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How to Resize a Partition using fdisk

Prerequisites

  • Existing partition that you know the name. To check the name, run cat /etc/fstab.
  • The partition you want to resize have to be the last partition on a particular disk.
  • Note that the partition not in use.

Warning

All data will be erased on the partition.

Procedure

Suppose we are re-partitioning /dev/vdb1

  1. Remove the partition from fstab 
    vi /etc/fstab
  2. Unmount the partition 
    umount /dev/vdb1
  3. Run 
    fdisk /dev/vdb1

    Welcome to fdisk (util-linux 2.23.2).

    Changes will remain in memory only, until you decide to write them. Be careful before using the write command.

    Command (m for help):

 

 

 

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8 common errors that you may have after installing CSF Firewall on Linux CentOS server

  1. *WARNING* Binary location for [CHATTR] [/usr/bin/chattr] in /etc/csf/csf.conf is either incorrect, is not installed or is not executableTo solve this problem, we need to install Ext2 Filesystem Utilities package. Run the following command to install the E2fsprogs package. 
    yum install e2fsprogs
  2. Oops Unable to download Protocol scheme ‘https’ is not supported (IOSocketSSL not installed)If CSF failed to update, then this error occurs. To fix this issue run 
    yum install perl-Crypt-SSLeay perl-Net-SSLeay

    Then try updating CSF.

    csf -u
  3. Oops Unable to download Protocol scheme ‘https’ is not supported (LWPProtocolhttps not installed)
  4. Testing ip_tablesiptable_filter…open3 exec of sbiniptables -I OUTPUT -p tcp –dport 9999 -j ACCEPT failed at usrlocalcsfbincsftest.pl line 144.
  5. *WARNING* Binary location for [SENDMAIL] [/usr/sbin/sendmail] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable*
    WARNING* Missing or incorrect binary locations will break csf and lfd functionality
  6. *WARNING* Binary location for [UNZIP] [usrbinunzip] in etccsfcsf.conf is either incorrect, is not installed or is not executable
  7. *WARNING* URLGET set to use LWP but perl module is not installed, reverting to HTTP::Tiny
  8. *WARNING* Binary location for [HOST] [usrbinhost] in etccsfcsf.conf is either incorrect, is not installed or is not executable

 

 

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Create SSH Keys with PuTTY on Windows

Download and install PuTTY on your computer.

After installing putty, run PuTTYgen from start menu

You may customize Parameter at the bottom. But generally default values are appropriate.

Now click on Generate and move the mouse on blank area to complete key generation.

Save private key in save place. Noted that you may or may not use Key passphrase.

Close PuTTYgen tools.

Connect to server with Private Key

Open PuTTY

Put hostname or IP in session.

Go to Connection > SSH > Auth and browse private key.

Now you will be prompted Login as

 

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Email Protocols – POP3, IMAP and SMTP and mail settings

  • POP3: Post Office Protocol version 3 (POP3)
  • IMAP: Internet Message Access Protocol (IMAP)
  • SMTP: Simple Mail Transfer Protocol (SMTP)

Incoming mail server (POP3 or IMAP):

mail.domain.com

Server hostname can also be used as mail server. For example, server.bdhostit.com

IMAP Settings:

  • IMAP port: 143 (IMAP non-encrypted port)
  • IMAP port: 993 (IMAP encrypted port support SSL)

Server requires encrypted connection (SSL). (Apple Mail users should tick “Use SSL”)

POP3 Settings:

  • POP3 port: 110 (POP3 non-encrypted port)
  • POP3 port: 995 (POP3 encrypted port support SSL)

Server requires encrypted connection (SSL). (Apple Mail users should tick “Use SSL”)

Username: EMAIL ADDRESS
Password: EMAIL PASSWORD

Outgoing mail server (SMTP):

mail.domain.com

Server hostname can also be used as mail server. For example, server.bdhostit.com

SMTP Settings

  • SMTP Port = 25 (SMTP non-encrypted port)
  • SMTP Port = 465 (SMTP encrypted port support SSL)
  • SMTP Port = 587 (SMTP encrypted port support SSL)

Username: EMAIL ADDRESS
Password: EMAIL PASSWORD