docs: add vault debug docs (#7669)
* docs: add vault debug docs * add note about local-only targets * add note on OpenBSD and host info * address feedback
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Calvin Leung Huang
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@ -43,6 +43,7 @@
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- docs/commands/agent.html
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- docs/commands/audit/index.html
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- docs/commands/auth/index.html
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- docs/commands/debug.html
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- docs/commands/delete.html
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- docs/commands/lease/index.html
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- docs/commands/list.html
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@ -0,0 +1,150 @@
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---
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layout: "docs"
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page_title: "debug - Command"
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sidebar_title: "<code>debug</code>"
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sidebar_current: "docs-commands-debug"
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description: |-
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The "debug" command monitors a Vault server, probing information about
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it for a certain duration.
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---
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# debug
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The `debug` command starts a process that monitors a Vault server, probing
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information about it for a certain duration.
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Gathering information about the state of the Vault cluster often requires the
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operator to access all necessary information via various API calls and terminal
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commands. The `debug` command aims to provide a simple workflow that produces a
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consistent output to help operators retrieve and share information about the
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server in question.
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The `debug` command honors the same the variables that the base command
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accepts, such as the token stored via a previous login or the environment
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variables `VAULT_TOKEN` and `VAULT_ADDRESS`. The token used determines the
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permissions and, in turn, the information that `debug` may be able to collect.
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The address specified determines the target server that will be probed against.
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If the command is interrupted, the information collected up until that
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point gets persisted to an output directory.
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## Permissions
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Regardless of whether a particular target is provided, the ability for `debug`
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to fetch data for the target depends on the token provided. Some targets, such
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as `server-status`, queries unauthenticated endpoints which means that it can be
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queried all the time. Other targets require the token to have ACL permissions to
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query the matching endpoint in order to get a proper response. Any errors
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encountered during capture due to permissions or otherwise will be logged in the
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index file.
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## Capture Targets
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The `-target` flag can be specified multiple times to capture specific
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information when debug is running. By default, it captures all information.
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| Target | Description |
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|:---------------------|:----------------------------------------------------------------------------------|
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| `config` | Sanitized version of the configuration state. |
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| `host` | Information about the instance running the server, such as CPU, memory, and disk. |
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| `metrics` | Telemetry information. |
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| `pprof` | Runtime profiling data, including heap, CPU, goroutine, and trace profiling. |
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| `replication-status` | Replication status. |
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| `server-status` | Health and seal status. |
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Note that the `config`, `host`,`metrics`, and `pprof` targets are only queried
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on active and performance standby nodes due to the the fact that the information
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pertains to the local node and the request should not be forwarded.
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Additionally, host information is not available on the OpenBSD platform due to
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library limitations in fetching the data without enabling `cgo`.
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## Output Layout
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The output of the bundled information, once decompressed, is contained within a
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single directory. Each target, with the exception of profiling data, is captured
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in a single file. For each of those targets collection is represented as a JSON
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array object, with each entry captured at each interval as a JSON object.
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```text
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$ tree vault-debug-2019-10-15T21-44-49Z/
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vault-debug-2019-10-15T21-44-49Z/
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├── 2019-10-15T21-44-49Z
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│ ├── goroutine.prof
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│ ├── heap.prof
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│ ├── profile.prof
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│ └── trace.out
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├── 2019-10-15T21-45-19Z
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│ ├── goroutine.prof
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│ ├── heap.prof
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│ ├── profile.prof
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│ └── trace.out
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├── 2019-10-15T21-45-49Z
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│ ├── goroutine.prof
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│ ├── heap.prof
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│ ├── profile.prof
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│ └── trace.out
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├── 2019-10-15T21-46-19Z
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│ ├── goroutine.prof
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│ ├── heap.prof
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│ ├── profile.prof
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│ └── trace.out
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├── 2019-10-15T21-46-49Z
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│ ├── goroutine.prof
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│ └── heap.prof
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├── config.json
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├── host_info.json
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├── index.json
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├── metrics.json
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├── replication_status.json
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└── server_status.json
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```
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## Examples
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Start debug using sane defaults:
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```text
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$ vault debug
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```
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Start debug with different duration, intervals, and metrics interval values, and
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skip compression:
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```text
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$ vault debug -duration=1m -interval=10s -metrics-interval=5s -compress=false
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```
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Start debug with specific targets:
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```text
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$ vault debug -target=host -target=metrics
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```
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## Usage
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The following flags are available in addition to the [standard set of
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flags](/docs/commands/index.html) included on all commands.
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### Command Options
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- `-compress` `(bool: true)` - Toggles whether to compress output package The
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default is true.
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- `-duration` `(int or time string: "2m")` - Duration to run the command. The
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default is 2m0s.
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- `-interval` `(int or time string: "30s")` - The polling interval at which to
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collect profiling data and server state. The default is 30s.
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- `-metrics-interval` `(int or time string: "10s")` - The polling interval at
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which to collect metrics data. The default is 10s.
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- `-output` `(string)` - Specifies the output path for the debug package. Defaults
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to an time-based generated file name.
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- `-target` `(string: all targets)` - Target to capture, defaulting to all if
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none specified. This can be specified multiple times to capture multiple
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targets. Available targets are: config, host, metrics, pprof,
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replication-status, server-status.
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@ -104,6 +104,7 @@
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'tune'
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]
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},
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'debug',
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'delete',
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{
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category: 'kv',
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