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monasca-agent-collector Dockerfile

This image contains a containerized version of the Monasca agent collector. For more information on the Monasca project, see the wiki. It is based on the agent-base image also built in monasca-docker.

Sources: monasca-agent · monasca-docker · Dockerfile

Tags

Images in this repository are tagged as follows:

  • latest: refers to the latest stable point release, e.g. 1.6.0
  • 1.6.0, 1.6, 1: standard semver tags, based on git tags in the official repository.
  • mitaka, newton, etc: named versions following OpenStack release names built from the tip of stable/RELEASENAME branches in the repository
  • master, master-DATESTAMP: unstable testing builds from the master branch, these may have features or enhancements not available in stable releases, but are not production-ready.

Note that features in this Dockerfile, particularly relating to Docker and Kubernetes monitoring, require plugins that have not yet been officially released or merged. Until this changes, only master images may be available.

Usage

The agent collector requires at least a reachable monasca-forwarder. Access to additional services, like the Kubernetes API, is also necessary if they are to be monitored.

In environments resembling the official docker-compose or Kubernetes environments, the image does not require additional configuration parameters and can be minimally run like so:

docker run -it monasca/agent-collector:latest

However, without any plugins enabled (the default config), the agent will not collect any metrics. This agent container supports a number of "monitoring scenarios" that can be enabled via environment variables passed at container startup:

  • Docker container monitoring: On a plain Docker host, collects standard system-level metrics about each running container (e.g. cpu, memory, etc). Requires DOCKER=true.
  • Kubernetes container monitoring: Collects container metrics for a particular node from cAdvisor. Intended to be run on each node as a DaemonSet. Requires KUBERNETES=true.
  • Kubernetes API monitoring: Collects metrics about a Kubernetes cluster, including health status, node disk/memory pressure, capacities, etc. Requires KUBERNETES_API=true.
  • cAdvisor monitoring: collects host metrics from a cAdvisor instance, such as the instance embedded in the Kubernetes API server. Requires CADVISOR=true.
  • Prometheus monitoring: Scrapes metrics from applications exposing Prometheus endpoints. In Kubernetes environments, these can be detected automatically when run alongside the Kubernetes plugin. Requires PROMETHEUS=true.

Note that when running in a Kubernetes environment, additional variables must be set via the Downward API:

  • AGENT_POD_NAME: set fieldRef to fieldPath: metadata.name
  • AGENT_POD_NAMESPACE: set fieldRef to fieldPath: metadata.namespace

When monitoring parts of a Kubernetes environment externally, additional variables must be set instead, see below for details.

Configuration

Variable Default Description
LOG_LEVEL WARN Python logging level
KEYSTONE_DEFAULTS_ENABLED true Sets all OS defaults
OS_AUTH_URL http://keystone:35357/v3/ Versioned Keystone URL
OS_USERNAME monasca-agent Agent Keystone username
OS_PASSWORD password Agent Keystone password
OS_USER_DOMAIN_NAME Default Agent Keystone user domain
OS_PROJECT_NAME mini-mon Agent Keystone project name
OS_PROJECT_DOMAIN_NAME Default Agent Keystone project domain
MONASCA_URL http://monasca:8070/v2.0 Versioned Monasca API URL
HOSTNAME_FROM_KUBERNETES false If true, determine node hostname from Kubernetes
FORWARDER_URL http://localhost:17123 Monasca Agent Collector URL
AUTORESTART false Auto Restart Monasca Agent Collector
COLLECTOR_RESTART_INTERVAL 24 Interval in hours to restart Monasca Agent Collector

Note that additional variables can be specified as well, see the config template for a definitive list.

Note that the auto restart feature can be enabled if the agent collector has unchecked memory growth. The proper restart behavior must be enabled in docker or kubernetes if this feature is turned on.

Docker Plugin

This plugin is enabled when DOCKER=true. It has the following options:

  • DOCKER_ROOT: The mounted host rootfs volume. Default: /host
  • DOCKER_SOCKET: The mounted Docker socket. Default: /var/run/docker.sock

This plugin monitors Docker containers directly. It should only be used in a bare Docker environment (i.e. not Kubernetes), and requires two mounted volumes from the host:

  • Host / mounted to /host (path configurable with DOCKER_ROOT)
  • Host /var/run/docker.sock mounted to /var/run/docker.sock (path configurable with DOCKER_SOCKET)

Kubernetes Plugin

This plugin is enabled when KUBERNETES=true. It has the following options:

  • KUBERNETES_TIMEOUT: The K8s API connection timeout. Default: 3
  • KUBERNETES_NAMESPACE_ANNOTATIONS: If set, will grab annotations from namespaces to include as dimensions for metrics that are under that namespace. Should be passed in as 'annotation1,annotation2,annotation3'. Default: unset
  • KUBERNETES_MINIMUM_WHITELIST: Sets whitelist on kubernetes plugin for the following metrics pod.cpu.total_time_sec, pod.mem.cache_bytes, pod.mem.swap_bytes, pod.mem.used_bytes, pod.mem.working_set_bytes. This will alleviate the amount of load on Monasca. Default: unset

The Kubernetes plugin is intended to be run as a DaemonSet on each Kubernetes node. In order for API endpoints to be detected correctly, AGENT_POD_NAME and AGENT_POD_NAMESPACE must be set using the Downward API as described above.

Kubernetes API Plugin

This plugin is enabled when KUBERNETES_API=true. It has the following options:

  • KUBERNETES_API_HOST: If set, manually sets the location of the Kubernetes API host. Default: unset
  • KUBERNETES_API_PORT: If set, manually sets the port for of the Kubernetes API host. Only used if KUBERNETES_API_HOST is also set. Default: 8080
  • KUBERNETES_API_CUSTOM_LABELS: If set, provides a list of Kubernetes label keys to include as dimensions from gathered metrics. Labels should be comma separated strings, such as label1,label2,label3. The app label is always included regardless of this value. Default: unset
  • KUBERNETES_NAMESPACE_ANNOTATIONS: If set, will grab annotations from namespaces to include as dimensions for metrics that are under that namespace. Should be passed in as 'annotation1,annotation2,annotation3'. Default: unset
  • REPORT_PERSISTENT_STORAGE: If set, will gather bound pvc per a storage class. Will be reported by namespace and cluster wide. Default: true
  • STORAGE_PARAMETERS_DIMENSIONS: If set and report_persistent_storage is set, will grab storage class parameters as dimensions when reporting persistent storage. Should be passed in as 'parameter1,parameter2". Default: unset

The Kubernetes API plugin is intended to be run as a standalone deployment and will collect cluster-level metrics.

Prometheus Plugin

This plugin is enabled when PROMETHEUS=true. It has the following options:

  • PROMETHEUS_TIMEOUT: The connection timeout. Default: 3
  • PROMETHEUS_ENDPOINTS: A list of endpoints to scrape. If unset, they will be determined automatically via the Kubernetes API. See below for syntax. Default: unset
  • PROMETHEUS_DETECT_METHOD: When endpoints are determined automatically, this specifies the resource type to scan, one of: pod, service. Default: pod
  • PROMETHEUS_KUBERNETES_LABELS: When endpoints are determined automatically, this comma-separated list of labels will be included as dimensions (by name). Default: app

If desired, a static list of Prometheus endpoints can be provided by setting PROMETHEUS_ENDPOINTS. Entries in this list should be comma-separated. Additionally, each entry can specify a set of dimensions like so:

http://host-a/metrics,http://host-b/metrics|prop=value&prop2=value2,http://host-c

Note that setting PROMETHEUS_ENDPOINTS disables autodetection.

When autodetection is enabled, this plugin will automatically scrape all annotated Prometheus endpoints on the node the agent is running on. Ideally, it should be run alongside the Kubernetes plugin as a DaemonSet on each node.

cAdvisor_host Plugin

This plugin is enabled when CADVISOR=true. It has the following options:

  • CADVISOR_TIMEOUT: The connection timeout for the cAdvisor API. Default: 3
  • CADVISOR_URL: If set, sets the URL at which to access cAdvisor. If unset, (default) the cAdvisor host will be determined automatically via the Kubernetes API.
  • CADVISOR_MINIMUM_WHITELIST: Sets whitelist on cadvisor host plugin for the following metrics cpu.total_time_sec, mem.cache_bytes, mem.swap_bytes, mem.used_bytes, mem.working_set_bytes. This will alleviate the amount of load on Monasca. Default: unset

This plugin collects host-level metrics from a running cAdvisor instance. cAdvisor is included in kubelet when in Kubernetes environments and is necessary to retrieve host-level metrics. As with the Kubernetes plugin, AGENT_POD_NAME and AGENT_POD_NAMESPACE must be set to determine the URL automatically.

cAdvisor can be easily run in standard Docker environments or directly on host systems. In these cases, the URL must be manually provided via CADVISOR_URL.

Custom Plugins

Custom plugin configuration files can be provided to the container by mounting them to /plugins.d/*.yaml. If they have a .j2 extension, they will be processed as Jinja2 templates with access to all environment variables.

Building

dbuild can be used with the build.yml file to build and push the container.

To build the container from scratch using just docker commands, run:

docker build -t youruser/agent-collector:latest .

A few build argument can be set:

  • REBULID: a simple method to invalidate the Docker image cache. Set to --build-arg REBUILD="$(date)" to force a full image rebuild.
  • HTTP_PROXY and HTTPS_PROXY should be set as needed for your environment

If you'd like to build this image against an uncommitted working tree, consider using git-sync to mirror your local tree to a temporary git repository.