how to fix "Error from server (BadRequest): container "nodeapp" in pod "nodeapp" is waiting to start: trying and failing to pull image"?

 if you try to run the image from AKR(Azure Kubernetes Registry) with the following command in the Azure CLI

 kubectl run nodeapp \

  --image=mydanaksacr.azurecr.io/node:v1 \

  --port=8080

the output indicate that the pod was create. however when you check the pod. the result is below

danny@Azure:~/clouddrive$ kubectl get pods

NAME      READY   STATUS         RESTARTS   AGE

nodeapp   0/1     ErrImagePull   0          36s

after I check the log with kubectl logs on the pod 

danny@Azure:~/clouddrive$ kubectl logs nodeapp

Error from server (BadRequest): container "nodeapp" in pod "nodeapp" is waiting to start: image can't be pulled

the message indicates that the service principal does not have the right to pull the image from AKR

here is the solution to solve the issue. run the following command in the cli to grant the service principal to the acrpull role.

az role assignment create --assignee "<<service principal ID>>" --role acrpull --scope "<<AKR resource ID>>"

this is the specific example running in the development environment

 az role assignment create --assignee "34d6880e-bc51-416f-b250-b87904390d0c" --role acrpull --scope "/subscriptions/3f2c3687-9d93-45be-a8e0-b8ca6e4f5944/resourceGroups/MyResourceGroup/providers/Microsoft.ContainerRegistry/registries/myDanAksAcr"

how to fix " ReferenceError: fetch is not defined" in redux testing with nock and jest?

when i implemented a test a case against the API call to test the reducer, we can use NOCK to mock the API with JEST test run.

here is the sample code for the above test case.

import { createStore, applyMiddleware } from 'redux'

import thunk from 'redux-thunk'

import nock from 'nock'

import { fetchUser } from '../../src/actions'

import usersReducer from '../../src/reducers/users'

// global.fetch = require('node-fetch');

const middlewares = [ thunk ]

let store

beforeEach(() => {

  store = createStore(usersReducer, applyMiddleware(thunk))

})

afterEach(() => {

  nock.cleanAll()

})

test('initial state should be empty array (no users)', () => {

  expect(store.getState()).toEqual([])

})

test('fetchUser action should add user object to state', () => {

  const username = 'dan'

  const realname = 'Dan Deng'

  const userObj = { username:username, realname:realname }

  console.log(userObj)

  nock('http://localhost:8080/')

    .get(`/api/users/${username}`)

    .reply(200, userObj)

  expect.assertions(1)

  const action = fetchUser(username)

  return store.dispatch(action)

    .then(() =>

      expect(store.getState()).toContainEqual(userObj)

    )

})

however i ran the test case with JEST, the following error came immediately. since i use fetch function from fetch-node module.

 ● fetchUser action should add user object to state

    ReferenceError: fetch is not defined

      23 |     types:[FETCH_USER_REQUEST, FETCH_USER_SUCCESS, FETCH_USER_FAILURE],
      24 |     promise: fetch(`http://localhost:8080/api/users/${username}`)
    > 25 |     .then(response=>response.json())
         |      ^
      26 | })
      27 |
      28 | export const createUser=(username, realname, password)=>thunkCreator({

      at fetchUser (src/actions/users.js:25:6)
      at Object.<anonymous> (_test_/reducers/users.test.js:88:18)

  ● fetchUser action should add user object to state

    expect.assertions(1)

    Expected one assertion to be called but received zero assertion calls.

      84 |     .reply(200, userObj)
      85 |
    > 86 |   expect.assertions(1)
         |          ^
      87 |
      88 |   const action = fetchUser(username)
      89 |   return store.dispatch(action)

      at Object.<anonymous> (_test_/reducers/users.test.js:86:10)

the fix is very easy, we just have to add the reference to fetch in the test file. the test case was passed and succeed.

 global.fetch = require('node-fetch');