Category: Fedora / RedHat / CentOS

file access modify creation time will always be in UTC format. In which time offset is +hours or -hours from Longitude: 0° (Prime Meridian) Prime meridian (Greenbich) GPS: 0° 00′ 05.3101″ W Other names: Z / Zulu Time Zone Time […]

update: 2021-1 yum -> dnf hostnamectl; # tested on Virtualization: kvm Operating System: CentOS Linux 8 CPE OS Name: cpe:/o:centos:centos:8 Kernel: Linux 5.4.11 Architecture: x86-64 ll /usr/bin/yum -> dnf-3 all those yum commands still work with dnf (nice work!) DNF […]

there are plenty 😀 debian8.8 [cc lang=”bash” escaped=”true” width=”600″] uname -a; # tested with Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.43-2 (2017-04-30) i686 GNU/Linux find / -type d -iname bin /bin /usr/local/bin /usr/bin /usr/share/doc/libintl-perl/examples/simplecal/bin /usr/lib/klibc/bin [/cc] suse12 [cc lang=”bash” escaped=”true” […]

rpm is a powerful Package Manager for Red Hat, Suse and Fedora Linux. It can be used to build, install, query, verify, update, and remove/erase individual software packages. A Package consists of an archive of files, and package information, including […]

su; # become root yum install kernel-devel # get kernel source # kernel sources will be copied to /usr/src/kernels/3.10.0-514.16.1.el7.x86_64/ # there is a broken softlink in # /usr/src/kernels/3.10.0-514.el7.x86_64 # -> # /usr/src/kernels/3.10.0-514.16.1.el7.x86_64/ # which you will have to fix like […]

yum install epel-release yum groupinstall “X Window system” yum groupinstall “MATE Desktop” # immediately switch over to grafical gui (if possible) systemctl isolate graphical.target; # Tell your systemd to start the graphical.target per default after boot unlink /etc/systemd/system/default.target; ln -s […]

Debian8.7 [cc lang=”bash” escaped=”true” width=”600″] parted GNU Parted 3.2 Using /dev/sda Welcome to GNU Parted! Type ‘help’ to view a list of commands. (parted) p Model: Msft Virtual Disk (scsi) Disk /dev/sda: 136GB Sector size (logical/physical): 512B/512B Partition Table: msdos […]

in general: when changing groups for users the user needs to re-login to activate the changes Public and Private groups CentOS / Red Hat / Debian8 / UBuntu / Raspbian, use a private group scheme where for every new user […]

DEBIAN/UBUNTU [cc lang=”bash” escaped=”true” width=”600″] uname -a; Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) i686 GNU/Linux dpkg -l; # list all installed packages dpkg -l|grep bind; # list all installed packages search for bind ii bind9-host 1:9.9.5.dfsg-9+deb8u10 i386 Version […]

what real value can add linux to mankind? efficiency – less power consumed – less waste – because it runs well on old hardware as well transparency – should actually dissalow tyrannie and dictatorship – because you SHOULD acutally be […]

you can check your machine’s current ip with: ip addr show to modify your network interface address setting simply use the nmtui tool: this failed me once with “no Update2” method… so let’s move on to the… manual way: terminal […]

is not anymore installed per default, and needs to be installed manually. the problem: ifconfig might not be sufficient anymore, because it might for example, not show all ip addresses given to a computer thus it is deprecated the successor […]

While biodiversity is GOOD and efficiency is NOT all we need. Nature looks for a balance of efficiency (30%) and resilience (70%). Standardization is enshuring that your work is compatible with future versions – therefore important for programmers, administrators and […]

it is interesting to see what kernel+filesystem the distributions rely on. Kernels: While CentOS is still on 3.10, Debian is believing in 3.16, and SUSE is “latest” with it’s 4.4 Version kernel. http://www.omgubuntu.co.uk/2015/04/linux-kernel-4-0-new-features https://www.heise.de/newsticker/meldung/Linux-Kernel-macht-Versionssprung-auf-4-0-2557302.html you can upgrade with Debian to […]

exact version used: CentOS-7-x86_64-DVD-1611.iso      

monitor (andoird) devices with bpf: https://www.socallinuxexpo.org/sites/default/files/presentations/bcc-scale.pdf How to monitor system temperature on Linux Last updated on November 7, 2013 Authored by Dan Nanni 10 Comments Creditz: http://xmodulo.com/monitor-system-temperature-linux.html In most cases, you are not supposed to be worried about the temperature […]

you won’t believe it – but your password is NOT required. all you have to do is find “#autologin-user” and put your “autologin-user=username” into it and <- UNCOMMENT autologin-user-timeout=0. reboot. works. uname -a; # tested with Linux debian 3.16.0-4-686-pae #1 […]

cmatrix now also for centos redhat and suse12! 😀 the probably most important linux program in cyberspace…. and neither centos nor suse have it in their repositories. shame! 😀 matrix just changed color 😀 if you wanna feel like a […]

add user in general there is just one binary /usr/sbin/useradd on all three distros. # cross distribution Debian8, RedHat(CentOS7), Suse12 useradd -m username; # add user and create hom directory passwd username; # you will have to asign a password […]

what rkhunter is also doing nicely… it keeps a hash of every file on your system… and if this file changes… you will get noticed. rkhunter (Rootkit Hunter) is a Unix-based tool that scans for rootkits, backdoors and possible local […]

update: 2018.04 PaleMoon archive Server HACKED! “A malicious party gained access to the at the time Windows-based archive server” (src) oh gosh! ? GO USE CENTOS DEBIAN AND LATEST KERNEL NOW! “malware dropper tracked by ESET as Win32/ClipBanker.DY” (steals bitcoins) […]

tested on: Linux Debian 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) i686 GNU/Linux #install software #centos7 yum update && yum install samba-client samba-common cifs-utils #debian apt-get update && apt-get install cifs-utils mkdir /mnt/cifs; # create mountpoint mount -t cifs //FILE-SERVER-IP-ADDRESS/NAME_OF_SHARE /mnt/cifs […]

what service/program is using what port: # list all open ports and listening services/programs lsof -i -P -n; web gui based -> https://dwaves.de/2018/04/04/monitoring-your-network/ watch traffic on terminal -> https://dwaves.de/2017/06/20/linux-bash-terminal-monitor-watch-network-traffic-in-real-time/ resource monitoring -> https://dwaves.de/2017/07/17/debian9-stretch-basic-web-based-ressource-monitoring-with-basic collectd/ nmap returns a nice overview… but […]

less is more (security) in compliance with the UNIX K.I.S.S philosophy run as little software as absolutely necessary stop/uninstall/disable all services not absolutely needed less software = less lines of mistaken code = less security flaws = higher probability those […]

add user to group # official, cross distribution (tested with suse12, centos7, debian8) usermod -a -G GROUPNAME USERNAME # redhat/centos: usermod -a -G wheel user; # add user „user“ to group „wheel“ in order to allow user to use sudo […]

Debian 11 ntp things have changed a bit in Debian 11 (search) ntp is not installed per default anymore hostnamectl; # tested on Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-18-amd64 Architecture: x86-64 # but also on Debian 11 […]