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cloud_utils.py
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1199 lines (996 loc) · 40.3 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Cloud.com Python utility library"""
import sys, os, subprocess, errno, re, time, glob
import urllib2
import xml.dom.minidom
import logging
import socket
# exit() error constants
E_GENERIC= 1
E_NOKVM = 2
E_NODEFROUTE = 3
E_DHCP = 4
E_NOPERSISTENTNET = 5
E_NETRECONFIGFAILED = 6
E_VIRTRECONFIGFAILED = 7
E_FWRECONFIGFAILED = 8
E_AGENTRECONFIGFAILED = 9
E_AGENTFAILEDTOSTART = 10
E_NOFQDN = 11
E_SELINUXENABLED = 12
try: E_USAGE = os.EX_USAGE
except AttributeError: E_USAGE = 64
E_NEEDSMANUALINTERVENTION = 13
E_INTERRUPTED = 14
E_SETUPFAILED = 15
E_UNHANDLEDEXCEPTION = 16
E_MISSINGDEP = 17
Unknown = 0
Fedora = 1
CentOS = 2
Ubuntu = 3
IPV4 = 4
IPV6 = 6
#=================== DISTRIBUTION DETECTION =================
if os.path.exists("/etc/fedora-release"): distro = Fedora
elif os.path.exists("/etc/centos-release"): distro = CentOS
elif os.path.exists("/etc/redhat-release") and not os.path.exists("/etc/fedora-release"): distro = CentOS
elif os.path.exists("/etc/legal") and "Ubuntu" in file("/etc/legal").read(-1): distro = Ubuntu
else: distro = Unknown
logFileName=None
# ================== LIBRARY UTILITY CODE=============
def setLogFile(logFile):
global logFileName
logFileName=logFile
def read_properties(propfile):
if not hasattr(propfile,"read"): propfile = file(propfile)
properties = propfile.read().splitlines()
properties = [ s.strip() for s in properties ]
properties = [ s for s in properties if
s and
not s.startswith("#") and
not s.startswith(";") ]
#[ logging.debug("Valid config file line: %s",s) for s in properties ]
proppairs = [ s.split("=",1) for s in properties ]
return dict(proppairs)
def stderr(msgfmt,*args):
"""Print a message to stderr, optionally interpolating the arguments into it"""
msgfmt += "\n"
if logFileName != None:
sys.stderr = open(logFileName, 'a+')
if args: sys.stderr.write(msgfmt%args)
else: sys.stderr.write(msgfmt)
def exit(errno=E_GENERIC,message=None,*args):
"""Exit with an error status code, printing a message to stderr if specified"""
if message: stderr(message,*args)
sys.exit(errno)
def resolve(host,port):
return [ (x[4][0],len(x[4])+2) for x in socket.getaddrinfo(host,port,socket.AF_UNSPEC,socket.SOCK_STREAM, 0, socket.AI_PASSIVE) ]
def resolves_to_ipv6(host,port):
return resolve(host,port)[0][1] == IPV6
###add this to Python 2.4, patching the subprocess module at runtime
if hasattr(subprocess,"check_call"):
from subprocess import CalledProcessError, check_call
else:
class CalledProcessError(Exception):
def __init__(self, returncode, cmd):
self.returncode = returncode ; self.cmd = cmd
def __str__(self): return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)
subprocess.CalledProcessError = CalledProcessError
def check_call(*popenargs, **kwargs):
retcode = subprocess.call(*popenargs, **kwargs)
cmd = kwargs.get("args")
if cmd is None: cmd = popenargs[0]
if retcode: raise subprocess.CalledProcessError(retcode, cmd)
return retcode
subprocess.check_call = check_call
# python 2.4 does not have this
try:
any = any
all = all
except NameError:
def any(sequence):
for i in sequence:
if i: return True
return False
def all(sequence):
for i in sequence:
if not i: return False
return True
class Command:
"""This class simulates a shell command"""
def __init__(self,name,parent=None):
self.__name = name
self.__parent = parent
def __getattr__(self,name):
if name == "_print": name = "print"
return Command(name,self)
def __call__(self,*args,**kwargs):
cmd = self.__get_recursive_name() + list(args)
#print " ",cmd
kwargs = dict(kwargs)
if "stdout" not in kwargs: kwargs["stdout"] = subprocess.PIPE
if "stderr" not in kwargs: kwargs["stderr"] = subprocess.PIPE
popen = subprocess.Popen(cmd,**kwargs)
m = popen.communicate()
ret = popen.wait()
if ret:
e = CalledProcessError(ret,cmd)
e.stdout,e.stderr = m
raise e
class CommandOutput:
def __init__(self,stdout,stderr):
self.stdout = stdout
self.stderr = stderr
return CommandOutput(*m)
def __lt__(self,other):
cmd = self.__get_recursive_name()
#print " ",cmd,"<",other
popen = subprocess.Popen(cmd,stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
m = popen.communicate(other)
ret = popen.wait()
if ret:
e = CalledProcessError(ret,cmd)
e.stdout,e.stderr = m
raise e
class CommandOutput:
def __init__(self,stdout,stderr):
self.stdout = stdout
self.stderr = stderr
return CommandOutput(*m)
def __get_recursive_name(self,sep=None):
m = self
l = []
while m is not None:
l.append(m.__name)
m = m.__parent
l.reverse()
if sep: return sep.join(l)
else: return l
def __str__(self):
return '<Command %r>'%self.__get_recursive_name(sep=" ")
def __repr__(self): return self.__str__()
kvmok = Command("kvm-ok")
getenforce = Command("/usr/sbin/getenforce")
ip = Command("ip")
service = Command("service")
chkconfig = Command("chkconfig")
updatercd = Command("update-rc.d")
ufw = Command("ufw")
iptables = Command("iptables")
iptablessave = Command("iptables-save")
augtool = Command("augtool")
ifconfig = Command("ifconfig")
ifdown = Command("ifdown")
ifup = Command("ifup")
brctl = Command("brctl")
uuidgen = Command("uuidgen")
def is_service_running(servicename):
try:
o = service(servicename,"status")
if distro is Ubuntu:
# status in ubuntu does not signal service status via return code
if "start/running" in o.stdout: return True
return False
else:
# retcode 0, service running
return True
except CalledProcessError,e:
# retcode nonzero, service not running
return False
def stop_service(servicename,force=False):
# This function is idempotent. N number of calls have the same result as N+1 number of calls.
if is_service_running(servicename) or force: service(servicename,"stop",stdout=None,stderr=None)
def disable_service(servicename):
# Stops AND disables the service
stop_service(servicename)
if distro is Ubuntu:
updatercd("-f",servicename,"remove",stdout=None,stderr=None)
else:
chkconfig("--del",servicename,stdout=None,stderr=None)
def start_service(servicename,force=False):
# This function is idempotent unless force is True. N number of calls have the same result as N+1 number of calls.
if not is_service_running(servicename) or force: service(servicename,"start",stdout=None,stderr=None)
def enable_service(servicename,forcestart=False):
# Stops AND disables the service
if distro is Ubuntu:
updatercd("-f",servicename,"remove",stdout=None,stderr=None)
updatercd("-f",servicename,"start","2","3","4","5",".",stdout=None,stderr=None)
else:
chkconfig("--add",servicename,stdout=None,stderr=None)
chkconfig("--level","345",servicename,"on",stdout=None,stderr=None)
start_service(servicename,force=forcestart)
def replace_line(f,startswith,stanza,always_add=False):
lines = [ s.strip() for s in file(f).readlines() ]
newlines = []
replaced = False
for line in lines:
if line.startswith(startswith):
newlines.append(stanza)
replaced = True
else: newlines.append(line)
if not replaced and always_add: newlines.append(stanza)
newlines = [ s + '\n' for s in newlines ]
file(f,"w").writelines(newlines)
def replace_or_add_line(f,startswith,stanza):
return replace_line(f,startswith,stanza,always_add=True)
# ==================================== CHECK FUNCTIONS ==========================
# If they return without exception, it's okay. If they raise a CheckFailed exception, that means a condition
# (generallly one that needs administrator intervention) was detected.
class CheckFailed(Exception): pass
#check function
def check_hostname():
"""If the hostname is a non-fqdn, fail with CalledProcessError. Else return 0."""
try: check_call(["hostname",'--fqdn'])
except CalledProcessError:
raise CheckFailed("This machine does not have an FQDN (fully-qualified domain name) for a hostname")
#check function
def check_kvm():
if distro in (Fedora,CentOS):
if os.path.exists("/dev/kvm"): return True
raise CheckFailed("KVM is not correctly installed on this system, or support for it is not enabled in the BIOS")
else:
try:
kvmok()
return True
except CalledProcessError:
raise CheckFailed("KVM is not correctly installed on this system, or support for it is not enabled in the BIOS")
except OSError,e:
if e.errno is errno.ENOENT: raise CheckFailed("KVM is not correctly installed on this system, or support for it is not enabled in the BIOS")
raise
return True
raise AssertionError, "check_kvm() should have never reached this part"
def check_cgroups():
return glob.glob("/*/cpu.shares")
#check function
def check_selinux():
if distro not in [Fedora,CentOS]: return # no selinux outside of those
enforcing = False
try:
output = getenforce().stdout.strip()
if "nforcing" in output:
enforcing = True
if any ( [ s.startswith("SELINUX=enforcing") for s in file("/etc/selinux/config").readlines() ] ):
enforcing = True
except (IOError,OSError),e:
if e.errno == 2: pass
else: raise CheckFailed("An unknown error (%s) took place while checking for SELinux"%str(e))
if enforcing:
raise CheckFailed("SELinux is set to enforcing, please set it to permissive in /etc/selinux/config, then reboot the machine or type setenforce Permissive, after which you can run this program again.")
def preflight_checks(do_check_kvm=True):
if distro is Ubuntu:
preflight_checks = [
(check_hostname,"Checking hostname"),
]
else:
preflight_checks = [
(check_hostname,"Checking hostname"),
(check_selinux,"Checking if SELinux is disabled"),
]
#preflight_checks.append( (check_cgroups,"Checking if the control groups /cgroup filesystem is mounted") )
if do_check_kvm: preflight_checks.append( (check_kvm,"Checking for KVM") )
return preflight_checks
# ========================== CONFIGURATION TASKS ================================
# A Task is a function that runs within the context of its run() function that runs the function execute(), which does several things, reporting back to the caller as it goes with the use of yield
# the done() method ought to return true if the task has run in the past
# the execute() method must implement the configuration act itself
# run() wraps the output of execute() within a Starting taskname and a Completed taskname message
# tasks have a name
class TaskFailed(Exception): pass
#def __init__(self,code,msg):
#Exception.__init__(self,msg)
#self.code = code
class ConfigTask:
name = "generic config task"
autoMode=False
def __init__(self): pass
def done(self):
"""Returns true if the config task has already been done in the past, false if it hasn't"""
return False
def execute(self):
"""Executes the configuration task. Must not be run if test() returned true.
Must yield strings that describe the steps in the task.
Raises TaskFailed if the task failed at some step.
"""
def run (self):
stderr("Starting %s"%self.name)
it = self.execute()
if not it:
pass # not a yielding iterable
else:
for msg in it: stderr(msg)
stderr("Completed %s"%self.name)
def setAutoMode(self, autoMode):
self.autoMode = autoMode
def isAutoMode(self):
return self.autoMode
# ============== these are some configuration tasks ==================
class SetupNetworking(ConfigTask):
name = "network setup"
def __init__(self,brname, pubNic, prvNic):
ConfigTask.__init__(self)
self.brname = brname
self.pubNic = pubNic
self.prvNic = prvNic
self.runtime_state_changed = False
self.was_nm_service_running = None
self.was_net_service_running = None
if distro in (Fedora, CentOS):
self.nmservice = 'NetworkManager'
self.netservice = 'network'
else:
self.nmservice = 'network-manager'
self.netservice = 'networking'
def done(self):
try:
alreadysetup = False
if distro in (Fedora,CentOS):
if self.pubNic != None:
alreadysetup = alreadysetup or augtool._print("/files/etc/sysconfig/network-scripts/ifcfg-%s"%self.pubNic).stdout.strip()
if self.prvNic != None:
alreadysetup = alreadysetup or augtool._print("/files/etc/sysconfig/network-scripts/ifcfg-%s"%self.prvNic).stdout.strip()
if not alreadysetup:
alreadysetup = augtool._print("/files/etc/sysconfig/network-scripts/ifcfg-%s"%self.brname).stdout.strip()
else:
if self.pubNic != None:
alreadysetup = alreadysetup or augtool._print("/files/etc/network/interfaces/iface",self.pubNic).stdout.strip()
if self.prvNic != None:
alreadysetup = alreadysetup or augtool._print("/files/etc/network/interfaces/iface",self.prvNic).stdout.strip()
if not alreadysetup:
alreadysetup = augtool.match("/files/etc/network/interfaces/iface",self.brname).stdout.strip()
return alreadysetup
except OSError,e:
if e.errno is 2: raise TaskFailed("augtool has not been properly installed on this system")
raise
def restore_state(self):
if not self.runtime_state_changed: return
try:
o = ifconfig(self.brname)
bridge_exists = True
except CalledProcessError,e:
print e.stdout + e.stderr
bridge_exists = False
if bridge_exists:
ifconfig(self.brname,"0.0.0.0")
if hasattr(self,"old_net_device"):
ifdown(self.old_net_device)
ifup(self.old_net_device)
try: ifdown(self.brname)
except CalledProcessError: pass
try: ifconfig(self.brname,"down")
except CalledProcessError: pass
try: brctl("delbr",self.brname)
except CalledProcessError: pass
try: ifdown("--force",self.brname)
except CalledProcessError: pass
if self.was_net_service_running is None:
# we do nothing
pass
elif self.was_net_service_running == False:
stop_service(self.netservice,force=True)
time.sleep(1)
else:
# we altered service configuration
stop_service(self.netservice,force=True)
time.sleep(1)
try: start_service(self.netservice,force=True)
except CalledProcessError,e:
if e.returncode == 1: pass
else: raise
time.sleep(1)
if self.was_nm_service_running is None:
# we do nothing
pass
elif self.was_nm_service_running == False:
stop_service(self.nmservice,force=True)
time.sleep(1)
else:
# we altered service configuration
stop_service(self.nmservice,force=True)
time.sleep(1)
start_service(self.nmservice,force=True)
time.sleep(1)
self.runtime_state_changed = False
def execute(self):
yield "Determining default route"
routes = ip.route().stdout.splitlines()
defaultroute = [ x for x in routes if x.startswith("default") ]
if not defaultroute: raise TaskFailed("Your network configuration does not have a default route")
dev = defaultroute[0].split()[4]
yield "Default route assigned to device %s"%dev
self.old_net_device = dev
if distro in (Fedora, CentOS):
inconfigfile = "/".join(augtool.match("/files/etc/sysconfig/network-scripts/*/DEVICE",dev).stdout.strip().split("/")[:-1])
if not inconfigfile: raise TaskFailed("Device %s has not been set up in /etc/sysconfig/network-scripts"%dev)
pathtoconfigfile = inconfigfile[6:]
if distro in (Fedora, CentOS):
automatic = augtool.match("%s/ONBOOT"%inconfigfile,"yes").stdout.strip()
else:
automatic = augtool.match("/files/etc/network/interfaces/auto/*/",dev).stdout.strip()
if not automatic:
if distro is Fedora: raise TaskFailed("Device %s has not been set up in %s as automatic on boot"%dev,pathtoconfigfile)
else: raise TaskFailed("Device %s has not been set up in /etc/network/interfaces as automatic on boot"%dev)
if distro not in (Fedora , CentOS):
inconfigfile = augtool.match("/files/etc/network/interfaces/iface",dev).stdout.strip()
if not inconfigfile: raise TaskFailed("Device %s has not been set up in /etc/network/interfaces"%dev)
if distro in (Fedora, CentOS):
isstatic = augtool.match(inconfigfile + "/BOOTPROTO","none").stdout.strip()
if not isstatic: isstatic = augtool.match(inconfigfile + "/BOOTPROTO","static").stdout.strip()
else:
isstatic = augtool.match(inconfigfile + "/method","static").stdout.strip()
if not isstatic:
if distro in (Fedora, CentOS): raise TaskFailed("Device %s has not been set up as a static device in %s"%(dev,pathtoconfigfile))
else: raise TaskFailed("Device %s has not been set up as a static device in /etc/network/interfaces"%dev)
if is_service_running(self.nmservice):
self.was_nm_service_running = True
yield "Stopping NetworkManager to avoid automatic network reconfiguration"
disable_service(self.nmservice)
else:
self.was_nm_service_running = False
if is_service_running(self.netservice):
self.was_net_service_running = True
else:
self.was_net_service_running = False
yield "Creating Cloud bridging device and making device %s member of this bridge"%dev
if distro in (Fedora, CentOS):
ifcfgtext = file(pathtoconfigfile).read()
newf = "/etc/sysconfig/network-scripts/ifcfg-%s"%self.brname
#def restore():
#try: os.unlink(newf)
#except OSError,e:
#if errno == 2: pass
#raise
#try: file(pathtoconfigfile,"w").write(ifcfgtext)
#except OSError,e: raise
f = file(newf,"w") ; f.write(ifcfgtext) ; f.flush() ; f.close()
innewconfigfile = "/files" + newf
script = """set %s/DEVICE %s
set %s/NAME %s
set %s/BRIDGE_PORTS %s
set %s/TYPE Bridge
rm %s/HWADDR
rm %s/UUID
rm %s/HWADDR
rm %s/IPADDR
rm %s/DEFROUTE
rm %s/NETMASK
rm %s/GATEWAY
rm %s/BROADCAST
rm %s/NETWORK
set %s/BRIDGE %s
save"""%(innewconfigfile,self.brname,innewconfigfile,self.brname,innewconfigfile,dev,
innewconfigfile,innewconfigfile,innewconfigfile,innewconfigfile,
inconfigfile,inconfigfile,inconfigfile,inconfigfile,inconfigfile,inconfigfile,
inconfigfile,self.brname)
yield "Executing the following reconfiguration script:\n%s"%script
try:
returned = augtool < script
if "Saved 2 file" not in returned.stdout:
print returned.stdout + returned.stderr
#restore()
raise TaskFailed("Network reconfiguration failed.")
else:
yield "Network reconfiguration complete"
except CalledProcessError,e:
#restore()
print e.stdout + e.stderr
raise TaskFailed("Network reconfiguration failed")
else: # Not fedora
backup = file("/etc/network/interfaces").read(-1)
#restore = lambda: file("/etc/network/interfaces","w").write(backup)
script = """set %s %s
set %s %s
set %s/bridge_ports %s
save"""%(automatic,self.brname,inconfigfile,self.brname,inconfigfile,dev)
yield "Executing the following reconfiguration script:\n%s"%script
try:
returned = augtool < script
if "Saved 1 file" not in returned.stdout:
#restore()
raise TaskFailed("Network reconfiguration failed.")
else:
yield "Network reconfiguration complete"
except CalledProcessError,e:
#restore()
print e.stdout + e.stderr
raise TaskFailed("Network reconfiguration failed")
yield "We are going to restart network services now, to make the network changes take effect. Hit ENTER when you are ready."
if self.isAutoMode(): pass
else:
raw_input()
# if we reach here, then if something goes wrong we should attempt to revert the runinng state
# if not, then no point
self.runtime_state_changed = True
yield "Enabling and restarting non-NetworkManager networking"
if distro is Ubuntu: ifup(self.brname,stdout=None,stderr=None)
stop_service(self.netservice)
try: enable_service(self.netservice,forcestart=True)
except CalledProcessError,e:
if e.returncode == 1: pass
else: raise
yield "Verifying that the bridge is up"
try:
o = ifconfig(self.brname)
except CalledProcessError,e:
print e.stdout + e.stderr
raise TaskFailed("The bridge could not be set up properly")
yield "Networking restart done"
class SetupCgConfig(ConfigTask):
name = "control groups configuration"
def done(self):
try:
return "group virt" in file("/etc/cgconfig.conf","r").read(-1)
except IOError,e:
if e.errno is 2: raise TaskFailed("cgconfig has not been properly installed on this system")
raise
def execute(self):
cgconfig = file("/etc/cgconfig.conf","r").read(-1)
cgconfig = cgconfig + """
group virt {
cpu {
cpu.shares = 9216;
}
}
"""
file("/etc/cgconfig.conf","w").write(cgconfig)
stop_service("cgconfig")
enable_service("cgconfig",forcestart=True)
class SetupCgRules(ConfigTask):
name = "control group rules setup"
cfgline = "root:/usr/sbin/libvirtd cpu virt/"
def done(self):
try:
return self.cfgline in file("/etc/cgrules.conf","r").read(-1)
except IOError,e:
if e.errno is 2: raise TaskFailed("cgrulesd has not been properly installed on this system")
raise
def execute(self):
cgrules = file("/etc/cgrules.conf","r").read(-1)
cgrules = cgrules + "\n" + self.cfgline + "\n"
file("/etc/cgrules.conf","w").write(cgrules)
stop_service("cgred")
enable_service("cgred")
class SetupCgroupControllers(ConfigTask):
name = "qemu cgroup controllers setup"
cfgline = "cgroup_controllers = [ \"cpu\" ]"
filename = "/etc/libvirt/qemu.conf"
def done(self):
try:
return self.cfgline in file(self.filename,"r").read(-1)
except IOError,e:
if e.errno is 2: raise TaskFailed("qemu has not been properly installed on this system")
raise
def execute(self):
libvirtqemu = file(self.filename,"r").read(-1)
libvirtqemu = libvirtqemu + "\n" + self.cfgline + "\n"
file("/etc/libvirt/qemu.conf","w").write(libvirtqemu)
class SetupSecurityDriver(ConfigTask):
name = "security driver setup"
cfgline = "security_driver = \"none\""
filename = "/etc/libvirt/qemu.conf"
def done(self):
try:
return self.cfgline in file(self.filename,"r").read(-1)
except IOError,e:
if e.errno is 2: raise TaskFailed("qemu has not been properly installed on this system")
raise
def execute(self):
libvirtqemu = file(self.filename,"r").read(-1)
libvirtqemu = libvirtqemu + "\n" + self.cfgline + "\n"
file("/etc/libvirt/qemu.conf","w").write(libvirtqemu)
class SetupLibvirt(ConfigTask):
name = "libvirt setup"
cfgline = "export CGROUP_DAEMON='cpu:/virt'"
def done(self):
try:
if distro in (Fedora,CentOS): libvirtfile = "/etc/sysconfig/libvirtd"
elif distro is Ubuntu: libvirtfile = "/etc/default/libvirt-bin"
else: raise AssertionError, "We should not reach this"
return self.cfgline in file(libvirtfile,"r").read(-1)
except IOError,e:
if e.errno is 2: raise TaskFailed("libvirt has not been properly installed on this system")
raise
def execute(self):
if distro in (Fedora,CentOS): libvirtfile = "/etc/sysconfig/libvirtd"
elif distro is Ubuntu: libvirtfile = "/etc/default/libvirt-bin"
else: raise AssertionError, "We should not reach this"
libvirtbin = file(libvirtfile,"r").read(-1)
libvirtbin = libvirtbin + "\n" + self.cfgline + "\n"
file(libvirtfile,"w").write(libvirtbin)
if distro in (CentOS, Fedora): svc = "libvirtd"
else: svc = "libvirt-bin"
stop_service(svc)
enable_service(svc)
class SetupLiveMigration(ConfigTask):
name = "live migration setup"
stanzas = (
"listen_tcp=1",
'tcp_port="16509"',
'auth_tcp="none"',
"listen_tls=0",
)
def done(self):
try:
lines = [ s.strip() for s in file("/etc/libvirt/libvirtd.conf").readlines() ]
if all( [ stanza in lines for stanza in self.stanzas ] ): return True
except IOError,e:
if e.errno is 2: raise TaskFailed("libvirt has not been properly installed on this system")
raise
def execute(self):
for stanza in self.stanzas:
startswith = stanza.split("=")[0] + '='
replace_or_add_line("/etc/libvirt/libvirtd.conf",startswith,stanza)
if distro is Fedora:
replace_or_add_line("/etc/sysconfig/libvirtd","LIBVIRTD_ARGS=","LIBVIRTD_ARGS=-l")
elif distro is Ubuntu:
if os.path.exists("/etc/init/libvirt-bin.conf"):
replace_line("/etc/init/libvirt-bin.conf", "exec /usr/sbin/libvirtd","exec /usr/sbin/libvirtd -d -l")
else:
replace_or_add_line("/etc/default/libvirt-bin","libvirtd_opts=","libvirtd_opts='-l -d'")
else:
raise AssertionError("Unsupported distribution")
if distro in (CentOS, Fedora): svc = "libvirtd"
else: svc = "libvirt-bin"
stop_service(svc)
enable_service(svc)
class SetupRequiredServices(ConfigTask):
name = "required services setup"
def done(self):
if distro is Fedora: nfsrelated = "rpcbind nfslock"
elif distro is CentOS: nfsrelated = "portmap nfslock"
else: return True
return all( [ is_service_running(svc) for svc in nfsrelated.split() ] )
def execute(self):
if distro is Fedora: nfsrelated = "rpcbind nfslock"
elif distro is CentOS: nfsrelated = "portmap nfslock"
else: raise AssertionError("Unsupported distribution")
for svc in nfsrelated.split(): enable_service(svc)
class SetupFirewall(ConfigTask):
name = "firewall setup"
def done(self):
if distro in (Fedora, CentOS):
if not os.path.exists("/etc/sysconfig/iptables"): return True
if ":on" not in chkconfig("--list","iptables").stdout: return True
else:
if "Status: active" not in ufw.status().stdout: return True
if not os.path.exists("/etc/ufw/before.rules"): return True
rule = "-p tcp -m tcp --dport 16509 -j ACCEPT"
if rule in iptablessave().stdout: return True
return False
def execute(self):
ports = "22 1798 16509".split()
if distro in (Fedora , CentOS):
for p in ports: iptables("-I","INPUT","1","-p","tcp","--dport",p,'-j','ACCEPT')
o = service.iptables.save() ; print o.stdout + o.stderr
else:
for p in ports: ufw.allow(p)
class SetupFirewall2(ConfigTask):
# this closes bug 4371
name = "additional firewall setup"
def __init__(self,brname):
ConfigTask.__init__(self)
self.brname = brname
def done(self):
if distro in (Fedora, CentOS):
if not os.path.exists("/etc/sysconfig/iptables"): return True
if ":on" not in chkconfig("--list","iptables").stdout: return True
rule = "FORWARD -i %s -o %s -j ACCEPT"%(self.brname,self.brname)
if rule in iptablessave().stdout: return True
return False
else:
if "Status: active" not in ufw.status().stdout: return True
if not os.path.exists("/etc/ufw/before.rules"): return True
rule = "-A ufw-before-forward -i %s -o %s -j ACCEPT"%(self.brname,self.brname)
if rule in file("/etc/ufw/before.rules").read(-1): return True
return False
def execute(self):
yield "Permitting traffic in the bridge interface, migration port and for VNC ports"
if distro in (Fedora , CentOS):
for rule in (
"-I FORWARD -i %s -o %s -j ACCEPT"%(self.brname,self.brname),
"-I INPUT 1 -p tcp --dport 5900:6100 -j ACCEPT",
"-I INPUT 1 -p tcp --dport 49152:49216 -j ACCEPT",
):
args = rule.split()
o = iptables(*args)
service.iptables.save(stdout=None,stderr=None)
else:
rule = "-A ufw-before-forward -i %s -o %s -j ACCEPT"%(self.brname,self.brname)
text = file("/etc/ufw/before.rules").readlines()
newtext = []
for line in text:
if line.startswith("COMMIT"):
newtext.append(rule + "\n")
newtext.append(line)
file("/etc/ufw/before.rules","w").writelines(newtext)
ufw.allow.proto.tcp("from","any","to","any","port","5900:6100")
ufw.allow.proto.tcp("from","any","to","any","port","49152:49216")
stop_service("ufw")
start_service("ufw")
# Tasks according to distribution -- at some point we will split them in separate modules
def config_tasks(brname, pubNic, prvNic):
if distro is CentOS:
config_tasks = (
SetupNetworking(brname, pubNic, prvNic),
SetupLibvirt(),
SetupRequiredServices(),
SetupFirewall(),
SetupFirewall2(brname),
)
elif distro in (Ubuntu,Fedora):
config_tasks = (
SetupNetworking(brname, pubNic, prvNic),
SetupCgConfig(),
SetupCgRules(),
SetupCgroupControllers(),
SetupSecurityDriver(),
SetupLibvirt(),
SetupLiveMigration(),
SetupRequiredServices(),
SetupFirewall(),
SetupFirewall2(brname),
)
else:
raise AssertionError("Unknown distribution")
return config_tasks
def backup_etc(targetdir):
if not targetdir.endswith("/"): targetdir += "/"
check_call( ["mkdir","-p",targetdir] )
rsynccall = ["rsync","-ax","--delete"] + ["/etc/",targetdir]
check_call( rsynccall )
def restore_etc(targetdir):
if not targetdir.endswith("/"): targetdir += "/"
rsynccall = ["rsync","-ax","--delete"] + [targetdir,"/etc/"]
check_call( rsynccall )
def remove_backup(targetdir):
check_call( ["rm","-rf",targetdir] )
def list_zonespods(host):
text = urllib2.urlopen('http://%s:8096/client/api?command=listPods'%host).read(-1)
dom = xml.dom.minidom.parseString(text)
x = [ (zonename,podname)
for pod in dom.childNodes[0].childNodes
for podname in [ x.childNodes[0].wholeText for x in pod.childNodes if x.tagName == "name" ]
for zonename in [ x.childNodes[0].wholeText for x in pod.childNodes if x.tagName == "zonename" ]
]
return x
def prompt_for_hostpods(zonespods):
"""Ask user to select one from those zonespods
Returns (zone,pod) or None if the user made the default selection."""
while True:
stderr("Type the number of the zone and pod combination this host belongs to (hit ENTER to skip this step)")
print " N) ZONE, POD"
print "================"
for n,(z,p) in enumerate(zonespods):
print "%3d) %s, %s"%(n,z,p)
print "================"
print "> ",
zoneandpod = raw_input().strip()
if not zoneandpod:
# we go with default, do not touch anything, just break
return None
try:
# if parsing fails as an int, just vomit and retry
zoneandpod = int(zoneandpod)
if zoneandpod >= len(zonespods) or zoneandpod < 0: raise ValueError, "%s out of bounds"%zoneandpod
except ValueError,e:
stderr(str(e))
continue # re-ask
# oh yeah, the int represents an valid zone and pod index in the array
return zonespods[zoneandpod]
# this configures the agent
def device_exist(devName):
try:
alreadysetup = False
if distro in (Fedora,CentOS):
alreadysetup = augtool._print("/files/etc/sysconfig/network-scripts/ifcfg-%s"%devName).stdout.strip()
else:
alreadysetup = augtool.match("/files/etc/network/interfaces/iface",devName).stdout.strip()
return alreadysetup
except OSError,e:
return False
def setup_agent_config(configfile, host, zone, pod, cluster, guid, pubNic, prvNic):
stderr("Examining Agent configuration")
fn = configfile
text = file(fn).read(-1)
lines = [ s.strip() for s in text.splitlines() ]
confopts = dict([ m.split("=",1) for m in lines if "=" in m and not m.startswith("#") ])
confposes = dict([ (m.split("=",1)[0],n) for n,m in enumerate(lines) if "=" in m and not m.startswith("#") ])
if guid != None:
confopts['guid'] = guid
else:
if not "guid" in confopts:
stderr("Generating GUID for this Agent")
confopts['guid'] = uuidgen().stdout.strip()
if host == None:
try: host = confopts["host"]
except KeyError: host = "localhost"
stderr("Please enter the host name of the management server that this agent will connect to: (just hit ENTER to go with %s)",host)
print "> ",
newhost = raw_input().strip()
if newhost: host = newhost
confopts["host"] = host
if pubNic != None and device_exist(pubNic):
confopts["public.network.device"] = pubNic
if prvNic == None or not device_exist(prvNic):
confopts["private.network.device"] = pubNic
if prvNic != None and device_exits(prvNic):
confopts["private.network.device"] = prvNic
if pubNic == None or not device_exits(pubNic):
confopts["public.network.device"] = prvNic
stderr("Querying %s for zones and pods",host)
try:
if zone == None or pod == None:
x = list_zonespods(confopts['host'])
zoneandpod = prompt_for_hostpods(x)
if zoneandpod:
confopts["zone"],confopts["pod"] = zoneandpod
stderr("You selected zone %s pod %s",confopts["zone"],confopts["pod"])
else:
stderr("Skipped -- using the previous zone %s pod %s",confopts["zone"],confopts["pod"])
else:
confopts["zone"] = zone
confopts["pod"] = pod
confopts["cluster"] = cluster
except (urllib2.URLError,urllib2.HTTPError),e:
stderr("Query failed: %s. Defaulting to zone %s pod %s",str(e),confopts["zone"],confopts["pod"])
for opt,val in confopts.items():
line = "=".join([opt,val])
if opt not in confposes: lines.append(line)
else: lines[confposes[opt]] = line
text = "\n".join(lines)
file(fn,"w").write(text)