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[#5] Implement zkhandler for readdata commands

This commit is contained in:
Joshua Boniface 2018-06-26 21:52:22 -04:00
parent 75ed61908a
commit 4737556c2c
3 changed files with 90 additions and 24 deletions
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40
pvcd/NodeInstance.py
View File

@ -130,21 +130,21 @@ class NodeInstance():
for dom_uuid in self.domain_list:
most_memfree = 0
target_hypervisor = None
hypervisor_list = self.zk_conn.get_children('/nodes')
current_hypervisor = self.zk_conn.get('/domains/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
hypervisor_list = zkhander.listchildren(self.zk_conn, '/nodes')
current_hypervisor = zkhandler.readdata(self.zk_conn, '/domains/{}/hypervisor'.format(dom_uuid))
if current_hypervisor != self.this_node:
continue
for hypervisor in hypervisor_list:
daemon_state = self.zk_conn.get('/nodes/{}/daemonstate'.format(hypervisor))[0].decode('ascii')
domain_state = self.zk_conn.get('/nodes/{}/domainstate'.format(hypervisor))[0].decode('ascii')
daemon_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/daemonstate'.format(hypervisor))
domain_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/domainstate'.format(hypervisor))
if hypervisor == current_hypervisor:
continue
if daemon_state != 'run' or domain_state != 'ready':
continue
memfree = int(self.zk_conn.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
memfree = int(zkhandler.readdata(self.zk_conn, '/nodes/{}/memfree'.format(hypervisor)))
if memfree > most_memfree:
most_memfree = memfree
target_hypervisor = hypervisor
@ -171,7 +171,7 @@ class NodeInstance():
ansiiprint.echo('Restoring node {} to active service.'.format(self.name), '', 'i')
self.zk_conn.set('/nodes/{}/domainstate'.format(self.name), 'ready'.encode('ascii'))
for dom_uuid in self.s_domain:
last_hypervisor = self.zk_conn.get('/domains/{}/lasthypervisor'.format(dom_uuid))[0].decode('ascii')
last_hypervisor = zkhandler.readdata(self.zk_conn, '/domains/{}/lasthypervisor'.format(dom_uuid))
if last_hypervisor != self.name:
continue
@ -193,7 +193,7 @@ class NodeInstance():
return
# Get past state and update if needed
past_state = self.zk_conn.get('/nodes/{}/daemonstate'.format(self.name))[0].decode('ascii')
past_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/daemonstate'.format(self.name))
if past_state != 'run':
self.daemon_state = 'run'
self.zk_conn.set('/nodes/{}/daemonstate'.format(self.name), 'run'.encode('ascii'))
@ -241,9 +241,9 @@ class NodeInstance():
# Update our local node lists
for node_name in self.t_node:
try:
node_daemon_state = self.zk_conn.get('/nodes/{}/daemonstate'.format(node_name))[0].decode('ascii')
node_domain_state = self.zk_conn.get('/nodes/{}/domainstate'.format(node_name))[0].decode('ascii')
node_keepalive = int(self.zk_conn.get('/nodes/{}/keepalive'.format(node_name))[0].decode('ascii'))
node_daemon_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/daemonstate'.format(node_name))
node_domain_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/domainstate'.format(node_name))
node_keepalive = int(zkhandler.readdata(self.zk_conn, '/nodes/{}/keepalive'.format(node_name)))
except:
node_daemon_state = 'unknown'
node_domain_state = 'unknown'
@ -307,7 +307,7 @@ def fenceNode(node_name, zk_conn):
# Wait 5 seconds
time.sleep(5)
# Get the state
node_daemon_state = zk_conn.get('/nodes/{}/daemonstate'.format(node_name))[0].decode('ascii')
node_daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node_name))
# Is it still 'dead'
if node_daemon_state == 'dead':
failcount += 1
@ -319,26 +319,26 @@ def fenceNode(node_name, zk_conn):
ansiiprint.echo('Fencing node "{}" via IPMI reboot signal'.format(node_name), '', 'e')
ipmi_hostname = zk_conn.get('/nodes/{}/ipmihostname'.format(node_name))[0].decode('ascii')
ipmi_username = zk_conn.get('/nodes/{}/ipmiusername'.format(node_name))[0].decode('ascii')
ipmi_password = zk_conn.get('/nodes/{}/ipmipassword'.format(node_name))[0].decode('ascii')
ipmi_hostname = zkhandler.readdata(zk_conn, '/nodes/{}/ipmihostname'.format(node_name))
ipmi_username = zkhandler.readdata(zk_conn, '/nodes/{}/ipmiusername'.format(node_name))
ipmi_password = zkhandler.readdata(zk_conn, '/nodes/{}/ipmipassword'.format(node_name))
rebootViaIPMI(ipmi_hostname, ipmi_username, ipmi_password)
time.sleep(5)
ansiiprint.echo('Moving VMs from dead hypervisor "{}" to new hosts'.format(node_name), '', 'i')
dead_node_running_domains = zk_conn.get('/nodes/{}/runningdomains'.format(node_name))[0].decode('ascii').split()
dead_node_running_domains = zkhandler.readdata(zk_conn, '/nodes/{}/runningdomains'.format(node_name)).split()
for dom_uuid in dead_node_running_domains:
most_memfree = 0
hypervisor_list = zk_conn.get_children('/nodes')
current_hypervisor = zk_conn.get('/domains/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
hypervisor_list = zkhandler.listchildren(zk_conn, '/nodes')
current_hypervisor = zkhandler.readdata(zk_conn, '/domains/{}/hypervisor'.format(dom_uuid))
for hypervisor in hypervisor_list:
print(hypervisor)
daemon_state = zk_conn.get('/nodes/{}/daemonstate'.format(hypervisor))[0].decode('ascii')
domain_state = zk_conn.get('/nodes/{}/domainstate'.format(hypervisor))[0].decode('ascii')
daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(hypervisor))
domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(hypervisor))
if daemon_state != 'run' or domain_state != 'ready':
continue
memfree = int(zk_conn.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(hypervisor)))
if memfree > most_memfree:
most_memfree = memfree
target_hypervisor = hypervisor

9
pvcd/VMInstance.py
View File

@ -22,6 +22,7 @@
import os, sys, uuid, socket, time, threading, libvirt, kazoo.client
import pvcd.ansiiprint as ansiiprint
import pvcd.zkhandler as zkhandler
class VMInstance:
# Initialization function
@ -100,7 +101,7 @@ class VMInstance:
try:
# Grab the domain information from Zookeeper
xmlconfig = self.zk_conn.get('/domains/{}/xml'.format(self.domuuid))[0].decode('ascii')
xmlconfig = zkhandler.readdata(self.zk_conn, '/domains/{}/xml'.format(self.domuuid))
dom = lv_conn.createXML(xmlconfig, 0)
self.addDomainToList()
ansiiprint.echo('Successfully started VM', '{}:'.format(self.domuuid), 'o')
@ -245,7 +246,7 @@ class VMInstance:
ansiiprint.echo('Receiving migration', '{}:'.format(self.domuuid), 'i')
while True:
time.sleep(0.5)
self.state = self.zk_conn.get('/domains/{}/state'.format(self.domuuid))[0].decode('ascii')
self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
self.dom = self.lookupByUUID(self.domuuid)
if self.dom == None and self.state == 'migrate':
@ -281,8 +282,8 @@ class VMInstance:
time.sleep(0.2)
# Get the current values from zookeeper (don't rely on the watch)
self.state = self.zk_conn.get('/domains/{}/state'.format(self.domuuid))[0].decode('ascii')
self.hypervisor = self.zk_conn.get('/domains/{}/hypervisor'.format(self.domuuid))[0].decode('ascii')
self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
self.hypervisor = zkhandler.readdata(self.zk_conn, '/domains/{}/hypervisor'.format(self.domuuid))
# Check the current state of the VM
try:

65
pvcd/zkhandler.py Normal file
View File

@ -0,0 +1,65 @@
#!/usr/bin/env python3
# zkhandler.py - Secure versioned ZooKeeper updates
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import kazoo.client, ansiiprint
# Child list function
def listchildren(zk_conn, key):
children = zk_conn.get_children(key)
return children
# Data read function
def readdata(zk_conn, key):
data_raw = zk_conn.get(key)
data = data_raw[0].decode('ascii')
meta = data_raw[1]
return data
# Data write function
def writedata(zk_conn, key, data):
# Get the current version
orig_data_raw = zk_conn.get(key)
meta = orig_data_raw[1]
if meta == None:
ansiiprint.echo('Zookeeper key "{}" does not exist'.format(key), '', 'e')
return 1
version = meta.version
new_version = version + 1
zk_transaction = zk_conn.transaction()
for line in data:
zk_transaction.set_data(key, line.encode('ascii'))
try:
zk_transaction.check(key, new_version)
except TypeError:
ansiiprint.echo('Zookeeper key "{}" does not match expected version'.format(key), '', 'e')
return 1
zk_transaction.commit()
return 0
# Key create function
def createkey(zk_conn, key, data):
zk_transaction = zk_conn.transaction()
for line in data:
zk_transaction.create(key, line.encode('ascii'))
zk_transaction.commit()