# Docker Input Plugin

The docker plugin uses the Docker Engine API to gather metrics on running
docker containers.

The docker plugin uses the [Official Docker Client](https://github.com/moby/moby/tree/master/client)
to gather stats from the [Engine API](https://docs.docker.com/engine/api/v1.24/).

### Configuration:

```toml
# Read metrics about docker containers
[[inputs.docker]]
  ## Docker Endpoint
  ##   To use TCP, set endpoint = "tcp://[ip]:[port]"
  ##   To use environment variables (ie, docker-machine), set endpoint = "ENV"
  endpoint = "unix:///var/run/docker.sock"

  ## Set to true to collect Swarm metrics(desired_replicas, running_replicas)
  ## Note: configure this in one of the manager nodes in a Swarm cluster.
  ## configuring in multiple Swarm managers results in duplication of metrics.
  gather_services = false

  ## Only collect metrics for these containers. Values will be appended to
  ## container_name_include.
  ## Deprecated (1.4.0), use container_name_include
  container_names = []

  ## Containers to include and exclude. Collect all if empty. Globs accepted.
  container_name_include = []
  container_name_exclude = []

  ## Container states to include and exclude. Globs accepted.
  ## When empty only containers in the "running" state will be captured.
  # container_state_include = []
  # container_state_exclude = []

  ## Timeout for docker list, info, and stats commands
  timeout = "5s"

  ## Whether to report for each container per-device blkio (8:0, 8:1...) and
  ## network (eth0, eth1, ...) stats or not
  perdevice = true

  ## Whether to report for each container total blkio and network stats or not
  total = false

  ## docker labels to include and exclude as tags.  Globs accepted.
  ## Note that an empty array for both will include all labels as tags
  docker_label_include = []
  docker_label_exclude = []

  ## Which environment variables should we use as a tag
  tag_env = ["JAVA_HOME", "HEAP_SIZE"]

  ## Optional TLS Config
  # tls_ca = "/etc/telegraf/ca.pem"
  # tls_cert = "/etc/telegraf/cert.pem"
  # tls_key = "/etc/telegraf/key.pem"
  ## Use TLS but skip chain & host verification
  # insecure_skip_verify = false
```

#### Environment Configuration

When using the `"ENV"` endpoint, the connection is configured using the
[cli Docker environment variables](https://godoc.org/github.com/moby/moby/client#NewEnvClient).

#### Security

Giving telegraf access to the Docker daemon expands the [attack surface](https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface) that could result in an attacker gaining root access to a machine. This is especially relevant if the telegraf configuration can be changed by untrusted users.

#### Docker Daemon Permissions

Typically, telegraf must be given permission to access the docker daemon unix
socket when using the default endpoint. This can be done by adding the
`telegraf` unix user (created when installing a Telegraf package) to the
`docker` unix group with the following command:

```
sudo usermod -aG docker telegraf
```

If telegraf is run within a container, the unix socket will need to be exposed
within the telegraf container. This can be done in the docker CLI by add the
option `-v /var/run/docker.sock:/var/run/docker.sock` or adding the following
lines to the telegraf container definition in a docker compose file:

```
volumes:
  - /var/run/docker.sock:/var/run/docker.sock
```

#### Kubernetes Labels

Kubernetes may add many labels to your containers, if they are not needed you
may prefer to exclude them:
```
  docker_label_exclude = ["annotation.kubernetes*"]
```

### Metrics:

- docker
  - tags:
    - unit
    - engine_host
    - server_version
  - fields:
    - n_used_file_descriptors
    - n_cpus
    - n_containers
    - n_containers_running
    - n_containers_stopped
    - n_containers_paused
    - n_images
    - n_goroutines
    - n_listener_events
    - memory_total
    - pool_blocksize (requires devicemapper storage driver)

The `docker_data` and `docker_metadata` measurements are available only for
some storage drivers such as devicemapper.

- docker_data
  - tags:
    - unit
    - engine_host
    - server_version
  - fields:
    - available
    - total
    - used

- docker_metadata
  - tags:
    - unit
    - engine_host
    - server_version
  - fields:
    - available
    - total
    - used

- docker_container_mem
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
  - fields:
    - total_pgmafault
    - cache
    - mapped_file
    - total_inactive_file
    - pgpgout
    - rss
    - total_mapped_file
    - writeback
    - unevictable
    - pgpgin
    - total_unevictable
    - pgmajfault
    - total_rss
    - total_rss_huge
    - total_writeback
    - total_inactive_anon
    - rss_huge
    - hierarchical_memory_limit
    - total_pgfault
    - total_active_file
    - active_anon
    - total_active_anon
    - total_pgpgout
    - total_cache
    - inactive_anon
    - active_file
    - pgfault
    - inactive_file
    - total_pgpgin
    - max_usage
    - usage
    - failcnt
    - limit
    - container_id

- docker_container_cpu
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
    - cpu
  - fields:
    - throttling_periods
    - throttling_throttled_periods
    - throttling_throttled_time
    - usage_in_kernelmode
    - usage_in_usermode
    - usage_system
    - usage_total
    - usage_percent
    - container_id

- docker_container_net
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
    - network
  - fields:
    - rx_dropped
    - rx_bytes
    - rx_errors
    - tx_packets
    - tx_dropped
    - rx_packets
    - tx_errors
    - tx_bytes
    - container_id

- docker_container_blkio
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
    - device
  - fields:
    - io_service_bytes_recursive_async
    - io_service_bytes_recursive_read
    - io_service_bytes_recursive_sync
    - io_service_bytes_recursive_total
    - io_service_bytes_recursive_write
    - io_serviced_recursive_async
    - io_serviced_recursive_read
    - io_serviced_recursive_sync
    - io_serviced_recursive_total
    - io_serviced_recursive_write
    - container_id

The `docker_container_health` measurements report on a containers
[HEALTHCHECK](https://docs.docker.com/engine/reference/builder/#healthcheck)
status if configured.

- docker_container_health (container must use the HEALTHCHECK)
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
  - fields:
  	- health_status (string)
  	- failing_streak (integer)

- docker_container_status
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
  - fields:
    - oomkilled (boolean)
    - pid (integer)
    - exitcode (integer)
    - started_at (integer)
    - finished_at (integer)

- docker_swarm
  - tags:
    - service_id
    - service_name
    - service_mode
  - fields:
    - tasks_desired
    - tasks_running

### Example Output:

```
docker,engine_host=debian-stretch-docker,server_version=17.09.0-ce n_containers=6i,n_containers_paused=0i,n_containers_running=1i,n_containers_stopped=5i,n_cpus=2i,n_goroutines=41i,n_images=2i,n_listener_events=0i,n_used_file_descriptors=27i 1524002041000000000
docker,engine_host=debian-stretch-docker,server_version=17.09.0-ce,unit=bytes memory_total=2101661696i 1524002041000000000
docker_container_mem,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,engine_host=debian-stretch-docker,server_version=17.09.0-ce active_anon=8327168i,active_file=2314240i,cache=27402240i,container_id="adc4ba9593871bf2ab95f3ffde70d1b638b897bb225d21c2c9c84226a10a8cf4",hierarchical_memory_limit=9223372036854771712i,inactive_anon=0i,inactive_file=25088000i,limit=2101661696i,mapped_file=20582400i,max_usage=36646912i,pgfault=4193i,pgmajfault=214i,pgpgin=9243i,pgpgout=520i,rss=8327168i,rss_huge=0i,total_active_anon=8327168i,total_active_file=2314240i,total_cache=27402240i,total_inactive_anon=0i,total_inactive_file=25088000i,total_mapped_file=20582400i,total_pgfault=4193i,total_pgmajfault=214i,total_pgpgin=9243i,total_pgpgout=520i,total_rss=8327168i,total_rss_huge=0i,total_unevictable=0i,total_writeback=0i,unevictable=0i,usage=36528128i,usage_percent=0.4342225020025297,writeback=0i 1524002042000000000
docker_container_cpu,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,cpu=cpu-total,engine_host=debian-stretch-docker,server_version=17.09.0-ce container_id="adc4ba9593871bf2ab95f3ffde70d1b638b897bb225d21c2c9c84226a10a8cf4",throttling_periods=0i,throttling_throttled_periods=0i,throttling_throttled_time=0i,usage_in_kernelmode=40000000i,usage_in_usermode=100000000i,usage_percent=0,usage_system=6394210000000i,usage_total=117319068i 1524002042000000000
docker_container_cpu,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,cpu=cpu0,engine_host=debian-stretch-docker,server_version=17.09.0-ce container_id="adc4ba9593871bf2ab95f3ffde70d1b638b897bb225d21c2c9c84226a10a8cf4",usage_total=20825265i 1524002042000000000
docker_container_cpu,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,cpu=cpu1,engine_host=debian-stretch-docker,server_version=17.09.0-ce container_id="adc4ba9593871bf2ab95f3ffde70d1b638b897bb225d21c2c9c84226a10a8cf4",usage_total=96493803i 1524002042000000000
docker_container_net,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,engine_host=debian-stretch-docker,network=eth0,server_version=17.09.0-ce container_id="adc4ba9593871bf2ab95f3ffde70d1b638b897bb225d21c2c9c84226a10a8cf4",rx_bytes=1576i,rx_dropped=0i,rx_errors=0i,rx_packets=20i,tx_bytes=0i,tx_dropped=0i,tx_errors=0i,tx_packets=0i 1524002042000000000
docker_container_blkio,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,device=254:0,engine_host=debian-stretch-docker,server_version=17.09.0-ce container_id="adc4ba9593871bf2ab95f3ffde70d1b638b897bb225d21c2c9c84226a10a8cf4",io_service_bytes_recursive_async=27398144i,io_service_bytes_recursive_read=27398144i,io_service_bytes_recursive_sync=0i,io_service_bytes_recursive_total=27398144i,io_service_bytes_recursive_write=0i,io_serviced_recursive_async=529i,io_serviced_recursive_read=529i,io_serviced_recursive_sync=0i,io_serviced_recursive_total=529i,io_serviced_recursive_write=0i 1524002042000000000
docker_container_health,container_image=telegraf,container_name=zen_ritchie,container_status=running,container_version=unknown,engine_host=debian-stretch-docker,server_version=17.09.0-ce failing_streak=0i,health_status="healthy" 1524007529000000000
docker_swarm,service_id=xaup2o9krw36j2dy1mjx1arjw,service_mode=replicated,service_name=test tasks_desired=3,tasks_running=3 1508968160000000000
```
