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Properly correct handling of primary during shutdown

This commit is contained in:
Joshua Boniface 2018-09-30 18:45:39 -04:00
parent 1483db3c2d
commit a86fd06184
2 changed files with 76 additions and 70 deletions
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33
router-daemon/pvcrd/Daemon.py
View File

@ -23,12 +23,13 @@
import kazoo.client
import sys
import os
import signal
import socket
import psutil
import subprocess
import time
import configparser
import signal
import atexit
import apscheduler.schedulers.background
import daemon_lib.ansiiprint as ansiiprint
@ -142,25 +143,30 @@ def zk_listener(state):
zk_conn.add_listener(zk_listener)
# Cleanup function
def cleanup(signum, frame):
ansiiprint.echo('Terminating daemon', '', 'e')
def cleanup():
ansiiprint.echo('Cleaning up', '', 'e')
# Stop keepalive thread
stopKeepaliveTimer(update_timer)
# Set stop state in Zookeeper
zkhandler.writedata(zk_conn, { '/routers/{}/daemonstate'.format(myhostname): 'stop' })
zkhandler.writedata(zk_conn, {'/routers/{}/daemonstate'.format(myhostname): 'stop'})
if this_router.name == this_router.primary_router:
zkhandler.writedata(zk_conn, {'/routers': 'none'})
# Wait for everything to flush
time.sleep(3)
# Close the Zookeeper connection
try:
zk_conn.stop()
zk_conn.close()
except:
pass
# Stop keepalive thread
stopKeepaliveTimer(update_timer)
# Exit
sys.exit(0)
# Handle signals gracefully
signal.signal(signal.SIGTERM, cleanup)
signal.signal(signal.SIGINT, cleanup)
signal.signal(signal.SIGQUIT, cleanup)
ansiiprint.echo('Terminating daemon', '', 'e')
atexit.register(cleanup)
# Gather useful data about our host for staticdata
# Static data format: 'cpu_count', 'arch', 'os', 'kernel'
@ -230,7 +236,6 @@ def updaterouters(new_router_list):
# Set up our update function
this_router = t_router[myhostname]
update_zookeeper = this_router.update_zookeeper
update_zookeeper()
@zk_conn.ChildrenWatch('/networks')
def updatenetworks(new_network_list):
@ -269,6 +274,6 @@ update_timer = createKeepaliveTimer()
# Tick loop
while True:
try:
time.sleep(0.1)
time.sleep(0.5)
except:
break

113
router-daemon/pvcrd/RouterInstance.py
View File

@ -40,6 +40,7 @@ class RouterInstance():
self.config = config
self.this_router = this_router
self.name = name
self.primary_router = None
self.daemon_state = 'stop'
self.network_state = 'secondary'
self.t_router = t_router
@ -52,26 +53,59 @@ class RouterInstance():
# Zookeeper handlers for changed states
@zk_conn.DataWatch('/routers/{}/daemonstate'.format(self.name))
def watch_hypervisor_daemonstate(data, stat, event=""):
def watch_router_daemonstate(data, stat, event=''):
try:
self.daemon_state = data.decode('ascii')
data = data.decode('ascii')
except AttributeError:
self.daemon_state = 'stop'
data = 'stop'
if data != self.daemon_state:
self.daemon_state = data
@zk_conn.DataWatch('/routers/{}/networkstate'.format(self.name))
def watch_hypervisor_networkstate(data, stat, event=""):
def watch_router_networkstate(data, stat, event=''):
try:
self.network_state = data.decode('ascii')
data = data.decode('ascii')
except AttributeError:
self.network_state = 'secondary'
data = 'secondary'
# toggle state management of this router
if s_network != {}: # If there's no network list, we're too early in startup
if data != self.network_state:
self.network_state = data
if self.name == self.this_router:
if self.network_state == 'secondary':
self.become_secondary()
if self.network_state == 'primary':
self.become_primary()
else:
self.become_secondary()
@zk_conn.DataWatch('/routers')
def watch_primary_router(data, stat, event=''):
try:
data = data.decode('ascii')
except AttributeError:
data = 'none'
# toggle state management of this router
if data != self.primary_router:
if data == 'none':
if self.name == self.this_router:
if self.daemon_state == 'run' and self.network_state != 'primary':
# Contend for primary
ansiiprint.echo('Contending for primary', '', 'i')
zkhandler.writedata(self.zk_conn, {
'/routers': self.name
})
elif data == self.this_router:
if self.name == self.this_router:
zkhandler.writedata(self.zk_conn, {
'/routers/{}/networkstate'.format(self.name): 'primary',
})
self.primary_router = data
else:
if self.name == self.this_router:
zkhandler.writedata(self.zk_conn, {
'/routers/{}/networkstate'.format(self.name): 'secondary',
})
self.primary_router = data
# Get value functions
def getname(self):
@ -96,43 +130,19 @@ class RouterInstance():
self.network_list.append(s_network[network].getvni())
def become_secondary(self):
time.sleep(1)
ansiiprint.echo('Setting router {} to secondary state'.format(self.name), '', 'i')
ansiiprint.echo('Network list: {}'.format(', '.join(self.network_list)), '', 'c')
for router in self.t_router:
if self.t_router[router].getname() != self.this_router:
if self.t_router[router].getnetworkstate() != 'primary':
zkhandler.writedata(self.zk_conn, { '/routers/{}/networkstate'.format(self.t_router[router].getname()): 'primary' })
time.sleep(2)
for network in self.s_network:
self.s_network[network].stopDHCPServer()
self.s_network[network].removeGatewayAddress()
def set_secondary(self):
result = zkhandler.writedata(self.zk_conn, {
'/routers/{}/networkstate'.format(self.name): 'secondary'
})
if not result:
time.sleep(1)
def become_primary(self):
ansiiprint.echo('Setting router {} to primary state.'.format(self.name), '', 'i')
ansiiprint.echo('Network list: {}'.format(', '.join(self.network_list)), '', 'c')
for network in self.s_network:
self.s_network[network].createGatewayAddress()
self.s_network[network].startDHCPServer()
for router in self.t_router:
if self.t_router[router].getname() != self.this_router:
if self.t_router[router].getnetworkstate() != 'secondary':
zkhandler.writedata(self.zk_conn, { '/routers/{}/networkstate'.format(self.t_router[router].getname()): 'secondary' })
def set_primary(self):
result = zkhandler.writedata(self.zk_conn, {
'/routers': self.name,
'/routers/{}/networkstate'.format(self.name): 'primary',
})
if not result:
time.sleep(1)
def update_zookeeper(self):
# Get past state and update if needed
@ -181,7 +191,7 @@ class RouterInstance():
fence_thread.start()
# Update the arrays
if router_daemon_state == 'run' and router_network_state != 'secondary' and router_name not in self.primary_router_list:
if router_daemon_state == 'run' and router_network_state == 'primary' and router_name not in self.primary_router_list:
self.primary_router_list.append(router_name)
try:
self.secondary_router_list.remove(router_name)
@ -191,17 +201,7 @@ class RouterInstance():
self.inactive_router_list.remove(router_name)
except ValueError:
pass
if router_daemon_state != 'run' and router_network_state != 'secondary' and router_name not in self.inactive_router_list:
self.inactive_router_list.append(router_name)
try:
self.primary_router_list.remove(router_name)
except ValueError:
pass
try:
self.secondary_router_list.remove(router_name)
except ValueError:
pass
if router_network_state == 'secondary' and router_name not in self.secondary_router_list:
if router_daemon_state == 'run' and router_network_state == 'secondary' and router_name not in self.secondary_router_list:
self.secondary_router_list.append(router_name)
try:
self.primary_router_list.remove(router_name)
@ -211,15 +211,16 @@ class RouterInstance():
self.inactive_router_list.remove(router_name)
except ValueError:
pass
# Try to set ourself primary if there is no primary in the cluster
cluster_has_primary = False
for router in self.t_router:
if self.t_router[router].getnetworkstate() == 'primary':
cluster_has_primary = True
break
if not cluster_has_primary:
self.set_primary()
if router_daemon_state != 'run' and router_name not in self.inactive_router_list:
self.inactive_router_list.append(router_name)
try:
self.primary_router_list.remove(router_name)
except ValueError:
pass
try:
self.secondary_router_list.remove(router_name)
except ValueError:
pass
# Display cluster information to the terminal
ansiiprint.echo('{}Cluster status{}'.format(ansiiprint.purple(), ansiiprint.end()), '', 't')