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doc/VirtualMachine.md: document env overrides for add-serial

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Pragmatic Software 2022-02-10 16:37:39 -08:00
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doc/VirtualMachine.md
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@ -120,6 +120,8 @@ Now, while the virtual machine is rebooting, switch to a terminal on your host s
`applets/compiler_vm/host/devices` directory and run the `add-serials` script to add the `serial-2.xml` and
`serial-3.xml` files to the configuration for the `pbot-vm` libvirt machine.
host$ add-serials
This will enable the `/dev/ttyS1` and `/dev/ttyS2` serial ports in the guest and connect them
to the following TCP addresses on the host: `127.0.0.1:5555` and `127.0.0.1:5556`,
respectively. `ttyS1/5555` is the data channel used to send commands or code to the
@ -127,7 +129,12 @@ virtual machine and to read back output. `ttyS2/5556` is simply a newline sent e
5 seconds, representing a heartbeat, used to ensure that the PBot communication
channel is healthy.
If you want to change the serial ports or the TCP ports, execute the command
You may use the `PBOTVM_DOMAIN`, `PBOTVM_SERIAL` and `PBOTVM_HEART` environment variables to override
the default values. To use ports `7777` and `7778` instead:
host$ PBOTVM_SERIAL=7777 PBOTVM_HEART=7778 add-serials
If you later want to change the serial ports or the TCP ports, execute the command
`virsh edit pbot-vm` on the host. This will open the `pbot-vm` XML configuration
in your default system editor. Find the `<serial>` tags and edit their attributes.