Author: eelco
Date: Thu Apr 28 13:39:42 2011
New Revision: 27032
URL: https://svn.nixos.org/websvn/nix/?rev=27032&sc=1
Log:
* Start of the next-gen, cloud-enabled nixos-deploy-network :-)
Added:
cloud/trunk/examples/
cloud/trunk/examples/apache.nix
cloud/trunk/src/
cloud/trunk/src/eval-machine-info.nix
cloud/trunk/src/nixos-deploy-network.pl
Added: cloud/trunk/examples/apache.nix
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ cloud/trunk/examples/apache.nix Thu Apr 28 13:39:42 2011 (r27032)
@@ -0,0 +1,55 @@
+let
+
+ backend =
+ { config, pkgs, ... }:
+
+ {
+ services.openssh.enable = true;
+
+ services.httpd.enable = true;
+ services.httpd.adminAddr = "[email protected]";
+ services.httpd.documentRoot = "${pkgs.valgrind}/share/doc/valgrind/html";
+ };
+
+in
+
+{
+
+ proxy =
+ { config, pkgs, nodes, ... }:
+
+ {
+ services.httpd.enable = true;
+ services.httpd.adminAddr = "[email protected]";
+ services.httpd.extraModules = ["proxy_balancer"];
+
+ services.httpd.extraConfig =
+ ''
+ ExtendedStatus on
+
+ <Location /server-status>
+ Order deny,allow
+ Allow from all
+ SetHandler server-status
+ </Location>
+
+ <Proxy balancer://cluster>
+ Allow from all
+ BalancerMember http://${nodes.backend1.config.networking.hostName}
retry=0
+ BalancerMember http://${nodes.backend2.config.networking.hostName}
retry=0
+ </Proxy>
+
+ ProxyStatus full
+ ProxyPass /server-status !
+ ProxyPass / balancer://cluster/
+ ProxyPassReverse / balancer://cluster/
+
+ # For testing; don't want to wait forever for dead backend servers.
+ ProxyTimeout 5
+ '';
+ };
+
+ backend1 = backend;
+ backend2 = backend;
+
+}
Added: cloud/trunk/src/eval-machine-info.nix
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ cloud/trunk/src/eval-machine-info.nix Thu Apr 28 13:39:42 2011
(r27032)
@@ -0,0 +1,22 @@
+{ nixpkgs ? builtins.getEnv "NIXPKGS_ALL"
+, nixos ? builtins.getEnv "NIXOS"
+, system ? builtins.currentSystem
+, networkExpr
+}:
+
+with import "${nixos}/lib/testing.nix" { inherit nixpkgs system; };
+with pkgs;
+
+rec {
+ x = complete { nodes = import networkExpr; testScript = ""; };
+
+ machineInfo = builtins.attrNames (x.nodes);
+
+ machines = runCommand "vms" {}
+ ''
+ mkdir -p $out
+ ${toString (lib.attrValues (lib.mapAttrs (n: v: ''
+ ln -s ${v.config.system.build.vm} $out/${n}
+ '') x.nodes))}
+ '';
+}
Added: cloud/trunk/src/nixos-deploy-network.pl
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ cloud/trunk/src/nixos-deploy-network.pl Thu Apr 28 13:39:42 2011
(r27032)
@@ -0,0 +1,117 @@
+#! /var/run/current-system/sw/bin/perl -w
+
+use XML::LibXML;
+
+my $networkExpr;
+my @machines = ();
+my $outPath;
+
+
+sub main {
+ # Parse the command line.
+ processArgs();
+
+ # Evaluate the user's network specification to determine machine
+ # names and the desired deployment characteristics.
+ evalMachineInfo();
+
+ # Read the state file to obtain info about previously started VMs.
+ readState();
+
+ # Create missing VMs.
+ startMachines();
+
+ # Evaluate and build each machine configuration locally.
+ buildConfigs();
+
+ # Copy the closures of each machine configuration to the
+ # corresponding target machine.
+ copyClosures();
+
+ # Activate the new configuration on each machine, and do a
+ # rollback if any fails.
+ activateConfigs();
+}
+
+
+sub processArgs {
+ $networkExpr = $ARGV[0];
+ die unless defined $networkExpr;
+}
+
+
+sub evalMachineInfo {
+ my $machineInfoXML =
+ `nix-instantiate --eval-only --xml --strict ./eval-machine-info.nix
--argstr networkExpr $networkExpr -A machineInfo`;
+ die "evaluation of $networkExpr failed" unless $? == 0;
+
+ #print $machineInfoXML, "\n";
+
+ my $dom = XML::LibXML->load_xml(string => $machineInfoXML);
+ foreach my $m ($dom->findnodes('/expr/list/string')) {
+ my $name = $m->findvalue('./@value');
+ #print STDERR "got machine ‘$name’\n";
+ push @machines, { name => $name };
+ }
+}
+
+
+sub readState {
+}
+
+
+sub startMachines {
+ foreach my $machine (@machines) {
+ print STDERR "checking whether VM ‘$machine->{name}’ exists...\n";
+
+ my $ipv6 = `ssh root\@stan.nixos.org query-vm $machine->{name} 2>
/dev/null`;
+ die "unable to query VM state: $?" unless $? == 0 || $? == 256;
+
+ if ($? == 256) {
+ print STDERR "starting missing VM ‘$machine->{name}’...\n";
+ system "ssh root\@stan.nixos.org create-vm $machine->{name}";
+ die "unable to start VM: $?" unless $? == 0;
+
+ $ipv6 = `ssh root\@stan.nixos.org query-vm $machine->{name} 2>
/dev/null`;
+ die "unable to query VM state: $?" unless $? == 0;
+ }
+
+ chomp $ipv6;
+
+ print STDERR "IPv6 address is $ipv6\n";
+
+ print STDERR "checking whether VM ‘$machine->{name}’ is reachable via
SSH...\n";
+
+ system "ssh -o StrictHostKeyChecking=no root\@$ipv6 true < /dev/null
2> /dev/null";
+ die "cannot SSH to VM: $?" unless $? == 0;
+
+ $machine->{ipv6} = $ipv6;
+ }
+}
+
+
+sub buildConfigs {
+ print STDERR "building all machine configurations...\n";
+ $outPath = `nix-build ./eval-machine-info.nix --argstr networkExpr
$networkExpr -A machines`;
+ die "unable to build all machine configurations" unless $? == 0;
+ chomp $outPath;
+}
+
+
+sub copyClosures {
+ # !!! Should copy closures in parallel.
+ foreach my $machine (@machines) {
+ print STDERR "copying closure to machine ‘$machine->{name}’...\n";
+ my $systemPath = readlink "$outPath/$machine->{name}/system" or die;
+ system "nix-copy-closure --gzip --to root\@$machine->{ipv6}
$systemPath";
+ die "unable to copy closure to machine ‘$machine->{name}’" unless $?
== 0;
+ }
+}
+
+
+sub activateConfigs {
+ # TODO
+}
+
+
+main;
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