Re: Connection to PVA server fails despite server

["Wlodek, Jakub via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Michael,

Thanks for the quick response - I was able to figure out what the problem was based on a hint in your

message:

I'm interested to know if you see the CONNECTION_VALIDATION messages
being exchanged.  There should be one from server to client (telnet
shows this), which should be followed by another from client to server.
You will see your user account name in the body of this one.

If all were going well, the server would then respond with CONNECTION_VALIDATED.
But since both ends are timing out, presumably this isn't happening.

You mentioned that my user account name would be transmitted during the connection validation stage.

Since I am running the IOC inside of a docker container, the default account it runs under is root, however,

I wanted data saved by the container to be owned by the softioc user we use across all our IOC servers

at NSLS2. As a result I configured the container to run the IOC as the softioc user imported from

the host server. When I disabled this, and ran the IOC process as root, everything seemed to work.

When I connected to the container from the outside, it appeared that the `softioc` name was not retained, only the uid and gid,

and I got a prompt like this:

I have no name!@xf17bm-ioc2:/$

Ultimately, I added a command in the Dockerfile to add the softioc user and just manually matched the uid and gid with the

external user - and now everything seems to work, as the proper user. If you don't mind me asking, why is seemingly only

PVA affected by the no-name user issue, but not CA?

Thanks again,

Jakub

---

From: Michael Davidsaver <mdavidsaver at gmail.com>
Sent: Tuesday, November 10, 2020 1:44 PM
To: Wlodek, Jakub <jwlodek at bnl.gov>
Cc: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: Connection to PVA server fails despite server

 

On 11/10/20 9:28 AM, Wlodek, Jakub via Tech-talk wrote:
> Hi all,
>
> I am currently working with an areaDetector IOC I am running in a container,

I should also ask for the usual information about software versions.
Which version(s) of EPICS Base and other modules are involved?