I have setup an overlay network and everything works as expected except when I was trying to look at the overlay network namespace. Here is the problem: [image] Can anyone shed some light?

I’ll try to answer my own question. Solution: Comment out the line “MountFlags=slave” in /etc/systemd/system/multi-user.target.wants/docker.service Why: With “MountFlags=slave” set, the systemd mounts the process’s root filesystem as “ MS_SLAVE ” which means any newly mounted filesystems within th…

You are welcome. Glad that I could help.

Hi @baiwang , I am using CoreOS and playing with Docker Swarm. I have the same issue but in my case the docker.service file is inside /usr/lib64/systemd/system/. I am not able to edit the file, even with sudoedit. Any idea on how I could enter the namespace?

On how to customize docker.service, here is the coreos official document: https://coreos.com/os/docs/latest/customizing-docker.html . Please read the Enabling the Docker debug flag part, just replace add the -D flag part with comment out MountFlags=slave will work. Hope it helps.

There is another way around this, without having to modify the service. Use a double nsenter command to first enter the docker daemon’s mount namespace, then enter the network namespace from there. E.g., in my case, 35633 is the pid of the docker daemon. [root@docker3 ~]# nsenter -m -t 35633 nsent…

Unable to check Docker overlay network namespace

General

weiranmsft (Weiranmsft) August 4, 2016, 9:21am 3

I had the same issue, and tried your solution. it works. Thank you very much.

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Unable to check Docker overlay network namespace

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