$VIRTUAL_HOST

[gajeevan]

Creating and running a container behind nginx-proxy reverse proxy works perfect. docker run -e VIRTUAL_HOST=example.com.....

Is there any way to add to the $VIRTUAL_HOST variable on a running container? export VIRTUAL_HOST=example.com,example1.com.....work within in the container but does not hold after rebooting the container?

Is there any other way to tackle this issue with having to:
commit -> save -> load -> and then do a new docker run

Thanks in advance for any help!

[thaJeztah]

First, the save/load step should not be required (docker commit already commits your containers to a new image).

Currently, environment variables (and labels) in docker are immutable; you can change an environment variable inside the container, but "on the outside", the value doesn't change (docker inspect <my-container> will still show the value that was set when creating the container).

I don't think there's anything nginx-proxy can do about that, unless docker will support making changes on a running container (which is still being discussed, but not sure if that will be supported).

In general, a container should be stateless and should not contain changes. Any changes in a container you want to persist, should be stored in a volume, so that you are able to remove / upgrade / replace a container without loosing anything.

[gajeevan]

The problem with my docker commit command is that when I was cleaning up my container folder I accident might have erased a folder that was dependant. The container works just fine, the server can be rebooted.

[root@CA3JMCSDOCKER01 ~]# docker commit 777c52344bb7

FATA[0005] Error response from daemon: Driver devicemapper failed to create image rootfs 09d761bf1049e61f8fcfb2057eeff20d26a91c0ff72977a86e495f03517a9f85: Unknown device 3bf975ba7b0ecb6561a2c0a8f0c6995745c815feb600597a5d8a7e47b082892d

I am not sure what to make of it. How do I go about creating a volume in docker? Is there a specific docker hub volume container that you recommend.....or

Do I use a specific folder on the desktop and then share it as a volume use the "-v" express when starting a container?

[thaJeztah]

I think this page covers all about volumes; https://docs.docker.com/userguide/dockervolumes/

[tkw1536]

Resolved by previous comment. Please open a a discussion if you still have questions.