Accessing Loki logs using LogCLI

How does developers like to access logs? common answer is command line with rich filtering capabilities.

This post to show how to access logs from your Loki server if you are using it as your Log solution.

What is Loki?

Loki is prometheus style log solution for cloud native architecture Loki project was started by Grafana Labs and with the intent to co-relate your matrices with log to get best out of it. Loki holds Apache 2 license and originally announced at KubeCon Seattle 2018.

Instructions — to Download and Setup LogCLI

Mac

wget https://github.com/grafana/loki/releases/download/v1.4.1/logcli-darwin-amd64.zip
unzip logcli-darwin-amd64.zip 
mv logcli-darwin-amd64 /usr/local/bin/logcli 
rm logcli-darwin-amd64.zip

Linux

wget https://github.com/grafana/loki/releases/download/v1.4.1/logcli-linux-amd64.zip
unzip logcli-darwin-amd64.zip
mv logcli-darwin-amd64 /usr/local/bin/logcli
rm logcli-darwin-amd64.zip

Set Environment variable

export LOKI_ADDR=<YOUR_LOKI_SERVER_ADDRESS>

Examples — LogCLI Query

Learn more about LogQL here:

grafana/loki

LogCLI help

logcli help

Check all available labels you can filter log with

logcli labels
OUTPUT >  
__name__
cluster
container_name
filename
host
source
swarm_service
swarm_stack

Filter by given label

logcli labels cluster

Filter Log by specific Cluster

logcli query '{cluster="CLUSTER_NAME"}'

Filter Log by Swarm Stack and Tail

logcli query '{cluster="CLUSTER_NAME", swarm_stack="traefik"}' --tail

Filter Log by Swarm Service

logcli query '{swarm_stack="SWARM_STACK_NAME"}'

Check all available query parameters

logcli query --help

Resources

Loki Project Home

Grafana Loki

Documentation

grafana/loki

Loki & LogCLI Releases

grafana/loki

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