This answer is now likely to be out of date as it was written in 2015. It may still be useful as reference to reproduce the same

--

This repo from [Docker Hackathon 2015](https://blog.docker.com/2015/05/dc2015-hackathon/) describes how to [build and run iOS apps with the docker client](https://github.com/jkingyens/dockerthon). Is that what you&#39;re after?

Watch the video: 

   * https://www.youtube.com/watch?v=CGHOH9Ocl1k

Secret sauce is in [server.js](https://github.com/jkingyens/dockerthon/blob/master/server.js) that implements a REST API to simulate a docker server. So in fact it&#39;s not actually running iOS in a real Linux docker server - rather it implements the docker API and then acts as a proxy to ios-sim (run) and XCode (build).

Look at [Docker-OSX](https://github.com/sickcodes/Docker-OSX) which runs macOS with Xcode support inside Docker.

You can connect to that macOS via SSH or VNC and use Xcode on Linux

Circle CI has an option to use Xcode in a container. Here is an excerpt of my ci pipleline config:

    ios-build-env: &amp;ios-build-env
      macos:
        xcode: &quot;11.4.1&quot;

    jobs:
      ios-deploy:
        &lt;&lt;: *ios-build-env
        steps:
        - checkout
        ...

Circles docs:
https://circleci.com/docs/2.0/testing-ios/

When I start Android Studio, it shows popup regarding new update of 1.1 release. But when I start updating, After downloading all patch files, while restarting, it shows following error:
 
![enter image description here][1]

I searched almost everywhere on Google and Stackoverflow. There are already two questions on so: [this][2] and [this][3]. But none of them are have any correct answer. I also tried running as administrator, restarting PC, turning off the firewall, uninstalling antivirus. But none of them worked.

I am using windows 7 32-bit. How to solve this problem? Can anyone help?


  [1]: http://i.stack.imgur.com/aKkWA.jpg
  [2]: https://stackoverflow.com/questions/27307952/some-conflicts-were-found-in-the-installtion-area
  [3]: https://stackoverflow.com/questions/27547271/android-studio1-0-0-update-to-1-0-1-on-mac-os-has-error

Android Studio Update: Some conflicts found in installation area

According to [here][1]:

&gt; The HTTP Upgrade header requests that the server ***switch the
&gt; application-layer protocol from HTTP to the WebSocket protocol***.
&gt; 
&gt; The client handshake established a HTTP-on-TCP connection between IE10
&gt; and server. After the server returns its 101 response, the
&gt; application-layer protocol switches from HTTP to WebSockets which uses
&gt; the previously established TCP connection.
&gt; 
&gt; ***HTTP is completely out of the picture*** at this point. Using the
&gt; lightweight WebSocket wire protocol, messages can now be sent or
&gt; received by either endpoint at any time.


So, my understanding is, after the 1st client finished handshake with the server, the server&#39;s 80 port will be ***monopolized*** by the WebSocket protocol. And the **HTTP is no longer working on 80 port**. 

So how could the 2nd client exchange handshake with the server. ***After all the WebSocket handshake is in HTTP format.***

ADD 1
----
Thanks for all the answers so far. They are really helpful.

Now I understand that the same server&#39;s 80 port is ***shared*** by multiple `TCP` connections. And this sharing is totally OK because `TCP` connections are identified by a 5-element tuple as `Jan-Philip Gehrcke` pointed out.


I&#39;d like to add a few thoughts.

Both `WebSocket` and `HTTP` are merely application level protocols. *Usually* they both rely on the `TCP` protocol as their transport. 

Why choose port 80?
---
WebSocket design intentionally choose server&#39;s port 80 for *both handshake and following communication*. I think the designer wants to make WebSocket communication *look like* normal HTTP communication ***from the transport level&#39;s perspective (i.e. the server port number is still 80)***. But according to `jfriend00`&#39;s answer, this trick doesn&#39;t always fool the network infrastructures.  

How does the protocol shift from *HTTP* to *WebSocket* happen?
---
From RFC 6455 - WebSocket protocol

&gt; Basically it is intended to be as close to just exposing raw TCP to
&gt; script as possible given the constraints of the Web. It’s also
&gt; designed in such a way that its servers can share a port with HTTP
&gt; servers, by having its handshake be a valid HTTP Upgrade request. One
&gt; could conceptually use other protocols to establish client-server
&gt; messaging, but the intent of WebSockets is to provide a relatively
&gt; simple protocol that can coexist with HTTP and deployed HTTP
&gt; infrastructure (such as proxies) and that is as close to TCP as is
&gt; safe for use with such infrastructure given security considerations,
&gt; with targeted additions to simplify usage and keep simple things
&gt; simple (such as the addition of message semantics).

So I think I am wrong on the following statement:

&gt; The handshake request *mimic* HTTP request but the communication that
&gt; follows don&#39;t. The handshake request arrives at the server on port 80.
&gt; **Because it&#39;s 80 port, server will treat it with HTTP protocol. And that&#39;s why the WebSocket handshake request must be in HTTP format.** 
&gt; If so, I think the HTTP protocol **MUST** be modified/extended to
&gt; recognize those WebSocket-specific things. Otherwise it won&#39;t realize
&gt; it should ***yield to*** WebSocket protocol.

I think it should be understood like this:

&gt; WebSocket communication starts with a **valid** HTTP request from
&gt; client to server. So it is the server that follows the HTTP protocol
&gt; to parse the handshake request and **identify** the begging for
&gt; protocol change. And it is the server that switches the protocol. So
&gt; HTTP protocol doesn&#39;t need to change. HTTP protocol doesn&#39;t even need
&gt; to know about WebSocket.


WebSocket and Comet
---
So WebSocket is different from [Comet][2] technologies in that WebSoket doesn&#39;t limit itself within the current HTTP realm to solve the bi-directional communication issue.


ADD 2
---
A related question: https://stackoverflow.com/questions/35387835/how-does-a-browser-establish-connection-with-a-web-server-on-80-port


  [1]: https://msdn.microsoft.com/en-us/hh969243.aspx
  [2]: http://en.wikipedia.org/wiki/Comet_%28programming%29

How WebSocket server handles multiple incoming connection requests?

Can I run Xcode in a docker container? I&#39;d like to dockerise an Xcode CI system, just wondering if this is possible.

Can I run Xcode in a docker container?

<p>Can I run Xcode in a docker container? I'd like to dockerise an Xcode CI system, just wondering if this is possible.</p>


I noticed my current bash file has `export PATH=$PATH:/Applications/MAMP/library/bin
` which i put there to set up terminal access to mamp. I&#39;ve been trying to compile `-a MyApp a.xcodeproj` &amp; `open a.xcodeproj` but I&#39;m not sure which one to use and neither works. I also added this to the bash file after suggestion `$ alias xcode=&quot;open -a Xcode&quot;` It still doesn&#39;t work. I need a path/terminal expert to help me configure a way to run Xcode from the terminal because I&#39;m trying to use cocoa pods. 

How to open Xcode from terminal?

I have a list of libraries in my Pod file. I decide to add new one to Pod file. But I want to keep all my previous libraies without updates and just install (add) this one library

    pod &#39;JSAnimatedImagesView&#39;, &#39;~&gt; 1.0.0&#39;

so `pod update` and `pod install` update all libraries to newer versions, but I don&#39;t want to update them just install `pod &#39;JSAnimatedImagesView&#39;, &#39;~&gt; 1.0.0&#39;`

CocoaPods how to install only one new library

I am not finding an option for Hex color code in xib color picker in xcode.

But I have seen in stack over flow answer,
https://stackoverflow.com/a/27283783/4391112.

In this, image is having Hex color code option in color picker.


**Xcode version : 6.1.1**

How can i get that hex color code in color picker in xib.

Please suggest me.

Thanks
 

Update: Is there any plugin for xcode to select color in hexa color code. I am using xcode 6.1.1.

or is there any setting in xcode to change the colr in hexa code.

please help me guys



How to set Hex color code in xib in iOS

I get this error:

`xcrun: error: invalid active developer path (/Applications/Xcode.app), missing xcrun at: /Applications/Xcode.app/usr/bin/xcrun`

This [solution][1] works, but the error occurs again after closing my terminal and reopening it; I then have to run the same commands every time I open a new terminal window.

How can I apply these changes such that they will save after closing the terminal window out?


  [1]: https://stackoverflow.com/questions/14334708/xcrun-cant-find-xcode-path

Invalid active developer path on MAC OS X after installing Ruby

I&#39;d like to create `@IBInspectable` element as you see at the picture below : 

![enter image description here][1]

my idea is to use something like enum as type for `@IBInspectable`, but it looks like it&#39;s not the case, any ideas how to implement element like this ?

EDIT:

It looks like `@IBInspectable` supports only these types :

 - `Int`
 - `CGFloat`
 - `Double`
 - `String`
 - `Bool`
 - `CGPoint`
 - `CGSize`
 - `CGRect`
 - `UIColor`
 - `UIImage`

bummer

  [1]: http://i.stack.imgur.com/EpFXL.png

@IBInspectable with enum?

My directory Structure as follows

     Dockerfile downloads

I want to add downloads to /tmp

  
     ADD downloads /tmp/
     COPY down* /tmp
     ADD ./downloads /tmp

Nothings works. It copies the contents of downloads into tmp. I want to copy the downloads floder. Any idea?

     ADD . tmp/

copies Dockerfile also. i dont want to copy Dockerfile into tmp/

ADD or COPY a folder in Docker

I&#39;m following the [fig guide](http://www.fig.sh/index.html) to using docker with a python application, but when docker gets up to the command

    RUN pip install -r requirements.txt

I get the following error message:

    Step 3 : RUN pip install -r requirements.txt
     ---&gt; Running in fe0b84217ad1
    Collecting blinker==1.3 (from -r requirements.txt (line 1))
      Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by &#39;ProtocolError(&#39;Connection aborted.&#39;, gaierror(-2, &#39;Name or service not known&#39;))&#39;: /simple/blinker/

This repeats several times and then I get another message:

    Could not find any downloads that satisfy the requirement blinker==1.3 (from -r requirements.txt (line 1))
      No distributions at all found for blinker==1.3 (from -r requirements.txt (line 1))

So for some reason pip can&#39;t access any packages from inside a docker container. Is there anything I need to do to allow it internet access?

However pip works fine to install things outside of the docker container, and worked fine even with that exact package (`blinker==1.3`) so that&#39;s not the problem. Also this problem isn&#39;t specific to that package. I get the same issue with any `pip install` command for any package.

Does anyone have any idea what&#39;s going on here?

Can&#39;t install pip packages inside a docker container with Ubuntu

Can I specify a port range in a Dockerfile

    EXPOSE 7000-8000

and when running the container bind all these exposed ports to the same ports on the host machine?

    docker run -p 7000-8000:7000-8000

Docker expose all ports or range of ports from 7000 to 8000

I&#39;m using a Docker image which was built using the USER command to use a non-root user called `dev`.
Inside a container, I&#39;m &quot;dev&quot;, but I want to edit the `/etc/hosts` file.

So I need to be root. I&#39;m trying the su command, but I&#39;m asked to enter the root password.

What&#39;s the default root user&#39;s password inside a Docker container?


Root password inside a Docker container

I tried adding to the `PATH` in the files `~/.profile` and `/etc/profile` as follow.

    PATH = $PATH:/required/path

However, it does not work. Then I tried with adding the line show, which did not work either. 

    export PATH

It did not work even after restarting the container and the host both.  

Content Type	Original Author	Original Content on Stackoverflow
Question	Chris	View Question on Stackoverflow
Solution 1 - Xcode	Tony O'Hagan	View Answer on Stackoverflow
Solution 2 - Xcode	Alex Kosh	View Answer on Stackoverflow
Solution 3 - Xcode	Jared Anderton	View Answer on Stackoverflow

Can I run Xcode in a docker container?

Xcode Problem Overview

Xcode Solutions

Solution 1 - Xcode

Solution 2 - Xcode

Solution 3 - Xcode

How WebSocket server handles multiple incoming connection requests?

Android Studio Update: Some conflicts found in installation area

Attributions