Experimental Physics and Industrial Control System
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Hello Carsten,
We run a couple of EPICS services in docker containers at NEXT, so hopefully this is helpful. I don't think we have any docker IOC's, but we run the archivers dockerized, which use channel access. If I'm not mistaken - the initial connection when an IOC advertises is done via broadcast. Docker overlay networks don't pass on broadcast traffic by default. So we had to find a way to allow that initial handshake to happen. We created a macvlan network on the docker host, which will pass on broadcasts. https://docs.docker.com/network/drivers/macvlan/So after creating the macvlan network shown in the above link, the relevant docker-compose section would reference that network. You can see that our archive engine has it's own IP address:
--- services: archive-engine: ... networks: epics: ipv4_address: 10.0.0.2
...
networks: epics: external: true name: epics_macvlan
---
That's what we did anyway, and my archive engine is able to span 2 different networks and talk to iocs, as well as write data to the database on a different network.
Dale 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
-- Dale Cox Instrumentation and Electrical Engineer ACU NEXT Lab
- References:
- How can I get a PV from an external server from inside a docker container? Carsten Winkler via Tech-talk
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ANJ, 25 Mar 2024 |
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