VictoriaMetrics/docs/VictoriaLogs/querying/vlogscli.md

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vlogsqcli is an interactive command-line tool for querying VictoriaLogs. It has the following features:

• It supports scrolling and searching over query results in the same way as less command does - see these docs.
• It supports canceling long-running queries at any time via Ctrl+C.
• It supports query history - see these docs.
• It supports diffent formats for query results (JSON, logfmt, compact, etc.) - see these docs.
• It supports live tailing - see these docs.

This tool can be obtained from the linked release pages at the changelog or from docker images:

Running vlogscli from release binary

curl -L -O https://github.com/VictoriaMetrics/VictoriaMetrics/releases/download/v0.38.0-victorialogs/vlogscli-linux-amd64-v0.38.0-victorialogs.tar.gz
tar xzf vlogscli-linux-amd64-v0.38.0-victorialogs.tar.gz
./vlogscli-prod

Running vlogscli from Docker image

docker run --rm -it docker.io/victoriametrics/vlogscli:v0.38.0-victorialogs

Configuration

By default vlogscli sends queries to http://localhost:8429/select/logsql/query. The url to query can be changed via -datasource.url command-line flag. For example, the following command instructs vlogsql sending queries to https://victoria-logs.some-domain.com/select/logsql/query:

./vlogsql -datasource.url='https://victoria-logs.some-domain.com/select/logsql/query'

If some HTTP request headers must be passed to the querying API, then set -header command-line flag. For example, the following command starts vlogsql, which queries (AccountID=123, ProjectID=456) tenant:

./vlogsql -header='AccountID: 123' -header='ProjectID: 456'

Multitenancy

AccountID and ProjectID values can be set via -accountID and -projectID command-line flags:

./vlogsql -accountID=123 -projectID=456

Querying

After the start vlogsql provides a prompt for writing LogsQL queries. The query can be multi-line. It is sent to VictoriaLogs as soon as it contains ; at the end or if a blank line follows the query. For example:

;> _time:1y | count();
executing [_time:1y | stats count(*) as "count(*)"]...; duration: 0.688s
{
  "count(*)": "1923019991"
}

vlogscli shows the actually executed query on the next line after the query input prompt. This helps debugging issues related to incorrectly written queries.

The next line after the query input prompt also shows the query duration. This helps debugging and optimizing slow queries.

Query execution can be interrupted at any time by pressing Ctrl+C.

Type q and then press Enter for exit from vlogsql (if you want to search for q word, then just wrap it into quotes: "q" or 'q').

See also:

• output modes
• query history
• scrolling query results
• live tailing

Scrolling query results

If the query response exceeds vertical screen space, vlogsql pipes query response to less utility, so you can scroll the response as needed. This allows executing queries, which potentially may return billions of rows, without any problems at both VictoriaLogs and vlogsql sides, thanks to the way how less interacts with /select/logsql/query:

• less reads the response when needed, e.g. when you scroll it down. less pauses reading the response when you stop scrolling. VictoriaLogs pauses processing the query when less stops reading the response, and automatically resumes processing the response when less continues reading it.
• less closes the response stream after exit from scroll mode (e.g. by typing q). VictoriaLogs stops query processing and frees up all the associated resources after the response stream is closed.

See also less docs and command-line integration docs for VictoriaLogs.

Live tailing

vlogsql enters live tailing mode when the query is prepended with \tail command. For example, the following query shows all the newly ingested logs with error word in real time:

;> \tail error;

By default vlogscli derives the URL for live tailing from the -datasource.url command-line flag by replacing /query with /tail at the end of -datasource.url. The URL for live tailing can be specified explicitly via -tail.url command-line flag.

Live tailing can show query results in different formats - see these docs.

Query history

vlogsql supports query history - press up and down keys for navigating the history. By default the history is stored in the vlogsql-history file at the directory where vlogsql runs, so the history is available between vlogsql runs. The path to the file can be changed via -historyFile command-line flag.

Quick tip: type some text and then press Ctrl+R for searching queries with the given text in the history. Press Ctrl+R multiple times for searching other matching queries in the history. Press Enter when the needed query is found in order to execute it. Press Ctrl+C for exit from the search history mode. See also other available shortcuts.

Output modes

By default vlogscli displays query results as prettified JSON object with every field on a separate line. Fields in every JSON object are sorted in alphabetical order. This simplifies locating the needed fields.

vlogscli supports the following output modes:

• A single JSON line per every result. Type \s and press enter for this mode.
• Multline JSON per every result. Type \m and press enter for this mode.
• Compact output. Type \c and press enter for this mode. This mode shows field values as is if the response contains a single field (for example if fields _msg pipe is used) plus optional _time field.
• Logfmt output. Type \logfmt and press enter for this mode.