Re: PVA and Docker on Mac

[Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>]

On 7/27/22 02:25, Juan F. Esteban Müller via Tech-talk wrote:
> Hello all,
>
> I am trying to run a PVA client on Docker, but when I run the image on macOS I can’t connect to any IOC, while from Linux it works fine. There are some differences in how the Docker network interface works on Linux and macOS, but I couldn’t find a way to solve this issue.
Container networking remains a persistent problem...

Thinks to check, *both* in the container and in the host.

* Network settings: "ifconfig" or "ip link && ip addr" or whatever apple provides

Make sure that both ends have the correct broadcast address.

* Firewall settings:  "iptables-save" and/or "nft list all" or whatever apple provides


Things to try from the client end:

* Connect directly to the TCP port (5075 or whatever softIocPVA prints)

eg. if available "telnet <hostip> 5075" is easy.  "netcat" / "nc" can also do this.
Or a short python script.

* Setup UDP unicast search: EPICS_PVA_ADDR_LIST=<hostip>


If you have PVXS installed, then pvxvct may be helpful.
(although no more so than eg. wireshark)

https://mdavidsaver.github.io/pvxs/cli.html#troubleshooting-with-virtual-cable-tester


> The issue is limited to PV Access, CA works fine.
>
> In case someone wants to reproduce the issue, I am attaching a db file and a Dockerfile and these are the steps:
>
>  1. Run the IOC on the host machine: $ softIocPVA -d count.db
>  2. Build the Docker image: $ docker build -t pvatest .
>  3. Run the Docker image: $ docker run pvatest
>
> On Linux you’ll get something like this:
>
> $ docker run pvatest
>
> ../iocinf.cpp: Parsing 'EPICS_CA_ADDR_LIST'
>
> Bad internet address or host name: 'host.docker.internal'
>
> counter89
>
> counter 2022-07-27 09:05:26.71489
>
> While on macOS this:
>
> % docker run pvatest
>
> counter90
>
> counter Timeout
>
> The first line from the output is the cagetcommand, the second one is pvget.
>
> Best regards,
>
> Juan