Experimental Physics and
Industrial Control System

Hello Dale, hello Florian,

many thanks for your helpful advises. Now I could solve the issue simply by adding "network_mode: host" to the service "epicsbase".

Now my working docker-compose.yml  looks like:

Hi, Carsten!

I didn't suggest using "network_mode: host" because earlier you had mentioned that you had already tried using EPICS_CA_ADDR_LIST inside the container; so the effect of being unable to enumerate interfaces in order to find the broadcast addresses shouldn't have impacted you... What did you try setting it to? It should have been the IP address of the host serving external_pv, and it should work with or without "network_mode: host", AFAIK.

services:
    epicsbase:
       image: softioc
       container_name: epicsbase
       volumes:
          - ./epicsbase/db:/usr/local/db
       working_dir: /usr/local/epics
       command:
          - /bin/sh
          - -c
          - |
          echo start first Soft IOC
          screen -d -m /usr/local/epics/epics-base/bin/linux-x86_64/softIoc -D /usr/local/epics/epics-base/dbd/softIoc.dbd -d /usr/local/db/test.db
          tail -f /dev/null # keep alive

       network_mode: host

Best regards
Carsten

--------------------Ursprüngliche Nachricht--------------------
Von: Carsten Winkler <carsten.winkler at helmholtz-berlin.de>
Gesendet: Montag 25. März 2024 14:55
An: tech-talk at aps.anl.gov
Betreff: How can I get a PV from an external server from inside a docker container?

Hello,

I have 3 SoftIOCs.
    1.) local host       = 193.100.100.100 with PV: "local_pv"
    2.) external host  = 192.200.200.200 with PV: "external_pv"
    3.) docker container    on local host   with PV: "docker_pv"

From local host I can read all PVs (caget local_pv external_pv docker_pv). 👍
From inside the docker container I can read the local_pv and the docker_pv
but not the external_pv. 🤔

Here is my docker compose configuration:

services:
    epicsbase:
       image: softioc
       container_name: epicsbase
       volumes:
          - ./epicsbase/db:/usr/local/db
       working_dir: /usr/local/epics
       command:
          - /bin/sh
          - -c
          - |
          echo start first Soft IOC
          screen -d -m /usr/local/epics/epics-base/bin/linux-x86_64/softIoc -D /usr/local/epics/epics-base/dbd/softIoc.dbd -d /usr/local/db/test.db
          tail -f /dev/null # keep alive
       networks:
          - ioc-net
networks:
    ioc-net:

From inside the docker container I have also already tried EPICS_CA_AUTO_ADDR_LIST / EPICS_CA_ADDR_LIST. Unfortunately without success.
With and without these environment variables I only get the local_pv and the docker_pv.

How can I also read the external_pv from inside the docker container?

Best regards
Carsten

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References:

How can I get a PV from an external server from inside a docker container? Carsten Winkler via Tech-talk

Re: How can I get a PV from an external server from inside a docker container? Carsten Winkler via Tech-talk

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