Clik here to view.
Send TCP / UDP strings and commands to Local and Remote Applications without...
Did you ever needed to send TCP / UDP packets manually to send commands to local or remote applications, having a fully functional BASH Shell but not having the luxury to have NC (Netcat Swiss Army...
View ArticleClik here to view.
How to install GUI on CentOS 7 Minimal and set Gnome Graphical Environment to...
I have installed CentOS 7.7 Minimal Server Linux on a VirtualBox Virtual Environment as a test bed machine. The system got installed easily succesfully with the standard CentOS python based graphical...
View ArticleClik here to view.
Get daily E-Mail Reports statistics on postfix Linux mail server
I've had today a task at work to monitor a postfix mail send and received emails (MAIL FROM / RPCT TO) and get out a simple statistics on what kind of emails are coming and going out from the Postfix...
View ArticleClik here to view.
How to check how many processor and volume groups IBM AIX eServer have
In daily sysadmin duties I have been usually administrating GNU / Linux or FreeBSD servers. However now in my daily sysadmin jobs I've been added to do some minor sysadmin activities on a few IBM AIX...
View ArticleClik here to view.
Linux Send Monitoring Alert Emails without Mail Server via relay SMTP with...
If you have to setup a new Linux server where you need to do a certain local running daemons monitoring with a custom scripts on the local machine Nagios / Zabbix / Graphana etc. that should notify...
View ArticleClik here to view.
Stop SSH Bruteforce authentication attempt Attacks with fail2ban
Most of webmasters today have some kind of SSH console remote access to the server and the OpenSSH Secure Shell service is usually not filtered for specific Networks but fully accessbible on the...
View ArticleClik here to view.
Linux: Howto Disable logging for all VirtualHosts on Apache and NGINX...
Did you happen to administer Apache Webservers or NGINX webservers whose logs start to grow so rapidly that are flooding the disk too quickly? Well this happens sometimes and it also happens that...
View ArticleClik here to view.
June 29 the Feast of The Glorious and First among Apostles Peter and Paul in...
Saint Apostle Peter and Paul are the most glorious of all Christ desciples thanks to whom by God's mercy and Grace the nations have received the good news of the Lord Jesus's Christ Crucifix for the...
View ArticleClik here to view.
Make Laptop Sleep on LID (Monitor) close in Linux Debian and Ubuntu systemd...
I need to make my laptop automatically sleep on LID Screen close but it doesn't why? If have used your laptop for long years with Windows or any Windows user is used to the default beavrior of Windows...
View ArticleClik here to view.
Sysadmin tip: How to force a new Linux user account password change after...
Have you logged in through SSH to remote servers with the brand new given UNIX account in your company just to be prompted for your current Password immediately after logging and forced to change your...
View ArticleClik here to view.
Improve SSL security: Generate and add Diffie Hellman key to SSL certificate...
Diffie–Hellman key exchange (DH) is a method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after...
View ArticleClik here to view.
Fix eth changing network interface names from new Linux naming scheme ens,...
On CentOS / RHEL 7 / Fedora 19+ and other Linux distributions, the default network eth0, eth1 .. interface naming scheme has been changed and in newer Linux kernels OS-es to names such as – ens3 ,...
View ArticleClik here to view.
How to debug failing service in systemctl and add a new IP network alias in...
If you get some error with some service that is start / stopped via systemctl you might be pondering how to debug further why the service is not up then then you'll be in the situation I was today....
View ArticleClik here to view.
How to install jcmd on CentOS 7 to diagnose running Java Virtual Machine...
jcmd utility is well known in the Brane New wonderful world of Java but if you're like me a classical old school sysadmins and non-java developer you probably never heard it hence before going...
View ArticleClik here to view.
Linux show largest sized packages / Which Deb, RPM Linux installed package...
A very common problem that happens on both Linux installed servers and Desktop Linux is a starting to fill / (root partition). This problem could happen due to several reasons just to point few of...
View ArticleClik here to view.
Check when Windows Active Directory user expires and set user password expire...
If you're working for a company that is following high security / PCI Security Standards and you're using m$ Windows OS that belongs to the domain it is useful to know when your user is set to expiry...
View ArticleClik here to view.
ipmitool: Reset and manage IPMI (Intelligent Platform Management Interface) /...
As a system administration nomatter whether you manage a bunch of server in a own brew and run Data Center location with some Rack mounted Hardware like PowerEdge M600 / ProLiant DL360e G8 / ProLiant...
View ArticleClik here to view.
How to do Diff (compare files) over SSH between local and remote servers on...
In system administration often we need to compare files located on a different servers, copying the files from Server A to Server B is easy to do but is time consuming as you have use some console ftp...
View ArticleClik here to view.
How to clear ARP cache on Linux / Windows for a single IP address / Flush All...
On times of Public Internet IP migration or Local IPs between Linux servers or especially in clustered Linux Application Services running on environments like Pacemaker / Corosync / Heartbeat with...
View ArticleClik here to view.
Rsync copy files with root privileges between servers with root superuser...
Sometimes on servers that follow high security standards in companies following PCI Security (Payment Card Data Security) standards it is necessery to have a very weird configurations on servers,to...
View Article![BLACKPINK – DEADLINE – EP [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Video211/v4/de/b3/b1/deb3b1d4-ba28-22e8-2428-ef97617b2a4b/90d54d743002a6d66308f217cd867947_Preview_Image_Intermediate_nonvideo_sdr_426725135_2574858051.png/316x316bb.webp)
