Attachment 874084 Details for Bug 1222206

cc_refresh_rmc_and_interface.py

cc_refresh_rmc_and_interface.py (text/plain), 5.45 KB, created by Andrey Savinykh on 2024-04-05 04:49:31 UTC

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Creator: Andrey Savinykh

Created: 2024-04-05 04:49:31 UTC

Size: 5.45 KB

patch

obsolete

># (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.
>
>"""Refresh IPv6 interface and RMC:
>Ensure Network Manager is not managing IPv6 interface"""
>
>import errno
>from logging import Logger
>
>from cloudinit import log as logging
>from cloudinit import netinfo, subp, util
>from cloudinit.cloud import Cloud
>from cloudinit.config import Config
>from cloudinit.config.schema import MetaSchema
>from cloudinit.settings import PER_ALWAYS
>
>MODULE_DESCRIPTION = """\
>This 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
>- Refreshing RMC
>- Disabling NetworkManager from handling IPv6 interface, as IPv6 interface
>  is used for communication between RMC daemon and PowerVM hypervisor.
>"""
>
>meta: MetaSchema = {
>    "id": "cc_refresh_rmc_and_interface",
>    "name": "Refresh IPv6 Interface and RMC",
>    "title": "Ensure Network Manager is not managing IPv6 interface",
>    "description": MODULE_DESCRIPTION,
>    "distros": ["fedora", "rhel"],
>    "frequency": PER_ALWAYS,
>    "examples": [],
>    "activate_by_schema_keys": [],
>}
>
># This module is undocumented in our schema docs
>__doc__ = ""
>
>LOG = logging.getLogger(__name__)
># Ensure that /opt/rsct/bin has been added to standard PATH of the
># distro. The symlink to rmcctrl is /usr/sbin/rsct/bin/rmcctrl .
>RMCCTRL = "rmcctrl"
>
>
>def handle(
>    name: str, cfg: Config, cloud: Cloud, log: Logger, args: list
>) -> None:
>    if not subp.which(RMCCTRL):
>        LOG.debug("No '%s' in path, disabled", RMCCTRL)
>        return
>
>    LOG.debug(
>        "Making the IPv6 up explicitly. "
>        "Ensuring IPv6 interface is not being handled by NetworkManager "
>        "and it is  restarted to re-establish the communication with "
>        "the hypervisor"
>    )
>
>    ifaces = find_ipv6_ifaces()
>
>    # Setting NM_CONTROLLED=no for IPv6 interface
>    # making it down and up
>
>    if len(ifaces) == 0:
>        LOG.debug("Did not find any interfaces with ipv6 addresses.")
>    else:
>        for iface in ifaces:
>            refresh_ipv6(iface)
>            disable_ipv6(sysconfig_path(iface))
>        restart_network_manager()
>
>
>def find_ipv6_ifaces():
>    info = netinfo.netdev_info()
>    ifaces = []
>    for iface, data in info.items():
>        if iface == "lo":
>            LOG.debug("Skipping localhost interface")
>        if len(data.get("ipv4", [])) != 0:
>            # skip this interface, as it has ipv4 addrs
>            continue
>        ifaces.append(iface)
>    return ifaces
>
>
>def refresh_ipv6(interface):
>    # IPv6 interface is explicitly brought up, subsequent to which the
>    # RMC services are restarted to re-establish the communication with
>    # the hypervisor.
>    subp.subp(["ip", "link", "set", interface, "down"])
>    subp.subp(["ip", "link", "set", interface, "up"])
>
>
>def sysconfig_path(iface):
>    return "/etc/sysconfig/network-scripts/ifcfg-" + iface
>
>
>def restart_network_manager():
>    subp.subp(["systemctl", "restart", "NetworkManager"])
>
>
>def disable_ipv6(iface_file):
>    # Ensuring that the communication b/w the hypervisor and VM is not
>    # interrupted due to NetworkManager. For this purpose, as part of
>    # this function, the NM_CONTROLLED is explicitly set to No for IPV6
>    # interface and NetworkManager is restarted.
>    try:
>        contents = util.load_file(iface_file)
>    except IOError as e:
>        if e.errno == errno.ENOENT:
>            LOG.debug("IPv6 interface file %s does not exist\n", iface_file)
>        else:
>            raise e
>
>    if "IPV6INIT" not in contents:
>        LOG.debug("Interface file %s did not have IPV6INIT", iface_file)
>        return
>
>    LOG.debug("Editing interface file %s ", iface_file)
>
>    # Dropping any NM_CONTROLLED or IPV6 lines from IPv6 interface file.
>    lines = contents.splitlines()
>    lines = [line for line in lines if not search(line)]
>    lines.append("NM_CONTROLLED=no")
>
>    with open(iface_file, "w") as fp:
>        fp.write("\n".join(lines) + "\n")
>
>
>def search(contents):
>    # Search for any NM_CONTROLLED or IPV6 lines in IPv6 interface file.
>    return (
>        contents.startswith("IPV6ADDR")
>        or contents.startswith("IPADDR6")
>        or contents.startswith("IPV6INIT")
>        or contents.startswith("NM_CONTROLLED")
>    )
>
>
>def refresh_rmc():
>    # To make a healthy connection between RMC daemon and hypervisor we
>    # refresh RMC. With refreshing RMC we are ensuring that making IPv6
>    # down and up shouldn't impact communication between RMC daemon and
>    # hypervisor.
>    # -z : stop Resource Monitoring & Control subsystem and all resource
>    # managers, but the command does not return control to the user
>    # until the subsystem and all resource managers are stopped.
>    # -s : start Resource Monitoring & Control subsystem.
>    try:
>        subp.subp([RMCCTRL, "-z"])
>        subp.subp([RMCCTRL, "-s"])
>    except Exception:
>        util.logexc(LOG, "Failed to refresh the RMC subsystem.")
>        raise

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Attachments on bug 1222206: 874083 | 874084