mirror of
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e9b7a84aa1
Sometimes you may get:
> raise subprocess.CalledProcessError(exit_code, cmd)
E subprocess.CalledProcessError: Command '['iptables', '--wait', '-D', 'DOCKER-USER', '-p', 'tcp', '-s', '172.16.2.3', '-d', '172.16.2.2', '-j', 'DROP']' returned non-zero exit status 137.
And only sometimes you may get the reason:
OCI runtime exec failed: exec failed: cannot exec in a stopped container: unknown
So this means that container for iptables does not exists anymore, and
the reason is the timeout. And the fact that container_exit_timeout was
equal to container_expire_timeout and was 120.
From the docker logs:
time="2023-07-16T15:46:52.513673446Z" level=debug msg="form data: {\"AttachStderr\":false,\"AttachStdin\":false,\"AttachStdout\":false,\"Cmd\":[\"sleep\",\"120\"],\"HostConfig\":{\"AutoRemove\":true,\"NetworkMode\":\"host\"},\"Image\":\"clickhouse/integration-helper:latest\",\"NetworkDisabled\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Tty\":false}"
time="2023-07-16T15:48:57.611857183Z" level=debug msg="form data: {\"AttachStderr\":false,\"AttachStdin\":false,\"AttachStdout\":false,\"Cmd\":[\"sleep\",\"120\"],\"HostConfig\":{\"AutoRemove\":true,\"NetworkMode\":\"host\"},\"Image\":\"clickhouse/integration-helper:latest\",\"NetworkDisabled\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Tty\":false}"
And then pytest will try to execute the iptables command:
time="2023-07-16T15:50:57.698705244Z" level=debug msg="starting exec command 860920ab2aa07e8d285050f200ac92423a3cf8ec3fb2f57683541e62cf6bc20e in container 66d6c96671b5e987345290ddd260727d96b99789b512d40f333f6263f42fd2f1"
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
434 lines
14 KiB
Python
434 lines
14 KiB
Python
import os
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import subprocess
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import time
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import logging
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import docker
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class PartitionManager:
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"""Allows introducing failures in the network between docker containers.
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Can act as a context manager:
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with PartitionManager() as pm:
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pm.partition_instances(instance1, instance2)
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...
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# At exit all partitions are removed automatically.
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"""
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def __init__(self):
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self._iptables_rules = []
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self._netem_delayed_instances = []
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_NetworkManager.get()
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def drop_instance_zk_connections(self, instance, action="DROP"):
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self._check_instance(instance)
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self._add_rule(
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{"source": instance.ip_address, "destination_port": 2181, "action": action}
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)
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self._add_rule(
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{"destination": instance.ip_address, "source_port": 2181, "action": action}
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)
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def dump_rules(self):
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return _NetworkManager.get().dump_rules()
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def restore_instance_zk_connections(self, instance, action="DROP"):
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self._check_instance(instance)
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self._delete_rule(
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{"source": instance.ip_address, "destination_port": 2181, "action": action}
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)
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self._delete_rule(
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{"destination": instance.ip_address, "source_port": 2181, "action": action}
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)
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def partition_instances(self, left, right, port=None, action="DROP"):
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self._check_instance(left)
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self._check_instance(right)
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def create_rule(src, dst):
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rule = {
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"source": src.ip_address,
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"destination": dst.ip_address,
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"action": action,
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}
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if port is not None:
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rule["destination_port"] = port
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return rule
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self._add_rule(create_rule(left, right))
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self._add_rule(create_rule(right, left))
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def add_network_delay(self, instance, delay_ms):
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self._add_tc_netem_delay(instance, delay_ms)
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def heal_all(self):
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while self._iptables_rules:
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rule = self._iptables_rules.pop()
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_NetworkManager.get().delete_iptables_rule(**rule)
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while self._netem_delayed_instances:
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instance = self._netem_delayed_instances.pop()
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instance.exec_in_container(
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["bash", "-c", "tc qdisc del dev eth0 root netem"], user="root"
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)
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def pop_rules(self):
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res = self._iptables_rules[:]
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self.heal_all()
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return res
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def push_rules(self, rules):
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for rule in rules:
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self._add_rule(rule)
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@staticmethod
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def _check_instance(instance):
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if instance.ip_address is None:
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raise Exception("Instance + " + instance.name + " is not launched!")
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def _add_rule(self, rule):
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_NetworkManager.get().add_iptables_rule(**rule)
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self._iptables_rules.append(rule)
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def _delete_rule(self, rule):
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_NetworkManager.get().delete_iptables_rule(**rule)
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self._iptables_rules.remove(rule)
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def _add_tc_netem_delay(self, instance, delay_ms):
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instance.exec_in_container(
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[
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"bash",
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"-c",
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"tc qdisc add dev eth0 root netem delay {}ms".format(delay_ms),
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],
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user="root",
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)
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self._netem_delayed_instances.append(instance)
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.heal_all()
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def __del__(self):
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self.heal_all()
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class PartitionManagerDisabler:
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def __init__(self, manager):
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self.manager = manager
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self.rules = self.manager.pop_rules()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.manager.push_rules(self.rules)
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class _NetworkManager:
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"""Execute commands inside a container with access to network settings.
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We need to call iptables to create partitions, but we want to avoid sudo.
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The way to circumvent this restriction is to run iptables in a container with network=host.
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The container is long-running and periodically renewed - this is an optimization to avoid the overhead
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of container creation on each call.
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Source of the idea: https://github.com/worstcase/blockade/blob/master/blockade/host.py
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"""
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# Singleton instance.
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_instance = None
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@classmethod
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def get(cls, **kwargs):
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if cls._instance is None:
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cls._instance = cls(**kwargs)
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return cls._instance
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def add_iptables_rule(self, **kwargs):
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cmd = ["iptables", "--wait", "-I", "DOCKER-USER", "1"]
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cmd.extend(self._iptables_cmd_suffix(**kwargs))
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self._exec_run(cmd, privileged=True)
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def delete_iptables_rule(self, **kwargs):
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cmd = ["iptables", "--wait", "-D", "DOCKER-USER"]
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cmd.extend(self._iptables_cmd_suffix(**kwargs))
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self._exec_run(cmd, privileged=True)
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def dump_rules(self):
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cmd = ["iptables", "-L", "DOCKER-USER"]
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return self._exec_run(cmd, privileged=True)
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@staticmethod
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def clean_all_user_iptables_rules():
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for i in range(1000):
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iptables_iter = i
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# when rules will be empty, it will return error
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res = subprocess.run("iptables --wait -D DOCKER-USER 1", shell=True)
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if res.returncode != 0:
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logging.info(
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"All iptables rules cleared, "
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+ str(iptables_iter)
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+ " iterations, last error: "
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+ str(res.stderr)
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)
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return
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@staticmethod
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def _iptables_cmd_suffix(
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source=None,
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destination=None,
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source_port=None,
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destination_port=None,
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action=None,
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probability=None,
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custom_args=None,
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):
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ret = []
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if probability is not None:
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ret.extend(
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[
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"-m",
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"statistic",
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"--mode",
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"random",
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"--probability",
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str(probability),
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]
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)
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ret.extend(["-p", "tcp"])
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if source is not None:
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ret.extend(["-s", source])
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if destination is not None:
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ret.extend(["-d", destination])
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if source_port is not None:
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ret.extend(["--sport", str(source_port)])
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if destination_port is not None:
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ret.extend(["--dport", str(destination_port)])
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if action is not None:
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ret.extend(["-j"] + action.split())
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if custom_args is not None:
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ret.extend(custom_args)
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return ret
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def __init__(
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self,
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container_expire_timeout=600,
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container_exit_timeout=660,
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docker_api_version=os.environ.get("DOCKER_API_VERSION"),
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):
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# container should be alive for at least 15 seconds then the expiration
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# timeout, this is the protection from the case when the container will
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# be destroyed just when some test will try to use it.
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assert container_exit_timeout >= container_expire_timeout + 15
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self.container_expire_timeout = container_expire_timeout
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self.container_exit_timeout = container_exit_timeout
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self._docker_client = docker.DockerClient(
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base_url="unix:///var/run/docker.sock",
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version=docker_api_version,
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timeout=600,
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)
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self._container = None
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self._ensure_container()
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def _ensure_container(self):
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if self._container is None or self._container_expire_time <= time.time():
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image_name = "clickhouse/integration-helper:" + os.getenv(
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"DOCKER_HELPER_TAG", "latest"
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)
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for i in range(5):
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if self._container is not None:
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try:
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logging.debug("[network] Removing %s", self._container.id)
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self._container.remove(force=True)
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break
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except docker.errors.NotFound:
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break
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except Exception as ex:
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print(
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"Error removing network blocade container, will try again",
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str(ex),
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)
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time.sleep(i)
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image = subprocess.check_output(
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f"docker images -q {image_name} 2>/dev/null", shell=True
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)
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if not image.strip():
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print("No network image helper, will try download")
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# for some reason docker api may hang if image doesn't exist, so we download it
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# before running
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for i in range(5):
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try:
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subprocess.check_call( # STYLE_CHECK_ALLOW_SUBPROCESS_CHECK_CALL
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f"docker pull {image_name}", shell=True
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)
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break
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except:
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time.sleep(i)
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else:
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raise Exception(f"Cannot pull {image_name} image")
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self._container = self._docker_client.containers.run(
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image_name,
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auto_remove=True,
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command=("sleep %s" % self.container_exit_timeout),
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detach=True,
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network_mode="host",
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)
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logging.debug("[network] Created new container %s", self._container.id)
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self._container_expire_time = time.time() + self.container_expire_timeout
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return self._container
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def _exec_run_with_retry(self, cmd, retry_count, **kwargs):
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for i in range(retry_count):
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try:
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self._exec_run(cmd, **kwargs)
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except subprocess.CalledProcessError as e:
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logging.error(f"_exec_run failed for {cmd}, {e}")
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def _exec_run(self, cmd, **kwargs):
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container = self._ensure_container()
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handle = self._docker_client.api.exec_create(container.id, cmd, **kwargs)
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output = self._docker_client.api.exec_start(handle).decode("utf8")
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exit_code = self._docker_client.api.exec_inspect(handle)["ExitCode"]
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logging.debug(
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"[network] %s: %s (%s): %s", container.id, cmd, exit_code, output.strip()
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)
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if exit_code != 0:
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print(output)
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raise subprocess.CalledProcessError(exit_code, cmd)
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return output
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# Approximately measure network I/O speed for interface
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class NetThroughput(object):
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def __init__(self, node):
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self.node = node
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# trying to get default interface and check it in /proc/net/dev
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self.interface = self.node.exec_in_container(
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[
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"bash",
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"-c",
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"awk '{print $1 \" \" $2}' /proc/net/route | grep 00000000 | awk '{print $1}'",
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]
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).strip()
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check = self.node.exec_in_container(
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["bash", "-c", f'grep "^ *{self.interface}:" /proc/net/dev']
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).strip()
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if not check: # if check is not successful just try eth{1-10}
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for i in range(10):
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try:
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self.interface = self.node.exec_in_container(
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[
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"bash",
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"-c",
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f"awk '{{print $1}}' /proc/net/route | grep 'eth{i}'",
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]
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).strip()
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break
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except Exception as ex:
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print(f"No interface eth{i}")
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else:
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raise Exception(
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"No interface eth{1-10} and default interface not specified in /proc/net/route, maybe some special network configuration"
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)
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try:
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check = self.node.exec_in_container(
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["bash", "-c", f'grep "^ *{self.interface}:" /proc/net/dev']
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).strip()
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if not check:
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raise Exception(
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f"No such interface {self.interface} found in /proc/net/dev"
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)
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except:
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logging.error(
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"All available interfaces %s",
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self.node.exec_in_container(["bash", "-c", "cat /proc/net/dev"]),
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)
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raise Exception(
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f"No such interface {self.interface} found in /proc/net/dev"
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)
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self.current_in = self._get_in_bytes()
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self.current_out = self._get_out_bytes()
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self.measure_time = time.time()
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def _get_in_bytes(self):
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try:
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result = self.node.exec_in_container(
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[
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"bash",
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"-c",
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f'awk "/^ *{self.interface}:/"\' {{ if ($1 ~ /.*:[0-9][0-9]*/) {{ sub(/^.*:/, "") ; print $1 }} else {{ print $2 }} }}\' /proc/net/dev',
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]
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)
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except:
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raise Exception(
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f"Cannot receive in bytes from /proc/net/dev for interface {self.interface}"
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)
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try:
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return int(result)
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except:
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raise Exception(
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f"Got non-numeric in bytes '{result}' from /proc/net/dev for interface {self.interface}"
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)
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def _get_out_bytes(self):
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try:
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result = self.node.exec_in_container(
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[
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"bash",
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"-c",
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f"awk \"/^ *{self.interface}:/\"' {{ if ($1 ~ /.*:[0-9][0-9]*/) {{ print $9 }} else {{ print $10 }} }}' /proc/net/dev",
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]
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)
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except:
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raise Exception(
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f"Cannot receive out bytes from /proc/net/dev for interface {self.interface}"
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)
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try:
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return int(result)
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except:
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raise Exception(
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f"Got non-numeric out bytes '{result}' from /proc/net/dev for interface {self.interface}"
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)
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def measure_speed(self, measure="bytes"):
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new_in = self._get_in_bytes()
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new_out = self._get_out_bytes()
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current_time = time.time()
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in_speed = (new_in - self.current_in) / (current_time - self.measure_time)
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out_speed = (new_out - self.current_out) / (current_time - self.measure_time)
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self.current_out = new_out
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self.current_in = new_in
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self.measure_time = current_time
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if measure == "bytes":
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return in_speed, out_speed
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elif measure == "kilobytes":
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return in_speed / 1024.0, out_speed / 1024.0
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elif measure == "megabytes":
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return in_speed / (1024 * 1024), out_speed / (1024 * 1024)
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else:
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raise Exception(f"Unknown measure {measure}")
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