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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 keywords: docker, logging, driver, syslog, Fluentd, gelf, journald
title: Customize log driver output title: Customize log driver output
aliases: aliases:
@ -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: Docker supports some special template markup you can use when specifying a tag's value:
| Markup | Description | | Markup | Description |
|--------------------|------------------------------------------------------| | ------------------ | ---------------------------------------------------- |
| `{{.ID}}` | The first 12 characters of the container ID. | | `{{.ID}}` | The first 12 characters of the container ID. |
| `{{.FullID}}` | The full container ID. | | `{{.FullID}}` | The full container ID. |
| `{{.Name}}` | The container name. | | `{{.Name}}` | The container name. |
| `{{.ImageID}}` | The first 12 characters of the container's image ID. | | `{{.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. | | `{{.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: 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 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 reflected in the log messages. Instead, these messages continue to use the
original container name. original container name.