277 lines
10 KiB
Python
277 lines
10 KiB
Python
#!/usr/bin/env python3
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# fencing.py - Utility functions for pvcnoded fencing
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2022 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import time
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import daemon_lib.common as common
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from pvcnoded.objects.VMInstance import VMInstance
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#
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# Fence thread entry function
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#
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def fence_node(node_name, zkhandler, config, logger):
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# We allow exactly 6 saving throws (30 seconds) for the host to come back online or we kill it
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failcount_limit = 6
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failcount = 0
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while failcount < failcount_limit:
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# Wait 5 seconds
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time.sleep(config["keepalive_interval"])
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# Get the state
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node_daemon_state = zkhandler.read(("node.state.daemon", node_name))
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# Is it still 'dead'
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if node_daemon_state == "dead":
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failcount += 1
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logger.out(
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'Node "{}" failed {}/{} saving throws'.format(
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node_name, failcount, failcount_limit
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),
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state="s",
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)
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# It changed back to something else so it must be alive
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else:
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logger.out(
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'Node "{}" passed a saving throw; canceling fence'.format(node_name),
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state="o",
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)
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return
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logger.out('Fencing node "{}" via IPMI reboot signal'.format(node_name), state="s")
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# Get IPMI information
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ipmi_hostname = zkhandler.read(("node.ipmi.hostname", node_name))
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ipmi_username = zkhandler.read(("node.ipmi.username", node_name))
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ipmi_password = zkhandler.read(("node.ipmi.password", node_name))
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# Shoot it in the head
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fence_status = reboot_via_ipmi(ipmi_hostname, ipmi_username, ipmi_password, logger)
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# Hold to ensure the fence takes effect and system stabilizes
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logger.out(
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'Waiting {}s for fence of node "{}" to take effect'.format(
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config["keepalive_interval"], node_name
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),
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state="i",
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)
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time.sleep(config["keepalive_interval"])
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if fence_status:
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logger.out('Marking node "{}" as fenced'.format(node_name), state="i")
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while True:
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try:
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zkhandler.write([(("node.state.daemon", node_name), "fenced")])
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break
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except Exception:
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continue
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# Force into secondary network state if needed
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if node_name in config["coordinators"]:
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logger.out(
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'Forcing secondary status for node "{}"'.format(node_name), state="i"
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)
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zkhandler.write([(("node.state.router", node_name), "secondary")])
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if zkhandler.read("base.config.primary_node") == node_name:
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zkhandler.write([("base.config.primary_node", "none")])
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# If the fence succeeded and successful_fence is migrate
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if fence_status and config["successful_fence"] == "migrate":
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migrateFromFencedNode(zkhandler, node_name, config, logger)
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# If the fence failed and failed_fence is migrate
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if (
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not fence_status
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and config["failed_fence"] == "migrate"
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and config["suicide_intervals"] != "0"
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):
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migrateFromFencedNode(zkhandler, node_name, config, logger)
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# Migrate hosts away from a fenced node
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def migrateFromFencedNode(zkhandler, node_name, config, logger):
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logger.out(
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'Migrating VMs from dead node "{}" to new hosts'.format(node_name), state="i"
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)
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# Get the list of VMs
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dead_node_running_domains = zkhandler.read(
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("node.running_domains", node_name)
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).split()
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# Set the node to a custom domainstate so we know what's happening
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zkhandler.write([(("node.state.domain", node_name), "fence-flush")])
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# Migrate a VM after a flush
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def fence_migrate_vm(dom_uuid):
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VMInstance.flush_locks(zkhandler, logger, dom_uuid)
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target_node = common.findTargetNode(zkhandler, dom_uuid)
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if target_node is not None:
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logger.out(
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'Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node),
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state="i",
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)
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zkhandler.write(
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[
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(("domain.state", dom_uuid), "start"),
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(("domain.node", dom_uuid), target_node),
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(("domain.last_node", dom_uuid), node_name),
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]
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)
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else:
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logger.out(
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'No target node found for VM "{}"; VM will autostart on next unflush/ready of current node'.format(
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dom_uuid
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),
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state="i",
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)
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zkhandler.write(
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{
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(("domain.state", dom_uuid), "stopped"),
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(("domain.meta.autostart", dom_uuid), "True"),
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}
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)
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# Loop through the VMs
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for dom_uuid in dead_node_running_domains:
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fence_migrate_vm(dom_uuid)
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# Set node in flushed state for easy remigrating when it comes back
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zkhandler.write([(("node.state.domain", node_name), "flushed")])
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logger.out(
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'All VMs flushed from dead node "{}" to new hosts'.format(node_name), state="i"
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)
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#
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# Perform an IPMI fence
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#
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def reboot_via_ipmi(ipmi_hostname, ipmi_user, ipmi_password, logger):
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# Power off the node the node
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logger.out("Sending power off to dead node", state="i")
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ipmi_command_stop = (
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"/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power off".format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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)
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ipmi_stop_retcode, ipmi_stop_stdout, ipmi_stop_stderr = common.run_os_command(
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ipmi_command_stop
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)
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if ipmi_stop_retcode != 0:
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logger.out(f"Failed to power off dead node: {ipmi_stop_stderr}", state="e")
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time.sleep(5)
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# Check the chassis power state
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logger.out("Checking power state of dead node", state="i")
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ipmi_command_status = (
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"/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status".format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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)
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ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(
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ipmi_command_status
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)
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if ipmi_status_retcode == 0:
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logger.out(
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f"Current chassis power state is: {ipmi_status_stdout.strip()}", state="i"
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)
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else:
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logger.out("Current chassis power state is: Unknown", state="w")
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# Power on the node
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logger.out("Sending power on to dead node", state="i")
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ipmi_command_start = (
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"/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power on".format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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)
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ipmi_start_retcode, ipmi_start_stdout, ipmi_start_stderr = common.run_os_command(
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ipmi_command_start
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)
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if ipmi_start_retcode != 0:
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logger.out(f"Failed to power on dead node: {ipmi_start_stderr}", state="w")
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time.sleep(2)
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# Check the chassis power state
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logger.out("Checking power state of dead node", state="i")
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ipmi_command_status = (
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"/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status".format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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)
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ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(
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ipmi_command_status
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)
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if ipmi_stop_retcode == 0:
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if ipmi_status_stdout.strip() == "Chassis Power is on":
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# We successfully rebooted the node and it is powered on; this is a succeessful fence
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logger.out("Successfully rebooted dead node", state="o")
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return True
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elif ipmi_status_stdout.strip() == "Chassis Power is off":
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# We successfully rebooted the node but it is powered off; this might be expected or not, but the node is confirmed off so we can call it a successful fence
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logger.out(
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"Chassis power is in confirmed off state after successfuly IPMI reboot; proceeding with fence-flush",
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state="o",
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)
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return True
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else:
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# We successfully rebooted the node but it is in some unknown power state; since this might indicate a silent failure, we must call it a failed fence
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logger.out(
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"Chassis power is in an unknown state ({}) after successful IPMI reboot; not performing fence-flush".format(
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ipmi_status_stdout.strip()
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),
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state="e",
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)
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return False
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else:
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if ipmi_status_stdout.strip() == "Chassis Power is off":
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# We failed to reboot the node but it is powered off; it has probably suffered a serious hardware failure, but the node is confirmed off so we can call it a successful fence
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logger.out(
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"Chassis power is in confirmed off state after failed IPMI reboot; proceeding with fence-flush",
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state="o",
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)
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return True
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else:
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# We failed to reboot the node but it is in some unknown power state (including "on"); since this might indicate a silent failure, we must call it a failed fence
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logger.out(
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"Chassis power is not in confirmed off state after failed IPMI reboot; not performing fence-flush",
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state="e",
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)
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return False
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#
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# Verify that IPMI connectivity to this host exists (used during node init)
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#
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def verify_ipmi(ipmi_hostname, ipmi_user, ipmi_password):
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ipmi_command = f"/usr/bin/ipmitool -I lanplus -H {ipmi_hostname} -U {ipmi_user} -P {ipmi_password} chassis power status"
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retcode, stdout, stderr = common.run_os_command(ipmi_command, timeout=2)
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if retcode == 0 and stdout.strip() == "Chassis Power is on":
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return True
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else:
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return False
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