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|
{ pkgs, lib, ... }:
let
addrShared = "192.168.0.1";
addrHostA = "192.168.0.10";
addrHostB = "192.168.0.11";
mkUcarpHost =
addr:
{
config,
pkgs,
lib,
...
}:
{
networking.interfaces.eth1.ipv4.addresses = lib.mkForce [
{
address = addr;
prefixLength = 24;
}
];
networking.ucarp = {
enable = true;
interface = "eth1";
srcIp = addr;
vhId = 1;
passwordFile = "${pkgs.writeText "ucarp-pass" "secure"}";
addr = addrShared;
upscript = pkgs.writeScript "upscript" ''
#!/bin/sh
${pkgs.iproute2}/bin/ip addr add "$2"/24 dev "$1"
'';
downscript = pkgs.writeScript "downscript" ''
#!/bin/sh
${pkgs.iproute2}/bin/ip addr del "$2"/24 dev "$1"
'';
};
};
in
{
name = "ucarp";
meta.maintainers = [ ];
nodes = {
hostA = mkUcarpHost addrHostA;
hostB = mkUcarpHost addrHostB;
};
testScript = ''
def is_master(host):
ipOutput = host.succeed("ip addr show dev eth1")
return "inet ${addrShared}/24" in ipOutput
start_all()
# First, let both hosts start and let a master node be selected
for host, peer in [(hostA, "${addrHostB}"), (hostB, "${addrHostA}")]:
host.wait_for_unit("ucarp.service")
host.succeed(f"ping -c 1 {peer}")
hostA.sleep(5)
hostA_master, hostB_master = is_master(hostA), is_master(hostB)
assert hostA_master != hostB_master, "only one master node is allowed"
master_host = hostA if hostA_master else hostB
backup_host = hostB if hostA_master else hostA
# Let's crash the master host and let the backup take over
master_host.crash()
backup_host.sleep(5)
assert is_master(backup_host), "backup did not take over"
'';
}
|
