Docker linux permission denied

How to Fix Docker Permission Denied Error on Ubuntu

Recently, I installed Docker on Ubuntu. It was super easy. But when I tried to run a docker command, it threw this error at me:

It’s not that I am trying to run something special. It happens for basic docker command like ps as well.

Strange, isn’t it? Let me show you how to get past this annoying error.

Fixing ‘Got permission denied while trying to connect to the Docker daemon socket’ error with Docker in Ubuntu

There are two ways to deal with it.

Fix 1: Run all the docker commands with sudo

If you have sudo access on your system, you may run each docker command with sudo and you won’t see this ‘Got permission denied while trying to connect to the Docker daemon socket’ anymore.

But running each and every docker command with sudo is super inconvenient. You miss adding sudo to the beginning and you’ll get ‘permission denied’ error again.

Fix 2: Running docker commands without sudo

To run the docker commands without sudo, you can add your user account (or the account you are trying to fix this problem for) to the docker group.

First, create the docker group using groupadd command. The group may already exist but running the group creation command won’t hurt.

Now that you have the docker group, add your user to this group with the usermod command. I am assuming that you are trying to do it for your own user account and in that case, you can use the $USER variable.

Verify that your user has been added to docker group by listing the users of the group. You probably have to log out and log in back again.

If you check your groups and docker groups is not listed even after logging out, you may have to restart Ubuntu. To avoid that, you can use the newgrp command liks this:

Now if you try running the docker commands without sudo, it should work just fine.

Further troubleshooting

In some cases, you may need to add additional permissions to some files specially if you have run the docker commands with sudo in the past.

You may try changing the group ownership of the /var/run/docker.sock file.

You may also try changing the group ownership of the

And then try running docker with sudo. It should be fine.

I hope this little tutorial helped you to fix the annoying “Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.39/containers/json: dial unix /var/run/docker.sock: connect: permission denied” error with Docker in Ubuntu.

Did it fix the problem for you? If yes, I welcome a quick comment of thanks from you. If not, I’ll be happy to help you fix this problem further.

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getting permission denied in docker run

I am trying using Docker using Dockerfile.

My Dockerfile as follows, where I am using debian linux system.

So when I run docker build -t test . , it build without problem.

However, when I run docker run -p 8080:8080 test .

It throws following error:

What is I am doing wrong ?

3 Answers 3

You need to change the permission of the bash file by chmod +x entrypoint.sh before calling ENTRYPOINT. So change your code to the following:

Rebuild the image and run the container, it should work.

I changed the location of the entrypoint in the dockerfolder and rebuild & it worked!

Since COPY copies files including their metadata, you can also simply change the permissions of the file in the host machine (the one building the Docker image):

Then, when running docker build -t test . the copied file will have the execution permission and docker run -p 8080:8080 test should work.

Obs.: I’m not advocating this as best practice, but still, it works.

Not the answer you’re looking for? Browse other questions tagged docker or ask your own question.

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Why does docker container prompt «Permission denied»?

I use following command to run a docker container, and map a directory from host( /root/database ) to container( /tmp/install/database ):

But in container, I find I can’t use ls to list contents in /tmp/install/database/ though I am root and have all privileges:

I check /root/database in host, and all things seem OK:

Why does docker container prompt «Permission denied»?

Update:
The root cause is related to SELinux . Actually, I met similar issue last year.

4 Answers 4

A permission denied within a container for a shared directory could be due to the fact that this shared directory is stored on a device. By default containers cannot access any devices. Adding the option $docker run —privileged allows the container to access all devices and performs Kernel calls. This is not considered as secure.

A cleaner way to share device is to use the option docker run —device=/dev/sdb (if /dev/sdb is the device you want to share).

From the man page:

I had a similar issue when sharing an nfs mount point as a volume using docker-compose. I was able to resolve the issue with:

Eventhough you found the issue, this may help someone else.

Another reason is a mismatch with the UID/GID. This often shows up as being able to modify a mount as root but not as the containers user

You can set the UID, so for an ubuntu container running as ubuntu you may need to append :uid=1000 (check with id -u ) or set the UID locally depending on your use case.

Set the owner and group of the files in the filesystem (default: uid=gid=0)

There is a good blog about it here with this tmpfs example

man docker-run gives the proper answer:

Labeling systems like SELinux require that proper labels are placed on volume content mounted into a container. Without a label, the security system might prevent the processes running inside the container from using the content. By default, Docker does not change the labels set by the OS.

To change a label in the container context, you can add either of two suffixes :z or :Z to the volume mount. These suffixes tell Docker to relabel file objects on the shared volumes. The z option tells Docker that two containers share the volume content. As a result, Docker labels the content with a shared content label. Shared volume labels allow all containers to read/write content. The Z option tells Docker to label the content with a private unshared label. Only the current container can use a private volume.

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docker.sock permission denied

When I try to run simple docker commands like:

I get an error message:

Got permission denied . /var/run/docker.sock: connect: permission denied

When I check permissions with

I see this line:

So, I follow an advice from many forums and add local user to docker group:

But it does not help. I still get the very same error message. How can I fix it?

10 Answers 10

For those new to the shell, the command:

needs to have $USER defined in your shell. This is often there by default, but you may need to set the value to your login id in some shells.

Changing the groups of a user does not change existing logins, terminals, and shells that a user has open. To avoid performing a login again, you can simply run:

to get access to that group in your current shell.

Once you have done this, the user effectively has root access on the server, so only do this for users that are trusted with unrestricted sudo access.

Reason: The error message means that the current user can’t access the docker engine, because the user hasn’t enough permissions to access the UNIX socket to communicate with the engine.

Quick Fix:

Run the command as root using sudo.

Change the permissions of /var/run/docker.sock for the current user.

Caution: Running sudo chmod 777 /var/run/docker.sock will solve your problem but it will open the docker socket for everyone which is a security vulnerability as pointed out by @AaylaSecura. Hence it shouldn’t be used, except for testing purposes on the local system.

Permanent Solution:

Add the current user to the docker group.

Note: You have to log out and log in again for the changes to take effect.

Refer to this blog to know more about managing Docker as a non-root user.

Make sure your $USER variable is set

logout

Upon login, restart the docker service

As mentioned earlier in the comment the changes won’t apply until your re-login. If you were doing a SSH and opening a new terminal, it would have worked in new terminal

But since you were using GUI and opening the new terminal the changes were not applied. That is the reason the error didn’t go away

So below command did do its job, its just a re-login was missed

As my user is and AD user, I have to add the AD user to the local group by manually editing /etc/group file. Unforrtunately the adduser commands do not seem to be nsswitch aware and do not recognize a user not locally defined when adding someone to a group.

Then reboot or refresh /etc/group. Now, you can use docker without sudo.

bash into container as root user docker exec -it —user root bash

create docker group if it’s not already created groupadd -g 999 docker

add user to docker group usermod -aG docker jenkins

change permissions chmod 777 /var/run/docker.sock

When I try to run simple docker commands like: $ docker ps -a

I get an error message: Got permission denied . /var/run/docker.sock: connect: permission denied .

TL;DR: There are two ways (the first one, also mentioned in the question itself, was extensively addressed by other answers, but comes with security concerns; so I’ll elaborate on this issue, and develop the second solution that can also be applicable for this fairly sensible use case).

Just to recall the context, the Docker daemon socket is owned by root:docker :

so with this default setup, one needs to prepend all docker CLI commands by sudo .

To avoid this, one can either:

add one’s user account ( $USER ) to the docker group − but that’s quite risky to do this on one’s personal workstation, as this would amount to provide all programs run by the user with root permissions without any sudo password prompt nor auditing.

one can otherwise prepend sudo automatically without typing sudo docker manually: to this aim, a solution consists in adding the following alias in the

/.bashrc (see e.g. this thread for details):

Then one can test this by opening a new terminal and typing:

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How to fix docker: Got permission denied while trying to connect to the Docker daemon socket

I’ve just installed docker but I have to run it with sudo every time. If I don’t add sudo I get the following error:

Is there a way around that? I want to be able to run docker without having to type my password each time..

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just open terminal and type this command

sudo chmod 666 /var/run/docker.sock

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

According to the official Docker docs here:

You need to do the following:

To create the docker group and add your user:

• Create the docker group.

• Add your user to the docker group.

• You would need to loog out and log back in so that your group membership is re-evaluated or type the following command:

• Verify that you can run docker commands without sudo.

This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

If you initially ran Docker CLI commands using sudo before adding your user to the docker group, you may see the following error, which indicates that your

/.docker/ directory was created with incorrect permissions due to the sudo commands.

To fix this problem, either remove the

/.docker/ directory (it is recreated automatically, but any custom settings are lost), or change its ownership and permissions using the following commands:

Here’s also a quick video demo on how to do this:

Hope that this helps!
Regards,
Bobby

I also had to restart the docker daemon to get things working:

hello,pls i having the permission denied… issue applying your solution and getting to this step ‘su -s $’, its asking me for a password: . which the only password i can think of is my laptop password and inputting that . it says su: Authentication failure.
pls i dont know what is wrong, this is my first time using the docker

The password su $ requires you is the one for $USER , which will expand to the current user. You might as well just log out and log in again.

I think the author meant su $ not su -s $ , since -s is used to specify a shell.

The root account is disabled by default in Ubuntu, so there is no root password, that’s why su fails with an authentication error.

Use sudo to become root:

After an upgrade I got the permission denied. Doing the steps of ‘mkb’ post install steps don’t have change anything because my user was already in the ‘docker’ group; I retry-it twice any way without success.

After an search hour this following solution finaly worked :

I was struggling with this issue for more than couple of weeks trying all other methods. Finally this only solved my issue. Thanks alot !!

I struggled a lot and then stumbled upon this one. Thank you so much it worked like a charm.

I think there are two different scenarios, new installs, and upgrades.

This one did it for me, thanks for tracking it down.

Thanks *sagarjethi *to share this.

thanks this worked

Thanks a lot! it helped right away.

7 years after the initial release docker is still super user-unfriendly

After installing Docker and restarting computer this permission change was only thing that helped. As after install and before restart everything worked just fine around Docker.

Thanks, It works for me.

Thanks a lot sagarjethi ! this worked for me

Thank you. this solve my issue in ubuntu 18.04 droplet

Thank you very much! This one worked for me too. \o/

Thanks a lot. worked for me.

Thanks a lot, it’s worked for me.

Thanks ! This solved my problem.

Thanks a lot. worked for me.

this one saved my day, thanks @sagarjethi !

I was struggling to figure out the issue. This answer really helped.

Thank you so much

Thank you sagarjethi. Your contribution has saved my two-day run to troubleshoot this issue. Stay Awesome.

This solution worked for me. Thanks a lot man!

Thanks a lot, it worked.
I was executing docker run hello-world from Jenkins

While doing production config i got the permission issue.I tried below solution to resolve the issue.

Error Message**

Solution:permissions of the socket indicated in the error message, /var/run/docker.sock:

After changes permission for docket.sock then execute below command to check permissions.

can’t help but ask how many of you have simply run

after adding your id to the docker group? It works as expected. In many cases you may find the primary user group vs additional groups may be an impacting condition in how the scripts and code works.

Got this permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/version: dial unix /var/run/docker.sock: connect: permission denied

Solution: as a non-root user run he below commands.

$ sudo groupadd docker
$ sudo usermod -aG docker $USER
$ newgrp docker

Actually I missed this command($ newgrp docker)… after running it worked like a cham. Thanks to “rondemena”. Changing permissions i didn’t think so it is a correct option.

I, personaly, did add my username to the docker group and set my current group to docker. After that, the situation remains unchanged, event after a system restart. Sagarjethi’s work around worked well form me, as I was abe to pull the dedired image from the repository. Although I am still unable to make docker login command working. Is this command of any use in such a case?
I will just add that, whatever the docker command I issue succeed or not, there has never been any .docker subdirectory in the home directory of the users I use. This is clearly an anomaly, but I found no way to fix this, nor in Docker documentation, nor in the various forums I searched into.

Maybe Docker is working fine, but, as for too many softwares, the documentation is not clear on all these basic subjects.

My configuration is Ubuntu 20.04 and Docker version 20.10.7, build f0df350.

The above is almost right, but opens up a security gap that let’s everyone get access to docker.sock

Instead of sudo chmod 666 /var/run/docker.sock which opens it to everyone, enter

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

That way root still has it’s connection with docker but anyone in the docker group gets access too.

Thanks for pointing that out @Brianlmerritt — looks like @bobbyiliev has incorporated your change into his answer.

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