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Docs: revise the LogCLI subsection (#3921)

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* Docs: revise the LogCLI subsection

* Update docs/sources/getting-started/logcli.md per review suggestion

Co-authored-by: Owen Diehl <ow.diehl@gmail.com>

* Incorporate review suggestion.

Co-authored-by: Owen Diehl <ow.diehl@gmail.com>
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      docs/sources/getting-started/logcli.md

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@ -1,36 +1,37 @@
---
title: LogCLI
---
# Querying Loki with LogCLI
# LogCLI, Loki's command-line interface
If you prefer a command line interface, LogCLI also allows users to run [LogQL]({{< relref "../logql/_index.md" >}})
queries against a Loki server.
LogCLI is the command-line interface to Loki.
It facilitates running [LogQL]({{< relref "../logql/_index.md" >}})
queries against a Loki instance.
## Installation
### Binary (Recommended)
Every release includes binaries for `logcli` which can be found on the
[Releases page](https://github.com/grafana/loki/releases).
Download the `logcli` binary from the
[Loki releases page](https://github.com/grafana/loki/releases).
### From source
Use `go get` to install `logcli` to `$GOPATH/bin`:
Install `logcli` to your `$GOPATH/bin`:
```
$ go get github.com/grafana/loki/cmd/logcli
go get github.com/grafana/loki/cmd/logcli
```
## Usage
## LogCLI usage
### Example
### Grafana Cloud example
If you are running on Grafana Cloud, use:
```bash
$ export LOKI_ADDR=https://logs-us-west1.grafana.net
$ export LOKI_USERNAME=<username>
$ export LOKI_PASSWORD=<password>
export LOKI_ADDR=https://logs-us-west1.grafana.net
export LOKI_USERNAME=<username>
export LOKI_PASSWORD=<password>
```
Otherwise you can point LogCLI to a local instance directly
@ -62,54 +63,78 @@ $ logcli series -q --match='{namespace="loki",container_name="loki"}'
{app="loki", container_name="loki", controller_revision_hash="loki-57c9df47f4", filename="/var/log/pods/loki_loki-0_8ed03ded-bacb-4b13-a6fe-53a445a15887/loki/0.log", instance="loki-0", job="loki/loki", name="loki", namespace="loki", release="loki", statefulset_kubernetes_io_pod_name="loki-0", stream="stderr"}
```
#### Batched Queries
### Batched queries
Starting with Loki 1.6.0, `logcli` batches log queries to Loki.
LogCLI sends queries to Loki such that query results arrive in batches.
If you set a `--limit` on a query (default is 30) to a large number, say `--limit=10000`, then logcli automatically
sends this request to Loki in batches.
The `--limit` option for a `logcli query` command caps the quantity of
log lines for a single query.
When not set, `--limit` defaults to 30.
The limit protects the user from overwhelming the system
for cases in which the specified query would have returned a large quantity
of log lines.
The limit also protects the user from unexpectedly large responses.
The default batch size is `1000`.
The quantity of log line results that arrive in each batch
is set by the `--batch` option in a `logcli query` command.
When not set, `--batch` defaults to 1000.
Loki has a server-side limit for the maximum lines returned in a query (default is 5000).
Setting a `--limit` value larger than the `--batch` value causes the
requests from LogCLI to Loki to be batched.
Loki has a server-side limit that defaults to 5000 for the maximum quantity
of lines returned for a single query.
The batching of requests allows you to query for a results set that
is larger than the server-side limit,
as long as the `--batch` value is less than the server limit.
Batching allows you to make larger requests than the server-side limit as long as the `--batch` size is less than the server limit.
Please note that the query metadata is printed for each batch on `stderr`. Set the `--quiet` flag to stop this behavior.
Query metadata is output to `stderr` for each batch.
Set the `--quiet` option on the `logcli query` command line to suppress
the output of the query metadata.
### Configuration
Configuration values are considered in the following order (lowest to highest):
- Environment variables
- Command line flags
- Command-line options
### LogCLI command reference
### Details
The output of `logcli help`:
```nohighlight
$ logcli help
usage: logcli [<flags>] <command> [<args> ...]
A command-line for loki.
Flags:
--help Show context-sensitive help (also try --help-long and --help-man).
--help Show context-sensitive help (also try --help-long and
--help-man).
--version Show application version.
-q, --quiet Suppress query metadata.
--stats Show query statistics.
-o, --output=default Specify output mode [default, raw, jsonl]. raw suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output timestamps [Local, UTC].
-q, --quiet Suppress query metadata
--stats Show query statistics
-o, --output=default Specify output mode [default, raw, jsonl]. raw
suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output
timestamps [Local, UTC]
--cpuprofile="" Specify the location for writing a CPU profile.
--memprofile="" Specify the location for writing a memory profile.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env var.
--username="" Username for HTTP basic auth. Can also be set using LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be set using LOKI_CA_CERT_PATH env var.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env
var.
--username="" Username for HTTP basic auth. Can also be set using
LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using
LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be
set using LOKI_CA_CERT_PATH env var.
--tls-skip-verify Server certificate TLS skip verify.
--cert="" Path to the client certificate. Can also be set using LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing tenant ID. Useful for requesting tenant data when
--cert="" Path to the client certificate. Can also be set using
LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set
using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing
tenant ID. Useful for requesting tenant data when
bypassing an auth gateway.
Commands:
@ -119,33 +144,58 @@ Commands:
query [<flags>] <query>
Run a LogQL query.
The "query" command is useful for querying for logs. Logs can be returned in a few output modes:
The "query" command is useful for querying for logs. Logs can be returned in
a few output modes:
raw: log line
default: log timestamp + log labels + log line
jsonl: JSON response from Loki API of log line
The output of the log can be specified with the "-o" flag, for example, "-o raw" for the raw output format.
The output of the log can be specified with the "-o" flag, for example, "-o
raw" for the raw output format.
The "query" command will output extra information about the query and its
results, such as the API URL, set of common labels, and set of excluded
labels. This extra information can be suppressed with the --quiet flag.
By default we look over the last hour of data; use --since to modify or
provide specific start and end times with --from and --to respectively.
The "query" command will output extra information about the query and its results, such as the API URL, set of common labels,
and set of excluded labels. This extra information can be suppressed with the --quiet flag.
Notice that when using --from and --to then ensure to use RFC3339Nano time
format, but without timezone at the end. The local timezone will be added
automatically or if using --timezone flag.
While "query" does support metrics queries, its output contains multiple data points between the start and end query time.
This output is used to build graphs, like what is seen in the Grafana Explore graph view. If you are querying metrics and just
want the most recent data point (like what is seen in the Grafana Explore table view), then you should use the "instant-query"
command instead.
Example:
logcli query
--timezone=UTC
--from="2021-01-19T10:00:00Z"
--to="2021-01-19T20:00:00Z"
--output=jsonl
'my-query'
The output is limited to 30 entries by default; use --limit to increase.
While "query" does support metrics queries, its output contains multiple
data points between the start and end query time. This output is used to
build graphs, similar to what is seen in the Grafana Explore graph view. If
you are querying metrics and just want the most recent data point (like what
is seen in the Grafana Explore table view), then you should use the
"instant-query" command instead.
instant-query [<flags>] <query>
Run an instant LogQL query.
The "instant-query" command is useful for evaluating a metric query for a single point in time. This is equivalent to the
Grafana Explore table view; if you want a metrics query that is used to build a Grafana graph, you should use the "query"
command instead.
The "instant-query" command is useful for evaluating a metric query for a
single point in time. This is equivalent to the Grafana Explore table view;
if you want a metrics query that is used to build a Grafana graph, you
should use the "query" command instead.
This command does not produce useful output when querying for log lines; you should always use the "query" command when you
are running log queries.
This command does not produce useful output when querying for log lines; you
should always use the "query" command when you are running log queries.
For more information about log queries and metric queries, refer to the LogQL documentation:
For more information about log queries and metric queries, refer to the
LogQL documentation:
https://grafana.com/docs/loki/latest/logql/
@ -155,128 +205,226 @@ Commands:
series [<flags>] <matcher>
Run series query.
$ logcli help query
The "series" command will take the provided label matcher and return all the
log streams found in the time window.
It is possible to send an empty label matcher '{}' to return all streams.
Use the --analyze-labels flag to get a summary of the labels found in all
streams. This is helpful to find high cardinality labels.
```
### LogCLI query command reference
The output of `logcli help query`:
```
usage: logcli query [<flags>] <query>
Run a LogQL query.
The "query" command is useful for querying for logs. Logs can be returned in a few output modes:
The "query" command is useful for querying for logs. Logs can be returned in a
few output modes:
raw: log line
default: log timestamp + log labels + log line
jsonl: JSON response from Loki API of log line
The output of the log can be specified with the "-o" flag, for example, "-o raw" for the raw output format.
The output of the log can be specified with the "-o" flag, for example, "-o raw"
for the raw output format.
The "query" command will output extra information about the query and its
results, such as the API URL, set of common labels, and set of excluded labels.
This extra information can be suppressed with the --quiet flag.
By default we look over the last hour of data; use --since to modify or provide
specific start and end times with --from and --to respectively.
The "query" command will output extra information about the query and its results, such as the API URL, set of common labels, and
set of excluded labels. This extra information can be suppressed with the --quiet flag.
Notice that when using --from and --to then ensure to use RFC3339Nano time
format, but without timezone at the end. The local timezone will be added
automatically or if using --timezone flag.
While "query" does support metrics queries, its output contains multiple data points between the start and end query time. This
output is used to build graphs, like what is seen in the Grafana Explore graph view. If you are querying metrics and just want the
most recent data point (like what is seen in the Grafana Explore table view), then you should use the "instant-query" command
Example:
logcli query
--timezone=UTC
--from="2021-01-19T10:00:00Z"
--to="2021-01-19T20:00:00Z"
--output=jsonl
'my-query'
The output is limited to 30 entries by default; use --limit to increase.
While "query" does support metrics queries, its output contains multiple data
points between the start and end query time. This output is used to build
graphs, similar to what is seen in the Grafana Explore graph view. If you are
querying metrics and just want the most recent data point (like what is seen in
the Grafana Explore table view), then you should use the "instant-query" command
instead.
Flags:
--help Show context-sensitive help (also try --help-long and --help-man).
--help Show context-sensitive help (also try --help-long and
--help-man).
--version Show application version.
-q, --quiet Suppress query metadata.
--stats Show query statistics.
-o, --output=default Specify output mode [default, raw, jsonl]. raw suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output timestamps [Local, UTC].
-q, --quiet Suppress query metadata
--stats Show query statistics
-o, --output=default Specify output mode [default, raw, jsonl]. raw
suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output
timestamps [Local, UTC]
--cpuprofile="" Specify the location for writing a CPU profile.
--memprofile="" Specify the location for writing a memory profile.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env var.
--username="" Username for HTTP basic auth. Can also be set using LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be set using LOKI_CA_CERT_PATH env var.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env
var.
--username="" Username for HTTP basic auth. Can also be set using
LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using
LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be
set using LOKI_CA_CERT_PATH env var.
--tls-skip-verify Server certificate TLS skip verify.
--cert="" Path to the client certificate. Can also be set using LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing tenant ID. Useful for requesting tenant data when
--cert="" Path to the client certificate. Can also be set using
LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set
using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing
tenant ID. Useful for requesting tenant data when
bypassing an auth gateway.
--limit=30 Limit on number of entries to print.
--since=1h Lookback window.
--from=FROM Start looking for logs at this absolute time (inclusive).
--to=TO Stop looking for logs at this absolute time (exclusive).
--step=STEP Query resolution step width, for metric queries. Evaluate the query at the specified step over the time
range.
--interval=INTERVAL Query interval, for log queries. Return entries at the specified interval, ignoring those between.
**This parameter is experimental, please see Issue 1779**.
--batch=1000 Query batch size to use until 'limit' is reached.
--from=FROM Start looking for logs at this absolute time
(inclusive)
--to=TO Stop looking for logs at this absolute time
(exclusive)
--step=STEP Query resolution step width, for metric queries.
Evaluate the query at the specified step over the
time range.
--interval=INTERVAL Query interval, for log queries. Return entries at
the specified interval, ignoring those between.
**This parameter is experimental, please see Issue
1779**
--batch=1000 Query batch size to use until 'limit' is reached
--forward Scan forwards through logs.
--no-labels Do not print any labels.
--exclude-label=EXCLUDE-LABEL ...
--no-labels Do not print any labels
--exclude-label=EXCLUDE-LABEL ...
Exclude labels given the provided key during output.
--include-label=INCLUDE-LABEL ...
--include-label=INCLUDE-LABEL ...
Include labels given the provided key during output.
--labels-length=0 Set a fixed padding to labels.
--store-config="" Execute the current query using a configured storage from a given Loki configuration file.
-t, --tail Tail the logs.
--delay-for=0 Delay in tailing by number of seconds to accumulate logs for re-ordering.
--colored-output Show ouput with colored labels.
--labels-length=0 Set a fixed padding to labels
--store-config="" Execute the current query using a configured storage
from a given Loki configuration file.
--colored-output Show output with colored labels
-t, --tail Tail the logs
--delay-for=0 Delay in tailing by number of seconds to accumulate
logs for re-ordering
Args:
<query> eg '{foo="bar",baz=~".*blip"} |~ ".*error.*"'
```
$ logcli help labels
### LogCLI labels command reference
The output of `logcli help labels`:
```
usage: logcli labels [<flags>] [<label>]
Find values for a given label.
Flags:
--help Show context-sensitive help (also try --help-long and --help-man).
--help Show context-sensitive help (also try --help-long and
--help-man).
--version Show application version.
-q, --quiet Suppress query metadata.
--stats Show query statistics.
-o, --output=default Specify output mode [default, raw, jsonl]. raw suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output timestamps [Local, UTC].
-q, --quiet Suppress query metadata
--stats Show query statistics
-o, --output=default Specify output mode [default, raw, jsonl]. raw
suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output
timestamps [Local, UTC]
--cpuprofile="" Specify the location for writing a CPU profile.
--memprofile="" Specify the location for writing a memory profile.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env var.
--username="" Username for HTTP basic auth. Can also be set using LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be set using LOKI_CA_CERT_PATH env var.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env
var.
--username="" Username for HTTP basic auth. Can also be set using
LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using
LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be
set using LOKI_CA_CERT_PATH env var.
--tls-skip-verify Server certificate TLS skip verify.
--cert="" Path to the client certificate. Can also be set using LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing tenant ID. Useful for requesting tenant data when
--cert="" Path to the client certificate. Can also be set using
LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set
using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing
tenant ID. Useful for requesting tenant data when
bypassing an auth gateway.
--since=1h Lookback window.
--from=FROM Start looking for labels at this absolute time (inclusive).
--to=TO Stop looking for labels at this absolute time (exclusive).
--from=FROM Start looking for labels at this absolute time
(inclusive)
--to=TO Stop looking for labels at this absolute time
(exclusive)
Args:
[<label>] The name of the label.
```
$ logcli help series
usage: logcli series --match=MATCH [<flags>]
### LogCLI series command reference
The output of `logcli help series`:
```
usage: logcli series [<flags>] <matcher>
Run series query.
The "series" command will take the provided label matcher and return all the log
streams found in the time window.
It is possible to send an empty label matcher '{}' to return all streams.
Use the --analyze-labels flag to get a summary of the labels found in all
streams. This is helpful to find high cardinality labels.
Flags:
--help Show context-sensitive help (also try --help-long and --help-man).
--help Show context-sensitive help (also try --help-long and
--help-man).
--version Show application version.
-q, --quiet Suppress query metadata.
--stats Show query statistics.
-o, --output=default Specify output mode [default, raw, jsonl]. raw suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output timestamps [Local, UTC].
-q, --quiet Suppress query metadata
--stats Show query statistics
-o, --output=default Specify output mode [default, raw, jsonl]. raw
suppresses log labels and timestamp.
-z, --timezone=Local Specify the timezone to use when formatting output
timestamps [Local, UTC]
--cpuprofile="" Specify the location for writing a CPU profile.
--memprofile="" Specify the location for writing a memory profile.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env var.
--username="" Username for HTTP basic auth. Can also be set using LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be set using LOKI_CA_CERT_PATH env var.
--addr="http://localhost:3100"
Server address. Can also be set using LOKI_ADDR env
var.
--username="" Username for HTTP basic auth. Can also be set using
LOKI_USERNAME env var.
--password="" Password for HTTP basic auth. Can also be set using
LOKI_PASSWORD env var.
--ca-cert="" Path to the server Certificate Authority. Can also be
set using LOKI_CA_CERT_PATH env var.
--tls-skip-verify Server certificate TLS skip verify.
--cert="" Path to the client certificate. Can also be set using LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing tenant ID. Useful for requesting tenant data when
--cert="" Path to the client certificate. Can also be set using
LOKI_CLIENT_CERT_PATH env var.
--key="" Path to the client certificate key. Can also be set
using LOKI_CLIENT_KEY_PATH env var.
--org-id="" adds X-Scope-OrgID to API requests for representing
tenant ID. Useful for requesting tenant data when
bypassing an auth gateway.
--since=1h Lookback window.
--from=FROM Start looking for logs at this absolute time (inclusive).
--to=TO Stop looking for logs at this absolute time (exclusive).
--match=MATCH ... eg '{foo="bar",baz=~".*blip"}'
--from=FROM Start looking for logs at this absolute time
(inclusive)
--to=TO Stop looking for logs at this absolute time (exclusive)
--analyze-labels Printout a summary of labels including count of label
value combinations, useful for debugging high
cardinality series
Args:
<matcher> eg '{foo="bar",baz=~".*blip"}'
```

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