If you are running the yml with docker-compose, you can just run `docker-compose up -d` and it will recreate any containers that have changes and leave all unchanged services untouched.

    $ cat docker-compose.env2.yml
    version: &#39;2&#39;
    
    services:
      test:
        image: busybox
        # command: env
        command: tail -f /dev/null
        environment:
          - MY_VAR=hello
          - MY_VAR2=world
      test2:
        image: busybox
        command: tail -f /dev/null
        environment:
          - MY_VAR=same ole same ole
    
    $ docker-compose -f docker-compose.env2.yml up -d                                               
    Creating network &quot;test_default&quot; with the default driver
    Creating test_test_1
    Creating test_test2_1
    
    $ vi docker-compose.env2.yml # edit the file to change MY_VAR
    
    $ docker-compose -f docker-compose.env2.yml up -d
    Recreating test_test_1
    test_test2_1 is up-to-date

If you run the containers as a `docker stack deploy -c docker-compose.yml` with a version 3 file format, you can do a rolling update of the service which will prevent any downtime if you have multiple instances of your service running. This functionality is still very new, you&#39;ll want 1.13.1 to fix some of the issues with updates, and as with anything this new, bugs are still being worked out.


I just implemented the new Cloud Functions for Firebase, but there something in the log that bothers me:

&gt; Billing account not configured. External network is not accessible and
&gt; quotas are severily limited. Configure billing account to remove these
&gt; restrictions

I actually managed to access the function from the external network, so I&#39;m wondering do I really have to give my billing account? There&#39;s nothing about this in the firebase documentation.

I&#39;m using the Spark subscription plan for personal test purposes and I don&#39;t want to add billing info if I&#39;m not going to pay for anything yet.

Cloud Functions for Firebase - Billing account not configured

I was wondering how I am able to plot images side by side using `matplotlib` for example something like this:

[![enter image description here][1]][1]


The closest I got is this:

[![enter image description here][2]][2]

This was produced by using this code:

    f, axarr = plt.subplots(2,2)
    axarr[0,0] = plt.imshow(image_datas[0])
    axarr[0,1] = plt.imshow(image_datas[1])
    axarr[1,0] = plt.imshow(image_datas[2])
    axarr[1,1] = plt.imshow(image_datas[3])

But I can&#39;t seem to get the other images to show. I&#39;m thinking that there must be a better way to do this as I would imagine trying to manage the indexes would be a pain. I have looked through the [documentation][3] although I have a feeling I may be look at the wrong one. Would anyone be able to provide me with an example or point me in the right direction? 


**EDIT:**

See the [answer][4] from [@duhaime][5] if you want a function to automatically determine the grid size.


  [1]: https://i.stack.imgur.com/dDepR.jpg
  [2]: https://i.stack.imgur.com/J3fpW.png
  [3]: http://matplotlib.org/examples/pylab_examples/subplots_demo.html#pylab-examples-subplots-demo
  [4]: https://stackoverflow.com/a/66961099/7758804
  [5]: https://stackoverflow.com/users/1727392/duhaime

Plotting images side by side using matplotlib

**docker-compose.yml**

    version: &#39;2&#39;
    services:
      app:
        build:
          context: .
        command: python src/app.py
        restart: on-failure
        depends_on:
          - db
        environment:
          - TJBOT_DB_HOST=db
          - TJBOT_API_KEY
          - TJBOT_AUTO_QUESTION_TIME
        env_file:
          - .env
      db:
        image: mongo:3.0.14
        volumes:
          - mongodbdata:/data/db
    volumes:
      mongodbdata:

If I change the `.env` file, how could I reload the container to use the new environment variables with minimum downtime?

How to reload environment variables in docker-compose container with minimum downtime?

docker-compose.yml
<pre><code class="hljs language-yaml">version: '2'
services:
 app:
 build:
 context: .
 command: python src/app.py
 restart: on-failure
 depends_on:
 - db
 environment:
 - TJBOT_DB_HOST=db
 - TJBOT_API_KEY
 - TJBOT_AUTO_QUESTION_TIME
 env_file:
 - .env
 db:
 image: mongo:3.0.14
 volumes:
 - mongodbdata:/data/db
volumes:
 mongodbdata:
</code></pre>
If I change the <code>.env</code> file, how could I reload the container to use the new environment variables with minimum downtime?

Is it possible to run Windows containers on Linux? The scenario is based on an application written in **.NET** (old net) and the **Linux user** that wants to run this with Docker needs to provide a `net462` written API on the `localhost`.

I am using the beta version of [Docker Desktop for Windows][1].

If no, then why can Windows run Linux containers and not vice-versa?

---

As some time has passed and this question is a popular one, I&#39;d like to add one note here that the workaround is to use the new [.NET Standard](https://docs.microsoft.com/en-us/dotnet/standard/net-standard?tabs=net-standard-1-0). It allowed me to pack the `4.6.2` framework into a new library.

  [1]: https://docs.docker.com/docker-for-windows/






Can Windows containers be hosted on Linux?

Windows Firewall is blocking my attempt to allows Docker for Windows to share C: on windows 10 machine.

Works fine when Windows Firewall off. When its on I get 

&gt; A firewall is blocking file Sharing between Windows and the
&gt; containers. See documentation for more info.

The documentation says 

&gt; You do not need to open port 445 on any other network. By default,
&gt; allow connections to 10.0.75.1 port 445 (the Windows host) from
&gt; 10.0.75.2 (the virtual machine).

I am &quot;googled out&quot; on trying to find how to do that - can someone advise?

Settings to Windows Firewall to allow Docker for Windows to share drive

I&#39;m trying to use docker to automate maven builds. The project I want to build takes nearly 20 minutes to download all the dependencies, so I tried to build a docker image that would cache these dependencies, but it doesn&#39;t seem to save it. My Dockerfile is

    FROM maven:alpine
    RUN mkdir -p /usr/src/app
    WORKDIR /usr/src/app
    ADD pom.xml /usr/src/app
    RUN mvn dependency:go-offline

The image builds, and it does download everything. However, the resulting image is the same size as the base `maven:alpine` image, so it doesn&#39;t seem to have cached the dependencies in the image. When I try to use the image to `mvn compile` it goes through the full 20 minutes of redownloading everything.

Is it possible to build a maven image that caches my dependencies so they don&#39;t have to download everytime I use the image to perform a build?

I&#39;m running the following commands:

    docker build -t my-maven .

    docker run -it --rm --name my-maven-project -v &quot;$PWD&quot;:/usr/src/mymaven -w /usr/src/mymaven my-maven mvn compile

My understanding is that whatever `RUN` does during the docker build process becomes part of the resulting image.

Maven docker cache dependencies

I have a docker 1.12 running on CentOS. I am trying to add insecure registry to it and things mentioned in documentation just don&#39;t work. The system uses `systemd` so I created a `/etc/systemd/system/docker.service.d/50-insecure-registry.conf` file.

    $ cat /etc/systemd/system/docker.service.d/50-insecure-registry.conf
    [Service]
    Environment=&#39;DOCKER_OPTS=--insecure-registry=&quot;hostname.cloudapp.net:5000&quot;&#39;

After loading daemon and restarting docker service, systemd shows that the environment variable is there 

    $ sudo systemctl show docker | grep Env
    Environment=DOCKER_OPTS=--insecure-registry=&quot;hostname.cloudapp.net:5000&quot;

But when I run `docker info` I don&#39;t see that insecure registry added 

    $ docker info
    ........
    Registry: https://index.docker.io/v1/
    WARNING: bridge-nf-call-iptables is disabled
    WARNING: bridge-nf-call-ip6tables is disabled
    Insecure Registries:
        127.0.0.0/8
   
Pushing images to `hostaneme.cloudapp.net` fails with  

    Pushing application     (hostname.cloudapp.net:5000/application:latest)...
    The push refers to a repository     [hostname.cloudapp.net:5000/mozart_application]
    ERROR: Get https://hostname.cloudapp.net:5000/v1/_ping: http: server gave HTTP response to HTTPS client

Is there something that could be done ? Am I missing something ? 

**UPDATE**

Resolved the issue by adding a file `/etc/docker/daemon.json` with following content

    {
        &quot;insecure-registries&quot; : [ &quot;hostname.cloudapp.net:5000&quot; ]
    }

And then restart docker 

    sudo systemctl daemon-reload
    sudo systemctl restart docker

After that insecure registry `hostname.cloudapp.net:500` works.





Add Insecure Registry to Docker

I looked thru the docs for docker-compose and I see that Version 3 has a deploy restart policy but it&#39;s only for swarm. I tried setting restart_policy on my service but got this error:

    ERROR: The Compose file &#39;./docker-compose.yml&#39; is invalid because:
    Unsupported config option for services.web: &#39;restart_policy&#39;

**Is there any way to set a restart policy on services created using docker-compose outside of a swarm?**


Docker-Compose Restart Policy

In our Jenkins agents we are running about several (around 20) tests whose setup involves running `docker-compose up` for a &quot;big&quot; number of services/containers (around 14).

From time to time, I&#39;ll get the following error:

    ERROR: for testdb-data  UnixHTTPConnectionPool(host=&#39;localhost&#39;, port=None): Read timed out. (read timeout=60)
    An HTTP request took too long to complete. Retry with --verbose to obtain debug information.
    If you encounter this issue regularly because of slow network conditions, consider setting COMPOSE_HTTP_TIMEOUT to a higher value (current value: 60).

Haven&#39;t been able to reproduce this consistently. And I&#39;m still trying to figure out whether or not there is a correlation with our agent&#39;s resources being at full use.

`docker -v` is `1.10.1` and `docker-compose -v` is `1.13.1`.

Any ideas about what this may be related to?

`docker-compose up` times out with UnixHTTPConnectionPool

I&#39;m trying to create an Nginx/PHP FPM setup with docker compose and am having issues with the version 3 volumes syntax/changes.

My `Dockerfile`:

    FROM php:7-fpm
    VOLUME /var/www/html

My `docker-compose.yml`:

    version: &quot;3&quot;
    services:
      php:
        build: .
        volumes:
          - ./html:/var/www/html
      web:
        image: nginx
        links:
          - php
        ports:
          - &quot;8888:80&quot;
        volumes:
          - php:/var/www/html
          - ./default.conf:/etc/nginx/conf.d/default.conf
    volumes:
      php:

When I add an `index.php` file into `./html`, I can view that by going to http://localhost:8888, but any static files (like CSS) return a 404 because Nginx cannot find those in its container (`/var/www/html` is empty on the nginx container). With version 3 docker compose files do not have `volumes_from` anymore, which is basically what I&#39;m trying to replicate.

How can I get this to work with version 3?


docker-compose volumes_from equivalent with version 3

I am trying to dockerize a PHP application. In the dockerfile, I download the archive, extract it, etc.

Everything works fine. However, if a new version gets released and I update the dockerfile, I have to reinstall the application, because the config.php gets overwritten.

So I thought I can mount the file as a volume, like I do with the database.

I tried it two ways, with a volume and a direct path.

docker-compose:

&lt;!-- language: lang-yaml --&gt;

    version: &#39;2&#39;
    services:
      app:
        build: src
        ports:
          - &quot;8080:80&quot;
        depends_on:
          - mysql
        volumes:
          -  app-conf:/var/www/html/upload
          -  app-conf:/var/www/html/config.php
        environment:
          DB_TYPE: mysql
          DB_MANAGER: MysqlManager
    
      mysql:
        image: mysql:5.6
        container_name: mysql
        volumes:
          - mysqldata:/var/lib/mysql
        ports:
          - 3306:3306
        environment:
          MYSQL_ROOT_PASSWORD:
          MYSQL_DATABASE:
          MYSQL_USER:
          MYSQL_PASSWORD:
    
    volumes:
      mysqldata:
      app-conf:

Which results in the error:



And I tried it with a given path, as a mounted volume.

    /src/docker/myapp/upload:/var/www/html/upload
    /src/docker/myapp/upload:/var/www/html/config.php

However, both ways are not working. With the mounted volume, I see that upload gets created. 

But then it fails with:

&gt; /var/www/html/config.php\\\&quot; caused \\\&quot;not a directory\\\&quot;\&quot;&quot;

If I try it with

    /src/docker/myapp/upload/config.php:/var/www/html/config.php

Docker creates the upload folder and then a config.php folder. Not a file.

Or is there another way to persist the config?

How to mount a single file in a volume

I&#39;m using the Windows 10 Home operating system. 
I have installed Docker toolbox.

I have created a docker image of my .net core application by using following command. 

    $  docker build -t helloWorld:core .

Now I want to ship this image, to another machine. But I am not getting the image file.

Can someone please tell me, where my image will get saved? Or is there any way, to specify docker an image path in docker build command.

Where is docker image location in Windows 10?

I am unable to specify CPU and memory limitation for services specified in version 3.

With version 2 it works fine with `mem_limit` &amp; `cpu_shares` parameters under the services. But it fails while using version 3, putting them under `deploy` section doesn&#39;t seem worthy unless I am using swarm mode.

Can somebody help?

```yml
    version: &quot;3&quot;
    services:
      node:
        build:
         context: .
          dockerfile: ./docker-build/Dockerfile.node
        restart: always
        environment:
          - VIRTUAL_HOST=localhost
        volumes:
          - logs:/app/out/
        expose:
          - 8083
        command: [&quot;npm&quot;,&quot;start&quot;]
        cap_drop:
          - NET_ADMIN
          - SYS_ADMIN
```


Content Type	Original Author	Original Content on Stackoverflow
Question	Marcos Costa Pinto	View Question on Stackoverflow
Solution 1 - Docker	BMitch	View Answer on Stackoverflow

How to reload environment variables in docker-compose container with minimum downtime?

Docker Problem Overview

Docker Solutions

Solution 1 - Docker

Plotting images side by side using matplotlib

Cloud Functions for Firebase - Billing account not configured

Attributions