156 lines
6.1 KiB
Markdown
156 lines
6.1 KiB
Markdown
# Sampler. Visualization for any shell command.
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[](https://travis-ci.com/sqshq/sampler) [](https://goreportcard.com/report/github.com/sqshq/sampler)
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Sampler is a tool for shell commands execution, visualization and alerting. Configured with a simple YAML file.
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## Installation
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### macOS
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...
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### Linux
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...
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### Windows
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...
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## Usage
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You specify shell commands, Sampler executes them with a required rate. The output is used for visualization.
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One can sample any dynamic process right from the terminal - observe changes in the database, monitor MQ in-flight messages, trigger deployment process and get notification when it's done.
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Using Sampler is basically a 3-step process:
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- Define your configuration in a YAML file
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- Run `sampler -c config.yml`
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- Adjust components size and location on UI
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## Contents
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- [Components](#components)
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- [Runchart](#runchart)
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- [Sparkline](#sparkline)
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- [Barchart](#barchart)
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- [Gauge](#gauge)
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- [Textbox](#textbox)
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- [Asciibox](#asciibox)
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- [Bells and whistles](#bells-and-whistles)
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- [Triggers (conditional actions)](#triggers)
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- [Interactive shell (for database interaction, remote server access, etc)](#interactive-shell-support)
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- [Variables](#variables)
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- [Color theme](#color-theme)
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- [Real-world examples (contributions welcome)](#real-world-examples)
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## Components
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### Runchart
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```yml
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runcharts:
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- title: Search engine response time
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rate-ms: 500 # sampling rate, default = 1000
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scale: 2 # number of digits after sample decimal point, default = 1
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legend:
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enabled: true # enables item labels, default = true
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details: false # enables item statistics: cur/min/max/dlt values, default = true
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items:
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- label: GOOGLE
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sample: curl -o /dev/null -s -w '%{time_total}' https://www.google.com
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color: 178 # 8-bit color number, default one is chosen from a pre-defined palette
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- label: YAHOO
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sample: curl -o /dev/null -s -w '%{time_total}' https://search.yahoo.com
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- label: BING
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sample: curl -o /dev/null -s -w '%{time_total}' https://www.bing.com
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```
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### Sparkline
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```yml
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sparklines:
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- title: CPU usage
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rate-ms: 200
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scale: 0
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sample: ps -A -o %cpu | awk '{s+=$1} END {print s}'
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- title: Free memory pages
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rate-ms: 200
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scale: 0
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sample: memory_pressure | grep 'Pages free' | awk '{print $3}'
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```
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### Barchart
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```yml
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barcharts:
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- title: Local network activity
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rate-ms: 500 # sampling rate, default = 1000
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scale: 0 # number of digits after sample decimal point, default = 1
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items:
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- label: UDP bytes in
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sample: nettop -J bytes_in -l 1 -m udp | awk '{sum += $4} END {print sum}'
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- label: UDP bytes out
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sample: nettop -J bytes_out -l 1 -m udp | awk '{sum += $4} END {print sum}'
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- label: TCP bytes in
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sample: nettop -J bytes_in -l 1 -m tcp | awk '{sum += $4} END {print sum}'
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- label: TCP bytes out
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sample: nettop -J bytes_out -l 1 -m tcp | awk '{sum += $4} END {print sum}'
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```
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### Gauge
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```yml
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gauges:
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- title: Minute progress
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rate-ms: 500 # sampling rate, default = 1000
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scale: 2 # number of digits after sample decimal point, default = 1
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color: 178 # 8-bit color number, default one is chosen from a pre-defined palette
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cur:
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sample: date +%S # sample script for current value
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max:
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sample: echo 60 # sample script for max value
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min:
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sample: echo 0 # sample script for min value
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- title: Year progress
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cur:
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sample: date +%j
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max:
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sample: echo 365
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min:
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sample: echo 0
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```
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### Textbox
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```yml
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textboxes:
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- title: Local weather
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rate-ms: 10000 # sampling rate, default = 1000
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sample: curl wttr.in?0ATQF
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border: false # border around the item, default = true
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color: 178 # 8-bit color number, default is white
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- title: Docker containers stats
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rate-ms: 500
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sample: docker stats --no-stream --format "table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.PIDs}}"
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```
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### Asciibox
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```yml
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asciiboxes:
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- title: UTC time
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rate-ms: 500 # sampling rate, default = 1000
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font: 3d # font type, default = 2d
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border: false # border around the item, default = true
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color: 43 # 8-bit color number, default is white
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sample: env TZ=UTC date +%r
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```
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## Bells and whistles
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### Triggers
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Triggers allow to perform conditional actions, like visual/sound alerts or an arbitrary shell command.
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### Interactive shell support
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In addition to the `sample` command, one can specify `init` command (executed only once before sampling) and `transform` command (to post-process `sample` command output). That covers interactive shell use case, e.g. to establish connection to a database only once, and then perform polling within interactive shell session. MongoDB example: ...
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### Variables
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If the configuration file contains repeated patterns, they can be extracted into the `variables` section.
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Also variables can be specified using `-v`/`--variable` flag on startup, and any system environment variables will also be available in the scripts.
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### Color theme
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...
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## Real-world examples
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...
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