Created
May 24, 2016 22:00
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iscsi boot
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{ config, lib, pkgs, ... }: | |
with lib; | |
let | |
cfg = config.boot.initrd.iscsi; | |
fileSystems = attrValues config.fileSystems ++ config.swapDevices; | |
iscsiDevs = filter (dev: dev.iscsi.enable) fileSystems; | |
anyiscsi = fold (j: v: v || j.iscsi.enable) false iscsiDevs; | |
iscsiOptions = { | |
iscsi = { | |
enable = mkOption { default = false; type = types.bool; description = "The block device is backed by iscsi, adds this device as a initrd entry"; }; | |
host = mkOption { example = "192.168.2.61"; type = types.string; description = "the iscsi target"; }; | |
lun = mkOption { example = "iqn.2015-01.com.example:san.img"; type = types.string; description = "the LUN to connect"; }; | |
}; | |
}; | |
in | |
{ | |
options = { | |
fileSystems = mkOption { | |
options = [ iscsiOptions ]; | |
}; | |
swapDevices = mkOption { | |
options = [ iscsiOptions ]; | |
}; | |
boot.initrd.iscsi = { | |
initiatorName = mkOption { | |
example = "iqn.2015-09.com.example:3255a7223b2"; | |
type = types.string; | |
description = "the initiator name used when connecting"; | |
}; | |
netDev = mkOption { | |
example = "eth0"; | |
type = types.string; | |
description = "the network device the initrd will setup for iscsi"; | |
}; | |
}; # iscsi | |
}; # options | |
config = mkIf anyiscsi ( | |
let | |
ipAddress = config.networking.interfaces.${cfg.netDev}.ipAddress; | |
prefixLength = config.networking.interfaces.${cfg.netDev}.prefixLength; | |
defaultGateway = config.networking.defaultGateway; | |
in | |
{ | |
boot.initrd = { | |
kernelModules = [ "iscsi_tcp" ]; | |
availableKernelModules = [ "crc32c" ]; | |
extraUtilsCommands = '' | |
copy_bin_and_libs ${pkgs.openiscsi}/bin/iscsistart | |
''; | |
extraUtilsCommandsTest = '' | |
$out/bin/iscsistart -v | |
''; | |
preLVMCommands = '' | |
ip link set ${cfg.netDev} up | |
ip addr add ${ipAddress}/${toString prefixLength} dev ${cfg.netDev} | |
# todo, make this optional | |
ip route add via ${defaultGateway} dev ${cfg.netDev} | |
'' + concatMapStrings (dev: "iscsistart -t ${dev.iscsi.lun} -a ${dev.iscsi.host} -i ${config.boot.initrd.iscsi.initiatorName} -g 0\n") iscsiDevs; | |
}; # initrd | |
}); # config | |
} |
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