Created
September 21, 2016 16:20
-
-
Save hkaj/69e6dc0b4a14ab649d2717410859d7e7 to your computer and use it in GitHub Desktop.
custom docker_daemon.py with some logging
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# (C) Datadog, Inc. 2010-2016 | |
# All rights reserved | |
# Licensed under Simplified BSD License (see LICENSE) | |
# stdlib | |
import os | |
import re | |
import requests | |
import socket | |
import urllib2 | |
from collections import defaultdict, Counter, deque | |
from math import ceil | |
# project | |
from checks import AgentCheck | |
from config import _is_affirmative | |
from utils.dockerutil import DockerUtil, MountException | |
from utils.kubeutil import KubeUtil | |
from utils.platform import Platform | |
from utils.service_discovery.sd_backend import get_sd_backend | |
from utils.service_discovery.config_stores import get_config_store | |
EVENT_TYPE = 'docker' | |
SERVICE_CHECK_NAME = 'docker.service_up' | |
SIZE_REFRESH_RATE = 5 # Collect container sizes every 5 iterations of the check | |
MAX_CGROUP_LISTING_RETRIES = 3 | |
CONTAINER_ID_RE = re.compile('[0-9a-f]{64}') | |
GAUGE = AgentCheck.gauge | |
RATE = AgentCheck.rate | |
HISTORATE = AgentCheck.generate_historate_func(["container_name"]) | |
HISTO = AgentCheck.generate_histogram_func(["container_name"]) | |
FUNC_MAP = { | |
GAUGE: {True: HISTO, False: GAUGE}, | |
RATE: {True: HISTORATE, False: RATE} | |
} | |
UNIT_MAP = { | |
'kb': 1000, | |
'mb': 1000000, | |
'gb': 1000000000, | |
'tb': 1000000000000 | |
} | |
CGROUP_METRICS = [ | |
{ | |
"cgroup": "memory", | |
"file": "memory.stat", | |
"metrics": { | |
"cache": ("docker.mem.cache", GAUGE), | |
"rss": ("docker.mem.rss", GAUGE), | |
"swap": ("docker.mem.swap", GAUGE), | |
}, | |
"to_compute": { | |
# We only get these metrics if they are properly set, i.e. they are a "reasonable" value | |
"docker.mem.limit": (["hierarchical_memory_limit"], lambda x: float(x) if float(x) < 2 ** 60 else None, GAUGE), | |
"docker.mem.sw_limit": (["hierarchical_memsw_limit"], lambda x: float(x) if float(x) < 2 ** 60 else None, GAUGE), | |
"docker.mem.in_use": (["rss", "hierarchical_memory_limit"], lambda x,y: float(x)/float(y) if float(y) < 2 ** 60 else None, GAUGE), | |
"docker.mem.sw_in_use": (["swap", "rss", "hierarchical_memsw_limit"], lambda x,y,z: float(x + y)/float(z) if float(z) < 2 ** 60 else None, GAUGE) | |
} | |
}, | |
{ | |
"cgroup": "cpuacct", | |
"file": "cpuacct.stat", | |
"metrics": { | |
"user": ("docker.cpu.user", RATE), | |
"system": ("docker.cpu.system", RATE), | |
}, | |
}, | |
{ | |
"cgroup": "cpu", | |
"file": "cpu.stat", | |
"metrics": { | |
"nr_throttled": ("docker.cpu.throttled", RATE) | |
}, | |
}, | |
{ | |
"cgroup": "blkio", | |
"file": 'blkio.throttle.io_service_bytes', | |
"metrics": { | |
"io_read": ("docker.io.read_bytes", RATE), | |
"io_write": ("docker.io.write_bytes", RATE), | |
}, | |
}, | |
] | |
DEFAULT_CONTAINER_TAGS = [ | |
"docker_image", | |
"image_name", | |
"image_tag", | |
] | |
DEFAULT_PERFORMANCE_TAGS = [ | |
"container_name", | |
"docker_image", | |
"image_name", | |
"image_tag", | |
] | |
DEFAULT_IMAGE_TAGS = [ | |
'image_name', | |
'image_tag' | |
] | |
TAG_EXTRACTORS = { | |
"docker_image": lambda c: [c["Image"]], | |
"image_name": lambda c: DockerUtil.image_tag_extractor(c, 0), | |
"image_tag": lambda c: DockerUtil.image_tag_extractor(c, 1), | |
"container_command": lambda c: [c["Command"]], | |
"container_name": DockerUtil.container_name_extractor, | |
"container_id": lambda c: [c["Id"]], | |
} | |
CONTAINER = "container" | |
PERFORMANCE = "performance" | |
FILTERED = "filtered" | |
IMAGE = "image" | |
ECS_INTROSPECT_DEFAULT_PORT = 51678 | |
def get_filters(include, exclude): | |
# The reasoning is to check exclude first, so we can skip if there is no exclude | |
if not exclude: | |
return | |
filtered_tag_names = [] | |
exclude_patterns = [] | |
include_patterns = [] | |
# Compile regex | |
for rule in exclude: | |
exclude_patterns.append(re.compile(rule)) | |
filtered_tag_names.append(rule.split(':')[0]) | |
for rule in include: | |
include_patterns.append(re.compile(rule)) | |
filtered_tag_names.append(rule.split(':')[0]) | |
return set(exclude_patterns), set(include_patterns), set(filtered_tag_names) | |
class DockerDaemon(AgentCheck): | |
"""Collect metrics and events from Docker API and cgroups.""" | |
def __init__(self, name, init_config, agentConfig, instances=None): | |
if instances is not None and len(instances) > 1: | |
raise Exception("Docker check only supports one configured instance.") | |
AgentCheck.__init__(self, name, init_config, | |
agentConfig, instances=instances) | |
self.init_success = False | |
self._service_discovery = agentConfig.get('service_discovery') and \ | |
agentConfig.get('service_discovery_backend') == 'docker' | |
self.init() | |
def init(self): | |
try: | |
instance = self.instances[0] | |
# if service discovery is enabled dockerutil will need a reference to the config store | |
if self._service_discovery: | |
self.docker_util = DockerUtil( | |
agentConfig=self.agentConfig, | |
config_store=get_config_store(self.agentConfig) | |
) | |
else: | |
self.docker_util = DockerUtil() | |
self.docker_client = self.docker_util.client | |
self.docker_gateway = DockerUtil.get_gateway() | |
if Platform.is_k8s(): | |
self.kubeutil = KubeUtil() | |
# We configure the check with the right cgroup settings for this host | |
# Just needs to be done once | |
self._mountpoints = self.docker_util.get_mountpoints(CGROUP_METRICS) | |
self.cgroup_listing_retries = 0 | |
self._latest_size_query = 0 | |
self._filtered_containers = set() | |
self._disable_net_metrics = False | |
# Set tagging options | |
self.custom_tags = instance.get("tags", []) | |
self.collect_labels_as_tags = instance.get("collect_labels_as_tags", []) | |
self.kube_labels = {} | |
self.use_histogram = _is_affirmative(instance.get('use_histogram', False)) | |
performance_tags = instance.get("performance_tags", DEFAULT_PERFORMANCE_TAGS) | |
self.tag_names = { | |
CONTAINER: instance.get("container_tags", DEFAULT_CONTAINER_TAGS), | |
PERFORMANCE: performance_tags, | |
IMAGE: instance.get('image_tags', DEFAULT_IMAGE_TAGS) | |
} | |
# Set filtering settings | |
if not instance.get("exclude"): | |
self._filtering_enabled = False | |
if instance.get("include"): | |
self.log.warning("You must specify an exclude section to enable filtering") | |
else: | |
self._filtering_enabled = True | |
include = instance.get("include", []) | |
exclude = instance.get("exclude", []) | |
self._exclude_patterns, self._include_patterns, _filtered_tag_names = get_filters(include, exclude) | |
self.tag_names[FILTERED] = _filtered_tag_names | |
# Other options | |
self.collect_image_stats = _is_affirmative(instance.get('collect_images_stats', False)) | |
self.collect_container_size = _is_affirmative(instance.get('collect_container_size', False)) | |
self.collect_events = _is_affirmative(instance.get('collect_events', True)) | |
self.collect_image_size = _is_affirmative(instance.get('collect_image_size', False)) | |
self.collect_disk_stats = _is_affirmative(instance.get('collect_disk_stats', False)) | |
self.collect_ecs_tags = _is_affirmative(instance.get('ecs_tags', True)) and Platform.is_ecs_instance() | |
self.ecs_tags = {} | |
except Exception as e: | |
self.log.critical(e) | |
self.warning("Initialization failed. Will retry at next iteration") | |
else: | |
self.init_success = True | |
def check(self, instance): | |
"""Run the Docker check for one instance.""" | |
if not self.init_success: | |
# Initialization can fail if cgroups are not ready. So we retry if needed | |
# https://github.com/DataDog/dd-agent/issues/1896 | |
self.init() | |
if not self.init_success: | |
# Initialization failed, will try later | |
return | |
# Report image metrics | |
if self.collect_image_stats: | |
self._count_and_weigh_images() | |
if self.collect_ecs_tags: | |
self.refresh_ecs_tags() | |
if Platform.is_k8s(): | |
try: | |
self.kube_labels = self.kubeutil.get_kube_labels() | |
except Exception as e: | |
self.log.warning('Could not retrieve kubernetes labels: %s' % str(e)) | |
self.kube_labels = {} | |
# containers running with custom cgroups? | |
custom_cgroups = _is_affirmative(instance.get('custom_cgroups', False)) | |
# Get the list of containers and the index of their names | |
containers_by_id = self._get_and_count_containers(custom_cgroups) | |
containers_by_id = self._crawl_container_pids(containers_by_id, custom_cgroups) | |
# Send events from Docker API | |
if self.collect_events or self._service_discovery: | |
self._process_events(containers_by_id) | |
# Report performance container metrics (cpu, mem, net, io) | |
self._report_performance_metrics(containers_by_id) | |
if self.collect_container_size: | |
self._report_container_size(containers_by_id) | |
# Collect disk stats from Docker info command | |
if self.collect_disk_stats: | |
self._report_disk_stats() | |
def _count_and_weigh_images(self): | |
try: | |
tags = self._get_tags() | |
active_images = self.docker_client.images(all=False) | |
active_images_len = len(active_images) | |
all_images_len = len(self.docker_client.images(quiet=True, all=True)) | |
self.gauge("docker.images.available", active_images_len, tags=tags) | |
self.gauge("docker.images.intermediate", (all_images_len - active_images_len), tags=tags) | |
if self.collect_image_size: | |
self._report_image_size(active_images) | |
except Exception as e: | |
# It's not an important metric, keep going if it fails | |
self.warning("Failed to count Docker images. Exception: {0}".format(e)) | |
def _get_and_count_containers(self, custom_cgroups=False): | |
"""List all the containers from the API, filter and count them.""" | |
# Querying the size of containers is slow, we don't do it at each run | |
must_query_size = self.collect_container_size and self._latest_size_query == 0 | |
self._latest_size_query = (self._latest_size_query + 1) % SIZE_REFRESH_RATE | |
running_containers_count = Counter() | |
all_containers_count = Counter() | |
try: | |
containers = self.docker_client.containers(all=True, size=must_query_size) | |
except Exception as e: | |
message = "Unable to list Docker containers: {0}".format(e) | |
self.service_check(SERVICE_CHECK_NAME, AgentCheck.CRITICAL, | |
message=message) | |
raise Exception(message) | |
else: | |
self.service_check(SERVICE_CHECK_NAME, AgentCheck.OK) | |
# Filter containers according to the exclude/include rules | |
self._filter_containers(containers) | |
containers_by_id = {} | |
for container in containers: | |
container_name = DockerUtil.container_name_extractor(container)[0] | |
container_status_tags = self._get_tags(container, CONTAINER) | |
all_containers_count[tuple(sorted(container_status_tags))] += 1 | |
if self._is_container_running(container): | |
running_containers_count[tuple(sorted(container_status_tags))] += 1 | |
# Check if the container is included/excluded via its tags | |
if self._is_container_excluded(container): | |
self.log.debug("Container {0} is excluded".format(container_name)) | |
continue | |
containers_by_id[container['Id']] = container | |
# grab pid via API if custom cgroups - otherwise we won't find process when | |
# crawling for pids. | |
if custom_cgroups: | |
try: | |
inspect_dict = self.docker_client.inspect_container(container_name) | |
container['_pid'] = inspect_dict['State']['Pid'] | |
except Exception as e: | |
self.log.debug("Unable to inspect Docker container: %s", e) | |
for tags, count in running_containers_count.iteritems(): | |
self.gauge("docker.containers.running", count, tags=list(tags)) | |
for tags, count in all_containers_count.iteritems(): | |
stopped_count = count - running_containers_count[tags] | |
self.gauge("docker.containers.stopped", stopped_count, tags=list(tags)) | |
return containers_by_id | |
def _is_container_running(self, container): | |
"""Tell if a container is running, according to its status. | |
There is no "nice" API field to figure it out. We just look at the "Status" field, knowing how it is generated. | |
See: https://github.com/docker/docker/blob/v1.6.2/daemon/state.go#L35 | |
""" | |
return container["Status"].startswith("Up") or container["Status"].startswith("Restarting") | |
def _get_tags(self, entity=None, tag_type=None): | |
"""Generate the tags for a given entity (container or image) according to a list of tag names.""" | |
# Start with custom tags | |
tags = list(self.custom_tags) | |
# Collect pod names as tags on kubernetes | |
if Platform.is_k8s() and KubeUtil.POD_NAME_LABEL not in self.collect_labels_as_tags: | |
self.collect_labels_as_tags.append(KubeUtil.POD_NAME_LABEL) | |
if entity is not None: | |
pod_name = None | |
# Get labels as tags | |
labels = entity.get("Labels") | |
if labels is not None: | |
for k in self.collect_labels_as_tags: | |
if k in labels: | |
v = labels[k] | |
if k == KubeUtil.POD_NAME_LABEL and Platform.is_k8s(): | |
pod_name = v | |
k = "pod_name" | |
if "-" in pod_name: | |
replication_controller = "-".join(pod_name.split("-")[:-1]) | |
if "/" in replication_controller: # k8s <= 1.1 | |
namespace, replication_controller = replication_controller.split("/", 1) | |
elif KubeUtil.NAMESPACE_LABEL in labels: # k8s >= 1.2 | |
namespace = labels[KubeUtil.NAMESPACE_LABEL] | |
pod_name = "{0}/{1}".format(namespace, pod_name) | |
tags.append("kube_namespace:%s" % namespace) | |
tags.append("kube_replication_controller:%s" % replication_controller) | |
tags.append("pod_name:%s" % pod_name) | |
elif not v: | |
tags.append(k) | |
else: | |
tags.append("%s:%s" % (k,v)) | |
if k == KubeUtil.POD_NAME_LABEL and Platform.is_k8s() and k not in labels: | |
tags.append("pod_name:no_pod") | |
# Get entity specific tags | |
if tag_type is not None: | |
tag_names = self.tag_names[tag_type] | |
for tag_name in tag_names: | |
tag_value = self._extract_tag_value(entity, tag_name) | |
if tag_value is not None: | |
for t in tag_value: | |
tags.append('%s:%s' % (tag_name, str(t).strip())) | |
# Add ECS tags | |
if self.collect_ecs_tags: | |
entity_id = entity.get("Id") | |
if entity_id in self.ecs_tags: | |
ecs_tags = self.ecs_tags[entity_id] | |
tags.extend(ecs_tags) | |
# Add kube labels | |
if Platform.is_k8s(): | |
kube_tags = self.kube_labels.get(pod_name) | |
if kube_tags: | |
tags.extend(list(kube_tags)) | |
return tags | |
def _extract_tag_value(self, entity, tag_name): | |
"""Extra tag information from the API result (containers or images). | |
Cache extracted tags inside the entity object. | |
""" | |
if tag_name not in TAG_EXTRACTORS: | |
self.warning("{0} isn't a supported tag".format(tag_name)) | |
return | |
# Check for already extracted tags | |
if "_tag_values" not in entity: | |
entity["_tag_values"] = {} | |
if tag_name not in entity["_tag_values"]: | |
entity["_tag_values"][tag_name] = TAG_EXTRACTORS[tag_name](entity) | |
return entity["_tag_values"][tag_name] | |
def refresh_ecs_tags(self): | |
ecs_config = self.docker_client.inspect_container('ecs-agent') | |
ip = ecs_config.get('NetworkSettings', {}).get('IPAddress') | |
ports = ecs_config.get('NetworkSettings', {}).get('Ports') | |
port = ports.keys()[0].split('/')[0] if ports else None | |
if not ip: | |
port = ECS_INTROSPECT_DEFAULT_PORT | |
if Platform.is_containerized() and self.docker_gateway: | |
ip = self.docker_gateway | |
else: | |
ip = "localhost" | |
ecs_tags = {} | |
try: | |
if ip and port: | |
tasks = requests.get('http://%s:%s/v1/tasks' % (ip, port)).json() | |
for task in tasks.get('Tasks', []): | |
for container in task.get('Containers', []): | |
tags = ['task_name:%s' % task['Family'], 'task_version:%s' % task['Version']] | |
ecs_tags[container['DockerId']] = tags | |
except (requests.exceptions.HTTPError, requests.exceptions.HTTPError) as e: | |
self.log.warning("Unable to collect ECS task names: %s" % e) | |
self.ecs_tags = ecs_tags | |
def _filter_containers(self, containers): | |
if not self._filtering_enabled: | |
return | |
self._filtered_containers = set() | |
for container in containers: | |
container_tags = self._get_tags(container, FILTERED) | |
if self._are_tags_filtered(container_tags): | |
container_name = DockerUtil.container_name_extractor(container)[0] | |
self._filtered_containers.add(container_name) | |
self.log.debug("Container {0} is filtered".format(container_name)) | |
def _are_tags_filtered(self, tags): | |
if self._tags_match_patterns(tags, self._exclude_patterns): | |
if self._tags_match_patterns(tags, self._include_patterns): | |
return False | |
return True | |
return False | |
def _tags_match_patterns(self, tags, filters): | |
for rule in filters: | |
for tag in tags: | |
if re.match(rule, tag): | |
return True | |
return False | |
def _is_container_excluded(self, container): | |
"""Check if a container is excluded according to the filter rules. | |
Requires _filter_containers to run first. | |
""" | |
container_name = DockerUtil.container_name_extractor(container)[0] | |
return container_name in self._filtered_containers | |
def _report_container_size(self, containers_by_id): | |
for container in containers_by_id.itervalues(): | |
if self._is_container_excluded(container): | |
continue | |
tags = self._get_tags(container, PERFORMANCE) | |
m_func = FUNC_MAP[GAUGE][self.use_histogram] | |
if "SizeRw" in container: | |
m_func(self, 'docker.container.size_rw', container['SizeRw'], | |
tags=tags) | |
if "SizeRootFs" in container: | |
m_func( | |
self, 'docker.container.size_rootfs', container['SizeRootFs'], | |
tags=tags) | |
def _report_image_size(self, images): | |
for image in images: | |
tags = self._get_tags(image, IMAGE) | |
if 'VirtualSize' in image: | |
self.gauge('docker.image.virtual_size', image['VirtualSize'], tags=tags) | |
if 'Size' in image: | |
self.gauge('docker.image.size', image['Size'], tags=tags) | |
# Performance metrics | |
def _report_performance_metrics(self, containers_by_id): | |
containers_without_proc_root = [] | |
for container in containers_by_id.itervalues(): | |
if self._is_container_excluded(container) or not self._is_container_running(container): | |
continue | |
tags = self._get_tags(container, PERFORMANCE) | |
self._report_cgroup_metrics(container, tags) | |
if "_proc_root" not in container: | |
containers_without_proc_root.append(DockerUtil.container_name_extractor(container)[0]) | |
continue | |
self._report_net_metrics(container, tags) | |
if containers_without_proc_root: | |
message = "Couldn't find pid directory for containers: {0}. They'll be missing network metrics".format( | |
", ".join(containers_without_proc_root)) | |
if not Platform.is_k8s(): | |
self.warning(message) | |
else: | |
# On kubernetes, this is kind of expected. Network metrics will be collected by the kubernetes integration anyway | |
self.log.debug(message) | |
def _report_cgroup_metrics(self, container, tags): | |
try: | |
for cgroup in CGROUP_METRICS: | |
stat_file = self._get_cgroup_from_proc(cgroup["cgroup"], container['_pid'], cgroup['file']) | |
stats = self._parse_cgroup_file(stat_file) | |
if stats: | |
for key, (dd_key, metric_func) in cgroup['metrics'].iteritems(): | |
metric_func = FUNC_MAP[metric_func][self.use_histogram] | |
if key in stats: | |
metric_func(self, dd_key, int(stats[key]), tags=tags) | |
# Computed metrics | |
for mname, (key_list, fct, metric_func) in cgroup.get('to_compute', {}).iteritems(): | |
values = [stats[key] for key in key_list if key in stats] | |
if len(values) != len(key_list): | |
self.log.debug("Couldn't compute {0}, some keys were missing.".format(mname)) | |
continue | |
value = fct(*values) | |
metric_func = FUNC_MAP[metric_func][self.use_histogram] | |
if value is not None: | |
metric_func(self, mname, value, tags=tags) | |
except MountException as ex: | |
if self.cgroup_listing_retries > MAX_CGROUP_LISTING_RETRIES: | |
raise ex | |
else: | |
self.warning("Couldn't find the cgroup files. Skipping the CGROUP_METRICS for now." | |
"Will retry {0} times before failing.".format(MAX_CGROUP_LISTING_RETRIES - self.cgroup_listing_retries)) | |
self.cgroup_listing_retries += 1 | |
else: | |
self.cgroup_listing_retries = 0 | |
def _report_net_metrics(self, container, tags): | |
"""Find container network metrics by looking at /proc/$PID/net/dev of the container process.""" | |
if self._disable_net_metrics: | |
self.log.debug("Network metrics are disabled. Skipping") | |
return | |
proc_net_file = os.path.join(container['_proc_root'], 'net/dev') | |
try: | |
with open(proc_net_file, 'r') as fp: | |
lines = fp.readlines() | |
"""Two first lines are headers: | |
Inter-| Receive | Transmit | |
face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed | |
""" | |
for l in lines[2:]: | |
cols = l.split(':', 1) | |
interface_name = str(cols[0]).strip() | |
if interface_name == 'eth0': | |
x = cols[1].split() | |
m_func = FUNC_MAP[RATE][self.use_histogram] | |
m_func(self, "docker.net.bytes_rcvd", long(x[0]), tags) | |
m_func(self, "docker.net.bytes_sent", long(x[8]), tags) | |
break | |
except Exception as e: | |
# It is possible that the container got stopped between the API call and now | |
self.warning("Failed to report IO metrics from file {0}. Exception: {1}".format(proc_net_file, e)) | |
def _process_events(self, containers_by_id): | |
if self.collect_events is False: | |
# Crawl events for service discovery only | |
self._get_events() | |
return | |
try: | |
api_events = self._get_events() | |
aggregated_events = self._pre_aggregate_events(api_events, containers_by_id) | |
events = self._format_events(aggregated_events, containers_by_id) | |
except (socket.timeout, urllib2.URLError): | |
self.warning('Timeout when collecting events. Events will be missing.') | |
return | |
except Exception as e: | |
self.warning("Unexpected exception when collecting events: {0}. " | |
"Events will be missing".format(e)) | |
return | |
for ev in events: | |
self.log.debug("Creating event: %s" % ev['msg_title']) | |
self.event(ev) | |
def _get_events(self): | |
"""Get the list of events.""" | |
events, conf_reload_set = self.docker_util.get_events() | |
if conf_reload_set and self._service_discovery: | |
get_sd_backend(self.agentConfig).reload_check_configs = conf_reload_set | |
return events | |
def _pre_aggregate_events(self, api_events, containers_by_id): | |
# Aggregate events, one per image. Put newer events first. | |
events = defaultdict(deque) | |
for event in api_events: | |
# Skip events related to filtered containers | |
container = containers_by_id.get(event.get('id')) | |
if container is not None and self._is_container_excluded(container): | |
self.log.debug("Excluded event: container {0} status changed to {1}".format( | |
event['id'], event['status'])) | |
continue | |
# from may be missing (for network events for example) | |
if 'from' in event: | |
events[event['from']].appendleft(event) | |
return events | |
def _format_events(self, aggregated_events, containers_by_id): | |
events = [] | |
for image_name, event_group in aggregated_events.iteritems(): | |
max_timestamp = 0 | |
status = defaultdict(int) | |
status_change = [] | |
container_tags = set() | |
for event in event_group: | |
max_timestamp = max(max_timestamp, int(event['time'])) | |
status[event['status']] += 1 | |
container_name = event['id'][:11] | |
if event['id'] in containers_by_id: | |
cont = containers_by_id[event['id']] | |
container_name = DockerUtil.container_name_extractor(cont)[0] | |
container_tags.update(self._get_tags(cont, PERFORMANCE)) | |
container_tags.add('container_name:%s' % container_name) | |
status_change.append([container_name, event['status']]) | |
status_text = ", ".join(["%d %s" % (count, st) for st, count in status.iteritems()]) | |
msg_title = "%s %s on %s" % (image_name, status_text, self.hostname) | |
msg_body = ( | |
"%%%\n" | |
"{image_name} {status} on {hostname}\n" | |
"```\n{status_changes}\n```\n" | |
"%%%" | |
).format( | |
image_name=image_name, | |
status=status_text, | |
hostname=self.hostname, | |
status_changes="\n".join( | |
["%s \t%s" % (change[1].upper(), change[0]) for change in status_change]) | |
) | |
events.append({ | |
'timestamp': max_timestamp, | |
'host': self.hostname, | |
'event_type': EVENT_TYPE, | |
'msg_title': msg_title, | |
'msg_text': msg_body, | |
'source_type_name': EVENT_TYPE, | |
'event_object': 'docker:%s' % image_name, | |
'tags': list(container_tags) | |
}) | |
return events | |
def _report_disk_stats(self): | |
"""Report metrics about the volume space usage""" | |
stats = { | |
'docker.data.used': None, | |
'docker.data.total': None, | |
'docker.data.free': None, | |
'docker.metadata.used': None, | |
'docker.metadata.total': None, | |
'docker.metadata.free': None | |
# these two are calculated by _calc_percent_disk_stats | |
# 'docker.data.percent': None, | |
# 'docker.metadata.percent': None | |
} | |
info = self.docker_client.info() | |
driver_status = info.get('DriverStatus', []) | |
if not driver_status: | |
self.log.warning('Disk metrics collection is enabled but docker info did not' | |
' report any. Your storage driver might not support them, skipping.') | |
return | |
for metric in driver_status: | |
# only consider metrics about disk space | |
if len(metric) == 2 and 'Space' in metric[0]: | |
# identify Data and Metadata metrics | |
mtype = 'data' | |
if 'Metadata' in metric[0]: | |
mtype = 'metadata' | |
if 'Used' in metric[0]: | |
stats['docker.{0}.used'.format(mtype)] = metric[1] | |
elif 'Space Total' in metric[0]: | |
stats['docker.{0}.total'.format(mtype)] = metric[1] | |
elif 'Space Available' in metric[0]: | |
stats['docker.{0}.free'.format(mtype)] = metric[1] | |
stats = self._format_disk_metrics(stats) | |
stats.update(self._calc_percent_disk_stats(stats)) | |
tags = self._get_tags() | |
for name, val in stats.iteritems(): | |
if val is not None: | |
self.gauge(name, val, tags) | |
def _format_disk_metrics(self, metrics): | |
"""Cast the disk stats to float and convert them to bytes""" | |
for name, raw_val in metrics.iteritems(): | |
if raw_val: | |
val, unit = raw_val.split(' ') | |
# by default some are uppercased others lowercased. That's error prone. | |
unit = unit.lower() | |
try: | |
val = int(float(val) * UNIT_MAP[unit]) | |
metrics[name] = val | |
except KeyError: | |
self.log.error('Unrecognized unit %s for disk metric %s. Dropping it.' % (unit, name)) | |
metrics[name] = None | |
return metrics | |
def _calc_percent_disk_stats(self, stats): | |
"""Calculate a percentage of used disk space for data and metadata""" | |
mtypes = ['data', 'metadata'] | |
percs = {} | |
for mtype in mtypes: | |
used = stats.get('docker.{0}.used'.format(mtype)) | |
total = stats.get('docker.{0}.total'.format(mtype)) | |
free = stats.get('docker.{0}.free'.format(mtype)) | |
if used and total and free and ceil(total) < free + used: | |
self.log.debug('used, free, and total disk metrics may be wrong, ' | |
'used: %s, free: %s, total: %s', | |
used, free, total) | |
total = used + free | |
try: | |
if isinstance(used, int): | |
percs['docker.{0}.percent'.format(mtype)] = round(100 * float(used) / float(total), 2) | |
elif isinstance(free, int): | |
percs['docker.{0}.percent'.format(mtype)] = round(100 * (1.0 - (float(free) / float(total))), 2) | |
except ZeroDivisionError: | |
self.log.error('docker.{0}.total is 0, calculating docker.{1}.percent' | |
' is not possible.'.format(mtype, mtype)) | |
return percs | |
# Cgroups | |
def _get_cgroup_from_proc(self, cgroup, pid, filename): | |
"""Find a specific cgroup file, containing metrics to extract.""" | |
params = { | |
"file": filename, | |
} | |
return DockerUtil.find_cgroup_from_proc(self._mountpoints, pid, cgroup, self.docker_util._docker_root) % (params) | |
def _parse_cgroup_file(self, stat_file): | |
"""Parse a cgroup pseudo file for key/values.""" | |
self.log.debug("Opening cgroup file: %s" % stat_file) | |
try: | |
with open(stat_file, 'r') as fp: | |
if 'blkio' in stat_file: | |
return self._parse_blkio_metrics(fp.read().splitlines()) | |
else: | |
stats = dict(map(lambda x: x.split(' ', 1), fp.read().splitlines())) | |
self.log.info('\n\nDEBUG') | |
self.log.info('stat_file: %s' % stat_file) | |
self.log.info('stats: %s' % stats) | |
self.log.info('/DEBUG\n\n') | |
return stats | |
except IOError: | |
# It is possible that the container got stopped between the API call and now | |
self.log.info("Can't open %s. Metrics for this container are skipped." % stat_file) | |
def _parse_blkio_metrics(self, stats): | |
"""Parse the blkio metrics.""" | |
metrics = { | |
'io_read': 0, | |
'io_write': 0, | |
} | |
for line in stats: | |
if 'Read' in line: | |
metrics['io_read'] += int(line.split()[2]) | |
if 'Write' in line: | |
metrics['io_write'] += int(line.split()[2]) | |
return metrics | |
def _is_container_cgroup(self, line, selinux_policy): | |
if line[1] not in ('cpu,cpuacct', 'cpuacct,cpu', 'cpuacct') or line[2] == '/docker-daemon': | |
return False | |
if 'docker' in line[2]: # general case | |
return True | |
if 'docker' in selinux_policy: # selinux | |
return True | |
if line[2].startswith('/') and re.match(CONTAINER_ID_RE, line[2][1:]): # kubernetes | |
return True | |
return False | |
# proc files | |
def _crawl_container_pids(self, container_dict, custom_cgroups=False): | |
"""Crawl `/proc` to find container PIDs and add them to `containers_by_id`.""" | |
proc_path = os.path.join(self.docker_util._docker_root, 'proc') | |
pid_dirs = [_dir for _dir in os.listdir(proc_path) if _dir.isdigit()] | |
if len(pid_dirs) == 0: | |
self.warning("Unable to find any pid directory in {0}. " | |
"If you are running the agent in a container, make sure to " | |
'share the volume properly: "/proc:/host/proc:ro". ' | |
"See https://github.com/DataDog/docker-dd-agent/blob/master/README.md for more information. " | |
"Network metrics will be missing".format(proc_path)) | |
self._disable_net_metrics = True | |
return container_dict | |
self._disable_net_metrics = False | |
for folder in pid_dirs: | |
try: | |
path = os.path.join(proc_path, folder, 'cgroup') | |
with open(path, 'r') as f: | |
content = [line.strip().split(':') for line in f.readlines()] | |
selinux_policy = '' | |
path = os.path.join(proc_path, folder, 'attr', 'current') | |
if os.path.exists(path): | |
with open(path, 'r') as f: | |
selinux_policy = f.readlines()[0] | |
except IOError, e: | |
# Issue #2074 | |
self.log.debug("Cannot read %s, " | |
"process likely raced to finish : %s" % | |
(path, str(e))) | |
except Exception as e: | |
self.warning("Cannot read %s : %s" % (path, str(e))) | |
continue | |
try: | |
for line in content: | |
if self._is_container_cgroup(line, selinux_policy): | |
cpuacct = line[2] | |
break | |
else: | |
continue | |
matches = re.findall(CONTAINER_ID_RE, cpuacct) | |
if matches: | |
container_id = matches[-1] | |
if container_id not in container_dict: | |
self.log.debug("Container %s not in container_dict, it's likely excluded", container_id) | |
continue | |
container_dict[container_id]['_pid'] = folder | |
container_dict[container_id]['_proc_root'] = os.path.join(proc_path, folder) | |
elif custom_cgroups: # if we match by pid that should be enough (?) - O(n) ugh! | |
for _, container in container_dict.iteritems(): | |
if container.get('_pid') == int(folder): | |
container['_proc_root'] = os.path.join(proc_path, folder) | |
break | |
except Exception, e: | |
self.warning("Cannot parse %s content: %s" % (path, str(e))) | |
continue | |
return container_dict |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment