From: Guilherme Sperb Machado Date: Fri, 12 Sep 2014 14:38:06 +0000 (+0200) Subject: added files related to the ipv6 support on slices X-Git-Tag: nodemanager-5.2-15~3^2~15 X-Git-Url: http://git.onelab.eu/?p=nodemanager.git;a=commitdiff_plain;h=1b7d8ef3d9ddf592a8f97ef89b91ed457f1ba6b7 added files related to the ipv6 support on slices --- diff --git a/plugins/ipv6.py b/plugins/ipv6.py new file mode 100644 index 0000000..05b7446 --- /dev/null +++ b/plugins/ipv6.py @@ -0,0 +1,313 @@ +""" +IPv6 test! version: 0.3 +""" + +import logger +import os +import socket +import re + +import tools +import libvirt +import uuid +from sliver_libvirt import Sliver_Libvirt +from xml.dom.minidom import parseString + +priority=4 + +radvdConfFile = '/etc/radvd.conf' +ipv6addrtag = 'ipv6_address' + +def start(): + logger.log("ipv6: plugin starting up...") + +def buildLibvirtDefaultNetConfig(dom): + + # create the element + networkElem = dom.createElement("network") + # create element + nameElem = dom.createElement("name") + textName = dom.createTextNode("default") + nameElem.appendChild(textName) + # create element + uuidElem = dom.createElement("uuid") + textUUID = dom.createTextNode(str(uuid.uuid1())) + uuidElem.appendChild(textUUID) + # create element + forwardElem = dom.createElement("forward") + forwardElem.setAttribute("mode", "nat") + # create element + natElem = dom.createElement("nat") + # create element + portElem = dom.createElement("port") + portElem.setAttribute("end", "65535") + portElem.setAttribute("start", "1024") + # create the ipv4 element + ipElem0 = dom.createElement("ip") + ipElem0.setAttribute("address", "192.168.122.1") + ipElem0.setAttribute("netmask", "255.255.255.0") + # create the element + dhcpElem = dom.createElement("dhcp") + # create the element + rangeElem = dom.createElement("range") + rangeElem.setAttribute("end", "192.168.122.254") + rangeElem.setAttribute("start", "192.168.122.2") + # create the element + bridgeElem = dom.createElement("bridge") + bridgeElem.setAttribute("delay", "0") + bridgeElem.setAttribute("name", "virbr0") + bridgeElem.setAttribute("stp", "on") + + # build the whole thing + natElem.appendChild(portElem) + forwardElem.appendChild(natElem) + + dhcpElem.appendChild(rangeElem) + ipElem0.appendChild(dhcpElem) + networkElem.appendChild(nameElem) + networkElem.appendChild(uuidElem) + networkElem.appendChild(forwardElem) + networkElem.appendChild(bridgeElem) + networkElem.appendChild(ipElem0) + return networkElem + +def checkForIPv6(defaultNetworkConfig): + netnodes = defaultNetworkConfig.getElementsByTagName('network') + hasIPv6 = False + for netnode in netnodes: + ips = netnode.getElementsByTagName('ip') + for ip in ips: + if ip.getAttribute('family')=='ipv6': + logger.log("ipv6: the configuration already have an IPv6 address/prefix set for the slivers! %s/%s" % (ip.getAttribute('address'), ip.getAttribute('prefix')) ) + hasIPv6 = True + return hasIPv6 + + + +def addIPv6(defaultNetworkConfig, ipv6addr, prefix): + + netnodes = defaultNetworkConfig.getElementsByTagName('network') + for netnode in netnodes: + # create the ipv6 element 1 + ipElem1 = defaultNetworkConfig.createElement("ip") + ipElem1.setAttribute("family", "ipv6") + ipElem1.setAttribute("address", ipv6addr) + ipElem1.setAttribute("prefix", prefix) + # create the ipv6 element 2 + # it's ugly, I know, but we need a link-local address on the interface! + ipElem2 = defaultNetworkConfig.createElement("ip") + ipElem2.setAttribute("family", "ipv6") + ipElem2.setAttribute("address", "fe80:1234::1") + ipElem2.setAttribute("prefix", "64") + # adding to the 'defaultNetworkConfig' + netnode.appendChild(ipElem1) + netnode.appendChild(ipElem2) + return defaultNetworkConfig + +def changeIPv6(dom, ipv6addr, prefix): + ips = dom.getElementsByTagName('ip') + for ip in ips: + if ip.getAttribute("family")=='ipv6' and not(re.match(r'fe80(.*)', ip.getAttribute("address"), re.I)): + ip.setAttribute("address", ipv6addr) + ip.setAttribute("prefix", prefix) + return dom + + +def removeIPv6(dom): + networks = dom.getElementsByTagName('network') + for network in networks: + ips = network.getElementsByTagName('ip') + for ip in ips: + if ip.getAttribute("family")=='ipv6': + network.removeChild(ip) + return dom + + +def checkIfIPv6IsDifferent(dom, ipv6addr, prefix): + netnodes = dom.getElementsByTagName('network') + for netnode in netnodes: + ips = netnode.getElementsByTagName('ip') + for ip in ips: + if ip.getAttribute('family')=='ipv6' and not( re.match(r'fe80(.*)', ip.getAttribute("address"), re.I) ) and (ip.getAttribute('address')!=ipv6addr or ip.getAttribute('prefix')!=prefix): + logger.log("ipv6: the IPv6 address or prefix are different. Change detected!") + return True + + return False + + +def setAutostart(network): + try: + network.setAutostart(1) + except: + logger.log("ipv6: network could not set to autostart") + + +def setUp(networkLibvirt, connLibvirt, networkElem, ipv6addr, prefix): + newXml = networkElem.toxml() + #logger.log(networkElem.toxml()) + #ret = dir(conn) + #for method in ret: + # logger.log(repr(method)) + networkLibvirt.undefine() + networkLibvirt.destroy() + connLibvirt.networkCreateXML(newXml) + networkDefault = connLibvirt.networkDefineXML(newXml) + setAutostart(networkDefault) + commandForwarding = ['sysctl', '-w', 'net.ipv6.conf.all.forwarding=1'] + logger.log_call(commandForwarding, timeout=15*60) + configRadvd = """ +interface virbr0 +{ + AdvSendAdvert on; + MinRtrAdvInterval 30; + MaxRtrAdvInterval 100; + prefix %s + { + AdvOnLink on; + AdvAutonomous on; + AdvRouterAddr off; + }; + +}; +""" % (ipv6addr+"/"+prefix) + f=open(radvdConfFile,'w') + f.write(configRadvd) + f.close() + killRadvd() + startRadvd() + logger.log("ipv6: set up process finalized. Enabled IPv6 address to the slivers!") + +def cleanUp(networkLibvirt, connLibvirt, networkElem): + dom = removeIPv6(networkElem) + newXml = dom.toxml() + networkLibvirt.undefine() + networkLibvirt.destroy() + # TODO: set autostart for the network + connLibvirt.networkCreateXML(newXml) + networkDefault = connLibvirt.networkDefineXML(newXml) + setAutostart(networkDefault) + killRadvd() + logger.log("ipv6: cleanup process finalized. The IPv6 support on the slivers was removed.") + +def killRadvd(): + commandKillRadvd = ['killall', 'radvd'] + logger.log_call(commandKillRadvd, timeout=15*60) + +def startRadvd(): + commandRadvd = ['radvd'] + logger.log_call(commandRadvd, timeout=15*60) + +def getSliverTagId(slivertags): + for slivertag in slivertags: + if slivertag['tagname']==ipv6addrtag: + return slivertag['slice_tag_id'] + + +def SetSliverTag(plc, data, tagname): + + for sliver in data['slivers']: + # TODO: what about the prefixlen? should we add on it as well? + # here, I'm just taking the ipv6addr (value) + value,prefixlen = tools.get_sliver_ipv6(sliver['name']) + + node_id = tools.node_id() + logger.log("ipv6: slice %s" % (slice) ) + logger.log("ipv6: nodeid %s" % (node_id) ) + slivertags = plc.GetSliceTags({"name":slice['name'],"node_id":node_id,"tagname":tagname}) + logger.log(repr(str(slivertags))) + for tag in slivertags: + logger.log(repr(str(tag))) + + ipv6addr = plc.GetSliceIPv6Address(slice['name']) + # if the value to set is null... + if value is None: + if ipv6addr is not None or len(ipv6addr)==0: + # then, let's remove the slice tag + slivertag_id = getSliverTagId(slivertags) + plc.DeleteSliceTag(slivertag_id) + else: + # if the ipv6 addr set on the slice does not exist yet, so, let's add it + if (len(ipv6addr)==0 or ipv6addr is None) and len(value)>0: + try: + slivertag_id=plc.AddSliceTag(slice['name'],tagname,value,node_id) + logger.log("ipv6: slice tag added to slice %s" % (slice['name']) ) + except: + logger.log_exc ("ipv6: could not set ipv6 addr tag to the slive. slice=%(slice['name'])s tag=%(tagname)s node_id=%(node_id)d" % locals() ) + # if the ipv6 addr set on the slice is different on the value provided, let's update it + if len(value)>0 and ipv6addr!=value: + #slivertag_id=slivertags[0]['slice_tag_id'] + slivertag_id = getSliverTagId(slivertags) + plc.UpdateSliceTag(slivertag_id,value) + + +def GetSlivers(data, config, plc): + + #return + #for sliver in data['slivers']: + #ipv6addr,prefixlen = tools.get_sliver_ipv6(sliver['name']) + #tools.add_ipv6addr_hosts_line(sliver['name'], data['hostname'], ipv6addr) + #result = tools.search_ipv6addr_hosts(sliver['name'], ipv6addr) + #logger.log("tools: result=%s" % (str(result)) ) + #tools.remove_all_ipv6addr_hosts(sliver['name'], data['hostname']) + #return + + + type = 'sliver.LXC' + + interfaces = data['interfaces'] + logger.log(repr(interfaces)) + for interface in interfaces: + logger.log('ipv6: get interface 1: %r'%(interface)) + if 'interface_tag_ids' in interface: + interface_tag_ids = "interface_tag_ids" + interface_tag_id = "interface_tag_id" + settings = plc.GetInterfaceTags({interface_tag_id:interface[interface_tag_ids]}) + isSliversIPv6PrefixSet = False + for setting in settings: + #logger.log(repr(setting)) + if setting['tagname']=='sliversipv6prefix': + ipv6addrprefix = setting['value'].split('/', 1) + ipv6addr = ipv6addrprefix[0] + prefix = ipv6addrprefix[1] + logger.log("ipv6: %s" % (ipv6addr) ) + validIPv6 = tools.isValidIPv6(ipv6addr) + if not(validIPv6): + logger.log("ipv6: the 'sliversipv6prefix' tag presented a non-valid IPv6 address!") + else: + # connecting to the libvirtd + connLibvirt = Sliver_Libvirt.getConnection(type) + list = connLibvirt.listAllNetworks() + for networkLibvirt in list: + xmldesc = networkLibvirt.XMLDesc() + dom = parseString(xmldesc) + hasIPv6 = checkForIPv6(dom) + if hasIPv6: + # let's first check if the IPv6 is different or is it the same... + isDifferent = checkIfIPv6IsDifferent(dom, ipv6addr, prefix) + if isDifferent: + logger.log("ipv6: the tag 'sliversipv6prefix' was modified! Updating the configuration with the new one...") + networkElem = changeIPv6(dom, ipv6addr, prefix) + setUp(networkLibvirt, connLibvirt, networkElem, ipv6addr, prefix) + logger.log("ipv6: trying to reboot the slivers...") + tools.reboot_sliver('blah') + else: + logger.log("ipv6: starting to redefine the virtual network...") + #networkElem = buildLibvirtDefaultNetConfig(dom,ipv6addr,prefix) + networkElem = addIPv6(dom, ipv6addr, prefix) + setUp(networkLibvirt, connLibvirt, networkElem, ipv6addr, prefix) + logger.log("ipv6: trying to reboot the slivers...") + tools.reboot_sliver('blah') + isSliversIPv6PrefixSet = True + if not(isSliversIPv6PrefixSet): + # connecting to the libvirtd + connLibvirt = Sliver_Libvirt.getConnection(type) + list = connLibvirt.listAllNetworks() + for networkLibvirt in list: + xmldesc = networkLibvirt.XMLDesc() + dom = parseString(xmldesc) + if checkForIPv6(dom): + cleanUp(networkLibvirt, connLibvirt, dom) + logger.log("ipv6: trying to reboot the slivers...") + tools.reboot_sliver('blah') + + logger.log("ipv6: all done!") diff --git a/plugins/update_ipv6addr_slivertag.py b/plugins/update_ipv6addr_slivertag.py new file mode 100644 index 0000000..a1190cf --- /dev/null +++ b/plugins/update_ipv6addr_slivertag.py @@ -0,0 +1,84 @@ +""" +IPv6 test! version: 0.3 +""" + +import logger +import os +import socket +import re + +import tools +import libvirt +import uuid +from sliver_libvirt import Sliver_Libvirt +from xml.dom.minidom import parseString + +priority=150 + +ipv6addrtag = 'ipv6_address' + +def start(): + logger.log("update_ipv6addr_slivertag: plugin starting up...") + + +def getSliverTagId(slivertags): + for slivertag in slivertags: + if slivertag['tagname']==ipv6addrtag: + return slivertag['slice_tag_id'] + return None + +def SetSliverTag(plc, data, tagname): + + for slice in data['slivers']: + logger.log("update_ipv6addr_slivertag: starting the update procedure for slice=%s" % (slice['name']) ) + + # TODO: what about the prefixlen? should we add on it as well? + # here, I'm just taking the ipv6addr (value) + value,prefixlen = tools.get_sliver_ipv6(slice['name']) + + node_id = tools.node_id() + slivertags = plc.GetSliceTags({"name":slice['name'],"node_id":node_id,"tagname":tagname}) + #logger.log(repr(str(slivertags))) + #for tag in slivertags: + # logger.log(repr(str(tag))) + + ipv6addr = plc.GetSliceIPv6Address(slice['name']) + logger.log("update_ipv6addr_slivertag: slice=%s getSliceIPv6Address=%s" % (slice['name'],ipv6addr) ) + # if the value to set is null... + if value is None: + if ipv6addr is not None: + # then, let's remove the slice tag + slivertag_id = getSliverTagId(slivertags) + if slivertag_id: + try: + plc.DeleteSliceTag(slivertag_id) + logger.log("update_ipv6addr_slivertag: slice tag deleted for slice=%s" % (slice['name']) ) + except: + logger.log("update_ipv6addr_slivertag: slice tag not deleted for slice=%s" % (slice['name']) ) + # if there's no ipv6 address anymore, then remove everything from the /etc/hosts + tools.remove_all_ipv6addr_hosts(slice['name'], data['hostname']) + else: + # if the ipv6 addr set on the slice does not exist yet, so, let's add it + if (ipv6addr is None) and len(value)>0: + try: + logger.log("update_ipv6addr_slivertag: slice name=%s" % (slice['name']) ) + slivertag_id=plc.AddSliceTag(slice['name'],tagname,value,node_id) + logger.log("update_ipv6addr_slivertag: slice tag added to slice %s" % (slice['name']) ) + except: + logger.log("update_ipv6addr_slivertag: could not set ipv6 addr tag to the sliver. slice=%s tag=%s node_id=%d" % (slice['name'],tagname,node_id) ) + # if the ipv6 addr set on the slice is different on the value provided, let's update it + if (ipv6addr is not None) and (len(value)>0) and (ipv6addr!=value): + slivertag_id = getSliverTagId(slivertags) + plc.UpdateSliceTag(slivertag_id,value) + # ipv6 entry on /etc/hosts of each slice + result = tools.search_ipv6addr_hosts(slice['name'], value) + if not result: + tools.remove_all_ipv6addr_hosts(slice['name'], data['hostname']) + tools.add_ipv6addr_hosts_line(slice['name'], data['hostname'], value) + logger.log("update_ipv6addr_slivertag: finishing the update process for slice=%s" % (slice['name']) ) + +def GetSlivers(data, config, plc): + + SetSliverTag(plc, data, ipv6addrtag) + + logger.log("update_ipv6addr_slivertag: all done!") diff --git a/tools.py b/tools.py index 02e2ab9..b90a59e 100644 --- a/tools.py +++ b/tools.py @@ -11,6 +11,24 @@ import shutil import sys import signal +################################################### +# Added by Guilherme Sperb Machado +################################################### + +import re +import socket +import fileinput + +# TODO: is there anything better to do if the "libvirt", "sliver_libvirt", +# and "sliver_lxc" are not in place? +try: + import libvirt + from sliver_libvirt import Sliver_Libvirt + import sliver_lxc +except: + logger.log("Could not import sliver_lxc or libvirt or sliver_libvirt -- which is required here.") +################################################### + import logger PID_FILE = '/var/run/nodemanager.pid' @@ -237,6 +255,65 @@ def get_sliver_process(slice_name, process_cmdline): return (cgroup_fn, pid) +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Basically this method is just a copy from "get_process()", just +# adding one more split() to correctly parse the processes for LXC. +# Only for LXC! +# TODO: maybe merge both methods, and put the type as an argument, if +# it is LXC or vserver +################################################### +def get_sliver_process_lxc(slice_name, process_cmdline): + """ Utility function to find a process inside of an LXC sliver. Returns + (cgroup_fn, pid). cgroup_fn is the filename of the cgroup file for + the process, for example /proc/2592/cgroup. Pid is the process id of + the process. If the process is not found then (None, None) is returned. + """ + try: + cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name + output = os.popen(cmd).readlines() + except: + # the slice couldn't be found + logger.log("get_sliver_process: couldn't find slice %s" % slice_name) + return (None, None) + + cgroup_fn = None + pid = None + for e in output: + try: + l = e.rstrip() + #logger.log("tools: l=%s" % (l) ) + path = l.split(':')[0] + #logger.log("tools: path=%s" % (path) ) + comp = l.rsplit(':')[-1] + #logger.log("tools: comp=%s" % (comp) ) + slice_name_check1 = comp.rsplit('/')[-1] + #logger.log("tools: slice_name_check1=%s" % (slice_name_check1) ) + slice_name_check2 = slice_name_check1.rsplit('.')[0] + #logger.log("tools: slice_name_check2=%s" % (slice_name_check2) ) + + if (slice_name_check2 == slice_name): + slice_path = path + pid = slice_path.split('/')[2] + #logger.log("tools: pid=%s" % (pid) ) + cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00') + #logger.log("tools: cmdline=%s" % (cmdline) ) + #logger.log("tools: process_cmdline=%s" % (process_cmdline) ) + if (cmdline == process_cmdline): + cgroup_fn = slice_path + break + except: + #logger.log("tools: break!") + break + + if (not cgroup_fn) or (not pid): + logger.log("get_sliver_process: process %s not running in slice %s" % (process_cmdline, slice_name)) + return (None, None) + + return (cgroup_fn, pid) + + def get_sliver_ifconfig(slice_name, device="eth0"): """ return the output of "ifconfig" run from inside the sliver. @@ -276,6 +353,55 @@ def get_sliver_ifconfig(slice_name, device="eth0"): return result +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Basically this method is just a copy from "get_sliver_ifconfig()", but, +# instead, calls the "get_sliver_process_lxc()" method. +# Only for LXC! +# TODO: maybe merge both methods, and put the type as an argument, if +# it is LXC or vserver +################################################### +def get_sliver_ifconfig_lxc(slice_name, device="eth0"): + """ return the output of "ifconfig" run from inside the sliver. + + side effects: adds "/usr/sbin" to sys.path + """ + + # See if setns is installed. If it's not then we're probably not running + # LXC. + if not os.path.exists("/usr/sbin/setns.so"): + return None + + # setns is part of lxcsu and is installed to /usr/sbin + if not "/usr/sbin" in sys.path: + sys.path.append("/usr/sbin") + import setns + + (cgroup_fn, pid) = get_sliver_process_lxc(slice_name, "/sbin/init") + if (not cgroup_fn) or (not pid): + return None + + path = '/proc/%s/ns/net'%pid + + result = None + try: + setns.chcontext(path) + + args = ["/sbin/ifconfig", device] + sub = subprocess.Popen(args, stderr = subprocess.PIPE, stdout = subprocess.PIPE) + sub.wait() + + if (sub.returncode != 0): + logger.log("get_slice_ifconfig: error in ifconfig: %s" % sub.stderr.read()) + + result = sub.stdout.read() + finally: + setns.chcontext("/proc/1/ns/net") + + return result + + def get_sliver_ip(slice_name): ifconfig = get_sliver_ifconfig(slice_name) if not ifconfig: @@ -290,6 +416,39 @@ def get_sliver_ip(slice_name): return None +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Get the slice ipv6 address +# Only for LXC! +################################################### +def get_sliver_ipv6(slice_name): + ifconfig = get_sliver_ifconfig_lxc(slice_name) + if not ifconfig: + return None,None + + # example: 'inet6 2001:67c:16dc:1302:5054:ff:fea7:7882 prefixlen 64 scopeid 0x0' + prog = re.compile(r'inet6\s+(.*)\s+prefixlen\s+(\d+)\s+scopeid\s+(.+)') + for line in ifconfig.split("\n"): + search = prog.search(line) + if search: + ipv6addr = search.group(1) + prefixlen = search.group(2) + return (ipv6addr,prefixlen) + return None,None + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Check if the address is a AF_INET6 family address +################################################### +def isValidIPv6(ipv6addr): + try: + socket.inet_pton(socket.AF_INET6, ipv6addr) + except socket.error: + return False + return True + ### this returns the kind of virtualization on the node # either 'vs' or 'lxc' # also caches it in /etc/planetlab/virt for next calls @@ -319,6 +478,102 @@ def has_systemctl (): _has_systemctl = (subprocess.call([ 'systemctl', '--help' ]) == 0) return _has_systemctl +################################################### +# Author: Guilherme Sperb Machado +################################################### +# This method was developed to support the ipv6 plugin +# Only for LXC! +################################################### +def reboot_sliver(name): + type = 'sliver.LXC' + # connecting to the libvirtd + connLibvirt = Sliver_Libvirt.getConnection(type) + domains = connLibvirt.listAllDomains() + for domain in domains: + #ret = dir(domain) + #for method in ret: + # logger.log("ipv6: " + repr(method)) + #logger.log("tools: " + str(domain.name()) ) + try: + domain.destroy() + logger.log("tools: %s destroyed" % (domain.name()) ) + domain.create() + logger.log("tools: %s created" % (domain.name()) ) + except: + logger.log("tools: %s could not be rebooted" % (domain.name()) ) + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Get the /etc/hosts file path +################################################### +def get_hosts_file_path(slicename): + containerDir = os.path.join(sliver_lxc.Sliver_LXC.CON_BASE_DIR, slicename) + logger.log("tools: %s" % (containerDir) ) + return os.path.join(containerDir, 'etc', 'hosts') + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Search if there is a specific ipv6 address in the /etc/hosts file of a given slice +################################################### +def search_ipv6addr_hosts(slicename, ipv6addr): + hostsFilePath = get_hosts_file_path(slicename) + found=False + try: + for line in fileinput.input(r'%s' % (hostsFilePath)): + if re.search(r'%s' % (ipv6addr), line): + found=True + fileinput.close() + return found + except: + logger.log("tools: error when finding ipv6 address %s in the /etc/hosts file of slice=%s" % (ipv6addr, slicename) ) + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Removes all ipv6 addresses from the /etc/hosts file of a given slice +################################################### +def remove_all_ipv6addr_hosts(slicename, node): + hostsFilePath = get_hosts_file_path(slicename) + try: + for line in fileinput.input(r'%s' % (hostsFilePath), inplace=True): + logger.log("tools: line=%s" % (line) ) + search = re.search(r'^(.*)\s+(%s|%s)$' % (node,'localhost'), line) + if search: + ipv6candidate = search.group(1) + ipv6candidatestrip = ipv6candidate.strip() + logger.log("tools: group1=%s" % (ipv6candidatestrip) ) + valid = isValidIPv6(ipv6candidatestrip) + if not valid: + logger.log("tools: address=%s not valid" % (ipv6candidatestrip) ) + print line, + fileinput.close() + except: + logger.log("tools: could not delete the ipv6 address from the hosts file of slice=%s" % (slicename) ) + +################################################### +# Author: Guilherme Sperb Machado +################################################### +# Adds an ipv6 address to the /etc/hosts file within a slice +################################################### +def add_ipv6addr_hosts_line(slicename, node, ipv6addr): + hostsFilePath = get_hosts_file_path(slicename) + logger.log("tools: %s" % (hostsFilePath) ) + # debugging purposes: + #string = "127.0.0.1\tlocalhost\n192.168.100.179\tmyplc-node1-vm.mgmt.local\n" + #string = "127.0.0.1\tlocalhost\n" + try: + with open(hostsFilePath, "a") as file: + # debugging purposes only: + #file.write(string) + file.write(ipv6addr + " " + node + "\n") + file.close() + except: + logger.log("tools: could not add the IPv6 address to the hosts file of slice=%s" % (slicename) ) + + + # how to run a command in a slice # now this is a painful matter # the problem is with capsh that forces a bash command to be injected in its exec'ed command