nixos/iscsi/root-initiator: init
Co-authored-by: Graham Christensen <graham@floxdev.com>
This commit is contained in:
ajs124
Graham Christensen
parent
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commit
47598c476a
2 changed files with 182 additions and 0 deletions
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@ -692,6 +692,7 @@
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./services/networking/iperf3.nix
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./services/networking/ircd-hybrid/default.nix
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./services/networking/iscsi/initiator.nix
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./services/networking/iscsi/root-initiator.nix
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./services/networking/iscsi/target.nix
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./services/networking/iwd.nix
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./services/networking/jicofo.nix
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181
nixos/modules/services/networking/iscsi/root-initiator.nix
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181
nixos/modules/services/networking/iscsi/root-initiator.nix
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@ -0,0 +1,181 @@
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{ config, lib, pkgs, ... }: with lib;
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let
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cfg = config.boot.iscsi-initiator;
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in
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{
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# If you're booting entirely off another machine you may want to add
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# this snippet to always boot the latest "system" version. It is not
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# enabled by default in case you have an initrd on a local disk:
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#
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# boot.initrd.postMountCommands = ''
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# ln -sfn /nix/var/nix/profiles/system/init /mnt-root/init
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# stage2Init=/init
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# '';
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#
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# Note: Theoretically you might want to connect to multiple portals and
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# log in to multiple targets, however the authors of this module so far
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# don't have the need or expertise to reasonably implement it. Also,
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# consider carefully before making your boot chain depend on multiple
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# machines to be up.
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options.boot.iscsi-initiator = with types; {
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name = mkOption {
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description = ''
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Name of the iSCSI initiator to boot from. Note, booting from iscsi
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requires networkd based networking.
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'';
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default = null;
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example = "iqn.2020-08.org.linux-iscsi.initiatorhost:example";
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type = nullOr str;
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};
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discoverPortal = mkOption {
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description = ''
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iSCSI portal to boot from.
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'';
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default = null;
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example = "192.168.1.1:3260";
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type = nullOr str;
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};
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target = mkOption {
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description = ''
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Name of the iSCSI target to boot from.
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'';
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default = null;
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example = "iqn.2020-08.org.linux-iscsi.targethost:example";
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type = nullOr str;
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};
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logLevel = mkOption {
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description = ''
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Higher numbers elicits more logs.
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'';
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default = 1;
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example = 8;
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type = int;
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};
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loginAll = mkOption {
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description = ''
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Do not log into a specific target on the portal, but to all that we discover.
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This overrides setting target.
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'';
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type = bool;
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default = false;
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};
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extraConfig = mkOption {
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description = "Extra lines to append to /etc/iscsid.conf";
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default = null;
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type = nullOr lines;
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};
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extraConfigFile = mkOption {
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description = ''
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Append an additional file's contents to `/etc/iscsid.conf`. Use a non-store path
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and store passwords in this file. Note: the file specified here must be available
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in the initrd, see: `boot.initrd.secrets`.
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'';
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default = null;
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type = nullOr str;
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};
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};
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config = mkIf (cfg.name != null) {
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# The "scripted" networking configuration (ie: non-networkd)
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# doesn't properly order the start and stop of the interfaces, and the
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# network interfaces are torn down before unmounting disks. Since this
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# module is specifically for very-early-boot network mounts, we need
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# the network to stay on.
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#
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# We could probably fix the scripted options to properly order, but I'm
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# not inclined to invest that time today. Hopefully this gets users far
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# enough along and they can just use networkd.
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networking.useNetworkd = true;
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networking.useDHCP = false; # Required to set useNetworkd = true
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boot.initrd = {
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network.enable = true;
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# By default, the stage-1 disables the network and resets the interfaces
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# on startup. Since our startup disks are on the network, we can't let
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# the network not work.
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network.flushBeforeStage2 = false;
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kernelModules = [ "iscsi_tcp" ];
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extraUtilsCommands = ''
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copy_bin_and_libs ${pkgs.openiscsi}/bin/iscsid
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copy_bin_and_libs ${pkgs.openiscsi}/bin/iscsiadm
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${optionalString (!config.boot.initrd.network.ssh.enable) "cp -pv ${pkgs.glibc.out}/lib/libnss_files.so.* $out/lib"}
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mkdir -p $out/etc/iscsi
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cp ${config.environment.etc.hosts.source} $out/etc/hosts
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cp ${pkgs.openiscsi}/etc/iscsi/iscsid.conf $out/etc/iscsi/iscsid.fragment.conf
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chmod +w $out/etc/iscsi/iscsid.fragment.conf
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cat << 'EOF' >> $out/etc/iscsi/iscsid.fragment.conf
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${optionalString (cfg.extraConfig != null) cfg.extraConfig}
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EOF
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'';
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extraUtilsCommandsTest = ''
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$out/bin/iscsiadm --version
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'';
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preLVMCommands = let
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extraCfgDumper = optionalString (cfg.extraConfigFile != null) ''
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if [ -f "${cfg.extraConfigFile}" ]; then
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printf "\n# The following is from ${cfg.extraConfigFile}:\n"
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cat "${cfg.extraConfigFile}"
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else
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echo "Warning: boot.iscsi-initiator.extraConfigFile ${cfg.extraConfigFile} does not exist!" >&2
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fi
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'';
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in ''
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${optionalString (!config.boot.initrd.network.ssh.enable) ''
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# stolen from initrd-ssh.nix
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echo 'root:x:0:0:root:/root:/bin/ash' > /etc/passwd
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echo 'passwd: files' > /etc/nsswitch.conf
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''}
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cp -f $extraUtils/etc/hosts /etc/hosts
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mkdir -p /etc/iscsi /run/lock/iscsi
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echo "InitiatorName=${cfg.name}" > /etc/iscsi/initiatorname.iscsi
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(
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cat "$extraUtils/etc/iscsi/iscsid.fragment.conf"
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printf "\n"
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${optionalString cfg.loginAll ''echo "node.startup = automatic"''}
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${extraCfgDumper}
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) > /etc/iscsi/iscsid.conf
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iscsid --foreground --no-pid-file --debug ${toString cfg.logLevel} &
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iscsiadm --mode discoverydb \
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--type sendtargets \
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--discover \
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--portal ${escapeShellArg cfg.discoverPortal} \
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--debug ${toString cfg.logLevel}
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${if cfg.loginAll then ''
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iscsiadm --mode node --loginall all
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'' else ''
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iscsiadm --mode node --targetname ${escapeShellArg cfg.target} --login
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''}
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pkill -9 iscsid
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'';
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};
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services.openiscsi = {
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enable = true;
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inherit (cfg) name;
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};
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assertions = [
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{
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assertion = cfg.loginAll -> cfg.target == null;
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message = "iSCSI target name is set while login on all portals is enabled.";
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}
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];
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};
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}
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