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Querying Loki with LogCLI

If you prefer a command line interface, LogCLI also allows users to run LogQL queries against a Loki server.

Installation

Binary (Recommended)

Every release includes binaries for logcli which can be found on the Releases page.

From source

Use go get to install logcli to $GOPATH/bin:

$ go get github.com/grafana/loki/cmd/logcli

Usage

Example

If you are running on Grafana Cloud, use:

$ 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 without needing a username and password:

$ export LOKI_ADDR=http://localhost:3100

Note: If you are running Loki behind a proxy server and you have authentication configured, you will also have to pass in LOKI_USERNAME and LOKI_PASSWORD accordingly.

$ logcli labels job
https://logs-dev-ops-tools1.grafana.net/api/prom/label/job/values
cortex-ops/consul
cortex-ops/cortex-gw
...

$ logcli query '{job="cortex-ops/consul"}'
https://logs-dev-ops-tools1.grafana.net/api/prom/query?query=%7Bjob%3D%22cortex-ops%2Fconsul%22%7D&limit=30&start=1529928228&end=1529931828&direction=backward&regexp=
Common labels: {job="cortex-ops/consul", namespace="cortex-ops"}
2018-06-25T12:52:09Z {instance="consul-8576459955-pl75w"} 2018/06/25 12:52:09 [INFO] raft: Snapshot to 475409 complete
2018-06-25T12:52:09Z {instance="consul-8576459955-pl75w"} 2018/06/25 12:52:09 [INFO] raft: Compacting logs from 456973 to 465169
...

$ 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"}

Configuration

Configuration values are considered in the following order (lowest to highest):

  • Environment variables
  • Command line flags

Details

$ 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).
      --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]
      --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. Can also be set using LOKI_TLS_SKIP_VERIFY env var.
      --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=ORG-ID    adds X-Scope-OrgID to API requests for representing tenant ID. Useful for requesting tenant data when bypassing an auth gateway. Can also be set using LOKI_ORG_ID env var.

Commands:
  help [<command>...]
    Show help.

  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:

      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 "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.

    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.

  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.

    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:

    https://github.com/grafana/loki/blob/master/docs/logql.md

  labels [<label>]
    Find values for a given label.

  series --match=MATCH [<flags>]
    Run series query.

$ logcli help query
usage: logcli query [<flags>] <query>

Run a LogQL query.

Flags:
      --help             Show context-sensitive help (also try --help-long and --help-man).
      --version          Show application version.
  -q, --quiet            suppress everything but log lines
  -o, --output=default   specify output mode [default, raw, jsonl]
  -z, --timezone=Local   Specify the timezone to use when formatting output timestamps [Local, UTC]
      --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.
      --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
      --forward          Scan forwards through logs.
      --no-labels        Do not print any labels
      --exclude-label=EXCLUDE-LABEL ...  
                         Exclude labels given the provided key during output.
      --include-label=INCLUDE-LABEL ...  
                         Include labels given the provided key during output.
      --labels-length=0  Set a fixed padding to 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
usage: logcli labels [<label>]

Find values for a given label.

Flags:
      --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]
      --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=ORG-ID    adds X-Scope-OrgID to API requests for representing tenant ID. Useful for requesting tenant data when bypassing an auth gateway.

Args:
  [<label>]  The name of the label.

$ logcli help series
usage: logcli series --match=MATCH [<flags>]

Run series query.

Flags:
      --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]
      --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=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"}'