Add "imagePullPolicy" parameter in Kubernetes container

The configuration parameter "imagePullPolicy" defines how Kubernetes
retrieves de image. By default, Kubernetes will always try to pull the
latest image from the repository [1]. Three possible arguments are accepted:
  - Always
  - IfNotPresent
  - Never

Example of Kubernetes pod definition:
  containers:
    - name: vcmts-pktgen-pod-0
      image: openretriever/yardstick
      imagePullPolicy: IfNotPresent

Example of Yardstick definition:
  context:
    name: k8syardstick
    type: Kubernetesservers:
    vnf:
      image: openretriever/yardstick
      imagePullPolicy: IfNotPresent

[1] https://kubernetes.io/docs/concepts/containers/images/

JIRA: YARDSTICK-1328

Change-Id: I83bfb01670eef22218b1affd7d37af14e32a622e
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/yardstick/common/exceptions.py b/yardstick/common/exceptions.py
index c25acbaf8..51db552ee 100644
--- a/yardstick/common/exceptions.py
+++ b/yardstick/common/exceptions.py
@@ -253,6 +253,10 @@ class KubernetesContainerPortNotDefined(YardstickException):
     message = 'Container port not defined in "%(port)s"'
 
 
+class KubernetesContainerWrongImagePullPolicy(YardstickException):
+    message = 'Image pull policy must be "Always", "IfNotPresent" or "Never"'
+
+
 class ScenarioCreateNetworkError(YardstickException):
     message = 'Create Neutron Network Scenario failed'