It historically comes from Google’s internal practices. They&#39;re called &quot;z-pages&quot;.

The reason it ends with `z` is to reduce collisions with actual application endpoints with the same name (like `/status`). See this talk for more: https://vimeo.com/173610242

Similar endpoints (at least inside Google) are `/varz`, `/statusz`, `/rpcz`. Services developed at Google automatically get these endpoints to export their health and metrics and there are tools that collect the exposed metrics/statuses from all the deployed services.

Open source tools like Prometheus implement this pattern (since original authors of Prometheus are also ex-Googlers) by coming to a well-known endpoint to collect metrics from your application. Similarly [OpenCensus][1] allows you to expose z-pages from your app (ideally on a different port) to diagnose problems.



  [1]: http://opencensus.io

I&#39;ve a lot of tables in [Lovefield][1] and their respective Interfaces for what columns they have.

Example:

&lt;!-- language: lang-ts --&gt;

    export interface IMyTable {
      id: number;
      title: string;
      createdAt: Date;
      isDeleted: boolean;
    }

I&#39;d like to have the property names of this interface in an array like this:

&lt;!-- language: lang-ts --&gt;

    const IMyTable = [&quot;id&quot;, &quot;title&quot;, &quot;createdAt&quot;, &quot;isDeleted&quot;];


I cannot make an object/array based on the interface `IMyTable` directly which should do the trick because I&#39;d be getting the interface names of the tables dynamically. Hence I need to iterate over these properties in the interface and get an array out of it.

How do I achieve this result?


  [1]: https://github.com/google/lovefield


Get keys of a Typescript interface as array of strings

Recently, I have started  playing with angular 2. It&#39;s awesome so far. So, i have started a demo personal project for the sake of learning using `angular-cli`. 

With the basic routing setup, I now want to navigate to some routes from header, but since my header is a parent to the `router-outlet`, I receive this error. 

**app.component.html**
```html
&lt;app-header&gt;&lt;/app-header&gt; // Trying to navigate from this component
    &lt;router-outlet&gt;&lt;/router-outlet&gt;
&lt;app-footer&gt;&lt;/app-footer&gt;
```
**header.component.html**
```html
&lt;a [routerLink]=&quot;[&#39;/signin&#39;]&quot;&gt;Sign in&lt;/a&gt;
```
Now I understand partially I guess that since that component is a wrapper around `router-outlet` it would not be possible this way to access `router`. So, is there a possibility to access navigation from outside for a scenario like this?


I would be really happy to add any more information if needed. Thank you in advance. 

**Update**

1- My `package.json` already has the stable `@angular/router 3.3.1` version.
2- In my main `app` module, I have imported the `routing-module`. Please see below.

**app.module.ts**

    import { BrowserModule } from &#39;@angular/platform-browser&#39;;
    import { NgModule } from &#39;@angular/core&#39;;
    import { FormsModule } from &#39;@angular/forms&#39;;
    import { HttpModule } from &#39;@angular/http&#39;;
    import { AlertModule  } from &#39;ng2-bootstrap&#39;;
    import { LayoutModule } from &#39;./layout/layout.module&#39;;
    import { UsersModule } from &#39;./users/users.module&#39;;
    import { AppRoutingModule } from  &#39;./app-routing.module&#39;;
    import { AppComponent } from &#39;./app.component&#39;;
    import { PageNotFoundComponent } from &#39;./shared/components/not-found.component&#39;;
    
    @NgModule({
      declarations: [
        AppComponent,
        PageNotFoundComponent
      ],
      imports: [
        BrowserModule,
        FormsModule,
        HttpModule,
        AlertModule.forRoot(),
        LayoutModule,
        UsersModule,
        AppRoutingModule  --&gt; This is the routing module. 
      ],
      providers: [],
      bootstrap: [AppComponent]
    })
    export class AppModule { }

**app-routing.module.ts**

    import { NgModule } from &#39;@angular/core&#39;;
    import { Routes, RouterModule } from &#39;@angular/router&#39;;
    import { SigninComponent } from &#39;./users/signin/signin.component&#39;;
    import { PageNotFoundComponent } from &#39;./shared/components/not-found.component&#39;;
    
    const routes: Routes = [
    { path: &#39;**&#39;, component: PageNotFoundComponent }
    ];
    
    @NgModule({
        imports: [RouterModule.forRoot(routes)],
        exports: [RouterModule]
    })
    
    export class AppRoutingModule {}


The route I am trying to access is delegated from another `module` that is the `UsersModule`

**user-routing.module.ts**

    import { NgModule } from &#39;@angular/core&#39;;
    import { RouterModule, Routes } from &#39;@angular/router&#39;;
    import { SigninComponent } from &#39;./signin/signin.component&#39;;
    
    const usersRoutes: Routes = [
      { path: &#39;signin&#39;,  component: SigninComponent }
    ];
    @NgModule({
      imports: [
        RouterModule.forChild(usersRoutes)
      ],
      exports: [
        RouterModule
      ]
    })
    
    export class UsersRoutingModule { }

While I am trying to navigate from a component that is part of the `Layout` module, but has no notion of the router module. Is that what is causing the error. 

**Layout.module.ts**

    import { NgModule } from &#39;@angular/core&#39;;
    import { HeaderComponent } from &#39;./header/header.component&#39;;
    import { FooterComponent } from &#39;./footer/footer.component&#39;;
    
    @NgModule({
      declarations: [HeaderComponent, FooterComponent],
      exports: [HeaderComponent, FooterComponent]
    })
    export class LayoutModule{}

I am trying to navigate from the `HeaderComponent`. I would be happy to provide more information if needed.

Can&#39;t bind to &#39;routerLink&#39; since it isn&#39;t a known property

In the Kubernetes/Docker ecosystem there is a convention of using `/healthz` as a health-check endpoint for applications.

Where does the name &#39;healthz&#39; come from, and are there any particular semantics associated with that name?

Where does the convention of using /healthz for application health checks come from?

<p>In the Kubernetes/Docker ecosystem there is a convention of using <code>/healthz</code> as a health-check endpoint for applications.</p>
<p>Where does the name 'healthz' come from, and are there any particular semantics associated with that name?</p>


I installed Docker on my macOS Sierra as follows. Note I don&#39;t have VirtualBox installed.

    brew cask uninstall virtualbox
    brew cask install docker

My macOS details.

    $ uname -a
    Darwin m-C02QG7TRG8WN.local 16.5.0 Darwin Kernel Version 16.5.0: Fri Mar  3 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64 x86_64

    $ docker version
    Client:
     Version:      17.03.1-ce
     API version:  1.27
     Go version:   go1.7.5
     Git commit:   c6d412e
     Built:        Tue Mar 28 00:40:02 2017
     OS/Arch:      darwin/amd64

    Server:
     Version:      17.03.1-ce
     API version:  1.27 (minimum version 1.12)
     Go version:   go1.7.5
     Git commit:   c6d412e
     Built:        Fri Mar 24 00:00:50 2017
     OS/Arch:      linux/amd64
     Experimental: true

Once I run Docker from launchpad, I am able to run Docker containers.

    $ docker run -it ubuntu
    root@2351d4222a4e:/# uname -a
    Linux 2351d4222a4e 4.9.13-moby #1 SMP Sat Mar 25 02:48:44 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

My question is how does Docker manage to run a Linux kernel within macOS? I thought Docker would at least require boot2docker or some other such Linux kernel running so that it can create the Ubuntu&#39;s filesystem with the help of it. But the above output seems to indicate that it is not so. Where does the Linux kernel come from then?

How does Docker run a Linux kernel under macOS host?

When do we use a `docker service create` command and when do we use a `docker run` command?

What is the difference between Docker Service and Docker Container?

In my docker compose file there is a dynamic field which I&#39;d like to generate during the running. Actually it is a string template:

    environment:
        - SERVER_URL:https://0.0.0.0:${PORT}

And I want to configure this `PORT` parameter dynamically

    docker-compose run &lt;service&gt; PORT=443

In [documentation][1] there is `ARGS` parameters set I suppose I can use. But there is no information how can I use those inside compose file


  [1]: https://docs.docker.com/compose/reference/run/

Pass argument to docker compose

I&#39;m running a Kubernetes cluster on AWS using kops. I&#39;ve mounted an EBS volume onto a container and it is visible from my application but it&#39;s read only because my application does not run as root. How can I mount a `PersistentVolumeClaim` as a user other than root? The `VolumeMount` does not seem to have any options to control the user, group or file permissions of the mounted path.

Here is my Deployment yaml file:

    apiVersion: extensions/v1beta1
    kind: Deployment
    metadata:
      name: notebook-1
    spec:
      replicas: 1
      template:
        metadata:
          labels:
            app: notebook-1
        spec:
          volumes:
          - name: notebook-1
            persistentVolumeClaim:
              claimName: notebook-1
          containers:
          - name: notebook-1
            image: jupyter/base-notebook
            ports:
            - containerPort: 8888
            volumeMounts:
            - mountPath: &quot;/home/jovyan/work&quot;
              name: notebook-1

Kubernetes: how to set VolumeMount user group and file permissions

I&#39;ve `nignx container` and one `asset container` which have all my assets build from grunt or some other tools.

Now in docker compose file,  i want to mount `asset container&#39;s` &#39;s folder path into `nginx container` so nginx can serve that files.

- How can we do that? i don&#39;t remember but i think there is a option where we can share path of one container with another.

- Suppose if i scale up nginx  to 2 container then will that mount works for all instance of nginx?

- if i scale up `asset container` then what will happen?

- i also want to mount that with my host so development can be done be easily.

Docker compose how to mount path from one to another container?

I have Kubernetes working well in two different environments, namely in my local environment (MacBook running minikube) and as well as on Google&#39;s Container Engine (GCE, Kubernetes on Google Cloud).  I use the MacBook/local environment to develop and test my YAML files and then, upon completion, try them on GCE.  

Currently I need to work with each environment individually:  I need to edit the YAML files in my local environment and, when ready, (git) clone them to a GCE environment and then use/deploy them.  This is a somewhat cumbersome process.

Ideally, I would like to use kubectl from my Macbook to easily switch between the local minikube or GCE Kubernetes environments and to easily determine where the YAML files are used. Is there a simple way to switch contexts to do this?

How to switch kubectl clusters between gcloud and minikube

I am trying to deploy my app to *Kubernetes* running in *Google Container
Engine*.

The app can be found at: https://github.com/Industrial/docker-znc.

The *Dockerfile* is built into an image on *Google Container Registry*.

I have deployed the app in *Kubernetes* via the + button. I don&#39;t have the YAML
for this.

I have inserted a *Secret* in *Kubernetes* for the PEM file required by the app.

  1. How do I get the YAML for the *Deployment*, *Service* and *Pod* created by
     Kubernetes by filling in the form?
  1. How do I get the *Secret* into my *Pod* for usage?

Get YAML for deployed Kubernetes services?

I am trying to deploy nginx on kubernetes, kubernetes version is v1.5.2, 
I have deployed nginx with 3 replica, YAML file is below,

    apiVersion: extensions/v1beta1
    kind: Deployment
    metadata:
      name: deployment-example
    spec:
      replicas: 3
      revisionHistoryLimit: 2
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: nginx:1.10
            ports:
            - containerPort: 80

and now I want to expose its port 80 on port 30062 of node, for that I created a service below, 

    kind: Service
    apiVersion: v1
    metadata:
      name: nginx-ils-service
    spec:
      ports:
        - name: http
          port: 80
          nodePort: 30062
      selector:
        app: nginx
      type: LoadBalancer

this service is working good as it should be, but it is showing as pending not only on kubernetes dashboard also on terminal.
[![Terminal output][1]][1][![Dash board status][2]][2]

  [1]: https://i.stack.imgur.com/ix5v1.png
  [2]: https://i.stack.imgur.com/TUMOB.png

Kubernetes service external ip pending

I would like to run specific command after initialization of deployment is successful.

This is my yaml file:

    apiVersion: extensions/v1beta1
    kind: Deployment
    metadata:
      name: auth
    spec:
      replicas: 1
      template:
        metadata:
            labels:
              app: auth
        spec:
          containers:
            - name: auth
              image: {{my-service-image}}
              env:
              - name: NODE_ENV
                value: &quot;docker-dev&quot;
              resources:
                requests:
                  cpu: 100m
                  memory: 100Mi
              ports:
                - containerPort: 3000

However, I would like to run command for db migration after (not before) deployment is successfully initialized and pods are running. 

I can do it manually for every pod (with kubectl exec), but this is not very scalable.


Content Type	Original Author	Original Content on Stackoverflow
Question	Andy Hume	View Question on Stackoverflow
Solution 1 - Docker	ahmet alp balkan	View Answer on Stackoverflow

Where does the convention of using /healthz for application health checks come from?

Docker Problem Overview

Docker Solutions

Solution 1 - Docker

Can't bind to 'routerLink' since it isn't a known property

Get keys of a Typescript interface as array of strings

Attributions