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      "body": "Congratulations @andy2046! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@andy2046/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@andy2046) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=andy2046)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "title": "[React] Redux 源码解读",
      "body": "![redux](https://user-images.githubusercontent.com/2193706/36338194-8c1a5dca-13e3-11e8-85c0-d45c030a9de8.jpg)\n\n---\n\n![redux](https://user-images.githubusercontent.com/2193706/36338195-96d490be-13e3-11e8-9a95-e18fba4e3c71.png)\n---\n\n# 介绍\n我们一起来研究下当前最流行的**React状态管理容器Redux**，本文基于**Redux v3.7.2** ，Redux用一个单独的状态树对象（state tree object）保存整个应用的状态，这个对象不能直接被改变（immutable），当数据变化了，一个新的对象就会被创建（通过actions和reducers）\n\nRedux有如下优点：\n- 可预测\n始终有一个唯一的准确的数据源（single source of truth），就是store，通过actions和reducers来保证整个应用状态同步，做到绝不混乱\n- 易维护\n具备可预测的结果和严格的组织结构让代码更容易维护\n- 易测试\n编写可测试代码的首要准则是编写可以仅做一件事并且独立的小函数（single responsibility principle），Redux的代码几乎全部都是这样的函数：短小·纯粹·分离\n\n# 实例代码\n举个小栗子🌰看看应用代码中如何使用Redux\n例子取自Redux examples 里面的counter\n```js\nimport React           from 'react'\nimport ReactDOM        from 'react-dom'\nimport { createStore } from 'redux'\nimport Counter         from './components/Counter'\n// import counter      from './reducers'\nconst counter = (state = 0, action) => {\n  switch (action.type) {\n    case 'INCREMENT':\n      return state + 1\n    case 'DECREMENT':\n      return state - 1\n    default:\n      return state\n  }\n}\n\nconst store = createStore(counter)\nconst rootEl = document.getElementById('root')\n\nconst render = () => ReactDOM.render(\n  <Counter\n    value={store.getState()}\n    onIncrement={() => store.dispatch({ type: 'INCREMENT' })}\n    onDecrement={() => store.dispatch({ type: 'DECREMENT' })}\n  />,\n  rootEl\n)\n\nrender()\nstore.subscribe(render)\n```\n\n# 整体结构\n![screen shot 2018-02-17 at 12 48 20 pm](https://user-images.githubusercontent.com/2193706/36338320-b8a938fe-13e6-11e8-9f2b-5fad07d431d5.png)\n\n## utils/warning.js\nutils目录下面的warning.js负责控制台错误日志的输出，用于非生产环境下（`process.env.NODE_ENV !== 'production'`）抛出错误便于debug：\n```js\nexport default function warning(message) {\n  if (typeof console !== 'undefined' && typeof console.error === 'function') {\n    console.error(message)\n  }\n  try {\n    // This error was thrown as a convenience so that if you enable\n    // \"break on all exceptions\" in your console,\n    // it would pause the execution at this line.\n    throw new Error(message)\n  } catch (e) { }\n}\n```\n\n## index.js\n入口文件index.js主要用于引出公共方法API供外面调用，isCrushed那段用于非生产环境\n```js\nimport createStore from './createStore'\nimport combineReducers from './combineReducers'\nimport bindActionCreators from './bindActionCreators'\nimport applyMiddleware from './applyMiddleware'\nimport compose from './compose'\nimport warning from './utils/warning'\n\nfunction isCrushed() {}\n\nif (\n  process.env.NODE_ENV !== 'production' &&\n  typeof isCrushed.name === 'string' &&\n  isCrushed.name !== 'isCrushed'\n) {\n  warning(\n    'You are currently using minified code outside of NODE_ENV === \\'production\\'. ' +\n    'This means that you are running a slower development build of Redux. ' +\n    'You can use loose-envify (https://github.com/zertosh/loose-envify) for browserify ' +\n    'or DefinePlugin for webpack (http://stackoverflow.com/questions/30030031) ' +\n    'to ensure you have the correct code for your production build.'\n  )\n}\n\nexport {\n  createStore,\n  combineReducers,\n  bindActionCreators,\n  applyMiddleware,\n  compose\n}\n```\n\n## createStore.js\ncreateStore.js用于Store的生成，接受3个参数：\n- reducer函数，接受当前state tree和一个action，返回新的state tree\n- preloadedState，初始状态树，如果你使用`combineReducers`，必须确保初始state tree object的keys和`combineReducers`的keys保持一致\n- enhancer，用来强化store，比如middleware ／ time travel，Redux自带的唯一enhancer是`applyMiddleware()`\n\n#### getState()\n用来返回当前state tree\n#### replaceReducer(nextReducer)\n用来替换掉当前store用的reducer，可用于动态按需加载或者热替换等场景\n\n#### subscribe(listener)\n订阅函数，用来注册监听事件，并返回取消订阅的函数\n每当dispatch一个action时注册的listener被调用，为实现实时性，监听函数listener加入到nextListeners数组中，而dispatch事件使用currentListeners数组\n\n#### dispatch(action)\n用来分发action修改state tree的唯一方式，action必须是plain object并带有type属性\n- 将当前state tree和action传入Reducer，返回的新的state tree用于更新当前state tree\n- 按顺序调用currentListeners数组中的listener\n- 返回action\n\n#### observable()\n用于与`observable/reactive lib`互操作，当dispatch一个action时，调用注册的observer的next方法\n\n```js\nimport isPlainObject from 'lodash/isPlainObject'\nimport $$observable from 'symbol-observable'\n\nexport const ActionTypes = {\n  INIT: '@@redux/INIT'\n}\n\nexport default function createStore(reducer, preloadedState, enhancer) {\n  if (typeof preloadedState === 'function' && typeof enhancer === 'undefined') {\n    enhancer = preloadedState\n    preloadedState = undefined\n  }\n  if (typeof enhancer !== 'undefined') {\n    if (typeof enhancer !== 'function') {\n      throw new Error('Expected the enhancer to be a function.')\n    }\n    return enhancer(createStore)(reducer, preloadedState)\n  }\n  if (typeof reducer !== 'function') {\n    throw new Error('Expected the reducer to be a function.')\n  }\n\n  let currentReducer = reducer\n  let currentState = preloadedState\n  let currentListeners = []\n  let nextListeners = currentListeners\n  let isDispatching = false\n\n  function ensureCanMutateNextListeners() {\n    if (nextListeners === currentListeners) {\n      nextListeners = currentListeners.slice()\n    }\n  }\n\n  function getState() {\n    return currentState\n  }\n\n  function subscribe(listener) {\n    if (typeof listener !== 'function') {\n      throw new Error('Expected listener to be a function.')\n    }\n    let isSubscribed = true\n    ensureCanMutateNextListeners()\n    nextListeners.push(listener)\n    return function unsubscribe() {\n      if (!isSubscribed) {\n        return\n      }\n      isSubscribed = false\n      ensureCanMutateNextListeners()\n      const index = nextListeners.indexOf(listener)\n      nextListeners.splice(index, 1)\n    }\n  }\n\n  function dispatch(action) {\n    if (!isPlainObject(action)) {\n      throw new Error(\n        'Actions must be plain objects. ' +\n        'Use custom middleware for async actions.'\n      )\n    }\n    if (typeof action.type === 'undefined') {\n      throw new Error(\n        'Actions may not have an undefined \"type\" property. ' +\n        'Have you misspelled a constant?'\n      )\n    }\n    if (isDispatching) {\n      throw new Error('Reducers may not dispatch actions.')\n    }\n    try {\n      isDispatching = true\n      currentState = currentReducer(currentState, action)\n    } finally {\n      isDispatching = false\n    }\n    const listeners = currentListeners = nextListeners\n    for (let i = 0; i < listeners.length; i++) {\n      const listener = listeners[i]\n      listener()\n    }\n    return action\n  }\n\n  function replaceReducer(nextReducer) {\n    if (typeof nextReducer !== 'function') {\n      throw new Error('Expected the nextReducer to be a function.')\n    }\n    currentReducer = nextReducer\n    dispatch({ type: ActionTypes.INIT })\n  }\n\n  function observable() {\n    const outerSubscribe = subscribe\n    return {\n      subscribe(observer) {\n        if (typeof observer !== 'object') {\n          throw new TypeError('Expected the observer to be an object.')\n        }\n        function observeState() {\n          if (observer.next) {\n            observer.next(getState())\n          }\n        }\n        observeState()\n        const unsubscribe = outerSubscribe(observeState)\n        return { unsubscribe }\n      },\n      [$$observable]() {\n        return this\n      }\n    }\n  }\n\n  dispatch({ type: ActionTypes.INIT })\n\n  return {\n    dispatch,\n    subscribe,\n    getState,\n    replaceReducer,\n    [$$observable]: observable\n  }\n}\n```\n\n## bindActionCreators.js\n将action creators转换成具有同名keys的对象，用dispatch把每个action creator包起来，这样就可以直接调用它们，将包好的action creator往下传到一个组件上，却不让这个组件觉察到Redux的存在，松耦合\n```js\nfunction bindActionCreator(actionCreator, dispatch) {\n  return (...args) => dispatch(actionCreator(...args))\n}\n\nexport default function bindActionCreators(actionCreators, dispatch) {\n  if (typeof actionCreators === 'function') {\n    return bindActionCreator(actionCreators, dispatch)\n  }\n\n  if (typeof actionCreators !== 'object' || actionCreators === null) {\n    throw new Error(\n      `bindActionCreators expected an object or a function, instead received ${actionCreators === null ? 'null' : typeof actionCreators}. ` +\n      `Did you write \"import ActionCreators from\" instead of \"import * as ActionCreators from\"?`\n    )\n  }\n\n  const keys = Object.keys(actionCreators)\n  const boundActionCreators = {}\n  for (let i = 0; i < keys.length; i++) {\n    const key = keys[i]\n    const actionCreator = actionCreators[key]\n    if (typeof actionCreator === 'function') {\n      boundActionCreators[key] = bindActionCreator(actionCreator, dispatch)\n    }\n  }\n  return boundActionCreators\n}\n```\n\n## combineReducers.js\n用来合并Reducers，将多个Reducer函数构成的对象转换为单个Reducer函数，当应用较大时Reducers可以按照模块拆分（domain model && SRP），代码结构比较清晰，它会调用每个子Reducer，并收集结果组成一个单一的state tree object，其keys与传递的子Reducer的keys相对应\n对每一个Reducer，其初始state不可以为undefined，但可以为null，对传入的action，如果action为undefined，应该返回初始state，如果是未知的action，应该返回当前state\n```js\nexport default function combineReducers(reducers) {\n  const reducerKeys = Object.keys(reducers)\n  const finalReducers = {}\n  for (let i = 0; i < reducerKeys.length; i++) {\n    const key = reducerKeys[i]\n    if (typeof reducers[key] === 'function') {\n      finalReducers[key] = reducers[key]\n    }\n  }\n  const finalReducerKeys = Object.keys(finalReducers)\n  let shapeAssertionError\n  try {\n    assertReducerShape(finalReducers)\n  } catch (e) {\n    shapeAssertionError = e\n  }\n\n  return function combination(state = {}, action) {\n    if (shapeAssertionError) {\n      throw shapeAssertionError\n    }\n    let hasChanged = false\n    const nextState = {}\n    for (let i = 0; i < finalReducerKeys.length; i++) {\n      const key = finalReducerKeys[i]\n      const reducer = finalReducers[key]\n      const previousStateForKey = state[key]\n      const nextStateForKey = reducer(previousStateForKey, action)\n      if (typeof nextStateForKey === 'undefined') {\n        const errorMessage = getUndefinedStateErrorMessage(key, action)\n        throw new Error(errorMessage)\n      }\n      nextState[key] = nextStateForKey\n      hasChanged = hasChanged || nextStateForKey !== previousStateForKey\n    }\n    return hasChanged ? nextState : state\n  }\n}\n```\n\n## compose.js\n用来组合传入的多个函数，在中间件时会用到，最终结果是把各个函数从右至左串联起来，相当于：\n`compose(a,b) = (...args) => a(b(...args))`\n```js\nexport default function compose(...funcs) {\n  if (funcs.length === 0) {\n    return arg => arg\n  }\n  if (funcs.length === 1) {\n    return funcs[0]\n  }\n  return funcs.reduce((a, b) => (...args) => a(b(...args)))\n}\n```\n\n## applyMiddleware.js\n用于强化Store\n上面👆分析createStore.js我们知道，中间件可以作为createStore的第二个或者第三个参数传入，如果有中间件，执行结果相当于`applyMiddleware(…middlewares)(createStore)(reducer, preloadedState)`\n\n```js\nconst store = createStore(reducer,applyMiddleware(…middlewares))\n// or\nconst store = createStore(reducer,{},applyMiddleware(…middlewares))\n\nexport default function createStore(reducer, preloadedState, enhancer) {\n  if (typeof preloadedState === 'function' && typeof enhancer === 'undefined') {\n    enhancer = preloadedState\n    preloadedState = undefined\n  }\n\n  if (typeof enhancer !== 'undefined') {\n    if (typeof enhancer !== 'function') {\n      throw new Error('Expected the enhancer to be a function.')\n    }\n\n    return enhancer(createStore)(reducer, preloadedState)\n  }\n}\n```\n从下面👇的代码可以看到，相当于用compose把各个middleware串联起来，传入dispatch得到更新的dispatch\n为了串联所有middleware，其接受三层参数，第一层是Store，第二层是下一个middleware，第三层才是action，代码如下：\n```js\nexport function middleware({ dispatch, getState }) {\n  return next => action =>\n     { return next(action) }\n}\n// or\nexport function createMiddleware() {\n  return ({ dispatch, getState }) => next => action =>\n    { return next(action) }\n}\n```\n问：`middlewareAPI`中的`dispatch`为何用匿名函数包起来？\n答：经过`applyMiddleware()`之后的`dispatch`是更新过的，包起来后，只要`dispatch`更新，`middlewareAPI`中的`dispatch`也会变化\n\n举个栗子🌰，\"臭名昭著\"的`Thunk`\n```js\nfunction createThunkMiddleware(extraArgument) {\n  return ({ dispatch, getState }) => next => action => {\n    if (typeof action === 'function') {\n      return action(dispatch, getState, extraArgument);\n    }\n    return next(action);\n  };\n}\nconst thunk = createThunkMiddleware();\nthunk.withExtraArgument = createThunkMiddleware;\nexport default thunk;\n```\n\n```js\nexport default function applyMiddleware(...middlewares) {\n  return (createStore) => (reducer, preloadedState, enhancer) => {\n    const store = createStore(reducer, preloadedState, enhancer)\n    let dispatch = store.dispatch\n    let chain = []\n\n    const middlewareAPI = {\n      getState: store.getState,\n      dispatch: (action) => dispatch(action)\n    }\n    chain = middlewares.map(middleware => middleware(middlewareAPI))\n    dispatch = compose(...chain)(store.dispatch)\n\n    return {\n      ...store,\n      dispatch\n    }\n  }\n}\n```\n\n[GitHub repo for Redux](https://github.com/reactjs/redux)",
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      "body": "[Source](https://gravitational.com/blog/troubleshooting-kubernetes-networking/)\n[Plagiarism](http://www.plagiarism.org/plagiarism-101/what-is-plagiarism/) is the copying & pasting of others work without giving credit to the original author or artist. Plagiarized posts are considered spam. \r\n\r\nSpam is discouraged by the community, and may result in action from the [cheetah bot](https://steemit.com/faq.html#What_is__cheetah).\r\n\r\n[More information and tips on sharing content.](https://steemcleaners.org/copy-paste-plagiarism/)\r\n\r\nIf you believe this comment is in error, please contact us in [#disputes on Discord](https://discord.gg/YR2Wy5A)",
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      "title": "Node.js进阶666 等级考试",
      "body": "# Node.js challenge\n\n![node js](https://user-images.githubusercontent.com/2193706/40960139-61b1a9ba-68d1-11e8-8501-ce10a5933de8.png)\n\n## 四级\n\n> What is the relationship between Node.js and V8? Can Node work without V8?\n\n> How come when you declare a global variable in any Node.js file it’s not really global to all modules?\n\n> When exporting the API of a Node module, why can we sometimes use exports and other times we have to use module.exports?\n\n> Can we require local files without using relative paths?\n\n> Can different versions of the same package be used in the same application?\n\n> What is the Event Loop? Is it part of V8?\n\n> What is the Call Stack? Is it part of V8?\n\n> What is the difference between setImmediate and process.nextTick?\n\n> How do you make an asynchronous function return a value?\n\n> Can callbacks be used with promises or is it one way or the other?\n\n> What Node module is implemented by most other Node modules?\n\n> What are the major differences between spawn, exec, and fork?\n\n> How does the cluster module work? How is it different than using a load balancer?\n\n> What are the --harmony-* flags?\n\n## 六级\n\n> How can you read and inspect the memory usage of a Node.js process?\n\n> What will Node do when both the call stack and the event loop queue are empty?\n\n> What are V8 object and function templates?\n\n> What is libuv and how does Node.js use it?\n\n> How can you make Node’s REPL always use JavaScript strict mode?\n\n> What is process.argv? What type of data does it hold?\n\n> How can we do one final operation before a Node process exits? Can that operation be done asynchronously?\n\n> What are some of the built-in dot commands that you can use in Node’s REPL?\n\n> Besides V8 and libuv, what other external dependencies does Node have?\n\n> What’s the problem with the process uncaughtException event? How is it different than the exit event?\n\n> What does the _ mean inside of Node’s REPL?\n\n> Do Node buffers use V8 memory? Can they be resized?\n\n> What’s the difference between Buffer.alloc and Buffer.allocUnsafe?\n\n> How is the slice method on buffers different from that on arrays?\n\n> What is the string_decoder module useful for? How is it different than casting buffers to strings?\n\n> What are the 5 major steps that the require function does?\n\n> How can you check for the existence of a local module?\n\n> What is the main property in package.json useful for?\n\n> What are circular modular dependencies in Node and how can they be avoided?\n\n> What are the 3 file extensions that will be automatically tried by the require function?\n\n> When creating an http server and writing a response for a request, why is the end() function required?\n\n> When is it ok to use the file system *Sync methods?\n\n## 八级\n\n> How can you print only one level of a deeply nested object?\n\n> What is the node-gyp package used for?\n\n> The objects exports, require, and module are all globally available in every module but they are different in every module. How?\n\n> If you execute a node script file that has the single line: console.log(arguments);, what exactly will node print?\n\n> How can a module be both requirable by other modules and executable directly using the node command?\n\n> What’s an example of a built-in stream in Node that is both readable and writable?\n\n> What happens when the line cluster.fork() gets executed in a Node script?\n\n> What’s the difference between using event emitters and using simple callback functions to allow for asynchronous handling of code?\n\n> What is the console.time function useful for?\n\n> What’s the difference between the Paused and the Flowing modes of readable streams?\n\n> What does the --inspect argument do for the node command?\n\n> How can you read data from a connected socket?\n\n> The require function always caches the module it requires. What can you do if you need to execute the code in a required module many times?\n\n> When working with streams, when do you use the pipe function and when do you use events? Can those two methods be combined?\n\n## 无极\n\n> Can you rewrite Node.js using Node.js? How?",
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      "body": "## v1.10\n\n# Container\n\n![kube container](https://user-images.githubusercontent.com/2193706/39179862-00a3623a-47e8-11e8-8811-94392c97700b.png)\n\n# Pod\n\n![kube pod](https://user-images.githubusercontent.com/2193706/39179987-52689f4a-47e8-11e8-9d6f-8623809b69ff.png)\n\n# Service\n\n![kube service](https://user-images.githubusercontent.com/2193706/39180012-5f9176d8-47e8-11e8-911d-e86cbf549785.png)\n\n# Deployment\n\n![kube deployment](https://user-images.githubusercontent.com/2193706/39180022-69d23218-47e8-11e8-9a15-c900b3f5d38e.png)\n\n# Ingress\n\n![kube ingress](https://user-images.githubusercontent.com/2193706/39180044-763c9e9e-47e8-11e8-992f-c535709db89a.png)\n\n# Job\n\n![kube job](https://user-images.githubusercontent.com/2193706/39344834-6e15c962-4a17-11e8-9af9-801f387095a1.png)\n\n# CronJob\n\n![kube cronjob](https://user-images.githubusercontent.com/2193706/39344841-7d525166-4a17-11e8-9f59-6d7fb07b4c4d.png)\n\n# NetworkPolicy\n\n![kube networkpolicy](https://user-images.githubusercontent.com/2193706/39344849-87df49f4-4a17-11e8-8d99-cfde9cbfe32a.png)",
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      "body": "# Cluster Introspection\n```bash\nkubectl get services                # List all services \nkubectl get pods                    # List all pods\nkubectl get nodes -w                # Watch nodes continuously\nkubectl version                     # Get version information\nkubectl cluster-info                # Get cluster information\nkubectl config view                 # Get the configuration\nkubectl describe node <node>        # Output information about a node\n```\n\n# Pod and Container Introspection\n```bash\nkubectl get pods                         # List the current pods\nkubectl describe pod <name>              # Describe pod <name>\nkubectl get rc                           # List the replication controllers\nkubectl get rc --namespace=\"<namespace>\" # List the replication controllers in <namespace>\nkubectl describe rc <name>               # Describe replication controller <name>\nkubectl get svc                          # List the services\nkubectl describe svc <name>              # Describe service <name>\n```\n\n# Interacting with Pods\n```bash\nkubectl run <name> --image=<image-name>\n# Launch a pod called <name>\n# using image <image-name>\n \nkubectl create -f <manifest.yaml>\n# Create a service described\n# in <manifest.yaml>\n\nkubectl scale --replicas=<count> rc <name>\n# Scale replication controller\n# <name> to <count> instances\n \nkubectl expose rc <name> --port=<external> --target-port=<internal>\n# Map port <external> to\n# port <internal> on replication\n# controller <name>\n```\n\n# Stopping Kubernetes\n```bash\nkubectl delete pod <name>                                         # Delete pod <name>\nkubectl delete rc <name>                                          # Delete replication controller <name>\nkubectl delete svc <name>                                         # Delete service <name>\nkubectl drain <n> --delete-local-data --force --ignore-daemonsets # Stop all pods on <n>\nkubectl delete node <name>                                        # Remove <node> from the cluster\n```\n\n# Debugging\n```bash\nkubectl exec <service> <command> [-c <$container>]\n# execute <command> on <service>, optionally \n# selecting container <$container>\n \nkubectl logs -f <name> [-c <$container>]\n# Get logs from service <name>, optionally\n# selecting container <$container>\n \nwatch -n 2 cat /var/log/kublet.log\n# Watch the Kublet logs\nkubectl top node\n# Show metrics for nodes\nkubectl top pod\n# Show metrics for pods\n```\n\n# Administration\n```bash\nkubeadm init    \n# Initialize your master node\nkubeadm join --token <token> <master-ip>:<master-port> \n# Join a node to your Kubernetes cluster\nkubectl create namespace <namespace>  \n# Create namespace <name>\nkubectl taint nodes --all node-role.kubernetes.io/master-\n# Allow Kubernetes master nodes to run pods\nkubeadm reset \n# Reset current state\nkubectl get secrets \n# List all secrets\n```\n\n# Troubleshooting Networking Issues\n\n## IP forwarding\n> allows forwarding of the traffic coming from one interface to be routed to another interface.\n\n> is necessary for Linux kernel to route traffic from containers to the outside world.\n\n> otherwise Pod to service connection times out, tcpdump could show that lots of repeated SYN packets are sent, but no ACK is received.\n```bash\n# check that  ipv4 forwarding is enabled\nsysctl net.ipv4.ip_forward\n# 0 means that forwarding is disabled\nnet.ipv4.ip_forward = 0\n# this will turn things back on a live server\nsysctl -w net.ipv4.ip_forward=1\n# on Centos this will make the setting apply after reboot\necho net.ipv4.ip_forward=1 >> /etc/sysconf.d/10-ipv4-forwarding-on.conf\n```\n\n## Bridge-netfilter\n> enables iptables rules to work on Linux bridges just like the ones set up by Docker and Kubernetes.\n\n> is necessary for the Linux kernel to be able to perform address translation in packets going to and from hosted containers.\n\n> otherwise network requests to services outside the Pod network will start timing out with destination host unreachable or connection refused errors.\n```bash\n# check that bridge netfilter is enabled\nsysctl net.bridge.bridge-nf-call-iptables\n# 0 means that bridging is disabled\nnet.bridge.bridge-nf-call-iptables = 0\n# Note some distributions may have this compiled with kernel,\n# check with cat /lib/modules/$(uname -r)/modules.builtin | grep netfilter\nmodprobe br_netfilter\n# turn the iptables setting on\nsysctl -w net.bridge.bridge-nf-call-iptables=1\necho net.bridge.bridge-nf-call-iptables=1 >> /etc/sysconf.d/10-bridge-nf-call-iptables.conf\n```\n\n## Firewall rules block overlay network traffic\n> one of most common on-premise Kubernetes networking setups leverages a VxLAN overlay network, where IP packets are encapsulated in UDP and sent over port 8472.\n\n> there is 100% packet loss between pod IPs either with lost packets or destination host unreachable.\n\n> better to use the same protocol to transfer the data, as firewall rules can be protocol specific, e.g. could be blocking UDP traffic.\n```bash\n#  on the server side\niperf -s -p 8472 -u\n# on the client side \niperf -c 172.28.128.103 -u -p 8472 -b 1K\n# to fix, update the firewall rule to stop blocking the traffic\n```\n\n## AWS source/destination check\n> AWS performs source destination check by default. 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