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Server

How to Regain access to AWS EC2 Linux instance when key pair lost?

by SupportPRO Admin April 5, 2023

An associated key pair ( private key and a public key) is necessary to access EC2 instance securely. In case you have lost or corrupted the key pair, here’s how you can regain access to AWS EC2 Linux instance. Let’s assume that the EC2 instance running contains a website but you have lost the key pair that is associated with the EC2 instance. And here we will show the two easiest ways to regain access to AWS Linux EC2 instances. By using an Amazon Machine Image (AMI) By swapping the …

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Technical Articles

Ionice Command: Set I/O Scheduling Class and Priority

by SupportPRO Admin March 20, 2023

written by SupportPRO Admin

The ionice command is used to set I/O scheduling class and priority for a program. The I/O schedule for a program can be changed to the following: CFQ Noop scheduler Anticipatory Deadline The current Disk Scheduler can be viewed from root@twenty ~]# cat /sys/block/sd[ab]/queue/schedulernoop anticipatory deadline [cfq] The current scheduler can be changed by [root@twenty queue]# echo anticipatory > scheduler[root@twenty queue]# cat /sys/block/sda/queue/schedulernoop [anticipatory] deadline cfq Ionice Utility The ionice sets the io scheduling class and priority for a program or script. It supports the following three scheduling classes Idle: …

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Miscellaneous

What Is a Fork Bomb and How Can It Be Prevented?

by SupportPRO Admin February 20, 2023

written by SupportPRO Admin

A fork bomb is a type of denial-of-service attack that can be executed on a computer system. It is a malicious program or script that creates a large number of processes, overwhelming the system and causing it to slow down or crash. The fork bomb works by creating a large number of child processes, which in turn create more child processes, leading to an exponential growth in the number of processes. The code for a fork bomb is often written in bash and executed in the command line. Once activated, …

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Linux

Clear Cache Memory in Linux Without Rebooting

by Noyal S January 16, 2023

written by Noyal S

Clearing cache memory in Linux is a common task that is often necessary to improve system performance or to troubleshoot issues. One way to clear cache memory without having to reboot the system is by using the sysctl command. The sysctl command can be used to configure kernel parameters at runtime, which allows for various system settings to be adjusted without having to reboot the system. To clear the cache memory in Linux, you can use the following command: root@twenty ~]# sync && sudo sysctl -w vm.drop_caches=3 && sudo sysctl …

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Miscellaneous

Access WHM/cPanel Without Root Password

by SupportPRO Admin January 12, 2023

written by SupportPRO Admin

The WHM/cPanel can be accessed without knowing the actual password if it satisfies a single condition i.e you must have shell access to the server. If you have the shell access through SSH Keypair or using VPS nodes on the server, you can simply access the WHM panel without knowing the actual root password of the server. The steps to create a session to access the WHM panel for the root or any reseller accounts without a password is detailed below. whmapi1 is the command which could be executed via …

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server Migration

Imapsync Email Migration: Tool usage and examples

by Bella September 23, 2022

written by Bella

Email Migration is a process used to migrate mailbox content from one account to another. The command imapsync is a tool allowing incremental and recursive IMAP transfer from one mailbox to another.By default all folders are transferred, recursively. We sometimes need to transfer mailboxes from one imap server to another. This is called migration. What is imapsync command? imapsync is a good tool because it reduces the amount of data transferred by not transferring a given message if it is already on both sides. Same headers, same message size and …

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