# Docker Input Plugin

This plugin uses the [Docker Engine API][api] to gather metrics on running
Docker containers.

> [!NOTE]
> Make sure Telegraf has sufficient permissions to access the configured
> endpoint.

⭐ Telegraf v0.1.9
🏷️ containers
💻 all

[api]: https://docs.docker.com/engine/api

## Global configuration options <!-- @/docs/includes/plugin_config.md -->

Plugins support additional global and plugin configuration settings for tasks
such as modifying metrics, tags, and fields, creating aliases, and configuring
plugin ordering. See [CONFIGURATION.md][CONFIGURATION.md] for more details.

[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins

## Configuration

```toml @sample.conf
# 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

  ## Set the source tag for the metrics to the container ID hostname, eg first 12 chars
  source_tag = false

  ## 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.
  ## example: container_state_include = ["created", "restarting", "running", "removing", "paused", "exited", "dead"]
  ## example: container_state_exclude = ["created", "restarting", "running", "removing", "paused", "exited", "dead"]
  # container_state_include = []
  # container_state_exclude = []

  ## Objects to include for disk usage query
  ## Allowed values are "container", "image", "volume"
  ## When empty disk usage is excluded
  storage_objects = []

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

  ## Podman compatibility settings (auto-enabled when Podman detected)
  ## Cache TTL for accurate CPU percentage calculation (default: 60s)
  ## Set higher than your collection interval for accurate measurements
  ## Set to 0 to keep cache entries forever (not recommended for dynamic environments)
  # podman_cache_ttl = "60s"

  ## Specifies for which classes a per-device metric should be issued
  ## Possible values are 'cpu' (cpu0, cpu1, ...), 'blkio' (8:0, 8:1, ...) and 'network' (eth0, eth1, ...)
  # perdevice_include = ["cpu"]

  ## Specifies for which classes a total metric should be issued. Total is an aggregated of the 'perdevice_include' values.
  ## Possible values are 'cpu', 'blkio' and 'network'
  ## Total 'cpu' is reported directly by Docker daemon, and 'network' and 'blkio' totals are aggregated by this plugin.
  # total_include = ["cpu", "blkio", "network"]

  ## 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][3].

[3]: https://godoc.org/github.com/moby/moby/client#NewEnvClient

### Security

Giving telegraf access to the Docker daemon expands the [attack surface][4] 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.

[4]: https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface

### Podman Compatibility

This plugin is compatible with Podman through its Docker-compatible API.
When connected to Podman:

- The plugin automatically detects Podman by examining the server version and
  endpoint
- Uses an intelligent caching mechanism to calculate accurate CPU percentages
- Configure Podman socket endpoint, for example:
  `endpoint = "unix:///run/podman/podman.sock"`

### 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:

```shell
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.
Additionally docker `telegraf` user must be assigned to `docker` group id
from host:

```yaml
user: telegraf:<host_docker_gid>
volumes:
  - /var/run/docker.sock:/var/run/docker.sock
```

### source tag

Selecting the containers measurements can be tricky if you have many containers
with the same name.  To alleviate this issue you can set the below value to
`true`

```toml
source_tag = true
```

This will cause all measurements to have the `source` tag be set to the first 12
characters of the container id. The first 12 characters is the common hostname
for containers that have no explicit hostname set, as defined by docker.

### Kubernetes Labels

Kubernetes may add many labels to your containers, if they are not needed you
may prefer to exclude them:

```json
  docker_label_exclude = ["annotation.kubernetes*"]
```

### Docker-compose Labels

Docker-compose will add labels to your containers. You can limit restrict labels
to selected ones, e.g.

```json
  docker_label_include = [
    "com.docker.compose.config-hash",
    "com.docker.compose.container-number",
    "com.docker.compose.oneoff",
    "com.docker.compose.project",
    "com.docker.compose.service",
  ]
```

## 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) (deprecated see: `docker_devicemapper`)

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

- docker_data (deprecated see: `docker_devicemapper`)
  - tags:
    - unit
    - engine_host
    - server_version
  - fields:
    - available
    - total
    - used

- docker_metadata (deprecated see: `docker_devicemapper`)
  - tags:
    - unit
    - engine_host
    - server_version
  - fields:
    - available
    - total
    - used

The above measurements for the devicemapper storage driver can now be found in
the new `docker_devicemapper` measurement

- docker_devicemapper
  - tags:
    - engine_host
    - server_version
    - pool_name
  - fields:
    - pool_blocksize_bytes
    - data_space_used_bytes
    - data_space_total_bytes
    - data_space_available_bytes
    - metadata_space_used_bytes
    - metadata_space_total_bytes
    - metadata_space_available_bytes
    - thin_pool_minimum_free_space_bytes

- docker_container_mem
  - tags:
    - engine_host
    - server_version
    - container_image
    - container_name
    - container_status
    - container_version
  - fields:
    - total_pgmajfault
    - 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:
    - container_id
    - oomkilled (boolean)
    - pid (integer)
    - exitcode (integer)
    - started_at (integer)
    - finished_at (integer)
    - uptime_ns (integer)

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

- docker_disk_usage
  - tags:
    - engine_host
    - server_version
    - container_name
    - container_image
    - container_version
    - image_id
    - image_name
    - image_version
    - volume_name
  - fields:
    - size_rw
    - size_root_fs
    - size
    - shared_size

## Example Output

```text
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
docker_disk_usage,engine_host=docker-desktop,server_version=24.0.5 layers_size=17654519107i 1695742041000000000
docker_disk_usage,container_image=influxdb,container_name=frosty_wright,container_version=1.8,engine_host=docker-desktop,server_version=24.0.5 size_root_fs=286593526i,size_rw=538i 1695742041000000000
docker_disk_usage,engine_host=docker-desktop,image_id=7f4a1cc74046,image_name=telegraf,image_version=latest,server_version=24.0.5 shared_size=0i,size=425484494i 1695742041000000000
docker_disk_usage,engine_host=docker-desktop,server_version=24.0.5,volume_name=docker_influxdb-data size=91989940i 1695742041000000000
```
