Category: Administration / Server

09.08.2018

i want to create a autostart script that starts whenever the server starts. mkdir /scripts vim /scripts/start.sh #!/bin/bash echo „========= starting up docker service“ systemctl start docker echo „========= starting up docker containers“ docker start containername vim /scripts/stop.sh #!/bin/bash echo […]

DSGVO Datenschutz Impressum Generator – Der Bürokratie-Datenschutz-Horror
24.05.2018

Update: Rechtsverdreher aus Augsburg mahnt Firseur in Hamburg ab: https://www.heise.de/tp/features/DSGVO-Anwaltskanzlei-mahnt-Friseure-ab-4089547.html Streitwert in Höhe von 7.500 Euro 729,23 Euro Abmahngebühr. English: Develop alternatives to IPhones/WhatsApp/Facebook, using Linux, implementing End-to-End-Encrypted Mails with sender verification would be WAY MORE EFFECTIVE in terms of […]

Sun Fire UltraSparc T1000 RISC Server Overview
21.05.2018

want to buy one? check ebay: for „sun“ and „sparc“ https://www.ebay.de/itm/Sun-SPARC-Enterprise-T5220-4-Core-1-2-GHz-64GB-RAM-DVD-Server-Ultrasparc-II/153009384825 recipe: what you will need: a T1000 alternatively: ear sealing headphones + music. a LAN switch with DHCP-server/router attached LAN cables (atleast 4x (1x DHCP-server, 1x workstation/client, 1x server […]

Monitoring your Network
04.04.2018

so i guess „monitoring“ is about two things: availability and performance: detect performance bottlenecks get informed if parts (harddisks) / servers have failed / are about to fail security: detect, report and (if possible) automatically fence off „unusual“ network activity […]

how to verify Debian ISO Image – BAD signature – how to sign a file – chain of trust – the problem with short key IDs
17.03.2018

make sure you downloaded the SHA512SUMS.sign from the same directory as the iso. https://keyring.debian.org/ https://www.debian.org/CD/verify https://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/9.4.0+nonfree/amd64/iso-cd/ https://bits.debian.org/2016/08/debian-and-tor-services-available-as-onion-services.html otherwise you will get BAD signature. steps to reproduce: # download the iso image with non-free drivers (yes it sucks non-free drivers are […]

NGINX as HTTP proxy – vhosts and SSL for Tomcat
01.03.2018

Secure Socket Layer (SSL) is a protocol that provides security for communications between client and server by implementing encrypted data and certificate-based authentication. Technically, the term „SSL“ now refers to the Transport Layer Security (TLS) protocol, which is based on […]

apt yum exclude package from update upgrade
01.03.2018

maybe you want to run your own version of the kernel and you will have to prevent during an automatic update that this kernel will get „replaced“. same goes with firefox, thunderbird and LibreOffice yum and apt might not install […]

27.02.2018

in a script you can specify to save output to a file with current date/time like: LOGFILE=/path/to/logfiles/$(date ‚+%Y-%m-%d‘)_task.log echo „this script was run“ >> $LOGFILE; to cleanup regularly is important in order to ensure the harddisk does not fill up. […]

NMAP basic network scanning – overview over LAN
27.02.2018

What computers are online? What services/ports in what versions are online/open? over poorly or not so poorly documented LANs you can get an overview by using nmap. yum install nmap; # centos/redhat apt-get install nmap; # debian/ubuntu # get a […]

CENTOS7 – vnc server remote desktop setup howto screen sharing in 2018 – x11vnc error: socket: Address family not supported by protocol (97)
20.02.2018

UPDATED! checkout vnc section of: https://dwaves.org/2018/05/07/getting-started-with-raspberry-pi-2-model-b-v1-1-vs-odroid-xu4-vnc-display-0-and-1/ UPDATED AGAIN! if you have problems connecting and get the error message: „x11vnc error: socket: Address family not supported by protocol (97)“ then you probably have ipv6 disabled on the client. (and even if […]

CentOS7 setup virtualbox
07.02.2018

1. https://dwaves.org/2017/06/30/centos-redhat-compiling-the-latest-kernel/ 2. checkout what is the latest version of VirtualBox for your System: https://www.virtualbox.org/wiki/Downloads su; # become root mkdir /software; cd /software; wget https://download.virtualbox.org/virtualbox/5.2.6/VirtualBox-5.2-5.2.6_120293_el7-1.x86_64.rpm rpm -i VirtualBox-5.2-5.2.6_120293_el7-1.x86_64.rpm; # install usermod -a -G vboxusers YourDefaultNonRootUser; # add DefaultNonRootUser to group […]

Docker
29.01.2018

who is who? concepts: docker is written in Google Go by Docker Inc, SanFrancisco because it does not emulate any hardware – it is a linux container / sandbox or jail like Free BSD Jail or Solaris Zones. For example […]

12.01.2018

When you reserve a new domain – and the registrar asks you for your (personal?) mail to be published in the whois database. You better give it a mail address designated for spam. I just received a spam letter at […]