Docker Volume with Local Persist

Create a docker volume with mount-point using local-persist docker plugin. (Ubuntu only. For other OS please refer to https://github.com/CWSpear/local-persist)

Install

curl -fsSL https://raw.githubusercontent.com/CWSpear/local-persist/master/scripts/install.sh | sudo bash -s -- --systemd

Linux Change Timezone

Command

sudo dpkg-reconfigure tzdata

Docker Volume with SSHFS

Using an ssh key

Linux rename file names

Just use the for loop: (rename txt file to csv file)

for j in *.txt; do mv -v "${j}" "${j%.txt}.csv"; done

JavaScript formats a number using fixed-point notation

Method: Number.toFixed()
Example:

Number.parseFloat(x).toFixed(2);

Linux Workspace Shortcuts

Ctrl+Alt and tap an arrow key to quickly move up, down, left, or right between workspaces
Shift+Ctrl+Alt and tap an arrow key to switch between workspaces.

Docker Containers Have No Access Internert

Problem
Docker containers cannot access the network. The host can normal and containers have no problem to access the host.

LVM Extend ROOT with EXT4 File System

Problem: root partition was full.

$ df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               3.9G     0  3.9G   0% /dev
tmpfs                              799M   67M  732M   9% /run
/dev/mapper/silver--vg-root         37G   36G     0 100% /
...

SSH Certificate Authentication

Generate ssh certificate

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

LXD 3.0 Container with Container Commands

Use init instead of launch to create new container.
```
lxc init ubuntu:18.04 c1
```