Your best source of information is the issue you linked to [docker#5618](https://github.com/docker/docker/issues/5618). This is a kernel bug, and has not yet been resolved. The issue is &quot;triggered&quot; by docker because starting/stopping containers also creates network interfaces for containers when they are created/destroyed.

This is my code:

    const func = () =&gt; {
      return (
        &lt;div &gt;
           you&#39;re free
          &lt;/div&gt;
      )}

Somehow eslint flags the line &quot;you&#39;re free&quot; with error `error  HTML entities must be escaped  react/no-unescaped-entities`

However from what I can see jsx has escaped the apostrophes already. I can see the words `you&#39;re free` is rendered without issue. If I escape it as `&amp;#39;`, then it will be very hard for me to search for the string (I would expect a search of `you&#39;re free` in an editor to return a hit. But obviously the editor will miss because the text is actually `you&amp;#39;re free`)

So what is the best way to address this eslint exception?

How to fix this violation of this &#39;react/no-unescaped-entitie&#39; of eslint rule?

Why are some maven projects in IntelliJ greyed out?

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/ttD2Q.png

Why are some maven projects in IntelliJ grayed out?

I&#39;m running Docker on CentOS 7, from time to time there&#39;s the following message displayed:

    Message from syslogd@dev-master at Mar 29 17:23:03 ...
      kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

I&#39;ve googled a lot, read a lot of resources found and tried many ways like keeping my system updated, upgrading kernel etc, but the message still keeps showing up, it&#39;s not too often but sooner or later I&#39;ll see it. Also I found [issue for this problem on docker github][1] is still open, then my questions are:

1. What does this message mean? Could somebody give me a simple explanation why docker causes it?
2. Is there any workaround for this?
3. If it could not be fixed yet(the issue is still open), will it affect the server or services running inside docker container? Will it be a serious performance issue because it also happens on our production servers? 

Docker version:

    Client:
     Version:      1.11.1
     API version:  1.23
     Go version:   go1.5.4
     Git commit:   5604cbe
     Built:        Wed Apr 27 00:34:42 2016
     OS/Arch:      linux/amd64

    Server:
     Version:      1.11.1
     API version:  1.23
     Go version:   go1.5.4
     Git commit:   5604cbe
     Built:        Wed Apr 27 00:34:42 2016
     OS/Arch:      linux/amd64

OS info: 

    CentOS 7, with kernel version: 4.6.0-1.el7.elrepo.x86_64

I really appreciate for any info/tips or resources, thanks a lot. 


  [1]: https://github.com/docker/docker/issues/5618

Docker on CentOS 7.2: kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

I'm running Docker on CentOS 7, from time to time there's the following message displayed:
<pre><code class="hljs language-css">Message from syslogd@dev-master at Mar 29 17:23:03 ...
 kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
</code></pre>
I've googled a lot, read a lot of resources found and tried many ways like keeping my system updated, upgrading kernel etc, but the message still keeps showing up, it's not too often but sooner or later I'll see it. Also I found <a href="https://github.com/docker/docker/issues/5618" target="_blank" rel="noopener noreferrer">issue for this problem on docker github</a> is still open, then my questions are:
<ol>
<li>What does this message mean? Could somebody give me a simple explanation why docker causes it?</li>
<li>Is there any workaround for this?</li>
<li>If it could not be fixed yet(the issue is still open), will it affect the server or services running inside docker container? Will it be a serious performance issue because it also happens on our production servers?</li>
</ol>
Docker version:
<pre><code class="hljs language-yaml">Client:
 Version: 1.11.1
 API version: 1.23
 Go version: go1.5.4
 Git commit: 5604cbe
 Built: Wed Apr 27 00:34:42 2016
 OS/Arch: linux/amd64

Server:
 Version: 1.11.1
 API version: 1.23
 Go version: go1.5.4
 Git commit: 5604cbe
 Built: Wed Apr 27 00:34:42 2016
 OS/Arch: linux/amd64
</code></pre>
OS info:
<pre><code class="hljs language-csharp">CentOS 7, with kernel version: 4.6.0-1.el7.elrepo.x86_64
</code></pre>
I really appreciate for any info/tips or resources, thanks a lot.

I am trying to understand few things about Docker:

 1. How can I find the network my container is in ?
 2. Can I dynamically detach my container and attach on an other network ? How?
 3. If I have two containers running, how to check if the two are in the
    same network ? Can I ping one from other ?

 

Docker : How to find the network my container is in?

I created an internet gateway in AWS VPC dashboard, I attached it to a VPC then I want to detach it but I keep getting this error:

    Network vpc-xxxx has some mapped public adresses, Please unmap those public addresses before detaching the gateway. ( Service: AmazonEC2; Status Code: 400; Error Code: DependencyViolation; Request ID: qfdqsdf)

What to do to detache this IGW ? Why exactly do I get this error?

I need to get rid of this IGW without deleting extra resources. please any ideas?

For information, the route table of the VPC does contain public addresses but they are routed to other targets. This IGW is not set as target anywhere.

Can&#39;t delete AWS internet Gateway

I am a noob using `create-react-app` to create a App, `yarn start` start the server at `http://localhost:3000/`, I can&#39;t visit this url on my mobile.
How can I make some configs to preview the app on my mobile? 

How to make React app preview on mobile?

I am using ***create-react-app*** and hosting in its default port **localhost:3000** and want to access this from another device on the same network.

I got the IP of my host&#39;s IP (using *ifconfig*) **192.168.0.5** and tried opening ***192.168.0.5:3000*** but that did not work.

Is there any way to achieve this?

How to open a create-react-app from another computer connected to the same network?

I try to understand protobuf and gRPC and how I can use both. Could you help me understand the following:

 - Considering the [OSI model][1] what is where, for example is Protobuf at layer 4?
 - Thinking through a message transfer how is the &quot;flow&quot;, what is gRPC doing what protobuf misses?
 - If the sender uses protobuf can the server use gRPC or does gRPC add something which only a gRPC client can deliver?
 - If gRPC can make synchronous and asynchronous communication possible, Protobuf is just for the marshalling and therefore does not have anything to do with state - true or false?
 - Can I use gRPC in a frontend application communicating instead of REST or GraphQL?

I already know - or assume I do - that:

[Protobuf][2]

 - Binary protocol for data interchange
 - Designed by Google
 - Uses generated &quot;Struct&quot; like description at client and server to un-/-marshall message

[gRPC][3]

 - Uses protobuf (v3)
 - Again from Google
 - Framework for RPC calls
 - Makes use of HTTP/2 as well
 - Synchronous and asynchronous communication possible

I again assume its an easy question for someone already using the technology. I still would thank you to be patient with me and help me out. I would also be really thankful for any network deep dive of the technologies.


  [1]: https://en.wikipedia.org/wiki/OSI_model
  [2]: https://developers.google.com/protocol-buffers/docs/reference/overview
  [3]: https://grpc.io/docs/guides/

protobuf vs gRPC

I am trying to get started with Docker on Windows. My machine has 4GB of RAM and a 1.9GHz - 2.5GHz Intel i5 processor, running Windows 10 Pro x64. I know these aren&#39;t powerful specs, but I would have thought I should be able to run Docker?

However, having downloaded Docker, I get the error message:

&gt; Not Enough memory to start docker

I have seen various forum posts and github issues about this and followed all the advice I can see, such as modifying the settings in Docker, I tried these:

[![enter image description here][1]][1]

They also mentioned changing the settings of the Hyper-V VM however, this seems to be deleted and recreated with the Docker specified settings on every attempted launch. I tried 2048MB, 1792MB, 1536MB, 1280MB and 1024MB of RAM, all of which failed. 

What else can I do? Surely I can run docker in some form on my machine? NB: I have closed all non-essential background apps. There doesn&#39;t seem to be many other suggestions for what seems to be a fairly common issue, where the given solutions don&#39;t work?


  [1]: https://i.stack.imgur.com/8kXrR.png
  [2]: https://i.stack.imgur.com/G04HV.png

Docker won&#39;t start on Windows: Not Enough memory to start docker

I&#39;m trying to learn docker at the moment and I&#39;m getting confused about where data volumes actually exist.

I&#39;m using **Docker Desktop for Windows**. (Windows 10)

In the docs they say that running docker inspect on the object will give you the source:https://docs.docker.com/engine/tutorials/dockervolumes/#locating-a-volume

    $ docker inspect web

    &quot;Mounts&quot;: [
        {
            &quot;Name&quot;: &quot;fac362...80535&quot;,
            &quot;Source&quot;: &quot;/var/lib/docker/volumes/fac362...80535/_data&quot;,
            &quot;Destination&quot;: &quot;/webapp&quot;,
            &quot;Driver&quot;: &quot;local&quot;,
            &quot;Mode&quot;: &quot;&quot;,
            &quot;RW&quot;: true,
            &quot;Propagation&quot;: &quot;&quot;
        }
    ]

however I don&#39;t see this, I get the following:

    $ docker inspect blog_postgres-data
    [
        {
            &quot;Driver&quot;: &quot;local&quot;,
            &quot;Labels&quot;: null,
            &quot;Mountpoint&quot;: &quot;/var/lib/docker/volumes/blog_postgres-data/_data&quot;,
            &quot;Name&quot;: &quot;blog_postgres-data&quot;,
            &quot;Options&quot;: {},
            &quot;Scope&quot;: &quot;local&quot;
        }
    ]

Can anyone help me? I just want to know where my data volume actually exists is it on my host machine? If so how can i get the path to it?

Locating data volumes in Docker Desktop (Windows)

I&#39;m trying to build my project locally using gitlab-runner on Linux. 

    docker-build:
      stage: build
      image: docker:latest
      script:
        - docker login -u &quot;gitlab-ci-token&quot; -p &quot;$CI_JOB_TOKEN&quot; $CI_REGISTRY # user &quot;gitlab-ci-token&quot; is automatically created by GitLab
        - docker build -t &quot;$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME&quot; target/
        - docker push &quot;$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME&quot;

Unfortunately my attempts end with error about &quot;docker login&quot; not being able to perform interactive login from non-TTY device.

    $ gitlab-ci-multi-runner exec docker --docker-privileged docker-build
    Running with gitlab-ci-multi-runner 1.11.1 (a67a225)
      on  ()
    Using Docker executor with image docker:latest ...
    Starting service docker:dind ...
    Pulling docker image docker:dind ...
    Waiting for services to be up and running...
    Pulling docker image docker:latest ...
    Running on runner--project-1-concurrent-0 via vanqyard...
    Cloning repository...
    Cloning into &#39;/builds/project-1&#39;...
    done.
    Checking out 70187b2d as docker-basic-conf...
    Skipping Git submodules setup
    Checking cache for docker-build/docker-basic-conf...
    Successfully extracted cache
    $ docker login -u &quot;gitlab-ci-token&quot; -p &quot;$CI_JOB_TOKEN&quot; $CI_REGISTRY
    Error: Cannot perform an interactive login from a non TTY device
    ERROR: Job failed: exit code 1
    FATAL: exit code 1 

                                

My question is has anybody stumbled upon this issue and how to succesfunlly perform build?

Gitlab-runner local build - login from non TTY device

I have a Dockerfile that is supposed to build an Ubuntu image. But whenever I run 

    docker build -t ubuntu-test:latest ./Dockerfile

it shows the following error on the console

&gt; unable to prepare context: context must be a directory: /Users/tempUser/git/docker/Dockerfile

I&#39;m on Mac OsX. I tried to `sudo` as well. Nothing works.


Docker build gives &quot;unable to prepare context: context must be a directory: /Users/tempUser/git/docker/Dockerfile&quot;

I am able to run arbitrary shell commands in a container created from docker/whalesay image.

    $ docker run docker/whalesay ls -l
    total 56
    -rw-r--r-- 1 root root  931 May 25  2015 ChangeLog
    -rw-r--r-- 1 root root  385 May 25  2015 INSTALL
    -rw-r--r-- 1 root root 1116 May 25  2015 LICENSE
    -rw-r--r-- 1 root root  445 May 25  2015 MANIFEST
    -rw-r--r-- 1 root root 1610 May 25  2015 README
    -rw-r--r-- 1 root root  879 May 25  2015 Wrap.pm.diff
    drwxr-xr-x 2 root root 4096 May 25  2015 cows
    -rwxr-xr-x 1 root root 4129 May 25  2015 cowsay
    -rw-r--r-- 1 root root 4690 May 25  2015 cowsay.1
    -rw-r--r-- 1 root root   54 May 25  2015 install.pl
    -rwxr-xr-x 1 root root 2046 May 25  2015 install.sh
    -rw-r--r-- 1 root root  631 May 25  2015 pgp_public_key.txt
    $ docker run docker/whalesay lsb_release -a
    No LSB modules are available.
    Distributor ID:	Ubuntu
    Description:	Ubuntu 14.04.2 LTS
    Release:	14.04
    Codename:	trusty

However, I am unable to run a shell in a container created from this image.

    $ docker run docker/whalesay bash
    $ docker ps
    CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
    $ docker ps -a
    CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                         PORTS               NAMES
    7ce600cc9904        docker/whalesay     &quot;bash&quot;                   5 seconds ago       Exited (0) 3 seconds ago                           loving_mayer

Why did it not work? How can I make it work?

How can I run bash in a new container of a docker image?

I am trying to run a [CentOS][1] 8 server through [VirtualBox][2] (6.1.30) ([Vagrant][3]), which worked just fine yesterday for me, but today I tried running a `sudo yum update`. I keep getting this error for some reason:

    [vagrant@192.168.38.4] ~  &gt;&gt; sudo yum update
    CentOS Linux 8 - AppStream                       71  B/s |  38  B     00:00
    Error: Failed to download metadata for repo &#39;appstream&#39;: Cannot prepare internal mirrorlist: No URLs in mirrorlist

I already tried to change the namespaces on `/etc/resolve.conf`, remove the [DNF][4] folders and everything. On other computers, this works just fine, so I think the problem is with my host machine. I also tried to reset the network settings (I am on a Windows&amp;nbsp;10 host), without success either. It&#39;s not a DNS problem; it works just fine.

After I reinstalled Windows, I still have the same error in my VM.

File *dnf.log*:

    2022-01-31T15:28:03+0000 INFO --- logging initialized ---
    2022-01-31T15:28:03+0000 DDEBUG timer: config: 2 ms
    2022-01-31T15:28:03+0000 DEBUG Loaded plugins: builddep, changelog, config-manager, copr, debug, debuginfo-install, download, generate_completion_cache, groups-manager, needs-restarting, playground, repoclosure, repodiff, repograph, repomanage, reposync
    2022-01-31T15:28:03+0000 DEBUG YUM version: 4.4.2
    2022-01-31T15:28:03+0000 DDEBUG Command: yum update
    2022-01-31T15:28:03+0000 DDEBUG Installroot: /
    2022-01-31T15:28:03+0000 DDEBUG Releasever: 8
    2022-01-31T15:28:03+0000 DEBUG cachedir: /var/cache/dnf
    2022-01-31T15:28:03+0000 DDEBUG Base command: update
    2022-01-31T15:28:03+0000 DDEBUG Extra commands: [&#39;update&#39;]
    2022-01-31T15:28:03+0000 DEBUG User-Agent: constructed: &#39;libdnf (CentOS Linux 8; generic; Linux.x86_64)&#39;
    2022-01-31T15:28:05+0000 DDEBUG Cleaning up.
    2022-01-31T15:28:05+0000 SUBDEBUG
    Traceback (most recent call last):
      File &quot;/usr/lib/python3.6/site-packages/dnf/repo.py&quot;, line 574, in load
        ret = self._repo.load()
      File &quot;/usr/lib64/python3.6/site-packages/libdnf/repo.py&quot;, line 397, in load
        return _repo.Repo_load(self)
    libdnf._error.Error: Failed to download metadata for repo &#39;appstream&#39;: Cannot prepare internal mirrorlist: No URLs in mirrorlist

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File &quot;/usr/lib/python3.6/site-packages/dnf/cli/main.py&quot;, line 67, in main
        return _main(base, args, cli_class, option_parser_class)
      File &quot;/usr/lib/python3.6/site-packages/dnf/cli/main.py&quot;, line 106, in _main
        return cli_run(cli, base)
      File &quot;/usr/lib/python3.6/site-packages/dnf/cli/main.py&quot;, line 122, in cli_run
        cli.run()
      File &quot;/usr/lib/python3.6/site-packages/dnf/cli/cli.py&quot;, line 1050, in run
        self._process_demands()
      File &quot;/usr/lib/python3.6/site-packages/dnf/cli/cli.py&quot;, line 740, in _process_demands
        load_available_repos=self.demands.available_repos)
      File &quot;/usr/lib/python3.6/site-packages/dnf/base.py&quot;, line 394, in fill_sack
        self._add_repo_to_sack(r)
      File &quot;/usr/lib/python3.6/site-packages/dnf/base.py&quot;, line 137, in _add_repo_to_sack
        repo.load()
      File &quot;/usr/lib/python3.6/site-packages/dnf/repo.py&quot;, line 581, in load
        raise dnf.exceptions.RepoError(str(e))
    dnf.exceptions.RepoError: Failed to download metadata for repo &#39;appstream&#39;: Cannot prepare internal mirrorlist: No URLs in mirrorlist
    2022-01-31T15:28:05+0000 CRITICAL Error: Failed to download metadata for repo &#39;appstream&#39;: Cannot prepare internal mirrorlist: No URLs in mirrorlist

  [1]: https://en.wikipedia.org/wiki/CentOS
  [2]: https://en.wikipedia.org/wiki/VirtualBox
  [3]: https://en.wikipedia.org/wiki/Vagrant_%28software%29
  [4]: https://en.wikipedia.org/wiki/DNF_(software)


Content Type	Original Author	Original Content on Stackoverflow
Question	shizhz	View Question on Stackoverflow
Solution 1 - Networking	thaJeztah	View Answer on Stackoverflow

Docker on CentOS 7.2: kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

Networking Problem Overview

Networking Solutions

Solution 1 - Networking

Why are some maven projects in IntelliJ grayed out?

How to fix this violation of this 'react/no-unescaped-entitie' of eslint rule?

Attributions