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let
pkgs = import ./channel.nix;
foo_project = import foo/default.nix;
main_service = cmd: {
wantedBy = [ "multi-user.target" ]; # Specify that the system wants this service to run.
after = [ "network.target" ]; # Start the webserver after the network has come up.
serviceConfig = {
ExecStart = cmd;
User = "nobody";
};
};
blue_config = {
foo_port = 8080;
};
green_config = {
foo_port = 8081;
};
all_configs = [blue_config green_config];
host_nat_configuration = {
enable = true;
internalInterfaces = ["ve-+"];
externalInterface = "eth0";
forwardPorts = [
{ destination = "$foo_blue:${toString blue_config.foo_port}"; sourcePort = blue_config.foo_port; }
{ destination = "$foo_green:${toString green_config.foo_port}"; sourcePort = green_config.foo_port; } ];
};
foo_container = config : {
environment.systemPackages = [foo_project];
networking.firewall.allowedTCPPorts = [config.foo_port];
systemd.services.foo = main_service "${foo_project}/bin/run ${toString config.foo_port}";
};
in
{
network.description = "Foo Service";
network.enableRollback = true;
foo = { config, pkgs, ... }: {
networking.firewall.allowedTCPPorts = map (x: x.foo_port) all_configs;
networking.nat = host_nat_configuration;
};
foo_blue = foo_container blue_config;
foo_green = foo_container green_config;
}
let
region = "eu-west-1";
accessKeyId = "dev"; # symbolic name looked up in ~/.ec2-keys
ec2 = { resources, ... } : {
deployment.targetEnv = "ec2";
deployment.ec2.accessKeyId = accessKeyId;
deployment.ec2.region = region;
deployment.ec2.instanceType = "m1.small";
deployment.ec2.keyPair = resources.ec2KeyPairs.my-key-pair;
deployment.ec2.securityGroups = [ "staging-server" ];
};
container_in = host : { resources, ... } : {
deployment.targetEnv = "container";
deployment.container.host = __getAttr host resources.machines;
deployment.encryptedLinksTo = [host];
};
in
{
foo = ec2;
foo_blue = container_in "foo";
foo_green = container_in "foo";
# Provision an EC2 key pair.
resources.ec2KeyPairs.my-key-pair =
{ inherit region accessKeyId; };
}
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