Example Slack Notification for Pods in crashloopbackoff

Example: Slack Notification for Pods in Crashloopbackoff

The below HealthCheck and ClusterhealthCheck YAML definitions can be used to instruct Sveltos to:

1. Detect pods in a crashloopbackoff state for every cluster that matched the labels __env=fv```
2. Send a Slack notification when an event is detected

---
apiVersion: lib.projectsveltos.io/v1beta1
kind: HealthCheck
metadata:
  name: crashing-pod
spec:
  resourceSelectors:
  - group: ""
    version: v1
    kind: Pod
  evaluateHealth: |
    function evaluate()
      local statuses = {}

      for _,resource in ipairs(resources) do
        ignore = true
        if resource.status.containerStatuses then
          local containerStatuses = resource.status.containerStatuses
          for _, containerStatus in ipairs(containerStatuses) do
            if containerStatus.state.waiting and containerStatus.state.waiting.reason == "CrashLoopBackOff" then
              ignore = false
              status = "Degraded"
              message = resource.metadata.namespace .. "/" .. resource.metadata.name .. ":" .. containerStatus.state.waiting.message
              if containerStatus.lastState.terminated and containerStatus.lastState.terminated.reason then
                message = message .. "\nreason:" .. containerStatus.lastState.terminated.reason
              end
            end
          end
          if not ignore then
            table.insert(statuses, {resource=resource, status = status, message = message})
          end
        end
      end

      local hs = {}
      if #statuses > 0 then
        hs.resources = statuses 
      end
      return hs
    end        

---
apiVersion: lib.projectsveltos.io/v1beta1
kind: ClusterHealthCheck
metadata:
name: crashing-pod
spec:
clusterSelector:
  matchLabels:
    env: fv
livenessChecks:
- name: crashing-pod
  type: HealthCheck
  livenessSourceRef:
    kind: HealthCheck
    apiVersion: lib.projectsveltos.io/v1beta1
    name: crashing-pod
notifications:
- name: slack
  type: Slack
  notificationRef:
    apiVersion: v1
    kind: Secret
    name: slack
    namespace: default

Tip

The YAML defintions can be found here.