP is already prepared it is possible to enter second phase of Traffic Distribution Workflow execution - the execution of DistributeTraffic and DistributeTrafficCheck LCM actions with configuration resolved before by OptimizationFramework.

Workflow Execution

In order to run Traffic Distribution Workflow execute following commands from the vFWDT tutorial directory Preparation of Workflow Script Environment on Rancher server.

cd workflow
python3 workflow.py 909d396b-4d99-4c6a-a59b-abe948873303 10.12.5.63 True False False True

The order of executed LCM actions is following:

  1. DistributeTrafficCheck on vPKG VM - ansible playbook checks if traffic destinations specified by OOF is not configued in the vPKG and traffic does not go from vPKG already. If vPKG send alreadyt traffic to destination the playbook will fail and workflow will break.

  2. DistributeTraffic on vPKG VM - ansible playbook reconfigures vPKG in order to send traffic to destination specified before by OOF. When everything is fine at this stage change of the traffic should be observed on following dashboards (please turn on automatic reload of graphs)

    http://<vSINK-1-IP>:667/
    http://<vSINK-2-IP>:667/
    
  3. DistributeTrafficCheck on vFW-1 VM - ansible playbook checks if traffic is not present on vFW from which traffic should be migrated out. If traffic is still present after 30 seconds playbook fails

  4. DistributeTrafficCheck on vFW-2 VM - ansible playbook checks if traffic is present on vFW from which traffic should be migrated out. If traffic is still not present after 30 seconds playbook fails

Workflow Results

Expected result of workflow execution, when everythin is fine, is following:

Distribute Traffic Workflow Execution:
APPC REQ 0 - DistributeTrafficCheck
Request Accepted. Receiving result status...
Checking LCM DistributeTrafficCheck Status
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
SUCCESSFUL
APPC REQ 1 - DistributeTraffic
Request Accepted. Receiving result status...
Checking LCM DistributeTraffic Status
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
SUCCESSFUL
APPC REQ 2 - DistributeTrafficCheck
Request Accepted. Receiving result status...
Checking LCM DistributeTrafficCheck Status
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
SUCCESSFUL
APPC REQ 3 - DistributeTrafficCheck
Request Accepted. Receiving result status...
Checking LCM DistributeTrafficCheck Status
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
SUCCESSFUL

In case of failure the result can be following:

Distribute Traffic Workflow Execution:
APPC REQ 0 - DistributeTrafficCheck
Request Accepted. Receiving result status...
Checking LCM DistributeTrafficCheck Status
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
IN_PROGRESS
FAILED
Traceback (most recent call last):
File "workflow.py", line 563, in <module>
    sys.argv[5].lower() == 'true', sys.argv[6].lower() == 'true')
File "workflow.py", line 557, in execute_workflow
    confirm_appc_lcm_action(onap_ip, req, check_result)
File "workflow.py", line 529, in confirm_appc_lcm_action
    raise Exception("LCM {} {} - {}".format(req['input']['action'], status['status'], status['status-reason']))
Exception: LCM DistributeTrafficCheck FAILED - FAILED

Note

When CDT and Ansible is configured properly Traffic Distribution Workflow can fail when you pass as a vnf-id argument the ID of vFW VNF which does not handle traffic at the moment. To solve that pass the VNF ID of the other vFW VNF instance. Because of the same reason you cannot execute twice in a row workflow for the same VNF ID if first execution succedds.