Re: Connect to IOC in container from another host in different network, via CA Gateway

["Knap, Giles \(DLSLtd,RAL,LSCI\) via Tech-talk" <tech-talk at aps.anl.gov>]

I should have mentioned that you can't do the same with PVAccess. UDP traffic will not get through to the container - using EPICS_PVA_NAME_SERVERS to point at the container host does work as it uses TCP. This can be a list of PVA servers but would not scale well if you had many PVA servers.

The alternative that does work for PVA and CA is to put all your IOCs in the host network and then you don't need any gateways.

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From: Gonzalez, Jose Carlos <jose.carlos.gonzalez at ipp.mpg.de>
Sent: 28 March 2025 16:28
To: Knap, Giles (DLSLtd,RAL,LSCI) <giles.knap at diamond.ac.uk>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: Connect to IOC in container from another host in different network, via CA Gateway

 

Great, thanks a lot! 

I will have a look and let you know. BTW, I got both mails, also the one with the image 😊

Cheers,

J C

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From: Knap, Giles (DLSLtd,RAL,LSCI) <giles.knap at diamond.ac.uk>
Sent: 28 March 2025 15:57:59
To: tech-talk at aps.anl.gov; Gonzalez, Jose Carlos
Subject: Re: Connect to IOC in container from another host in different network, via CA Gateway

 

Hi Jose,

(resending without the image that was too big for techtalk!)

I usually make my simulation beamline in containers only accessible from the local machine. However by binding the cagateway ports to all interfaces I can also make the PVs accessible to the subnet.

The example project is here https://github.com/epics-containers/example-services/tree/local-subnet-access

The changes to make PVs available is here https://github.com/epics-containers/example-services/blob/2e9a905edf61946223079b71728c7165df6ea4d4/services/gateway/compose.yml#L21-L29

Regards,

giles

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