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Kernal

获取系统运行相关数据​

1. 获取CPU信息​

cat /proc/cpuinfo

2. inxi​

# install
apt install inxi

# print info
inxi -F

查看 主流发行版 版本号和内核版本​

1. 主流发行版版本号​

lsb_release -a

2. WSL 版本号​

wslfetch

3. 内核版本和编译时间​

uname -a

查看显卡设备​

lspci 很强大，不止有这一种用法

# 列出所有 VGA 设备
lspci | grep -i vga

# 查看这个设备的详情
lspci -v -s 00:02.0

NV​

  • nvidia-smi (nvidia-smi -l 2)
  • gpustat (gpustat -cp)

AMD​

  • radeontop

Intel​

  • intel-gpu-tools

Sudo 免密码​

cd /etc/sudoers.d/

# vim {profile}
%sudo ALL=(ALL:ALL) NOPASSWD:ALL

# User rules for ubuntu
ubuntu ALL=(ALL) NOPASSWD:ALL

清理 Journal 日志​

缩减至 200M

journalctl --vacuum-size=200M

挂载 SMB 路径​

在 CentOS 下测试通过
视情况更改 vers, 在 windows server 2019 版本中, vers 1.0 不能成功挂载。(认证/加密未匹配)

refs:

yum install cifs-utils -y 

mkdir -p /nas/mirrors

mount -t cifs -o username="",password="",vers=3.0 //192.168.1.11/mirrors/ /nas/mirrors

SSH Tunnel​

# 通过 100.66.111.78 映射 192.168.50.1 的 端口 到 本地的 6800
ssh -L 6800:192.168.50.1:16800 -i wayne_key root@100.66.111.78

开机执行一段命令​

crontab -e
@reboot sleep 10 && sh -c /opt/some-scripts.sh

ICMP Ping​

出于安全考虑，某些 Linux 发行版会根据组 ID 限制发送 ICMP 数据报的权限。

2024-11-09T00:37:05Z WRN The user running cloudflared process has a GID (group ID) that is not within ping_group_range. You might need to add that user to a group within that range, or instead update the range to encompass a group the user is already in by modifying /proc/sys/net/ipv4/ping_group_range. Otherwise cloudflared will not be able to ping this network error="Group ID 0 is not between ping group 1 to 0"
2024-11-09T00:37:05Z WRN ICMP proxy feature is disabled error="cannot create ICMPv4 proxy: Group ID 0 is not between ping group 1 to 0 nor ICMPv6 proxy: socket: permission denied"

to fix that:

sudo vim /etc/sysctl.d/99-allow-ping.conf
net.ipv4.ping_group_range=0 10001

# 立即生效
sudo sysctl -p /etc/sysctl.d/99-allow-ping.conf

ref: https://opennms.discourse.group/t/how-to-allow-unprivileged-users-to-use-icmp-ping/1573

本地信任证书​

# 复制证书到指定目录下
cp http_ca.crt /usr/local/share/ca-certificates

# 更新证书
update-ca-certificates