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|
{ pkgs, ... }:
let
backend =
{ config, pkgs, ... }:
{
services.openssh.enable = true;
services.httpd.enable = true;
services.httpd.adminAddr = "foo@example.org";
services.httpd.documentRoot = "${pkgs.valgrind}/share/doc/valgrind/html";
};
in
{
nodes =
{ proxy =
{ config, pkgs, nodes, ... }:
{
services.httpd.enable = true;
services.httpd.adminAddr = "bar@example.org";
services.httpd.extraModules = ["proxy_balancer"];
services.httpd.extraConfig =
''
ExtendedStatus on
<Location /server-status>
Order deny,allow
Allow from all
SetHandler server-status
</Location>
<Proxy balancer://cluster>
Allow from all
BalancerMember http://${nodes.backend1.config.networking.hostName} retry=0
BalancerMember http://${nodes.backend2.config.networking.hostName} retry=0
</Proxy>
ProxyStatus full
ProxyPass /server-status !
ProxyPass / balancer://cluster/
ProxyPassReverse / balancer://cluster/
# For testing; don't want to wait forever for dead backend servers.
ProxyTimeout 5
'';
};
backend1 = backend;
backend2 = backend;
client = { config, pkgs, ... }: { };
};
testScript =
''
startAll;
$proxy->waitForUnit("httpd");
$backend1->waitForUnit("httpd");
$backend2->waitForUnit("httpd");
# With the back-ends up, the proxy should work.
$client->succeed("curl --fail http://proxy/");
$client->succeed("curl --fail http://proxy/server-status");
# Block the first back-end.
$backend1->block;
# The proxy should still work.
$client->succeed("curl --fail http://proxy/");
$client->succeed("curl --fail http://proxy/");
# Block the second back-end.
$backend2->block;
# Now the proxy should fail as well.
$client->fail("curl --fail http://proxy/");
# But if the second back-end comes back, the proxy should start
# working again.
$backend2->unblock;
$client->succeed("curl --fail http://proxy/");
'';
}
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