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# (c) Copyright IBM Corp. 2020 All Rights Reserved
#
# Author: Aman Kumar Sinha <amansi26@in.ibm.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""Reset RMC: Reset rsct node id"""
import os
from cloudinit import log as logging
from cloudinit import subp, util
from cloudinit.config.schema import MetaSchema
from cloudinit.distros import ALL_DISTROS
from cloudinit.settings import PER_INSTANCE
MODULE_DESCRIPTION = """\
Reset RMC module is IBM PowerVM Hypervisor specific
Reliable Scalable Cluster Technology (RSCT) is a set of software components,
that together provide a comprehensive clustering environment (RAS features)
for IBM PowerVM based virtual machines. RSCT includes the Resource monitoring
and control (RMC) subsystem. RMC is a generalized framework used for managing,
monitoring, and manipulating resources. RMC runs as a daemon process on
individual machines and needs creation of unique node id and restarts
during VM boot.
More details refer
https://www.ibm.com/support/knowledgecenter/en/SGVKBA_3.2/admin/bl503_ovrv.htm
This module handles
- creation of the unique RSCT node id to every instance/virtual machine
and ensure once set, it isn't changed subsequently by cloud-init.
In order to do so, it restarts RSCT service.
Prerequisite of using this module is to install RSCT packages.
"""
meta: MetaSchema = {
"id": "cc_reset_rmc",
"name": "Reset RMC",
"title": "reset rsct node id",
"description": MODULE_DESCRIPTION,
"distros": [ALL_DISTROS],
"frequency": PER_INSTANCE,
"examples": [],
}
# This module is undocumented in our schema docs
__doc__ = ""
# RMCCTRL is expected to be in system PATH (/opt/rsct/bin)
# The symlink for RMCCTRL and RECFGCT are
# /usr/sbin/rsct/bin/rmcctrl and
# /usr/sbin/rsct/install/bin/recfgct respectively.
RSCT_PATH = "/opt/rsct/install/bin"
RMCCTRL = "rmcctrl"
RECFGCT = "recfgct"
LOG = logging.getLogger(__name__)
NODE_ID_FILE = "/etc/ct_node_id"
def handle(name, _cfg, cloud, _log, _args):
# Ensuring node id has to be generated only once during first boot
if cloud.datasource.platform_type == "none":
LOG.debug("Skipping creation of new ct_node_id node")
return
if not os.path.isdir(RSCT_PATH):
LOG.debug("module disabled, RSCT_PATH not present")
return
orig_path = os.environ.get("PATH")
try:
add_path(orig_path)
reset_rmc()
finally:
if orig_path:
os.environ["PATH"] = orig_path
else:
del os.environ["PATH"]
def reconfigure_rsct_subsystems():
# Reconfigure the RSCT subsystems, which includes removing all RSCT data
# under the /var/ct directory, generating a new node ID, and making it
# appear as if the RSCT components were just installed
try:
out = subp.subp([RECFGCT])[0]
LOG.debug(out.strip())
return out
except subp.ProcessExecutionError:
util.logexc(LOG, "Failed to reconfigure the RSCT subsystems.")
raise
def get_node_id():
try:
fp = util.load_file(NODE_ID_FILE)
node_id = fp.split("\n")[0]
return node_id
except Exception:
util.logexc(LOG, "Failed to get node ID from file %s." % NODE_ID_FILE)
raise
def add_path(orig_path):
# Adding the RSCT_PATH to env standard path
# So thet cloud init automatically find and
# run RECFGCT to create new node_id.
suff = ":" + orig_path if orig_path else ""
os.environ["PATH"] = RSCT_PATH + suff
return os.environ["PATH"]
def rmcctrl():
# Stop the RMC subsystem and all resource managers so that we can make
# some changes to it
try:
return subp.subp([RMCCTRL, "-z"])
except Exception:
util.logexc(LOG, "Failed to stop the RMC subsystem.")
raise
def reset_rmc():
LOG.debug("Attempting to reset RMC.")
node_id_before = get_node_id()
LOG.debug("Node ID at beginning of module: %s", node_id_before)
# Stop the RMC subsystem and all resource managers so that we can make
# some changes to it
rmcctrl()
reconfigure_rsct_subsystems()
node_id_after = get_node_id()
LOG.debug("Node ID at end of module: %s", node_id_after)
# Check if new node ID is generated or not
# by comparing old and new node ID
if node_id_after == node_id_before:
msg = "New node ID did not get generated."
LOG.error(msg)
raise Exception(msg)
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