372 lines
13 KiB
Nix
372 lines
13 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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ceph = pkgs.ceph;
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cfg = config.services.ceph;
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# function that translates "camelCaseOptions" to "camel case options", credits to tilpner in #nixos@freenode
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translateOption = replaceStrings upperChars (map (s: " ${s}") lowerChars);
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generateDaemonList = (daemonType: daemons: extraServiceConfig:
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mkMerge (
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map (daemon:
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{ "ceph-${daemonType}-${daemon}" = generateServiceFile daemonType daemon cfg.global.clusterName ceph extraServiceConfig; }
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) daemons
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)
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);
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generateServiceFile = (daemonType: daemonId: clusterName: ceph: extraServiceConfig: {
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enable = true;
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description = "Ceph ${builtins.replaceStrings lowerChars upperChars daemonType} daemon ${daemonId}";
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after = [ "network-online.target" "local-fs.target" "time-sync.target" ] ++ optional (daemonType == "osd") "ceph-mon.target";
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wants = [ "network-online.target" "local-fs.target" "time-sync.target" ];
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partOf = [ "ceph-${daemonType}.target" ];
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wantedBy = [ "ceph-${daemonType}.target" ];
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serviceConfig = {
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LimitNOFILE = 1048576;
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LimitNPROC = 1048576;
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Environment = "CLUSTER=${clusterName}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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PrivateDevices = "yes";
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PrivateTmp = "true";
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ProtectHome = "true";
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ProtectSystem = "full";
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Restart = "on-failure";
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StartLimitBurst = "5";
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StartLimitInterval = "30min";
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ExecStart = "${ceph.out}/bin/${if daemonType == "rgw" then "radosgw" else "ceph-${daemonType}"} -f --cluster ${clusterName} --id ${if daemonType == "rgw" then "client.${daemonId}" else daemonId} --setuser ceph --setgroup ceph";
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} // extraServiceConfig
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// optionalAttrs (daemonType == "osd") { ExecStartPre = "${ceph.out}/libexec/ceph/ceph-osd-prestart.sh --id ${daemonId} --cluster ${clusterName}"; };
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} // optionalAttrs (builtins.elem daemonType [ "mds" "mon" "rgw" "mgr" ]) { preStart = ''
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daemonPath="/var/lib/ceph/${if daemonType == "rgw" then "radosgw" else daemonType}/${clusterName}-${daemonId}"
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if [ ! -d ''$daemonPath ]; then
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mkdir -m 755 -p ''$daemonPath
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chown -R ceph:ceph ''$daemonPath
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fi
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'';
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} // optionalAttrs (daemonType == "osd") { path = [ pkgs.getopt ]; }
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);
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generateTargetFile = (daemonType:
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{
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"ceph-${daemonType}" = {
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description = "Ceph target allowing to start/stop all ceph-${daemonType} services at once";
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partOf = [ "ceph.target" ];
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before = [ "ceph.target" ];
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};
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}
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);
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in
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{
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options.services.ceph = {
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# Ceph has a monolithic configuration file but different sections for
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# each daemon, a separate client section and a global section
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enable = mkEnableOption "Ceph global configuration";
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global = {
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fsid = mkOption {
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type = types.str;
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example = ''
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433a2193-4f8a-47a0-95d2-209d7ca2cca5
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'';
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description = ''
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Filesystem ID, a generated uuid, its must be generated and set before
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attempting to start a cluster
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'';
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};
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clusterName = mkOption {
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type = types.str;
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default = "ceph";
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description = ''
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Name of cluster
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'';
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};
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monInitialMembers = mkOption {
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type = with types; nullOr commas;
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default = null;
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example = ''
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node0, node1, node2
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'';
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description = ''
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List of hosts that will be used as monitors at startup.
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'';
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};
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monHost = mkOption {
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type = with types; nullOr commas;
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default = null;
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example = ''
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10.10.0.1, 10.10.0.2, 10.10.0.3
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'';
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description = ''
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List of hostname shortnames/IP addresses of the initial monitors.
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'';
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};
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maxOpenFiles = mkOption {
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type = types.int;
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default = 131072;
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description = ''
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Max open files for each OSD daemon.
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'';
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};
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authClusterRequired = mkOption {
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type = types.enum [ "cephx" "none" ];
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default = "cephx";
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description = ''
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Enables requiring daemons to authenticate with eachother in the cluster.
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'';
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};
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authServiceRequired = mkOption {
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type = types.enum [ "cephx" "none" ];
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default = "cephx";
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description = ''
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Enables requiring clients to authenticate with the cluster to access services in the cluster (e.g. radosgw, mds or osd).
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'';
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};
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authClientRequired = mkOption {
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type = types.enum [ "cephx" "none" ];
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default = "cephx";
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description = ''
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Enables requiring the cluster to authenticate itself to the client.
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'';
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};
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publicNetwork = mkOption {
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type = with types; nullOr commas;
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default = null;
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example = ''
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10.20.0.0/24, 192.168.1.0/24
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'';
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description = ''
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A comma-separated list of subnets that will be used as public networks in the cluster.
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'';
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};
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clusterNetwork = mkOption {
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type = with types; nullOr commas;
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default = null;
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example = ''
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10.10.0.0/24, 192.168.0.0/24
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'';
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description = ''
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A comma-separated list of subnets that will be used as cluster networks in the cluster.
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'';
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};
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};
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mgr = {
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enable = mkEnableOption "Ceph MGR daemon";
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daemons = mkOption {
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type = with types; listOf str;
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default = [];
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example = ''
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[ "name1" "name2" ];
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'';
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description = ''
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A list of names for manager daemons that should have a service created. The names correspond
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to the id part in ceph i.e. [ "name1" ] would result in mgr.name1
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'';
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};
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extraConfig = mkOption {
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type = with types; attrsOf str;
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default = {};
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description = ''
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Extra configuration to add to the global section for manager daemons.
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'';
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};
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};
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mon = {
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enable = mkEnableOption "Ceph MON daemon";
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daemons = mkOption {
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type = with types; listOf str;
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default = [];
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example = ''
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[ "name1" "name2" ];
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'';
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description = ''
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A list of monitor daemons that should have a service created. The names correspond
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to the id part in ceph i.e. [ "name1" ] would result in mon.name1
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'';
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};
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extraConfig = mkOption {
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type = with types; attrsOf str;
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default = {};
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description = ''
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Extra configuration to add to the monitor section.
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'';
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};
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};
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osd = {
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enable = mkEnableOption "Ceph OSD daemon";
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daemons = mkOption {
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type = with types; listOf str;
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default = [];
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example = ''
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[ "name1" "name2" ];
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'';
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description = ''
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A list of OSD daemons that should have a service created. The names correspond
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to the id part in ceph i.e. [ "name1" ] would result in osd.name1
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'';
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};
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extraConfig = mkOption {
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type = with types; attrsOf str;
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default = {
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"osd journal size" = "10000";
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"osd pool default size" = "3";
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"osd pool default min size" = "2";
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"osd pool default pg num" = "200";
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"osd pool default pgp num" = "200";
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"osd crush chooseleaf type" = "1";
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};
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description = ''
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Extra configuration to add to the OSD section.
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'';
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};
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};
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mds = {
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enable = mkEnableOption "Ceph MDS daemon";
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daemons = mkOption {
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type = with types; listOf str;
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default = [];
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example = ''
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[ "name1" "name2" ];
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'';
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description = ''
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A list of metadata service daemons that should have a service created. The names correspond
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to the id part in ceph i.e. [ "name1" ] would result in mds.name1
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'';
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};
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extraConfig = mkOption {
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type = with types; attrsOf str;
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default = {};
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description = ''
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Extra configuration to add to the MDS section.
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'';
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};
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};
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rgw = {
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enable = mkEnableOption "Ceph RadosGW daemon";
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daemons = mkOption {
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type = with types; listOf str;
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default = [];
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example = ''
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[ "name1" "name2" ];
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'';
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description = ''
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A list of rados gateway daemons that should have a service created. The names correspond
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to the id part in ceph i.e. [ "name1" ] would result in client.name1, radosgw daemons
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aren't daemons to cluster in the sense that OSD, MGR or MON daemons are. They are simply
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daemons, from ceph, that uses the cluster as a backend.
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'';
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};
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};
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client = {
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enable = mkEnableOption "Ceph client configuration";
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extraConfig = mkOption {
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type = with types; attrsOf str;
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default = {};
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example = ''
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{
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# This would create a section for a radosgw daemon named node0 and related
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# configuration for it
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"client.radosgw.node0" = { "some config option" = "true"; };
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};
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'';
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description = ''
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Extra configuration to add to the client section. Configuration for rados gateways
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would be added here, with their own sections, see example.
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'';
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};
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};
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};
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config = mkIf config.services.ceph.enable {
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assertions = [
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{ assertion = cfg.global.fsid != "";
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message = "fsid has to be set to a valid uuid for the cluster to function";
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}
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{ assertion = cfg.mgr.enable == true;
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message = "ceph 12.x requires atleast 1 MGR daemon enabled for the cluster to function";
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}
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{ assertion = cfg.mon.enable == true -> cfg.mon.daemons != [];
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message = "have to set id of atleast one MON if you're going to enable Monitor";
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}
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{ assertion = cfg.mds.enable == true -> cfg.mds.daemons != [];
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message = "have to set id of atleast one MDS if you're going to enable Metadata Service";
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}
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{ assertion = cfg.osd.enable == true -> cfg.osd.daemons != [];
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message = "have to set id of atleast one OSD if you're going to enable OSD";
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}
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{ assertion = cfg.mgr.enable == true -> cfg.mgr.daemons != [];
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message = "have to set id of atleast one MGR if you're going to enable MGR";
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}
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];
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warnings = optional (cfg.global.monInitialMembers == null)
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''Not setting up a list of members in monInitialMembers requires that you set the host variable for each mon daemon or else the cluster won't function'';
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environment.etc."ceph/ceph.conf".text = let
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# Translate camelCaseOptions to the expected camel case option for ceph.conf
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translatedGlobalConfig = mapAttrs' (name: value: nameValuePair (translateOption name) value) cfg.global;
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# Merge the extraConfig set for mgr daemons, as mgr don't have their own section
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globalAndMgrConfig = translatedGlobalConfig // optionalAttrs cfg.mgr.enable cfg.mgr.extraConfig;
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# Remove all name-value pairs with null values from the attribute set to avoid making empty sections in the ceph.conf
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globalConfig = mapAttrs' (name: value: nameValuePair (translateOption name) value) (filterAttrs (name: value: value != null) globalAndMgrConfig);
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totalConfig = {
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"global" = globalConfig;
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} // optionalAttrs (cfg.mon.enable && cfg.mon.extraConfig != {}) { "mon" = cfg.mon.extraConfig; }
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// optionalAttrs (cfg.mds.enable && cfg.mds.extraConfig != {}) { "mds" = cfg.mds.extraConfig; }
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// optionalAttrs (cfg.osd.enable && cfg.osd.extraConfig != {}) { "osd" = cfg.osd.extraConfig; }
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// optionalAttrs (cfg.client.enable && cfg.client.extraConfig != {}) cfg.client.extraConfig;
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in
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generators.toINI {} totalConfig;
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users.users = singleton {
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name = "ceph";
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uid = config.ids.uids.ceph;
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description = "Ceph daemon user";
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};
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users.groups = singleton {
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name = "ceph";
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gid = config.ids.gids.ceph;
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};
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systemd.services = let
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services = []
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++ optional cfg.mon.enable (generateDaemonList "mon" cfg.mon.daemons { RestartSec = "10"; })
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++ optional cfg.mds.enable (generateDaemonList "mds" cfg.mds.daemons { StartLimitBurst = "3"; })
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++ optional cfg.osd.enable (generateDaemonList "osd" cfg.osd.daemons { StartLimitBurst = "30"; RestartSec = "20s"; })
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++ optional cfg.rgw.enable (generateDaemonList "rgw" cfg.rgw.daemons { })
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++ optional cfg.mgr.enable (generateDaemonList "mgr" cfg.mgr.daemons { StartLimitBurst = "3"; });
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in
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mkMerge services;
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systemd.targets = let
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targets = [
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{ "ceph" = { description = "Ceph target allowing to start/stop all ceph service instances at once"; }; }
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] ++ optional cfg.mon.enable (generateTargetFile "mon")
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++ optional cfg.mds.enable (generateTargetFile "mds")
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++ optional cfg.osd.enable (generateTargetFile "osd")
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++ optional cfg.rgw.enable (generateTargetFile "rgw")
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++ optional cfg.mgr.enable (generateTargetFile "mgr");
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in
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mkMerge targets;
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systemd.tmpfiles.rules = [
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"d /run/ceph 0770 ceph ceph -"
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];
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};
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}
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