podrezo/Linux Snippets.md

## Linux Snippets.md

      
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              Linux Snippets.md
            
          
    Firewall (UFW)

Common service

ufw allow ssh 

Port number

ufw allow 2222 

Port range/proto

ufw allow 6000:6007/udp 

From Specific IP

ufw allow from 203.0.113.4 

Commonly used: Samba

ufw allow proto udp to any port 137 from 192.168.0.0/16 
ufw allow proto udp to any port 138 from 192.168.0.0/16 
ufw allow proto tcp to any port 139 from 192.168.0.0/16 
ufw allow proto tcp to any port 445 from 192.168.0.0/16 

Burning ISO to Flash Drive

Check all disks and what is what:
lsblk

Unmount all partitions of USB drive:
umount /dev/sdd*

Burn it:
dd if=./something.iso of=<your USB device> oflag=sync bs=4M status=progress

Eject it:
diskutil eject /dev/disk2

Test speed of storage drive

hdparm -tT /dev/sdd 
 
/dev/sdd: 
Timing cached reads:   39402 MB in  1.99 seconds = 19848.47 MB/sec 
Timing buffered disk reads: 518 MB in  3.01 seconds = 172.19 MB/sec 

NFS Setup

Server setup

Allow firewall rules
ufw allow from 192.168.0.1/24 to any port 111 
ufw allow from 192.168.0.1/24 to any port 2049 
ufw allow from 192.168.0.1/24 to any port 20048 

Create exports
Edit /etc/exports and add the directory you want to export
/data 192.168.0.1/24(rw,insecure,sync,no_subtree_check,all_squash,anonuid=65534,anongid=65534) 

Options

Allow read and write
Doesn't care which source port requests come from
Reply to requests only after the changes have been committed to stable storage
disables subtree checking, which has mild security implications, but can improve reliability in some circumstances
Map all uids and gids to the anonymous user
NFS offers root squashing, a feature that maps uid 0 (root) to the anonymous (nfsnobody) uid, which defaults to -2 (65534 on 16 bit numbers)
This is useful for windows clients that won't have matching UIDs

Enable NFS server (arch)
systemctl enable nfs-server.service
systemctl start nfs-server.service
Refresh exports
exportfs -ra
Client Setup

Edit /etc/fstab
192.168.0.201:/data     /mnt/my-local-dir        nfs     defaults,noatime,x-systemd.automount,x-systemd.device-timeout=10,timeo=14,x-systemd.idle-timeout=1min,x-systemd.after=network-online.target,nofail 0 0 

More info
https://wiki.archlinux.org/index.php/NFS
fstab by disk UUID

Get disk UUIDs
ls -lah /dev/disk/by-uuid/ 

Mount as user-accessible
UUID=3020-85D3                    /mnt/external         exfat    defaults,noatime 0 0 

Make a new exfat disk

fdisk /dev/sdi 

g--> creates GUID partition table
n --> creates new partition (press enter repeatedly to get full disk size)
w --> write to disk
Afterwards format the partition using:
mkfs.exfat /dev/sdi1 
mkfs.ext4 /dev/sdi1 


exfatlabel /dev/sdi1 MY_LABEL 

To make it compatible with macs:
sudo parted /dev/sdX
    set 1 msftdata on 

Note 1 is partition number ^
Generate .htpasswd for NGINX

printf "${username}:`openssl passwd -apr1`\n" >> .htpasswd 

Firefox profile transfer

On new PC:
Need to modify "compatibility.ini" from a new profile to ~/.mozilla/firefox/xxxxxx.default

Go to about:profiles, delete the new profile
Clear Linux Bluetooth Fix

pactl unload-module module-bluetooth-discover 
pactl load-module module-bluetooth-discover