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How to resolve docker failed to get d bus connection operation not permitted?

Today, let us discuss about the example scenarios explained by our Support Techs:

Example1:

When started off with docker pull CentOS image , create a container using docker run command , enter into a container using docker exec command.

Then, post updating yum repositories install the Apache on container.

While starting Apache to update the changes made.

Typically, error looks as shown below:

Failed to get D-Bus connection: Operation not permitted, Oh stuck !

• Firstly, docker pull

docker pull

• docker run

Setting up a preprod container(centos image) in an internal network i.e. dockernetwork and with capabilities to operate network related operations(- -cap-add=NET_ADMIN).

docker run

• docker exec

Jump onto the container using docker exec and install apache.

• The error

Finally, start apache and here is an error!

Failed to get D-Bus connection: Operation not permitted

Issue Rectification:

Below steps to be followed.

1. Modify earlier docker run command and pass /usr/sbin/init as command (CMD) that is to have systemd init processes support inside the container.

docker run

2. Now login onto the container and try installing and running apache , if success then well done else you might get an another error (as in my case) i.e. Error response from daemon: cgroups: cannot find cgroup mount destination: unknown.

Fail

IF response == FAIL

THEN

To rectify the last error , we need to modify default docker-machine environment setup and have to create and mount cgroup directory as a partition for systemd.

SSH into docker default machine

docker-machine ssh

Create & Mount

Mount

Retry

Retry the setup of container , installation of apache and try to start the httpd services, it should be success this time.

Start httpd

Success.

Example2:

After creating a container with a centos7 image, use systemctl to start the service and report an error.

# docker run -itd --name centos7 centos:7

# docker attach centos7

# yum install vsftpd

# systemctl start vsftpd

Failed to get D-Bus connection: Operation not permitted

solution:

Firstly,  stop the service of the originally created container and remove it

docker stop centos7

docker rm centos7

Run the container in privileged mode.

docker run -d --name centos7 --privileged=true centos:7 /usr/sbin/init

Enter the container:

docker exec -it centos7 /bin/bash

# yum install vsftpd

# systemctl start vsftpd

Analyze the reasons:

Docker’s design philosophy is not to run background services in the container.

The container itself is an independent main process on the host. It can also be indirectly understood as the application process that runs the service in the container.

The life cycle of a container revolves around the main process, so the correct way to use the container is to run the services inside it in the foreground.

systemd maintains a system service program, which requires privileges to access the Linux kernel.

And the container is not a complete operating system, only one file system, and the default startup is only for ordinary users to access the Linux kernel.

Therefore, please follow the container design principles and run a foreground service in a container!

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Conclusion

To sum up, our skilled Support Engineers at Bobcares demonstrated steps to resolve docker failed to get d bus connection operation not permitted