262 lines
13 KiB
Markdown
262 lines
13 KiB
Markdown
# Access Logs
|
|
|
|
Who Calls Whom?
|
|
{.subtitle}
|
|
|
|
By default, logs are written to stdout, in text format.
|
|
|
|
## Configuration
|
|
|
|
To enable the access logs:
|
|
|
|
```yaml tab="File (YAML)"
|
|
accessLog: {}
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[accessLog]
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--accesslog=true
|
|
```
|
|
|
|
### `filePath`
|
|
|
|
By default access logs are written to the standard output.
|
|
To write the logs into a log file, use the `filePath` option.
|
|
|
|
```yaml tab="File (YAML)"
|
|
accessLog:
|
|
filePath: "/path/to/access.log"
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[accessLog]
|
|
filePath = "/path/to/access.log"
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--accesslog.filepath=/path/to/access.log
|
|
```
|
|
|
|
### `format`
|
|
|
|
By default, logs are written using the Common Log Format (CLF).
|
|
To write logs in JSON, use `json` in the `format` option.
|
|
If the given format is unsupported, the default (CLF) is used instead.
|
|
|
|
!!! info "Common Log Format"
|
|
|
|
```html
|
|
<remote_IP_address> - <client_user_name_if_available> [<timestamp>] "<request_method> <request_path> <request_protocol>" <origin_server_HTTP_status> <origin_server_content_size> "<request_referrer>" "<request_user_agent>" <number_of_requests_received_since_Traefik_started> "<Traefik_router_name>" "<Traefik_server_URL>" <request_duration_in_ms>ms
|
|
```
|
|
|
|
### `bufferingSize`
|
|
|
|
To write the logs in an asynchronous fashion, specify a `bufferingSize` option.
|
|
This option represents the number of log lines Traefik will keep in memory before writing them to the selected output.
|
|
In some cases, this option can greatly help performances.
|
|
|
|
```yaml tab="File (YAML)"
|
|
# Configuring a buffer of 100 lines
|
|
accessLog:
|
|
filePath: "/path/to/access.log"
|
|
bufferingSize: 100
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
# Configuring a buffer of 100 lines
|
|
[accessLog]
|
|
filePath = "/path/to/access.log"
|
|
bufferingSize = 100
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
# Configuring a buffer of 100 lines
|
|
--accesslog.filepath=/path/to/access.log
|
|
--accesslog.bufferingsize=100
|
|
```
|
|
|
|
### Filtering
|
|
|
|
To filter logs, you can specify a set of filters which are logically "OR-connected".
|
|
Thus, specifying multiple filters will keep more access logs than specifying only one.
|
|
|
|
The available filters are:
|
|
|
|
- `statusCodes`, to limit the access logs to requests with a status codes in the specified range
|
|
- `retryAttempts`, to keep the access logs when at least one retry has happened
|
|
- `minDuration`, to keep access logs when requests take longer than the specified duration (provided in seconds or as a valid duration format, see [time.ParseDuration](https://golang.org/pkg/time/#ParseDuration))
|
|
|
|
```yaml tab="File (YAML)"
|
|
# Configuring Multiple Filters
|
|
accessLog:
|
|
filePath: "/path/to/access.log"
|
|
format: json
|
|
filters:
|
|
statusCodes:
|
|
- "200"
|
|
- "300-302"
|
|
retryAttempts: true
|
|
minDuration: "10ms"
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
# Configuring Multiple Filters
|
|
[accessLog]
|
|
filePath = "/path/to/access.log"
|
|
format = "json"
|
|
|
|
[accessLog.filters]
|
|
statusCodes = ["200", "300-302"]
|
|
retryAttempts = true
|
|
minDuration = "10ms"
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
# Configuring Multiple Filters
|
|
--accesslog.filepath=/path/to/access.log
|
|
--accesslog.format=json
|
|
--accesslog.filters.statuscodes=200,300-302
|
|
--accesslog.filters.retryattempts
|
|
--accesslog.filters.minduration=10ms
|
|
```
|
|
|
|
### Limiting the Fields/Including Headers
|
|
|
|
You can decide to limit the logged fields/headers to a given list with the `fields.names` and `fields.headers` options.
|
|
|
|
Each field can be set to:
|
|
|
|
- `keep` to keep the value
|
|
- `drop` to drop the value
|
|
- `redact` to replace the value with "redacted"
|
|
|
|
The `defaultMode` for `fields.names` is `keep`.
|
|
|
|
The `defaultMode` for `fields.headers` is `drop`.
|
|
|
|
```yaml tab="File (YAML)"
|
|
# Limiting the Logs to Specific Fields
|
|
accessLog:
|
|
filePath: "/path/to/access.log"
|
|
format: json
|
|
fields:
|
|
defaultMode: keep
|
|
names:
|
|
ClientUsername: drop
|
|
headers:
|
|
defaultMode: keep
|
|
names:
|
|
User-Agent: redact
|
|
Authorization: drop
|
|
Content-Type: keep
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
# Limiting the Logs to Specific Fields
|
|
[accessLog]
|
|
filePath = "/path/to/access.log"
|
|
format = "json"
|
|
|
|
[accessLog.fields]
|
|
defaultMode = "keep"
|
|
|
|
[accessLog.fields.names]
|
|
"ClientUsername" = "drop"
|
|
|
|
[accessLog.fields.headers]
|
|
defaultMode = "keep"
|
|
|
|
[accessLog.fields.headers.names]
|
|
"User-Agent" = "redact"
|
|
"Authorization" = "drop"
|
|
"Content-Type" = "keep"
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
# Limiting the Logs to Specific Fields
|
|
--accesslog.filepath=/path/to/access.log
|
|
--accesslog.format=json
|
|
--accesslog.fields.defaultmode=keep
|
|
--accesslog.fields.names.ClientUsername=drop
|
|
--accesslog.fields.headers.defaultmode=keep
|
|
--accesslog.fields.headers.names.User-Agent=redact
|
|
--accesslog.fields.headers.names.Authorization=drop
|
|
--accesslog.fields.headers.names.Content-Type=keep
|
|
```
|
|
|
|
??? info "Available Fields"
|
|
|
|
| Field | Description |
|
|
|-------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|
|
| `StartUTC` | The time at which request processing started. |
|
|
| `StartLocal` | The local time at which request processing started. |
|
|
| `Duration` | The total time taken (in nanoseconds) by processing the response, including the origin server's time but not the log writing time. |
|
|
| `RouterName` | The name of the Traefik router. |
|
|
| `ServiceName` | The name of the Traefik backend. |
|
|
| `ServiceURL` | The URL of the Traefik backend. |
|
|
| `ServiceAddr` | The IP:port of the Traefik backend (extracted from `ServiceURL`) |
|
|
| `ClientAddr` | The remote address in its original form (usually IP:port). |
|
|
| `ClientHost` | The remote IP address from which the client request was received. |
|
|
| `ClientPort` | The remote TCP port from which the client request was received. |
|
|
| `ClientUsername` | The username provided in the URL, if present. |
|
|
| `RequestAddr` | The HTTP Host header (usually IP:port). This is treated as not a header by the Go API. |
|
|
| `RequestHost` | The HTTP Host server name (not including port). |
|
|
| `RequestPort` | The TCP port from the HTTP Host. |
|
|
| `RequestMethod` | The HTTP method. |
|
|
| `RequestPath` | The HTTP request URI, not including the scheme, host or port. |
|
|
| `RequestProtocol` | The version of HTTP requested. |
|
|
| `RequestScheme` | The HTTP scheme requested `http` or `https`. |
|
|
| `RequestLine` | `RequestMethod` + `RequestPath` + `RequestProtocol` |
|
|
| `RequestContentSize` | The number of bytes in the request entity (a.k.a. body) sent by the client. |
|
|
| `OriginDuration` | The time taken (in nanoseconds) by the origin server ('upstream') to return its response. |
|
|
| `OriginContentSize` | The content length specified by the origin server, or 0 if unspecified. |
|
|
| `OriginStatus` | The HTTP status code returned by the origin server. If the request was handled by this Traefik instance (e.g. with a redirect), then this value will be absent. |
|
|
| `OriginStatusLine` | `OriginStatus` + Status code explanation |
|
|
| `DownstreamStatus` | The HTTP status code returned to the client. |
|
|
| `DownstreamStatusLine` | `DownstreamStatus` + Status code explanation |
|
|
| `DownstreamContentSize` | The number of bytes in the response entity returned to the client. This is in addition to the "Content-Length" header, which may be present in the origin response. |
|
|
| `RequestCount` | The number of requests received since the Traefik instance started. |
|
|
| `GzipRatio` | The response body compression ratio achieved. |
|
|
| `Overhead` | The processing time overhead (in nanoseconds) caused by Traefik. |
|
|
| `RetryAttempts` | The amount of attempts the request was retried. |
|
|
| `TLSVersion` | The TLS version used by the connection (e.g. `1.2`) (if connection is TLS). |
|
|
| `TLSCipher` | The TLS cipher used by the connection (e.g. `TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA`) (if connection is TLS) |
|
|
|
|
## Log Rotation
|
|
|
|
Traefik will close and reopen its log files, assuming they're configured, on receipt of a USR1 signal.
|
|
This allows the logs to be rotated and processed by an external program, such as `logrotate`.
|
|
|
|
!!! warning
|
|
This does not work on Windows due to the lack of USR signals.
|
|
|
|
## Time Zones
|
|
|
|
Traefik will timestamp each log line in UTC time by default.
|
|
|
|
It is possible to configure the Traefik to timestamp in a specific timezone by ensuring the following configuration has been made in your environment:
|
|
|
|
1. Provide time zone data to `/etc/localtime` or `/usr/share/zoneinfo` (based on your distribution) or set the environment variable TZ to the desired timezone
|
|
2. Specify the field `StartLocal` by dropping the field named `StartUTC` (available on the default Common Log Format (CLF) as well as JSON)
|
|
|
|
Example utilizing Docker Compose:
|
|
|
|
```yaml
|
|
version: "3.7"
|
|
|
|
services:
|
|
traefik:
|
|
image: traefik:v2.6
|
|
environment:
|
|
- TZ=US/Alaska
|
|
command:
|
|
- --accesslog.fields.names.StartUTC=drop
|
|
- --providers.docker
|
|
ports:
|
|
- 80:80
|
|
volumes:
|
|
- /var/run/docker.sock:/var/run/docker.sock
|
|
```
|