Dev {Tricks}

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Extract or unzip uploaded ZIP archives Online

Unzipper script can easily extract .zip/.rar/.tar.gz/.gz archives files. Follow the simple easy steps:

  1. Download the Unzipper  php script unzipper.php
  2. Extract it and upload only unzipper.php into the directory where you have zip files.
  3. Browse the unzipper.php
  4. Select the zip file from the input box.

 

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Creating and deleting partitions in Linux

It is a regular practice for server administrators. In most cases, large storage devices are divided into separate sections called partitions.

At first, verify that you have available space on the server for partitions.

fdisk -l

Following command will list all detected hard disks:

fdisk -l | grep '^Disk'

Choose disk or device you want to create or make partition (such as /dev/vda, /dev/vda1, /dev/sda, /dev/sdb etc). Here I will partition the disk /dev/sda (256GB) into /dev/sda1 (100GB) and /dev/sda2 (156GB). Please follow the following steps to create partitions accordingly:

  1. Run 
    fdisk /dev/sda
  2. Type ‘n’ to create a new partition (/dev/sda1)
  3. Select partition type (default p)
  4. Set partition number (default 1)
  5. Set First sector (default 2048)
  6. Set Last sector of the partition: +100G
  7. Type ‘p’ to view the partition.
  8. Then type ‘n’ to create another partition (/dev/sda2)
  9. Select default partition type, default partition number, default First sector and Last sector
  10. Type ‘p’ to view the partition.
  11. Type ‘w” to save the partition.
  12. Run the command ‘partprobe’ to have the OS detect the new partition table. 
    partprobe
  13. Format partitions with the ext4 file system 
    mkfs.ext4 /dev/sda1
mkfs.ext4 /dev/sda2
  14. Create a directory to mount the new drive, for example: /data, /backup [Learn more]
    • Create directory within root 
      mkdir ~/data
    • Create directory within / 
      mkdir -p /backup
  15. To enable persistent mounting of the file system, even after a reboot, add the following to /etc/fstab: 
    /dev/sda1 /mnt/data ext4 defaults 0 0
/dev/sda2 /mnt/backup ext4 defaults 0 0

    fstab [Learn more]

  16. Directory Tree Structure In Linux [Learn more]

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Boost Download and Upload speed in Filezilla

Do you want to speed up filezilla upload and downloads? Follow the steps below:

  1. Open Filezilla FTP client.
  2. Go to File on the top and then click on Site Manager.
  3. Click on New Site. Then go to Transfer Settings tab.
  4. Now select the passive option and type 10 in Maximum number of connections.

This increase connections will speedup download and upload of files.

 

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Understanding DNS records – A, CNAME, ALIAS, URL, MX, CERT, NAPTR, PTR, TXT

A record

Maps a name to IP addresses.

CNAME record

Maps a name to another name. It should only be used when there are no other records on that name.

ALIAS record

Maps a name to another name, but can coexist with other records on that name.

URL record

Redirects the name to the target name using the HTTP 301 status code.

  • The A, CNAME, and ALIAS records cause a name to resolve to an IP. Conversely, the URL record redirects the name to a destination. The URL record is a simple and effective way to apply a redirect for one name to another name, for example redirecting www.example.com to example.com.
  • The A name must resolve to an IP. The CNAME and ALIAS records must point to a name.
  • Never use a CNAME record for your root domain name (e.g. example.com).

MX Record

Mail Exchanger (MX), similar to A name records but entirely devoted to sending and receiving e-mail.

CERT

CERT records store site certificates as part of the DNS information.

NAPTR Records

A rare record type that’s used to map telephone numbers and e-mail addresses for VoIP and SIP servers.

PTR Record

PTR directs IP traffic to domains.

TXT Record

TXT is used commonly to verifying domain ownership. It holds data sender policy framework (SPF) .