cfe_internal/update/update_processes.cf

Table of Contents

common bodies

cfe_internal_process_knowledge

Prototype: cfe_internal_process_knowledge

Description: Variables related to CFEngine's own processes used in other bundles TODO Redact use of this bundle. It's no longer useful now that bindir variable exists. Not clear why its unset on windows.

Implementation:

bundle common cfe_internal_process_knowledge
{
  vars:

    !windows::

      "bindir"      string => "$(sys.bindir)",
      comment => "Use a system variable";
}

agent bundles

cfe_internal_update_processes

Prototype: cfe_internal_update_processes

Description: Determine which cfengine components should be managed, and what their state should be.

By default all the relevant services will run on each host. For example all hosts will run cf-execd, cf-serverd, and cf-monitord. Individual services can be disabled:

  • If persistent_disable_COMPONENT ( persistent_disable_cf_serverd, persistent_disable_cf_monitord) is defined the service will be disabled.

  • If the component is found in def.agents_to_be_disabled it will be disabled.

  • To enable component management on hosts with systemd define the class mpf_enable_cfengine_systemd_component_management.

Implementation:

bundle agent cfe_internal_update_processes
{
  classes:
      "systemd_supervised"
        scope => "bundle",
        expression => "systemd",
        comment => "As of 3.10 the runalerts service is supervised by systemd
                    when available. Prior to 3.10 the service is supervised
                    directly by CFEngine policy.";

  reports:
      inform.systemd_supervised.!mpf_enable_cfengine_systemd_component_management::
      "NOTE: You have defined a class to persistently disable a cfengine
             component on a systemd managed host, but you have not defined
             mpf_enable_cfengine_systemd_component_management in order to enable
             management"
        if => classmatch( "persistent_disable_cf_.*" );

      "NOTE: You have explicitly listed components that should be disabled in def.agents_to_be_disabled.
             This host is managed by systemd and requires the class
             mpf_enable_cfengine_systemd_component_management in order to enable
             active management"
        if => some( ".*", @(def.agents_to_be_disabled) );

  vars:

    any::

      # By default the core components are expected to be running in all cases.

      "agent[cf_execd]" string => "cf-execd";
      "agent[cf_serverd]" string => "cf-serverd";
      "agent[cf_monitord]" string => "cf-monitord";

    policy_server.enterprise_edition::

      "agent[cf_hub]"
        string => "cf-hub",
        comment => "cf-hub is only relevant on Enterprise hubs";

      "agent[cf_reactor]"
        string => "cf-reactor",
        comment => "cf-reactor is only provided on Enterprise hubs";

    systemd::

      # On systemd hosts the cfengine3 service acts as an umbrella for other
      # services.

      "agent[cfengine3]"
        string => "cfengine3",
        comment => "systemd hosts use the cfengine3 service as an umbrella.
                    systemd_supervised hosts additionally have individual units
                    for each managed service.";


    systemd_supervised.enterprise_edition.policy_server::

      # Only enterprise systemd supervised hosts these additional service
      # definitions for each component.

      "agent[cf_postgres]" string => "cf-postgres";
      "agent[cf_runalerts]" string => "cf-runalerts";
      "agent[cf_apache]"   string => "cf-apache";

    cfredis_in_enterprise::
      # TODO Remove from MPF after 3.12 EOL
      "agent[cf_redis_server]" -> { "ENT-2797" }
        string => "cf-redis-server";

    cfconsumer_in_enterprise::
      # TODO Remove from MPF after 3.12 EOL
      "agent[cf_consumer]" -> { "ENT-2797" }
        string => "cf-consumer";

    any::
      # We get a consolidated list of all agents for the executing host.
      "all_agents" slist => getvalues( agent );

      # We use def.agents_to_be_disabled if it exists, otherwise we default to
      # no agents being disabled.

      "agents_to_be_disabled"
        comment => "CFE processes that should not be enabled",
        handle => "cfe_internal_update_processes_vars_agents_to_be_disabled",
        slist => { @(def.agents_to_be_disabled) },
        if => isvariable( "def.agents_to_be_disabled" );

      "agents_to_be_disabled"
        comment => "The default agents that should not be enabled.",
        handle => "cfe_internal_update_processes_vars_default_agents_to_be_disabled",
        slist => { },
        if => not( isvariable("def.agents_to_be_disabled") );

      # An agent is disabled if there is a persistently defined disablement
      # class OR if the agent is found in a list of agents to be specifically
      # disabled.

      "disabled[$(all_agents)]"
        string => "$(all_agents)",
        if => or( canonify( "persistent_disable_$(all_agents)" ),
                          some( "$(all_agents)", agents_to_be_disabled ));

    systemd_supervised.policy_server.enterprise.hub_passive|(ha_replication_only_node.!failover_to_repliacation_node_enabled)::

      # We want the enterprise components cf-runalerts, and cf-hub to be
      # disabled if running on a passive hub or replication only hub.

      "disabled[cf_runalerts]" string => "cf-runalerts";
      "disabled[cf_hub]" string => "cf-hub";

    any::

      # First we get the consolidated list of agents to be disabled.
      "agents_to_be_disabled" slist => getvalues( disabled );

      # Any agent that is not explicitly disabled should be enabled.
      "agents_to_be_enabled"  slist => difference( all_agents, agents_to_be_disabled );

  methods:

    systemd.!systemd_supervised::
      # TODO Remove from policy.
      # This makes sure the cfengine3 (umbrella) unit is active. It does not
      # make any assertions about individual components. Furthermore, since
      # commit 6a7fe6b3fa466e55b29eca75cd53ff8b2883ff0e (introduced in 3.14)
      # this policy won't be run because systemd_supervised is defined any time
      # systemd is defined.

      "CFENGINE systemd service"
      usebundle => maintain_cfe_systemd,
      comment => "Call a bundle to maintain CFEngine with systemd",
      handle => "cfe_internal_update_processes_methods_maintain_systemd";

    systemd_supervised.mpf_enable_cfengine_systemd_component_management::

      "CFEngine systemd Unit Definitions"
        usebundle => cfe_internal_systemd_unit_files;

      "CFEngine systemd Unit States"
        usebundle => cfe_internal_systemd_service_unit_state;

    am_policy_hub.enterprise.!systemd_supervised::

      "TAKING CARE CFE HUB PROCESSES"
      usebundle => maintain_cfe_hub_process,
      comment => "Call a bundle to maintian HUB processes",
      handle => "cfe_internal_update_processes_methods_maintain_hub";

    !windows.!systemd_supervised::

      "DISABLING CFE AGENTS"
      usebundle => disable_cfengine_agents("$(agents_to_be_disabled)"),
      comment => "Call a bundle to disable CFEngine given processes",
      handle => "cfe_internal_update_processes_methods_disabling_cfe_agents";

      "CHECKING FOR PERSISTENTLY DISABLED CFE AGENTS"
      usebundle => disable_cfengine_agents($(all_agents)),
      if => canonify("persistent_disable_$(all_agents)"),
      comment => "Call a bundle to disable CFEngine given processes if persistent_disable_x is set",
      handle => "cfe_internal_update_processes_methods_maybe_disabling_cfe_agents";

      "ENABLING CFE AGENTS"
      usebundle => enable_cfengine_agents("$(agents_to_be_enabled)"),
      comment => "Call a bundle to enable CFEngine given processes",
      handle => "cfe_internal_update_processes_methods_enabling_cfe_agents";

    windows::

      "CFENGINE on Windows"
      usebundle => maintain_cfe_windows,
      comment => "Call a bundle to maintain CFEngine on Windows",
      handle => "cfe_internal_update_processes_methods_maintain_windows";

}

maintain_cfe_hub_process

Prototype: maintain_cfe_hub_process

Description: Ensure the proper processes are running on Enterprise hubs.

Implementation:

bundle agent maintain_cfe_hub_process
{
  vars:

    am_policy_hub::

      "file_check"  string => translatepath("$(cfe_internal_update_policy_cpv.inputs_dir)/promises.cf"),
      comment => "Path to a policy file",
      handle => "cfe_internal_maintain_cfe_hub_process_vars_file_check";

      #

  classes:

    am_policy_hub::

      "files_ok" expression => fileexists("$(file_check)"),
      comment => "Check for $(sys.workdir)/inputs/promises.cf",
      handle => "cfe_internal_maintain_cfe_hub_process_classes_files_ok";

    am_policy_hub.enable_cfengine_enterprise_hub_ha::
      "ha_run_hub_process"
        or => { "!ha_replication_only_node",
                "ha_replication_only_node.failover_to_replication_node_enabled" };

      "ha_kill_hub_process"
        or => { "ha_replication_only_node.!failover_to_replication_node_enabled" };

      #

  processes:

    am_policy_hub::

      "$(cfe_internal_process_knowledge.bindir)/vacuumdb"
      restart_class => "no_vacuumdb",
      comment => "Monitor vacuumdb process",
      handle => "cfe_internal_maintain_cfe_hub_process_processes_check_vacuumdb",
      if => "nova|enterprise";

   am_policy_hub.cfredis_in_enterprise::

      # TODO Remove from MPF after 3.12 EOL
      "$(cfe_internal_process_knowledge.bindir)/redis-server" -> { "ENT-2797" }
      restart_class => "start_redis_server",
      comment => "Monitor redis-server process",
      handle => "cfe_internal_maintain_cfe_hub_process_processes_redis",
      if => "nova|enterprise";

    am_policy_hub.cfconsumer_in_enterprise::
      "$(cfe_internal_process_knowledge.bindir)/cf-consumer" -> { "ENT-2797" }
      restart_class => "start_cf_consumer",
      comment => "Monitor cf-consumer process",
      handle => "cfe_internal_maintain_cfe_hub_process_processes_cf_consumer",
      if => "(nova|enterprise).no_vacuumdb";

   am_policy_hub.!enable_cfengine_enterprise_hub_ha::
      "$(cfe_internal_process_knowledge.bindir)/postgres"
      restart_class => "start_postgres_server",
      comment => "Monitor postgres process",
      handle => "cfe_internal_maintain_cfe_hub_process_processes_postgres",
      if => "nova|enterprise";

    am_policy_hub.!enable_cfengine_enterprise_hub_ha.files_ok.!windows|ha_run_hub_process::
      "cf-hub"      restart_class => "start_hub",
      comment => "Monitor cf-hub process",
      handle => "cfe_internal_maintain_cfe_hub_process_processes_cf_hub",
      if => and( "(nova|enterprise).no_vacuumdb",
                         "!persistent_disable_cf_hub" ); # Don't start it if it's persistently disabled

    am_policy_hub.ha_kill_hub_process::
      "cf-hub"      signals => { "term" },
      comment => "Terminate cf-hub on backup HA node outside cluster",
      handle => "cfe_internal_kill_hub_process_on_inactive_ha_node";

      #

  files:

      "/var/log/postgresql.log"
      comment => "Ensure postgres.log file is there with right permissions",
      handle => "cfe_internal_maintain_cfe_hub_process_files_create_postgresql_log",
      create => "true",
      perms => u_mo("0600","cfpostgres");

      #

  commands:

    !windows.am_policy_hub.start_redis_server.cfredis_in_enterprise::

      # TODO Remove from MPF after 3.12 EOL
     "$(cfe_internal_process_knowledge.bindir)/redis-server $(cfe_internal_update_policy_cpv.redis_conf_file)" -> { "ENT-2797" }
      contain => u_in_dir("/"),
      comment => "Start redis process",
      classes => u_kept_successful_command,
      handle => "cfe_internal_maintain_cfe_hub_process_commands_start_redis";

    !windows.am_policy_hub.!enable_cfengine_enterprise_hub_ha.start_postgres_server::
     "$(cfe_internal_process_knowledge.bindir)/pg_ctl -D $(cfe_internal_update_policy_cpv.postgresdb_dir) -l $(cfe_internal_update_policy_cpv.postgresdb_log) start"
      contain => u_postgres,
      comment => "Start postgres process",
      classes => u_kept_successful_command,
      handle => "cfe_internal_maintain_cfe_hub_process_commands_start_postgres";

    !windows.am_policy_hub.start_cf_consumer.cfconsumer_in_enterprise::
      # TODO Remove from MPF after 3.12 EOL

      "$(cfe_internal_process_knowledge.bindir)/cf-consumer"
      comment => "Start cf-consumer process",
      classes => u_kept_successful_command,
      handle => "cfe_internal_maintain_cfe_hub_process_commands_start_cf-consumer";

    !windows.am_policy_hub.start_hub::
      "$(sys.cf_hub)"
      comment => "Start cf-hub process",
      classes => u_kept_successful_command,
      handle => "cfe_internal_maintain_cfe_hub_process_commands_start_cf_hub";

}

disable_cfengine_agents

Prototype: disable_cfengine_agents(process)

Description: Ensure cfengine component is not running

Arguments:

  • process: The name of the cfengine component binary to ensure not running. [cf-agent, cf-serverd, cf-monitord, cf-hub]

Implementation:

bundle agent disable_cfengine_agents(process)
{
  vars:

    !windows::

      "cprocess"    string => canonify("$(process)"),
      comment => "Canonify a given process",
      handle => "cfe_internal_disable_cfengine_agents_vars_cprocess";

      #

  classes:

    !windows::

      "disable_$(cprocess)" expression => strcmp("$(process)","$(process)"),
      comment => "Create a class to disable a given process",
      handle => "cfe_internal_disable_cfengine_agents_classes_disable_process";

      #

  processes:

    !windows::

      "$(cfe_internal_process_knowledge.bindir)/$(process)"
      signals => { "term" },
      comment => "Terminate $(process)",
      handle => "cfe_internal_disable_cfengine_agents_processes_terminate_process",
      if => "disable_$(cprocess)";

}

enable_cfengine_agents

Prototype: enable_cfengine_agents(process)

Description: Ensure cfengine component is running

Arguments:

  • process: The name of the cfengine component binary to ensure running. [cf-agent, cf-serverd, cf-monitord, cf-hub]

Implementation:

bundle agent enable_cfengine_agents(process)
{
  vars:

    !windows::

      "cprocess"  string => canonify("$(process)"),
      comment => "Canonify a given process",
      handle => "cfe_internal_enable_cfengine_agents_vars_cprocess";

  classes:

    !windows::

      "enable_$(cprocess)" expression => "!persistent_disable_$(cprocess)",
      comment => "Create a class to enable a given process",
      handle => "cfe_internal_enable_cfengine_agents_classes_enable_process";

      #

  processes:

    !windows::

      "$(cfe_internal_process_knowledge.bindir)/$(process)"
      restart_class => "restart_$(cprocess)",
      comment => "Create a class to restart a process",
      handle => "cfe_internal_enable_cfengine_agents_processes_restart_process",
      if => "enable_$(cprocess)";

      #

  commands:

    !windows::

      "$(sys.$(cprocess))"
      comment => "Restart a process",
      handle => "cfe_internal_enable_cfengine_agents_commands_restart_process",
      classes => u_kept_successful_command,
      if => and( "restart_$(cprocess)",
                         isvariable( "sys.$(cprocess)" ) );

  reports:
      "The process $(process) is persistently disabled.  Run with '-Dclear_persistent_disable_$(cprocess)' to re-enable it."
      if => and( "persistent_disable_$(cprocess)",
                         isvariable( "sys.$(cprocess)" ));

      "The process $(process) has been re-enabled.  Run with '-Dset_persistent_disable_$(cprocess)' to disable it persistently again."
      if => and( "clear_persistent_disable_$(cprocess)",
                         isvariable( "sys.$(cprocess)" )),
      classes => u_clear_always("persistent_disable_$(cprocess)");

      "The process $(process) has been disabled persistently.  Run with '-Dclear_persistent_disable_$(cprocess)' to re-enable it."
      if => "set_persistent_disable_$(cprocess)",
      classes => u_always_forever("persistent_disable_$(cprocess)");
}

maintain_cfe_windows

Prototype: maintain_cfe_windows

Description: Ensure cfengine components are running

Implementation:

bundle agent maintain_cfe_windows
{
  vars:

    windows::

      "file_check"  string => translatepath("$(cfe_internal_update_policy_cpv.inputs_dir)/promises.cf"),
      comment => "Path to a policy file",
      handle => "cfe_internal_maintain_cfe_windows_vars_file_check";

      #

  classes:

    windows::

      "files_ok" expression => fileexists("$(file_check)"),
      comment => "Check for /var/cfengine/masterfiles/promises.cf",
      handle => "cfe_internal_maintain_cfe_windows_classes_files_ok";

      #

  processes:

    files_ok::

      "cf-serverd"  restart_class => "start_server",
      comment => "Monitor cf-serverd process",
      handle => "cfe_internal_maintain_cfe_windows_processes_cf_serverd";

      "cf-monitord" restart_class => "start_monitor",
      comment => "Monitor cf-monitord process",
      handle => "cfe_internal_maintain_cfe_windows_processes_cf_monitord";

      #

  services:

    files_ok.windows::

      "CfengineNovaExec"
      service_policy => "start",
      service_method => u_bootstart,
      comment => "Start the executor windows service now and at boot time",
      handle => "cfe_internal_maintain_cfe_windows_services_windows_executor";

      #

  commands:

    start_server::

      "$(sys.cf_serverd)"
      action => u_ifwin_bg,
      comment => "Start cf-serverd process",
      classes => u_kept_successful_command,
      handle => "cfe_internal_maintain_cfe_windows_commands_start_cf_serverd";

    start_monitor|restart_monitor::

      "$(sys.cf_monitord)"
      action => u_ifwin_bg,
      comment => "Start cf-monitord process",
      classes => u_kept_successful_command,
      handle => "cfe_internal_maintain_cfe_windows_commands_start_cf_monitord";

}

maintain_cfe_systemd

Prototype: maintain_cfe_systemd

Description: Ensure cfengine components are running

Implementation:

bundle agent maintain_cfe_systemd
{
  classes:
    systemd::
      "restart_cfe"
      not => returnszero("/bin/systemctl -q is-active cfengine3", "noshell"),
      comment => "Check running status of CFEngine using systemd",
      handle => "cfe_internal_maintain_cfe_systemd_classes_restart_cfe";

  commands:
    restart_cfe::
      "/bin/systemctl -q start cfengine3"
      comment => "Start CFEngine using systemd",
      handle => "cfe_internal_maintain_cfe_systemd_commands_start_cfe";
}

classes bodies

u_clear_always

Prototype: u_clear_always(theclass)

Description: Undefine, theclass for as a result of the promise actuation, no matter the outcome (kept, notkept, repaired)

Arguments:

  • theclass

Implementation:

body classes u_clear_always(theclass)
{
      cancel_kept => { $(theclass) };
      cancel_notkept => { $(theclass) };
      cancel_repaired => { $(theclass) };
}

u_always_forever

Prototype: u_always_forever(theclass)

Description: Define theclass for 999999999 minutes (1902 years) as a result of the promise actuation, no matter the outcome (kept, notkept, repaired)

Arguments:

  • theclass

Implementation:

body classes u_always_forever(theclass)
{
      promise_kept => { $(theclass) };
      promise_repaired => { $(theclass) };
      repair_failed => { $(theclass) };
      repair_denied => { $(theclass) };
      repair_timeout => { $(theclass) };
      persist_time => 999999999;
      scope => "namespace";
}