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| -rw-r--r-- | nixos/doc/manual/development/running-nixos-tests-interactively.section.md | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/nixos/doc/manual/development/running-nixos-tests-interactively.section.md b/nixos/doc/manual/development/running-nixos-tests-interactively.section.md index 54002941d63..a816213f37d 100644 --- a/nixos/doc/manual/development/running-nixos-tests-interactively.section.md +++ b/nixos/doc/manual/development/running-nixos-tests-interactively.section.md @@ -57,6 +57,22 @@ using: Once the connection is established, you can enter commands in the socat terminal where socat is running. +## Port forwarding to NixOS test VMs {#sec-nixos-test-port-forwarding} + +If your test has only a single VM, you may use e.g. + +```ShellSession +$ QEMU_NET_OPTS="hostfwd=tcp:127.0.0.1:2222-127.0.0.1:22" ./result/bin/nixos-test-driver +``` + +to port-forward a port in the VM (here `22`) to the host machine (here port `2222`). + +This naturally does not work when multiple machines are involved, +since a single port on the host cannot forward to multiple VMs. + +If the test defines multiple machines, you may opt to _temporarily_ set +`virtualisation.forwardPorts` in the test definition for debugging. + ## Reuse VM state {#sec-nixos-test-reuse-vm-state} You can re-use the VM states coming from a previous run by setting the |