rexray
how to I use the CLI to mount a volume as read-only?
@jdef Can you describe how you are using dvdcli? Is it in combination with the mesos-module-dvdi? Currently mount options are not configurable.
In the case of using it with Mesos, this could be something that is added as a volume option. It would be respected during the bind mount into the container that Mesos starts.
More information about how you are using it would help steer the conversation.
the use case I had in mind was mounting the same "shared" vol instance on multiple hosts as RO. so they'd be mounted on each host as RO and also mounted in each container as RO
On Thu, Mar 17, 2016 at 3:16 PM, Clinton Kitson [email protected] wrote:
@jdef https://github.com/jdef Can you describe how you are using dvdcli? Is it in combination with the mesos-module-dvdi? Currently mount options are not configurable.
In the case of using it with Mesos, this could be something that is added as a volume option. It would be respected during the bind mount into the container that Mesos starts.
More information about how you are using it would help steer the conversation.
— You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub https://github.com/emccode/dvdcli/issues/15#issuecomment-198042328
James DeFelice 585.241.9488 (voice) 650.649.6071 (fax)
@jdef long time! I am part of the emc {code} team working on this. Anyway, the dvdi-module ultimately mounts the vol on the container using Docker's plugin api underneath. Right now, there's no option to enforce readonly in Docker volume plugin, therefore, there's no way to enforce this.
Keep in mind this project is the dvdicli, there's also the mesos-dvdi-module which works as a mesos module to do volume management - https://github.com/emccode/mesos-module-dvdi.
Let us know if you have more questions.
Hi Vladimir! I had started digging through the docker code to check whether this was possible, but was side-tracked. You've answered that question for me. I haven't played around very much with these drives on the docker command line but it seems strange that Docker would mount something on the host as RW if I specified something like -v myVolName:/path/in/container:ro. But I can think of situations where RW mounting on the host, and then binding w/ RO in a container is useful as well. Probably need to think about our (future) use cases some more.
Any way, even if RO isn't supported at the host level I think it makes sense as something to support at the container level - and that sounds like a feature for the mesos module.
On Mon, Mar 21, 2016 at 6:07 PM, Vladimir Vivien [email protected] wrote:
@jdef https://github.com/jdef long time! I am part of the emc {code} team working on this. Anyway, the dvdi-module ultimately mounts the vol on the container using Docker's plugin api underneath. Right now, there's no option to enforce readonly in Docker volume plugin, therefore, there's no way to enforce this.
Keep in mind this project is the dvdicli, there's also the mesos-dvdi-module which works as a mesos module to do volume management - https://github.com/emccode/mesos-module-dvdi.
Let us know if you have more questions.
— You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub https://github.com/emccode/dvdcli/issues/15#issuecomment-199509623
James DeFelice 585.241.9488 (voice) 650.649.6071 (fax)