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cadviser: add storageDriverPasswordFile option

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This gives users the option of storing the storageDriverPassword outside the
world-readable Nix store.
This commit is contained in:
Bas van Dijk 2017-03-26 00:44:53 +01:00
parent 79f9544eca
commit 2030a91f58
1 changed files with 59 additions and 28 deletions
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87
nixos/modules/services/monitoring/cadvisor.nix
View file

@ -54,7 +54,29 @@ in {
storageDriverPassword = mkOption {
default = "root";
type = types.str;
description = "Cadvisor storage driver password.";
description = ''
Cadvisor storage driver password.
Warning: this password is stored in the world-readable Nix store. It's
recommended to use the <option>storageDriverPasswordFile</option> option
since that gives you control over the security of the password.
<option>storageDriverPasswordFile</option> also takes precedence over <option>storageDriverPassword</option>.
'';
};
storageDriverPasswordFile = mkOption {
type = types.str;
description = ''
File that contains the cadvisor storage driver password.
<option>storageDriverPasswordFile</option> takes precedence over <option>storageDriverPassword</option>
Warning: when <option>storageDriverPassword</option> is non-empty this defaults to a file in the
world-readable Nix store that contains the value of <option>storageDriverPassword</option>.
It's recommended to override this with a path not in the Nix store.
Tip: use <link xlink:href='https://nixos.org/nixops/manual/#idm140737318306400'>nixops key management</link>
'';
};
storageDriverSecure = mkOption {
@ -65,35 +87,44 @@ in {
};
};
config = mkIf cfg.enable {
systemd.services.cadvisor = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" "docker.service" "influxdb.service" ];
config = mkMerge [
{ services.cadvisor.storageDriverPasswordFile = mkIf (cfg.storageDriverPassword != "") (
mkDefault (toString (pkgs.writeTextFile {
name = "cadvisor-storage-driver-password";
text = cfg.storageDriverPassword;
}))
);
}
postStart = mkBefore ''
until ${pkgs.curl.bin}/bin/curl -s -o /dev/null 'http://${cfg.listenAddress}:${toString cfg.port}/containers/'; do
sleep 1;
done
'';
(mkIf cfg.enable {
systemd.services.cadvisor = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" "docker.service" "influxdb.service" ];
serviceConfig = {
ExecStart = ''${pkgs.cadvisor}/bin/cadvisor \
-logtostderr=true \
-listen_ip=${cfg.listenAddress} \
-port=${toString cfg.port} \
${optionalString (cfg.storageDriver != null) ''
-storage_driver ${cfg.storageDriver} \
-storage_driver_user ${cfg.storageDriverHost} \
-storage_driver_db ${cfg.storageDriverDb} \
-storage_driver_user ${cfg.storageDriverUser} \
-storage_driver_password ${cfg.storageDriverPassword} \
${optionalString cfg.storageDriverSecure "-storage_driver_secure"}
''}
postStart = mkBefore ''
until ${pkgs.curl.bin}/bin/curl -s -o /dev/null 'http://${cfg.listenAddress}:${toString cfg.port}/containers/'; do
sleep 1;
done
'';
TimeoutStartSec=300;
};
};
virtualisation.docker.enable = mkDefault true;
};
script = ''
exec ${pkgs.cadvisor}/bin/cadvisor \
-logtostderr=true \
-listen_ip="${cfg.listenAddress}" \
-port="${toString cfg.port}" \
${optionalString (cfg.storageDriver != null) ''
-storage_driver "${cfg.storageDriver}" \
-storage_driver_user "${cfg.storageDriverHost}" \
-storage_driver_db "${cfg.storageDriverDb}" \
-storage_driver_user "${cfg.storageDriverUser}" \
-storage_driver_password "$(cat "${cfg.storageDriverPasswordFile}")" \
${optionalString cfg.storageDriverSecure "-storage_driver_secure"}
''}
'';
serviceConfig.TimeoutStartSec=300;
};
virtualisation.docker.enable = mkDefault true;
})
];
}