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root@lab-182:~# lsblk
NAME                      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
loop0                       7:0    0 79.9M  1 loop /snap/lxd/22923
loop1                       7:1    0 61.9M  1 loop /snap/core20/1405
loop2                       7:2    0 44.7M  1 loop /snap/snapd/15534
sda                         8:0    0   30G  0 disk
├─sda1                      8:1    0    1M  0 part
├─sda2                      8:2    0  1.8G  0 part /boot
└─sda3                      8:3    0 14.2G  0 part
  └─ubuntu--vg-ubuntu--lv 253:0    0 14.2G  0 lvm  /

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Less Cheatsheet

less {filename}

Navigation
SPACE	forward one window
b	backward one window
d	forward half window

lnthien97

#Ubuntu 22.04
# How to install Nginx using nginx-build tools.
## Install nginx-build. 

    $ wget https://github.com/cubicdaiya/nginx-build/releases/download/v0.11.6/nginx-build-linux-amd64-0.11.6.tar.gz \   
     -O  /tmp/nginx-build.tar.gz && \   
     tar -xzf  /tmp/nginx-build.tar.gz \   
     -C /usr/local/bin && \   
     chmod +x  /usr/local/bin/nginx-build    

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# CSR for single domain: abc.example.com 
openssl req -new -newkey rsa:2048 \
  -keyout abc.key \
  -nodes -out abc.csr  \
  -subj "/C=VN/ST=Ho Chi Minh/L=District 16/O=MyCompany/OU=MyTeam/CN=abc.example.com" 

# CSR for multi-domain - Subject Alternative Name (SAN): abc.example.com and xyz.example.com 
openssl req -new -newkey rsa:2048 \
  -keyout abcxyz.key \
  -nodes -out abcxyz.csr  \

lnthien97

# gdisk
gdisk /dev/sdb
-> x   extra functionality (experts only)
-> Command (? for help): x
-> z   zap (destroy) GPT data structures and exit
-> Blank out MBR? (Y/N): Y


# sgdisk
zgdisk -Z /dev/sdb

lnthien97

How to use iperf3 to test bandwidth between 2 hosts

# Ubuntu 22.04

# Install iperf3
sudo apt install iperf3

# On host-01 (10.10.10.205), run iperf3 as a server  
iperf3 -s