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nixos/prometheus: require one alertmanager configuration parameter

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This commit adds an assertion that checks that either `configFile` or
`configuration` is configured for alertmanager. The alertmanager config
can not be an empty attributeset. The check executed with `amtool` fails
before the service even has the chance to start. We should probably not
allow a broken alertmanager configuration anyway.

This also introduces a test for alertmanager configuration that piggy
backs on the existing prometheus tests.
This commit is contained in:
Andreas Rammhold 2018-11-04 19:27:43 +01:00
parent b1032db5a9
commit 51c3082119
2 changed files with 53 additions and 23 deletions
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54
nixos/modules/services/monitoring/prometheus/alertmanager.nix
View File

@ -57,8 +57,8 @@ in {
};
configuration = mkOption {
type = types.attrs;
default = {};
type = types.nullOr types.attrs;
default = null;
description = ''
Alertmanager configuration as nix attribute set.
'';
@ -136,26 +136,34 @@ in {
};
};
config = mkIf cfg.enable {
networking.firewall.allowedTCPPorts = optional cfg.openFirewall cfg.port;
systemd.services.alertmanager = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
script = ''
${cfg.package}/bin/alertmanager \
${concatStringsSep " \\\n " cmdlineArgs}
'';
serviceConfig = {
User = cfg.user;
Group = cfg.group;
Restart = "always";
PrivateTmp = true;
WorkingDirectory = "/tmp";
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
config = mkMerge [
(mkIf cfg.enable {
assertions = singleton {
assertion = cfg.configuration != null || cfg.configText != null;
message = "Can not enable alertmanager without a configuration. "
+ "Set either the `configuration` or `configText` attribute.";
};
};
};
})
(mkIf cfg.enable {
networking.firewall.allowedTCPPorts = optional cfg.openFirewall cfg.port;
systemd.services.alertmanager = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
script = ''
${cfg.package}/bin/alertmanager \
${concatStringsSep " \\\n " cmdlineArgs}
'';
serviceConfig = {
User = cfg.user;
Group = cfg.group;
Restart = "always";
PrivateTmp = true;
WorkingDirectory = "/tmp";
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
};
};
})
];
}

22
nixos/tests/prometheus.nix
View File

@ -13,6 +13,25 @@ import ./make-test.nix {
}];
}];
rules = [ ''testrule = count(up{job="prometheus"})'' ];
# a very simple version of the alertmanager configuration just to see if
# configuration checks & service startup are working
alertmanager = {
enable = true;
listenAddress = "[::1]";
port = 9093;
configuration = {
route.receiver = "webhook";
receivers = [
{
name = "webhook";
webhook_configs = [
{ url = "http://localhost"; }
];
}
];
};
};
};
};
};
@ -22,5 +41,8 @@ import ./make-test.nix {
$one->waitForUnit("prometheus.service");
$one->waitForOpenPort(9090);
$one->succeed("curl -s http://127.0.0.1:9090/metrics");
$one->waitForUnit("alertmanager.service");
$one->waitForOpenPort("9093");
$one->succeed("curl -f -s http://localhost:9093/");
'';
}