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chore: tier 1 freshness: content/config/containers/logging/log_tags.md 

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
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David Karlsson 2023-10-27 14:44:18 +02:00
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content/config/containers/logging/log_tags.md
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---
description: Describes how to format tags for.
description: Learn about how to format log output with Go templates
keywords: docker, logging, driver, syslog, Fluentd, gelf, journald
title: Customize log driver output
aliases:
- /engine/reference/logging/log_tags/
- /engine/admin/logging/log_tags/
- /engine/reference/logging/log_tags/
- /engine/admin/logging/log_tags/
---
The `tag` log option specifies how to format a tag that identifies the
@ -17,18 +17,15 @@ $ docker run --log-driver=fluentd --log-opt fluentd-address=myhost.local:24224 -
Docker supports some special template markup you can use when specifying a tag's value:
| Markup | Description |
|--------------------|------------------------------------------------------|
| ------------------ | ---------------------------------------------------- |
| `{{.ID}}` | The first 12 characters of the container ID. |
| `{{.FullID}}` | The full container ID. |
| `{{.Name}}` | The container name. |
| `{{.ImageID}}` | The first 12 characters of the container's image ID. |
| `{{.ImageFullID}}` | The container's full image ID. |
| `{{.ImageFullID}}` | The container's full image ID. |
| `{{.ImageName}}` | The name of the image used by the container. |
| `{{.DaemonName}}` | The name of the docker program (`docker`). |
| `{{.DaemonName}}` | The name of the Docker program (`docker`). |
For example, specifying a `--log-opt tag="{{.ImageName}}/{{.Name}}/{{.ID}}"` value yields `syslog` log lines like:
@ -37,6 +34,6 @@ Aug 7 18:33:19 HOSTNAME hello-world/foobar/5790672ab6a0[9103]: Hello from Docke
```
At startup time, the system sets the `container_name` field and `{{.Name}}` in
the tags. If you use `docker rename` to rename a container, the new name is not
the tags. If you use `docker rename` to rename a container, the new name isn't
reflected in the log messages. Instead, these messages continue to use the
original container name.
original container name.