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Convert fencing to new zkhandler

This commit is contained in:
Joshua Boniface 2021-06-01 11:53:21 -04:00
parent 1c9a7a6479
commit 6beea0693c
1 changed files with 32 additions and 25 deletions
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57
node-daemon/pvcnoded/fencing.py
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@ -21,7 +21,6 @@
import time import time
import pvcnoded.zkhandler as zkhandler
import pvcnoded.common as common import pvcnoded.common as common
import pvcnoded.VMInstance as VMInstance import pvcnoded.VMInstance as VMInstance
@ -29,7 +28,7 @@ import pvcnoded.VMInstance as VMInstance
# #
# Fence thread entry function # Fence thread entry function
# #
def fenceNode(node_name, zk_conn, config, logger): def fenceNode(node_name, zkhandler, config, logger):
# We allow exactly 6 saving throws (30 seconds) for the host to come back online or we kill it # We allow exactly 6 saving throws (30 seconds) for the host to come back online or we kill it
failcount_limit = 6 failcount_limit = 6
failcount = 0 failcount = 0
@ -37,7 +36,7 @@ def fenceNode(node_name, zk_conn, config, logger):
# Wait 5 seconds # Wait 5 seconds
time.sleep(config['keepalive_interval']) time.sleep(config['keepalive_interval'])
# Get the state # Get the state
node_daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node_name)) node_daemon_state = zkhandler.read('/nodes/{}/daemonstate'.format(node_name))
# Is it still 'dead' # Is it still 'dead'
if node_daemon_state == 'dead': if node_daemon_state == 'dead':
failcount += 1 failcount += 1
@ -50,9 +49,9 @@ def fenceNode(node_name, zk_conn, config, logger):
logger.out('Fencing node "{}" via IPMI reboot signal'.format(node_name), state='w') logger.out('Fencing node "{}" via IPMI reboot signal'.format(node_name), state='w')
# Get IPMI information # Get IPMI information
ipmi_hostname = zkhandler.readdata(zk_conn, '/nodes/{}/ipmihostname'.format(node_name)) ipmi_hostname = zkhandler.read('/nodes/{}/ipmihostname'.format(node_name))
ipmi_username = zkhandler.readdata(zk_conn, '/nodes/{}/ipmiusername'.format(node_name)) ipmi_username = zkhandler.read('/nodes/{}/ipmiusername'.format(node_name))
ipmi_password = zkhandler.readdata(zk_conn, '/nodes/{}/ipmipassword'.format(node_name)) ipmi_password = zkhandler.read('/nodes/{}/ipmipassword'.format(node_name))
# Shoot it in the head # Shoot it in the head
fence_status = rebootViaIPMI(ipmi_hostname, ipmi_username, ipmi_password, logger) fence_status = rebootViaIPMI(ipmi_hostname, ipmi_username, ipmi_password, logger)
@ -62,47 +61,53 @@ def fenceNode(node_name, zk_conn, config, logger):
# Force into secondary network state if needed # Force into secondary network state if needed
if node_name in config['coordinators']: if node_name in config['coordinators']:
logger.out('Forcing secondary status for node "{}"'.format(node_name), state='i') logger.out('Forcing secondary status for node "{}"'.format(node_name), state='i')
zkhandler.writedata(zk_conn, {'/nodes/{}/routerstate'.format(node_name): 'secondary'}) zkhandler.write([
if zkhandler.readdata(zk_conn, '/config/primary_node') == node_name: ('/nodes/{}/routerstate'.format(node_name), 'secondary')
zkhandler.writedata(zk_conn, {'/config/primary_node': 'none'}) ])
if zkhandler.read('/config/primary_node') == node_name:
zkhandler.write([
('/config/primary_node', 'none')
])
# If the fence succeeded and successful_fence is migrate # If the fence succeeded and successful_fence is migrate
if fence_status and config['successful_fence'] == 'migrate': if fence_status and config['successful_fence'] == 'migrate':
migrateFromFencedNode(zk_conn, node_name, config, logger) migrateFromFencedNode(zkhandler, node_name, config, logger)
# If the fence failed and failed_fence is migrate # If the fence failed and failed_fence is migrate
if not fence_status and config['failed_fence'] == 'migrate' and config['suicide_intervals'] != '0': if not fence_status and config['failed_fence'] == 'migrate' and config['suicide_intervals'] != '0':
migrateFromFencedNode(zk_conn, node_name, config, logger) migrateFromFencedNode(zkhandler, node_name, config, logger)
# Migrate hosts away from a fenced node # Migrate hosts away from a fenced node
def migrateFromFencedNode(zk_conn, node_name, config, logger): def migrateFromFencedNode(zkhandler, node_name, config, logger):
logger.out('Migrating VMs from dead node "{}" to new hosts'.format(node_name), state='i') logger.out('Migrating VMs from dead node "{}" to new hosts'.format(node_name), state='i')
# Get the list of VMs # Get the list of VMs
dead_node_running_domains = zkhandler.readdata(zk_conn, '/nodes/{}/runningdomains'.format(node_name)).split() dead_node_running_domains = zkhandler.read('/nodes/{}/runningdomains'.format(node_name)).split()
# Set the node to a custom domainstate so we know what's happening # Set the node to a custom domainstate so we know what's happening
zkhandler.writedata(zk_conn, {'/nodes/{}/domainstate'.format(node_name): 'fence-flush'}) zkhandler.write([
('/nodes/{}/domainstate'.format(node_name), 'fence-flush')
])
# Migrate a VM after a flush # Migrate a VM after a flush
def fence_migrate_vm(dom_uuid): def fence_migrate_vm(dom_uuid):
VMInstance.flush_locks(zk_conn, logger, dom_uuid) VMInstance.flush_locks(zkhandler, logger, dom_uuid)
target_node = common.findTargetNode(zk_conn, config, logger, dom_uuid) target_node = common.findTargetNode(zkhandler, config, logger, dom_uuid)
if target_node is not None: if target_node is not None:
logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i') logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i')
zkhandler.writedata(zk_conn, { zkhandler.write([
'/domains/{}/state'.format(dom_uuid): 'start', ('/domains/{}/state'.format(dom_uuid), 'start'),
'/domains/{}/node'.format(dom_uuid): target_node, ('/domains/{}/node'.format(dom_uuid), target_node),
'/domains/{}/lastnode'.format(dom_uuid): node_name ('/domains/{}/lastnode'.format(dom_uuid), node_name)
}) ])
else: else:
logger.out('No target node found for VM "{}"; VM will autostart on next unflush/ready of current node'.format(dom_uuid), state='i') logger.out('No target node found for VM "{}"; VM will autostart on next unflush/ready of current node'.format(dom_uuid), state='i')
zkhandler.writedata(zk_conn, { zkhandler.write({
'/domains/{}/state'.format(dom_uuid): 'stopped', ('/domains/{}/state'.format(dom_uuid), 'stopped'),
'/domains/{}/node_autostart'.format(dom_uuid): 'True' ('/domains/{}/node_autostart'.format(dom_uuid), 'True')
}) })
# Loop through the VMs # Loop through the VMs
@ -110,7 +115,9 @@ def migrateFromFencedNode(zk_conn, node_name, config, logger):
fence_migrate_vm(dom_uuid) fence_migrate_vm(dom_uuid)
# Set node in flushed state for easy remigrating when it comes back # Set node in flushed state for easy remigrating when it comes back
zkhandler.writedata(zk_conn, {'/nodes/{}/domainstate'.format(node_name): 'flushed'}) zkhandler.write([
('/nodes/{}/domainstate'.format(node_name), 'flushed')
])
# #