def __init__(self,
cmd,
run_as_root=False,
respawn_interval=None,
namespace=None,
log_output=False,
die_on_error=False):
"""Constructor.
:param cmd: The list of command arguments to invoke.
:param run_as_root: The process should run with elevated privileges.
:param respawn_interval: Optional, the interval in seconds to wait
to respawn after unexpected process death. Respawn will
only be attempted if a value of 0 or greater is provided.
:param namespace: Optional, start the command in the specified
namespace.
:param log_output: Optional, also log received output.
:param die_on_error: Optional, kills the process on stderr output.
"""
self.cmd_without_namespace = cmd
self._cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
self.run_as_root = run_as_root
if respawn_interval is not None and respawn_interval < 0:
raise ValueError(_('respawn_interval must be >= 0 if provided.'))
self.respawn_interval = respawn_interval
self._process = None
self._is_running = False
self._kill_event = None
self._reset_queues()
self._watchers = []
self.log_output = log_output
self.die_on_error = die_on_error
def _ssh_and_ping_server(self, ssh_server, ping_server, namespace,
key_file_name):
"""Ssh into the server from the namespace.
In order to ssh it uses the following command:
ip netns exec <namespace> ssh -i <path to keyfile> cirros@<server_ip>
:param ssh_server: ip of the server to ssh into
:param ping_server: ip of the server to ping to
:param namespace: qrouter namespace
:param key_file_name: path to private key file
:return:
"""
LOG.debug(
"SSH INTO SERVER %s AND PING THE PEER SERVER %s FROM THE"
" NAMESPACE %s", ssh_server, ping_server, namespace)
try:
# ssh instance
host = "cirros@" + ssh_server
count = 20
cmd = [
'ssh', '-o', 'StrictHostKeyChecking=no', '-i', key_file_name,
host, 'ping', '-w', 2 * count, '-c', count, ping_server
]
cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
ping_result = linux_utils.execute(cmd, run_as_root=True)
LOG.debug("%s", ping_result)
return True
except RuntimeError:
return False
def __init__(self, cmd, run_as_root=False, respawn_interval=None,
namespace=None, log_output=False, die_on_error=False):
"""Constructor.
:param cmd: The list of command arguments to invoke.
:param run_as_root: The process should run with elevated privileges.
:param respawn_interval: Optional, the interval in seconds to wait
to respawn after unexpected process death. Respawn will
only be attempted if a value of 0 or greater is provided.
:param namespace: Optional, start the command in the specified
namespace.
:param log_output: Optional, also log received output.
:param die_on_error: Optional, kills the process on stderr output.
"""
self.cmd_without_namespace = cmd
self._cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
self.run_as_root = run_as_root
if respawn_interval is not None and respawn_interval < 0:
raise ValueError(_('respawn_interval must be >= 0 if provided.'))
self.respawn_interval = respawn_interval
self._process = None
self._is_running = False
self._kill_event = None
self._reset_queues()
self._watchers = []
self.log_output = log_output
self.die_on_error = die_on_error
def _ping_mtu(self, namespace, ip, size):
"""Pings ip address using packets of given size and with DF=1.
In order to ping it uses following cli command:
ip netns exec <namespace> ping -c 4 -M do -s <size> <ip>
"""
try:
cmd = ['ping', '-c', 4, '-M', 'do', '-s', size, ip]
cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
linux_utils.execute(cmd, run_as_root=True)
return True
except RuntimeError:
return False
def _get_namespace(self):
"""Get namespaces
:return: namespaces
"""
LOG.debug("GET NAMESPACES USING 'ip netns'")
try:
cmd = ['ip', 'netns']
cmd = ip_lib.add_namespace_to_cmd(cmd)
namespaces = linux_utils.execute(cmd)
LOG.debug("%s", namespaces)
return namespaces
except RuntimeError:
return None
def _delete_knownhosts_file(self):
"""Removes the knownhosts file
:param server_ips: ips to be removed from /root/.ssh/knownhosts
:return:
"""
LOG.debug("DELETE THE KNOWNHOST FILE")
try:
cmd = ['rm', '-rf', "~/.ssh/known_hosts"]
cmd = ip_lib.add_namespace_to_cmd(cmd)
linux_utils.execute(cmd)
return True
except RuntimeError:
return False
def _ping_mtu(self, from_site, to_site, size, instance=0):
"""Pings ip address using packets of given size and with DF=1.
In order to ping it uses following cli command:
ip netns exec <namespace> ping -c 4 -M do -s <size> <ip>
"""
namespace = from_site.vm[instance].namespace
ip = to_site.vm[instance].port_ip
try:
cmd = ["ping", "-c", 4, "-M", "do", "-s", size, ip]
cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
linux_utils.execute(cmd, run_as_root=True)
return True
except RuntimeError:
return False
def _get_interfaces(self, namespace):
"""Do an "ip a".
In order to do "ip a" it uses following cli command:
ip netns exec <namespace> ip a | grep qg
:param namespace: namespace
"""
LOG.debug("GET THE INTERFACES BY USING 'ip a' FROM THE NAMESPACE %s",
namespace)
try:
cmd = ['ip', 'a']
cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
interfaces = linux_utils.execute(cmd, run_as_root=True)
LOG.debug("%s", interfaces)
return interfaces
except RuntimeError:
return None
def _ping(self, namespace, ip):
"""Pings ip address from network namespace.
In order to ping it uses following cli command:
ip netns exec <namespace> ping -c 4 -q <ip>
:param namespace: namespace
:param ip: ip to ping to
"""
LOG.debug("PING %s FROM THE NAMESPACE %s", ip, namespace)
try:
count = 4
cmd = ['ping', '-w', 2 * count, '-c', count, ip]
cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
ping_result = linux_utils.execute(cmd, run_as_root=True)
LOG.debug("%s", ping_result)
return True
except RuntimeError:
return False
def _start_tcpdump(self, namespace, interface):
"""Starts tcpdump at the given interface
In order to start a "tcpdump" it uses the following command:
ip netns exec <namespace> sudo tcpdump -i <interface>
:param namespace: namespace
:param interface: interface
:return:
"""
LOG.debug(
"START THE TCPDUMP USING 'tcpdump -i <%s> FROM THE NAMESPACE"
" %s", interface, namespace)
try:
cmd = ['timeout', '10', 'tcpdump', '-n', '-i', interface]
cmd = ip_lib.add_namespace_to_cmd(cmd, namespace)
tcpdump = linux_utils.execute(cmd,
run_as_root=True,
extra_ok_codes=[124])
LOG.debug("%s", tcpdump)
return tcpdump
except RuntimeError:
return None
def test_add_namespace_to_cmd_without_namespace(self):
cmd = ['ping', '8.8.8.8']
self.assertEqual(cmd, ip_lib.add_namespace_to_cmd(cmd, None))
def test_add_namespace_to_cmd_with_namespace(self):
cmd = ['ping', '8.8.8.8']
self.assertEqual(['ip', 'netns', 'exec', 'tmp'] + cmd,
ip_lib.add_namespace_to_cmd(cmd, 'tmp'))
def test_add_namespace_to_cmd_without_namespace(self):
cmd = ['ping', '8.8.8.8']
self.assertEqual(cmd, ip_lib.add_namespace_to_cmd(cmd, None))
def test_add_namespace_to_cmd_with_namespace(self):
cmd = ['ping', '8.8.8.8']
self.assertEqual(['ip', 'netns', 'exec', 'tmp'] + cmd,
ip_lib.add_namespace_to_cmd(cmd, 'tmp'))
def test_add_namespace_to_cmd_without_namespace(self):
cmd = ["ping", "8.8.8.8"]
self.assertEqual(cmd, ip_lib.add_namespace_to_cmd(cmd, None))
def test_add_namespace_to_cmd_with_namespace(self):
cmd = ["ping", "8.8.8.8"]
self.assertEqual(["ip", "netns", "exec", "tmp"] + cmd, ip_lib.add_namespace_to_cmd(cmd, "tmp"))
