Uninterruptible power supply: Difference between revisions

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 * upsmon.conf, set how upsmon should react to status changes, power.ups.upsmon.settings section
 * delayed UPS shutdown systemd unit, to make Restore Power on AC Return BIOS option functional, systemd.services.nut-delayed-ups-shutdown section
+= Declare UPS units =
+Corresponds to file ups.conf
+<syntaxhighlight lang="nix">
+  power.ups = {
+    enable = true;
+    mode = "standalone";
+    # section: The upsd UPS declarations: ups.conf
+    # this UPS device is named UPS-1.
+    ups."UPS-1" = {
+      description = "Eaton Ellipse ECO 650 with 12V 7Ah Batt";
+      # driver name from https://networkupstools.org/stable-hcl.html
+      driver = "usbhid-ups";
+      # usbhid-ups driver always use value "auto"
+      port = "auto";
+      directives = [
+        # "Restore power on AC" BIOS option needs power to be cut a few seconds to work;
+        # this is achieved by the offdelay and ondelay directives.
+        # in the last stages of system shutdown, "upsdrvctl shutdown" is called to tell UPS that
+        # after offdelay seconds, the UPS power must be cut, even if
+        # wall power returns.
+        "offdelay = 60"
+        # UPS power is now cut regardless of wall power.  After (ondelay minus offdelay) seconds,
+        # if wall power returns, turn on UPS power.  The system has now been disconnected for a minimum of (ondelay minus offdelay) seconds,
+        # "Restore power on AC" should now power on the system.
+        # For reasons described above, ondelay value must be larger than offdelay value.
+        "ondelay = 70"
+        # set value for battery.charge.low,
+        # upsmon initiate shutdown once this threshold is reached.
+        "lowbatt = 40"
+      ];
+    };
+</syntaxhighlight>
+= Declare upsd listening ports =
+Corresponds to file upsd.conf.  This file declares which ports the upsd daemon will listen to.
+<syntaxhighlight lang="nix">
+  power.ups = {
+    # section: The upsd daemon access control; upsd.conf
+    upsd = {
+      listen = [
+        {
+          address = "127.0.0.1";
+          port = 3493;
+        }
+        {
+          address = "::1";
+          port = 3493;
+        }
+      ];
+    };
+   };
+</syntaxhighlight>
+= Declare users with access to UPS =
+Corresponds to file upsd.users.  This file declares a virtual user (not related to /etc/passwd users) with write access to UPS.  A password is also declared.
+<syntaxhighlight lang="nix">
+  power.ups = {
+    # section: Users that can access upsd. The upsd daemon user
+    # declarations. upsd.users
+    users."nut-admin" = {
+      passwordFile = ../resources/ups-passwd.txt;
+      upsmon = "primary";
+    };
+   };
+</syntaxhighlight>
+= Connect upsmon to upsd =
+Corresponds to upsmon.conf.  This file declares how upsmon should connect to upsd
+<syntaxhighlight lang="nix">
+  power.ups = {
+    # section: The upsmon daemon configuration: upsmon.conf
+    upsmon.monitor."UPS-1" = {
+      system = "UPS-1@localhost";
+      powerValue = 1;
+      user = "nut-admin";
+      passwordFile = ../resources/ups-passwd.txt;
+      type = "primary";
+    };
+   };
+</syntaxhighlight>
+= Declare how upsmon should react to status changes =
+Corresponds to upsmon.conf.  This file declares how upsmon is to handle NOTIFY events.
+<syntaxhighlight lang="nix">
+  power.ups = {
+    upsmon.settings = {
+      # This configuration file declares how upsmon is to handle
+      # NOTIFY events.
+      # POWERDOWNFLAG and SHUTDOWNCMD is provided by NixOS default
+      # values
+      # values provided by ConfigExamples 3.0 book
+      NOTIFYMSG = [
+        [ "ONLINE" ''"UPS %s: On line power."'' ]
+        [ "ONBATT" ''"UPS %s: On battery."'' ]
+        [ "LOWBATT" ''"UPS %s: Battery is low."'' ]
+        [ "REPLBATT" ''"UPS %s: Battery needs to be replaced."'' ]
+        [ "FSD" ''"UPS %s: Forced shutdown in progress."'' ]
+        [ "SHUTDOWN" ''"Auto logout and shutdown proceeding."'' ]
+        [ "COMMOK" ''"UPS %s: Communications (re-)established."'' ]
+        [ "COMMBAD" ''"UPS %s: Communications lost."'' ]
+        [ "NOCOMM" ''"UPS %s: Not available."'' ]
+        [ "NOPARENT" ''"upsmon parent dead, shutdown impossible."'' ]
+      ];
+      NOTIFYFLAG = [
+        [ "ONLINE" "SYSLOG+WALL" ]
+        [ "ONBATT" "SYSLOG+WALL" ]
+        [ "LOWBATT" "SYSLOG+WALL" ]
+        [ "REPLBATT" "SYSLOG+WALL" ]
+        [ "FSD" "SYSLOG+WALL" ]
+        [ "SHUTDOWN" "SYSLOG+WALL" ]
+        [ "COMMOK" "SYSLOG+WALL" ]
+        [ "COMMBAD" "SYSLOG+WALL" ]
+        [ "NOCOMM" "SYSLOG+WALL" ]
+        [ "NOPARENT" "SYSLOG+WALL" ]
+      ];
+      # every RBWARNTIME seconds, upsmon will generate a replace
+      # battery NOTIFY event
+      RBWARNTIME = 216000;
+      # every NOCOMMWARNTIME seconds, upsmon will generate a UPS
+      # unreachable NOTIFY event
+      NOCOMMWARNTIME = 300;
+      # after sending SHUTDOWN NOTIFY event to warn users, upsmon
+      # waits FINALDELAY seconds long before executing SHUTDOWNCMD
+      # Some UPS's don't give much warning for low battery and will
+      # require a value of 0 here for aq safe shutdown.
+      FINALDELAY = 0;
+    };
+   };
+</syntaxhighlight>