justin2061

Linux中常用的監控CPU整體性能的工具有：

§ mpstat： mpstat 不但能查看所有CPU的平均信息，還能查看指定CPU的信息。

§ vmstat：只能查看所有CPU的平均信息；查看cpu隊列信息；

§ iostat: 只能查看所有CPU的平均信息。

§ sar： 與mpstat 一樣，不但能查看CPU的平均信息，還能查看指定CPU的信息。

justin2061

My Elasticsearch cheatsheet with example usage via rest api (still a work-in-progress)

Shortlinks:

• Cluster Health
  • Index Level
  • Shard Level
• Nodes Overview
• Indices Overview
• Cluster Maintenance

justin2061

justin2061

## ref: https://stackoverflow.com/questions/62764148/how-to-import-requirements-txt-from-an-existing-project-using-poetry
$reqs = @(cat requirements.txt)
for($i = 0; $i -lt $reqs.length; $i++){poetry add $reqs[$i]}

justin2061

# define base image as python slim-buster.
FROM python:3.7-slim-buster as base

## start builder stage.

# this is the first stage of the build.
# it will install all requirements.
FROM base as builder

# install all packages for chromedriver: https://gist.github.com/varyonic/dea40abcf3dd891d204ef235c6e8dd79

justin2061

# This can be added to your cron job to run right after Drupal's cron or combine them into a single command so 
# that it automatically executes when the cron run completes.
wget -q http://www.example.com/sitemap.xml -O - | egrep -o "http://www\.example\.com[^<]+" | wget -q -i - -O /dev/null --wait 1

justin2061

#!/usr/bin/env bash
set -eu

# Solves the problem with open ports with docker and ufw
# As Docker uses the nat table, the filter table FORWARD chain is used and does not touch ufw-input chains as expected.
# Even for ufw-forward chains it would not work, as DOCKER chains are inserted in front.
# This is a simple fix that worked for me.
# https://github.com/moby/moby/issues/4737#issuecomment-420264979

# Unfortunately this fix stops forwarding users origin ip to host mode configured service

justin2061

1. Disable iptables

$ sudo vim /etc/docker/daemon.json

{
  "iptables": false
}

justin2061

1. Disable iptables

$ sudo vim /etc/docker/daemon.json

{
  "iptables": false
}

justin2061

Turn a Raspberry Pi into an Astrophotography Autoguider

@codefinger

I hate when my images turn out like this:

You can barely see the Crab Nebula drifting through the frame because I didn't align my mount well. To keep my telescope fixed on an object during long exposures, I needed an autoguider. But I also hate having a laptop in the field, which is required for most autoguiding solutions. To avoid this burdensome piece of equipment, I turned a Raspberry Pi with a touchscreen case into an on-board autoguiding system for my astrophotography rig.