Introduction DNS cache can be corrupted for a number of different reasons, including network attacks or viruses. When that happens, IP address mapping becomes corrupted for certain popular websites. For example, instead of going to www.facebook.com, your browser may redirect you to an IP address of a malicious website that an attacker inserted in your computer’s …
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cURL error 60: SSL certificate problem: unable to get local issuer certificate
I have faced this issue in webmin/virtualmin server where Let’s encrypt SSL was installed on the domain and while installing jetpack in WordPress it was giving error. cURL error 60: SSL certificate problem: unable to get local issuer certificate The problem is with SSL of the domain. If you are using let’s encrypt SSL on …
3 Ways to Install Telegram Messenger on Debian 11 bullseye
This tutorial shows 3 ways to install the Telegram messaging app on Debian 11. Telegram is a free, open-source messaging app with a focus on privacy, security and speed. It’s available on Linux, Mac, Window, Android, iOS and Windows Phone. Telegram boasts over 100 million active monthly users. Main features of Telegram Messenger are as follows: Super …
Find Exact Installation Date And Time Of Your Linux OS
On Fedora, RHEL and its clones such as CentOS, Scientific Linux, Oracle Linux, you can find it using the following command: rpm -qi basesystem Sample output [[email protected] ~]# rpm -qi basesystemName : basesystemVersion : 10.0Release : 7.el7.centosArchitecture: noarchInstall Date: Thu 29 Mar 2018 05:05:32 PM ISTGroup : System Environment/BaseSize : 0License : Public DomainSignature : …
HTTP download speed difference in windows vs Linux
HTTP download speed difference in windows 7 vs Linux I have a strange situation regarding a Windows PC which is showing limited internet transfer speeds for no apparent reason. If I am performing the same test on Linux box then I am getting good speed. Upon intense debugging, I am able to diagnose and find out …
How to upgrade ubuntu 16.04 to ubuntu 18.04 ?
How to upgrade ubuntu 16.04 to ubuntu 18.04 ? Check Ubuntu version before upgrading. lsb_release -a First, we have to run an update sudo apt update Then run upgrade command sudo apt upgrade After that dist-upgrade sudo apt dist-upgrade Then update core manager sudo apt install update-manager-core Then edit below file sudo vim /etc/update-manager/release-upgrades At …
command to activate VG on LVM?
Command to activate VG on LVM? When you create a volume group, by default, it is activated. Sometimes you may need to activate it manually to make the kernel aware of volume groups. To activate, # vgchange -ay my_vg_name To De-activate, # vgchnage -an my_vg_name A command to activate the VG in a cluster? To …
How to get mail statistics from your postfix mail logs
How to get mail statistics from your postfix mail logs Its an amazing tool and will provide you the following details Total number of: Messages received, delivered, forwarded, deferred, bounced and rejected Bytes in messages received and delivered Sending and Recipient Hosts/Domains Senders and Recipients Optional SMTPD totals for number of connections, number of …
How to extend disk space in windows 2012
How to extend disk space in windows 2012 Login to windows. Click on Start run and type cmd. In windows command prompt. run diskpart.exe DISKPART prompt will come. diskpart >list volume Above command will show list of volumes. Select volume volume number It will select the volume which you want to extend. extend filesystem It …
dd command to migrate VPS on linux platform
dd command to migrate VPS on linux platform. First create new vps with same configuration on another node. It doesn’t matter new vps is having os or not or you can choose any OS. Once same configuration VPS setup done then use below command to migrate VPS. dd if=/dev/guestos/kvm2351_img | ssh 10.10.10.10 “dd of=/dev/guestos/kvm2520_img” Once migration is …