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下面介绍 podman、podman-compose 安装及使用。

文中只列出了 Ubuntu 20.04 系统的安装过程。

安装

• How to Install and Use Podman on Ubuntu 20.04

设置源

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If you created your key pair using AWS, you can use the OpenSSL tools to generate a fingerprint as follows:

$ openssl pkcs8 -in path_to_private_key -inform PEM -outform DER -topk8 -nocrypt | openssl sha1 -c

If you created a key pair using a third-party tool and uploaded the public key to AWS, you can use the OpenSSL tools to generate the fingerprint as follows:

$ openssl rsa -in path_to_private_key -pubout -outform DER | openssl md5 -c

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wireless

install wpa_supplicant and dhcpcd

sudo pacman -S wpa_supplicant dhcpcd

get wireless network interface

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// remove duplicate files
// if file content with same sha256, they are same
// usage: go run remove-duplicate-files.go <your-directory> [your-dir1 you-dir2 ...]
// run with `-dryrun` if you just want to find the duplicate files
package main

import (
	"crypto/sha256"
	"flag"
	"fmt"

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NGINX to reverse proxy websockets

主要看 location 中的，注意：

• proxy_read_timeout，默认是 60s，如果不设置长一点，会看到 websocket server 收到大量请求；然后从浏览器看，前端每分钟都在创建新的 websocket 连接；详见：http://nginx.org/en/docs/http/websocket.html
• 如果用 uvicorn，nginx 不能开启 keepalive ，否则 websocket server 会报 WARNING: Invalid HTTP request received.

map $http_upgrade $connection_upgrade {
    default upgrade;

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extend virtualbox disk

shutdown guest OS

show disk info

VBoxManage showhdinfo ~/VirtualBox\ VMs/Ubuntu/Ubuntu.vdi

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#!/bin/sh
# Last Change: 2011/10/06
# apt-fast v0.02 by Matt Parnell http://www.mattparnell.com, this thing is fully open-source
# if you do anything cool with it, let me know so I can publish or host it for you
# contact me at admin@mattparnell.com
# Special thanks to Travis/travisn000 from the PCLinux Forums for making improvements that allow
# for more complex apt-get commands. See the thread: http://www.pclinuxos.com/forum/index.php/topic,66385.0.html
# adicionar suporte aos metalinks no aria2: http://ubuntuforums.org/showthread.php?t=1493421
# veja também apt-metalink: http://github.com/tatsuhiro-t/apt-metalink

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documents

• Serving private content with signed URLs and signed cookies
• Create a key pair for a trusted key group

create key group

generate key pair

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crop image

import os

from PIL import Image


def crop_image(filename, w_h_ratio=0.75):
 img = Image.open(filename)

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journal disk usage

check journal disk usage

journalctl --disk-usage

reduce journal size