Common Wireshark Filter

Overall

Filter out TCP Keep-Alive packets in Wireshark and not DNS

!(tcp.flags.ack && tcp.len <= 1) and !(dns)

 

 

Element

Filter out TCP Keep-Alive packets in Wireshark

!(tcp.flags.ack && tcp.len <= 1) 

Not DNS

!(dns)

End

Play with libev 4.33 2020-03-18 (2022)

https://libev.cn/api/loop.html

clang-format-10 Ubuntu 20.04 pre-commit hook

https://stackoverflow.com/questions/55965712/how-do-i-add-clang-formatting-to-pre-commit-hook

system

cat /etc/*release

DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=20.04

DISTRIB_CODENAME=focal

DISTRIB_DESCRIPTION="Ubuntu 20.04.4 LTS"

install

clang-format --version

clang-format version 10.0.0-4ubuntu1 

hook (dont use)

I'm adding the following to the top of my REPO_ROOT/.git/hooks/pre-commit file:

for FILE in $(git diff --cached --name-only)
do
        clang-format -i $FILE
done 

The .clang-format file is placed in the REPO_ROOT. 

chmod a+x pre-commit

hook (use)

#!/usr/bin/env bash

for FILE in *

do

    if [[ "$FILE" =~ \.(c|h|cpp|cc)$ ]]

    then

        echo "processing $FILE"

        clang-format -i $FILE

    else

        echo "skip $FILE"

    fi

done

How to Install WSL 2 on Windows 10 (Updated) (2022 Nov)

 https://www.omgubuntu.co.uk/how-to-install-wsl2-on-windows-10

Hardware

Intel(R) Celeron(R) N5105 @ 2.00GHz
4 Cores 8GB 256GB, AC7265 Wifi only 300Mbps

Install (~5mins)

wsl.exe --install
shutdown /r /t 0
Windows 子系統 Linux 版正在繼續先前的安裝...
正在安裝：Ubuntu

Below may not work
Hyper-V Virtual Switch > Change Private to External > Reboot host
Cannot go to internet > Network > Bridge > Uncheck Hyper-V Extensible Virtual Switch > Can internet

Below should work

https://zhuanlan.zhihu.com/p/488442403

Set-VMSwitch WSL -NetAdapterName Wi-Fi
sudo ip addr del $(ip addr show eth0 | grep 'inet\b' | awk '{print $2}' | head -n 1) dev eth0
sudo ip addr add 192.168.1.150/24 broadcast 192.168.1.255 dev eth0
sudo ip route add 0.0.0.0/0 via 192.168.1.1 dev eth0

Test internet

$ ping -c 3 google.com
$ curl -I https://linuxhint.com/
$ ping -c 2 192.168.1.1
sudo nano /etc/resolv.conf
nameserver 192.168.1.1

File

\\wsl$\Ubuntu\home\ricky

Windows Terminal

Microsoft Store > Terminal > Install
Settings > Default Ubuntu, Last session > Save button

VSCode

Install Extension "WSL(16M)" not "Remote Development" (also Microsoft) not "Remote - SSH" (also Microsoft)

Reference

https://zhuanlan.zhihu.com/p/488442403

让 WSL2 使用桥接网络

hez2010

すもももももももものうち

WSL2 默认采用了一个 NAT 网络，这对于大多数情况而言都是没有问题的，但是如果想要把 WSL 中的服务直接暴露出来，就不得不考虑做端口转发等问题。以及如果要使用 IPv6，自带的 NAT 方案也不能满足。

因此，这种时候如果能让 WSL2 使用直接接在 NIC 上自然是最好的，可惜 Windows 中没有直接提供这样的配置选项，如果在 Hyper-V 管理器中配置 WSL 网卡为外部网络则会直接报错。

万幸的是，可以使用 PowerShell 直接进行配置，本文则记录使用 PowerShell 让 WSL2 用上桥接网络的方法。

以下内容需要以管理员身份在PowerShell内执行。

一切开始之前首先需要启动 WSL，直接运行 wsl 即可，这样 WSL 的网卡才会被自动创建出来。

然后退回 PowerShell，运行 Get-NetAdapter获取所有的网卡信息，记录想要桥接到的网卡，例如 Wi-Fi 或 Ethernet 等等，下面以 Wi-Fi 为例。

执行以下代码：

Set-VMSwitch WSL -NetAdapterName Wi-Fi

即可将 WSL 使用的网卡桥接到 Wi-Fi 这个网卡之上。

接下来进入 WSL 配置 IP 地址和网关，例如网关为 192.168.1.1，IP 设置为 192.168.1.150/24：

sudo ip addr del $(ip addr show eth0 | grep 'inet\b' | awk '{print $2}' | head -n 1) dev eth0
sudo ip addr add 192.168.1.150/24 broadcast 192.168.1.255 dev eth0
sudo ip route add 0.0.0.0/0 via 192.168.1.1 dev eth0

接下来更新名称解析服务器地址，执行 nano /etc/resolv.conf，修改其中内容为 nameserver 192.168.1.1，然后按 Ctrl+X保存退出即可。

End

Use RSync to reploy from local to remote on Ubuntu 20.04 (2022)

 https://www.tecmint.com/rsync-local-remote-file-synchronization-commands/

rsync -avzh /root/rpmpkgs root@192.168.0.141:/root/rpmpkgs

Docker commands 2022

check

sudo docker ps -a

remove

 sudo docker stop $(sudo docker ps -a -q)

sudo docker rm $(sudo docker ps -a -q)

sudo docker volume prune -f

sudo docker image prune -a

How to Setup Python Script Autorun As a Service in Ubuntu 20.04 (2022)

 https://websofttechs.com/tutorials/how-to-setup-python-script-autorun-in-ubuntu-18-04/

 

Dummy Python Program

https://www.digitalocean.com/community/questions/trying-to-change-workingdirectory-of-systemd-service-unit

[Service]

WorkingDirectory=/home/pi

 

 

nano /home/ricky/apply.py

#!/usr/bin/python3
import time, datetime, os
from pathlib import Path
Path("./logs/").mkdir(parents=True, exist_ok=True)
filename: str = datetime.datetime.now().strftime(f"./logs/%Y%m%d.%H%M%S.pid.{os.getpid()}.log")
while True:
    line: str = str(datetime.datetime.now())
    print(line)
    with open(filename, "a") as outfile:
        outfile.write(line+'\n')
    time.sleep(2)

sudo nano /lib/systemd/system/apple.service

[Unit]
Description=Apple Service
After=multi-user.target
Conflicts=getty@tty1.service

[Service]
Type=simple
WorkingDirectory=/home/ricky/
ExecStart=/usr/bin/python3 /home/ricky/apple.py
StandardInput=tty-force

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload

sudo systemctl enable apple
sudo systemctl start apple

sudo systemctl status apple

sudo systemctl restart apple

sudo systemctl stop apple
sudo systemctl disable apple

Dummy Python Program to python -m with venv

service
=======

sudo nano /lib/systemd/system/my_app.service

[Unit]

Description=MyApp  

After=multi-user.target

Conflicts=getty@tty1.service

[Service]

Type=simple

WorkingDirectory=/home/ricky/my_app

ExecStart=/home/ricky/my_app/venv/bin/python3 -m my_app --cfg /home/ricky/my_app/quant-server.yml

StandardInput=tty-force

[Install]

WantedBy=multi-user.target

systemctl
=========

sudo systemctl daemon-reload
sudo systemctl enable my_app
sudo systemctl start my_app
sudo systemctl status my_app
sudo systemctl restart my_app
sudo systemctl stop my_app
sudo systemctl disable my_app