无法连接到位于 unix:/var/run/docker.sock 的 Docker 守护程序。 docker 守护程序是否正在运行？

Question

I have applied every solution available on inte.net but still I cannot run Docker.

I want to use Scrapy Splash on my server.

Here is history of commands I ran.

docker run -p 8050:8050 scrapinghub/splash
sudo docker run -p 8050:8050 scrapinghub/splash
sudo usermod -aG docker $(whoami)
sudo docker run -p 8050:8050 scrapinghub/splash
newgrp docker
sudo docker run -p 8050:8050 scrapinghub/splash
reboot
sudo docker run -p 8050:8050 scrapinghub/splash
docker run -p 8050:8050 scrapinghub/splash

You can see I tried to restart my server as well, but it didnt help.

see output of ps -aux | grep docker ps -aux | grep docker

root@mani:/var/www/html# ps aux | grep docker
root      8524  0.0  0.8 127904 13964 ?        Ssl  17:21   0:00 /usr/bin/dockerd --raw-logs
root      8534  0.0  0.3  90588  5012 ?        Ssl  17:21   0:00 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc
root      8543  0.0  0.0   8812   764 pts/1    S+   17:21   0:00 grep --color=auto docker
root     16356  0.0  0.0  17200   964 pts/1    S    17:14   0:00 newgrp docker
root     20080  0.0  0.0  17200   964 pts/1    S    17:06   0:00 newgrp docker
root     30221  0.0  0.0  17200   964 pts/1    S    17:09   0:00 newgrp docker

but it gives the error:

Cannot connect to the Docker daemon at unix:///var/run/docker.sock . Is the docker daemon running?.

Answer 1

You can try out this:

systemctl start docker

It worked fine for me.

PS: after if there is commands that you can't do without sudo, try this:

gpasswd -a $USER docker

Answer 2

Just Run

sudo dockerd

dockerd is the daemon service for docker containers, because it is not running in background we're not able to take any actions related to the service, which needs be restarted.

Answer 3

You can get this error if docker doesn't shut down cleanly. The following answer is for the docker snap package.

Run snap logs docker and look for the following:

Error starting daemon: pid file found, ensure docker is not running or delete /var/snap/docker/179/run/docker.pid

Deleting that file and restarting docker worked for me.

rm /var/snap/docker/<your-version-number>/run/docker.pid
snap stop docker
snap start docker

Make sure to replace ‍‍‍‍ <your-version-number>‍ with the appropriate version number.

Answer 4

I just hit this after doing a fresh install of DOCKER from the main docs. The problem for me was that immediately after the install, the service is not running.

These commands will help you to make sure docker is up and running for your run command to find it:

$ sudo service --status-all 
$ sudo service docker start
$ sudo service docker start

Answer 5

Easy way to fix this issue, try this

sudo su
systemctl start docker
systemctl enable docker
systemctl restart docker

Answer 6

First, try with sudo , as the current user may not have access permissions to communicate to docker daemon ie:

/var/run/docker.sock

If its still not working, then, after the installation, simply stop the docker daemon:

sudo service docker stop

And, run the following command to start the daemon in background:

sudo nohup docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

To make working with Docker easier, you should add your username to the Docker users group. Adding a user to the group can be done with the command below:

sudo usermod -aG docker $USER

Also, this step is mentioned in the official documentation of docker Post-installation steps for Linux.

Ubuntu 16.04 users can follow these steps:

Inside file /lib/systemd/system/docker.service change:

ExecStart=/usr/bin/dockerd fd://

to

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375

Inside file /etc/init.d/docker change:

DOCKER_OPTS=

to

DOCKER_OPTS="-H tcp://0.0.0.0:2375"

and then restart your machine, and start playing with docker.

Answer 7

I just simply forget running the Docker Desktop in my mac, after running Docker Desktop, you will be good to go.

Answer 8

This usually happened if you haven't stopped docker probably.

To resolve

service docker stop
cd /var/run/docker/libcontainerd
rm -rf containerd/*
rm -f docker-containerd.pid
service docker start

then "docker run...." to download your image and start the container as usual

Answer 9

It's worked for me:

sudo systemctl unmask docker
sudo systemctl start docker

Answer 10

这对我来说很好..！

service docker restart

Answer 11

我想如果您使用带有 GUI 的 WSL，那么您可以尝试

sudo /etc/init.d/docker start

Answer 12

I had this problem after closing docker while pulling a container:

docker pull mongo

At first I was getting weird errors so I purged docker:

sudo apt-get purge docker.io

and reinstalled:

sudo apt-get install docker.io

All of this did nothing; I couldn't even run the "hello-world" container.

The correct fix, for me at least was:

systemctl unmask docker.service
systemctl unmask docker.socket
systemctl start docker.service

After this I could pull mongo and run "hello world".

Answer 13

On Ubuntu 20.04 and Docker version 20.10.11,as a non root user, Running:

sudo service docker start

Then checking the status

sudo service docker status

Shows

* Docker is running

But trying any docker command such as

docker images

Shows the same error

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Running the below solves it

sudo service docker restart

Restart solved it, while start did not

Answer 14

I'm running on root and tried below, it worked:

service docker start

export DOCKER_HOST="tcp://0.0.0.0:2375"

Answer 15

It happens by the docker is not started yet.

Please check the docker status

$ sudo systemctl status docker

Then start and enable the docker and recheck the status

$ sudo systemctl start docker && sudo systemctl enable docker && sudo systemctl status docker

Thats it. Now the last step for checking the docker is working fine

$ sudo docker run hello-world

Answer 16

here's the solution which works for me on Linux

systemctl start docker .

Answer 17

for linux run

sudo dockerd

However, if you use Docker Client for mac it won't work. try the below code

$socat TCP-LISTEN:2376,reuseaddr,fork UNIX-CLIENT:/var/run/docker.sock

https://forums.docker.com/t/using-pycharm-docker-plugin-with-docker-beta/8617/9

That workaround opens port 2376 to the world... as TLS isn't enabled, this is a bad idea as anyone on the same network can hijack your docker daemon

Answer 18

I also received the error message below, after installing the docker and running: docker run hello-world #Cannot connect to the Docker daemon at unix: /var/run/docker.sock. Is the docker daemon running?

Here's a solution, what worked for me. Environment

• Windows 10 (Don't forget to enable on windows: Settings> Update and Security> Developer mode)
• Ubuntu 18.04 LTS
• Docker Desktop version 2.3.0.2 (45183)
  • Enable in Docker Desktop: Expose daemon on tcp: // localhost: 2375 without TLS
  • Docker Desktop must also be running (connected to Docker Hub ... just log in)

After installing ubuntu, update the repository

sudo apt-get update

To use a repository over HTTPS

sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common

Add the official Docker GPG key:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Make sure you now have the key with the fingerprint

sudo apt-key fingerprint 0EBFCD88

Update the repository

sudo apt-get update

Update the docker repository

sudo add-apt-repository "deb [arch = amd64] https://download.docker.com/linux/ubuntu $ (lsb_release -cs) stable "

Update the repository again

sudo apt-get update

Command to install the docker in version: 5: 18.09.9 ~ 3-0 ~ ubuntu-bionic

sudo apt-get install docker-ce = 5: 18.09.9 ~ 3-0 ~ ubuntu-bionic docker-ce-cli = 5: 18.09.9 ~ 3-0 ~ ubuntu-bionic containerd.io

Command to set the DOCKER_HOST

export DOCKER_HOST="tcp://0.0.0.0:2375"

Note: put the command above in your profile to start with the ubunto ex: echo "export DOCKER_HOST="tcp://0.0.0.0:2375"" >> ~/.bashrc

Add user to the docker group

sudo usermod -aG docker $USER

Restart ubuntu

(Close and open the ubuntu window again) or run:

source ~/.bashrc

Testing the installation (DO NOT use more sudo before docker commands (it will give an error), the user "root" has already been included in the docker group)

docker run hello-world

The message below should be displayed

Hello from Docker! This message shows that your installation appears to be working correctly.

Note: if it fails, run the command again:

export DOCKER_HOST="tcp://0.0.0.0:2375"

Reference: https://docs.docker.com/engine/install/ubuntu/ Session: INSTALL DOCKER ENGINE

#For other versions of the docker that can be installed with ubuntu, see the repository using the command below: apt-cache madison docker-ce

Then install the desired version of the docker:

sudo apt-get install docker-ce = <VERSION_STRING> docker-ce-cli = <VERSION_STRING> containerd.io

Answer 19

如果您使用的是 MAC，那么只需在 finder 中输入 docker，它就会自动解析。

Answer 20

Make sure information in this path /etc/docker/daemon.json

{
  "registry-mirror": [
    "https://registry.docker-cn.com"
  ],
  "insecure-registries": [
    "192.168.199.100:5000"
  ]
}

delete

"insecure-registries": [
    "192.168.199.100:5000"
]

and runs well enter image description here

Answer 21

I installed docker from snap repository. So I also had to start from snap (running Ubuntu).

sudo snap start docker

Otherwise you can also install it from their repositories .

Answer 22

2022 Solution

This work by my side:

Add the below in your volume:

volumes:
 - "/var/run/docker.sock:/var/run/docker.sock"

after that execute the below command

 sudo  chown 1000:1000 /var/run/docker.sock

Please note 1000 is the ID of the user. to know it execute the below command:

id

Answer 23

I was trying to run docker(just installed) in an instance of AWS when the message appears. I just write sudo service docker start and works fine for me.

Also see AWS with Docker

Answer 24

This exception comes when the service of docker is not running or the logged in user dont have the permission to access docker and generally it comes in RedHat

Using below command should resolve the issue

sudo service docker start

Answer 25

This works in my case:

sudo service docker start

Answer 26

I had the same problem for gitlab CI running node:lts image:

• I just restarted the docker daemon and restart the container, it worked for me.

Answer 27

在 ubuntu 中使用它 export DOCKER_HOST=tcp://localhost:2375

Answer 28

export DOCKER_HOST=tcp://localhost:2375 非常适合没有 sudo 访问权限且用户无权访问 unix:///var/run/docker.sock 的任何人

Answer 29

It could be related to no disk space left on the hard drive. Make sure you have space left on the device, Docker can't start up if there isn't any space left.

Answer 30

None of the current answers worked for my version of this error. I'm using the desktop version of Ubuntu 18. The following two commands fixed the issue.

sudo snap connect docker:home :home

sudo snap start docker

Answer 31

In root mode, run the command systemctl start docker

And afterwards, you can check the status by running systemctl status docker

Answer 32

I had this problem when docker was started after my terminal was started. Restarting the terminal or the process hosting the terminal (such as vscode) resolved the issue.

Answer 33

If you are trying to install docker with wsl 2 linux subsystem in windows, please read this document and check whether this command is executed:

wsl.exe --set-version (distro name) 2

and also check in your Windows OS docker->settings->Resources->Enable integration with additional distros: are checked on and restarted.

Answer 34

I faced same issue on Linux when I installed docker using yum (yum install docker).

Resolution: download docker binary from official site: docker install , unpack and follow the installation steps.

Answer 35

This might be a bit late for you but hope it will help someone find their way through the docker jungles. The problem might be coming from a tcp port binding issue verify if this file exists

/etc/systemd/system/docker.service.d

this is the default UNIX socket listening override file. The file might actauly be empty, but i find that the fact that it exists sometimes causes some headaches like what you faced. if it exists 1. then 2. if not just go straight to 2.

1. $ sudo rm -rf /etc/systemd/system/docker.service.d

2. $ sudo systemctl deamon-reload

I find that some of the recommendations here overlook the error being in the actual daemon failing to load

A good friend when playing with docker is

$ systemctl status docker.service

Answer 36

For those fresh installing & trying to running docker on RaspberryPi (RPi) like me, I needed to reboot my RPi 4B+ to resolve this issue and actually run the docker daemon.

By the time of writing this contribution this great manual does mention the necessity to reboot RPi, but only after setting "Non root-user to the Docker Group".

HTH, should someone miss this like me..

Answer 37

To me docker was really not running missing the following command to start it:

systemctl --user start docker-desktop

Answer 38

for me the cause of the error was docker desktop i had forced quit it. so restarting docker desktop worked for me and error got resolved.

Answer 39

on windows 11 with ubuntu 22 the command wsl.exe --update in power shell helped me to run docker through containerd as it was on windows 10

before that i was getting Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running which wasn't happend to me on windows 10 ubuntu 20.04 with the same set up.

starting with ordinary sudo service docker start

Answer 40

This worked for me, It might just work for you if you are using Ubuntu 16 or 18 (14 may also work). Easy to give a try:

Go to Ubuntu Software, type in Docker. Uninstall docker (108 mb) if it is preinstalled there. Install docker Now run the commands and see if the same error comes

The error:

After doing the above steps.

As you can see, it worked:)

Answer 41

For me the solution was to simply make sure I had installed the correct Docker package. For example, for Ubuntu the depreciated packages are:

• docker
• docker-engine
• docker.io
• containerd
• runc

For installation check https://docs.docker.com . Instructions are provided for Ubuntu , CentOS , Debian and Fedora at the time of writing.

Answer 42

For everyone who is having problems with Docker at the time of installation.

An error pointing to a failure in the docker service, do the commands below.

$ sudo apt update

$ sudo apt install apt-transport-https ca-certificates curl gnupg2 software-properties-common

$ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"

$ sudo apt update

$ apt-cache policy docker-ce

$ sudo apt install docker-ce

Answer 43

I had the same issue. In my case, VPN was the culprit. Turning off the VPN helped with the successful installation.

Answer 44

Just adding to the knowledge base. I found this video helpful. I do not have DOCKER_HOST defined. I do have a /etc/wsl.conf that has:

[automount]
root = /
options = "metadata"

After Restarting a few times docker hello-world worked.

Answer 45

I didn't see this solution mentioned, so I'll post it in case it might help someone. I was running into this error on my MacOS machine. The reason was that I had the DOCKER_HOST environment variable set in my dotfiles. Unsetting it through unset DOCKER_HOST did the trick. I found the tip in the official docker for Mac documentation: https://docs.docker.com/desktop/mac/troubleshoot/#workarounds-for-common-problems .

Answer 46

I read through all the answers and didn't find anything close to my situation. In the end, the problem turned out to be that docker was installed twice on my system, once on snap , and another time through the convenience script. So, if anybody runs into this problem, make sure to check that docker isn't installed in multiple places because that can cause some really weird behavior.

Answer 47

I am using Ubuntu 22.04. After doing a lot of research and going through lot of websites, I found that running docker as non root user is taking a different context. Using the below commands solved my issue..

docker context ls 

docker context use default 

Answer 48

On Ubuntu 22 "sudo service docker start" worked for me.

vikaspiprade@AUMEL-P7750-VP:~$ sudo docker run hello-world
docker: Cannot connect to the Docker daemon at 
unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.
vikaspiprade@AUMEL-P7750-VP:~$ sudo /var/run/docker.sock
sudo: /var/run/docker.sock: command not found
vikaspiprade@AUMEL-P7750-VP:~$ /var/run/docker.sock
-bash: /var/run/docker.sock: Permission denied
vikaspiprade@AUMEL-P7750-VP:~$ sudo service docker stop
* Docker already stopped - file /var/run/docker-ssd.pid not found.
vikaspiprade@AUMEL-P7750-VP:~$ sudo service docker start
* Starting Docker: docker                                                                                       
[ OK ]
vikaspiprade@AUMEL-P7750-VP:~$

Answer 49

I had this error message when I was not logged into Docker. Before more advanced troubleshooting, make sure you're logged into Docker. On mac, open the Docker Desktop app and sign in. This fixed the error for me.

Answer 50

make sure VPN in turned off when starting docker service

Answer 51

Docker.sock works as a channel to communicate between docker CLI and docker daemon. You can simply run your container by using this command.

docker run -v /var/run/docker.sock:/var/run/docker.sock  <ImageName>:latest

Answer 52

In my case when doing sudo dockerd --debug it showed this error: " failed to start daemon: Error initializing.network controller: error obtaining controller instance: failed to create NAT chain DOCKER: Iptables not found "

To solve it I put:

sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
sudo systemctl start docker.service

For more details you can check: https://forums.docker.com/t/failing-to-start-dockerd-failed-to-create-nat-chain-docker/78269

Answer 53

Assign Ownership to the Docker Unix Socket

The “cannot connect to the Docker daemon” error also happens if the Unix socket file for Docker doesn't have the correct ownership assigned.

1. Check ownership for the Docker Unix socket:

sudo ls -la /var/run/docker.sock

2. If necessary, grant the user ownership with:

sudo chown [username]:docker /var/run/docker.sock

Credits to Phonenixnap For answer

Answer 54

这个问题可以通过运行 1.systemctl enable docker 2.service docker start 永久解决

Answer 55

Use docker start <your_container_name>

Then connect to database by using mssql -u <yourUsername> -p <yourPassword>

If you get an error in the first step then the docker is running and go with the second step.

Note: I use Mac as my primary OS and this might be the same answer for Unix based OSs. If not! Sorry in advance.

Answer 56

Just restarting the system worked for me. It might be a temporary issue