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Quick how to RancherOS and Rancher Waschzettel / blurb RancherOS is a very dockercentric linux OS. 1 boot iso 1 sudo passwd rancher 1 ssh rancher@ 1 ...

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How to start a very simple webserver with buildin tools /usr/bin/python m SimpleHTTPServer 8000

Mac OS X * OSXSecuritY * OSXdmg2Iso * OSXchangeSshPort * OSXCalDAV * OSXBackupOpenDirectory * OSXeToken * OSXGPGKeychainCrash * OSXKeyboar...

Zero Trust Model Instead of traditional methods such as VPNs and login credentials to establish trust and verify identity, Google relies on a “tiered access” mode...

Security Models * castle, perimeter, wall, inside, outside * ZeroTrust, Kerberos, BeyondCorp, perimeter less

Security $ "A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.": Antoine de Saint Ex...

VirtualBoxGuest

Utilities * AwK * sed * HereDocuments * http://code.google.com/p/shellinabox/ * NmaP * RcFiles * fgres a search and replace tool * search a...

Mac OS X Security * Using YubiKey as Smart Card * Smart Card only login * Serveral Login Features

xargs find . name "*.flac" xargs file xargs: unterminated quote find . name "*.flac" print0 xargs 0 file The print0 argument tells find to use the NULL c...

tcpdump tcpdump filter to match DHCP packets including a specific Client MAC Address: tcpdump i eth3 vvv s 1500 '((port 67 or port 68) and (udp 38:4 = 0x00cac...

Copyright This sysadmin.wiki by the contributing authors is licensed under a Creative Commons Attribution 4.0 Unported License.Permissions beyond the scope of thi...

No active remote repositories configured * https://stackoverflow.com/questions/40080493/no active remote repositories configured

Sysadmin FreeBSD * FreeBSDAfterboot * FreeBSDexpl * SerialWithPcenginesAPU * jails * BootEnvironmentsOnFreeBSD * StaticLinkedPackages * Follo...

PXE Install FreeBSD on Soekris net5501 dhcp tftp nfs freebsd files from source cd /usr/src make buildworld BOOT_PXELDR_ALWAYS_SERIAL=1 BOOT_COMCONSOLE_SPEED=...

Remove the schg flag Use chflags(1) to remove the schg flag. Some files of the base OS are protected by this flag. chflags R noschg /usr/bin

Wireless LAN (WLAN) Grundlagen zu Wireless LAN, Standards, Sicherheit, Technik, FAQ sowie alle Chipsätze und deren Treiber. Neben der Geschichte, Tips und HowTos...

GPIO on a Banana Pi M1 with FreeBSD $ Is there any GPIO on the hardware: dmesg grep gpio $ List available GPIO pins: gpioctl lv or gpioctl f /dev/gpioc1...

use GPIO with FReeBSD * BananaPiM1

ntpd build options working build options for BeagleBone Black with Linux beaglebone 3.8.13 bone70 ./configure ' prefix=/opt/ntp' ' enable all clocks' ' enable ...

Raspberry with a gps clock and a etc RTC * apt get install i2c tools * cat /etc/modules pps gpio * modprobe i2c bcm2708 * modprobe rtc ds1307 ...

Antenna cables * GPSANT https://www.meinberg.de/german/products/gps antenne konverter.htm * handelsüblichem Koaxialkabel (z.B. RG58) = 300m * Koaxi...

Timeserver with ntp WORK IN PROGRESS * EnterpriseTimeServer * EasyDistributeAndBalanceWithPool * NtpLeapsecondFile * NtpVsPtp * MeinbergNtpConfig ...

Network Services * DhcpD * BinD9 * ProXy * NodeJs * IpAM IP Address Management or DDI if you integrate IpAM with DhcpD and BinD9 * NtP

GPS head for raspberry pi form Florian Täger Kurz noch ein paar Hilfreiche Details: Das PPS Signal liegt an GPIO 23 an. Auf GPIO 24 liegt das FIX Signal. LED1 hä...

Format a USB stick with ufs * gpart show * gpart destroy F da0 * gpart create s gpt da0 * gpart add t freebsd ufs da0 * newfs /dev/da0p1 * mo...

reset password boot dka100.1.0.6.1 flags 0,1 System will be reset prior to boot. OpenVMS PALcode V1.88 27, Digital UNIX PALcode V1.83 22 FF.FE.FD.FC.FB.FA.F9....

OpenVMS * ResetPassword

FritzFon C5 and SpeedPort Hybrid Anmeldung an Basis 1, 2, 3 oder 4 gescheitert Registration to SpeedPort failed. * Login Menü Telefonie DECT Basisstation...

Fritzbox * Enable telnet * FritzFon C5 mit SpeedPort Hybrid Anmeldung an Basis 1, 2, 3 oder 4 gescheitert

Was muss man beim Aufbau eines Wireless LAN beachten? Generell ist es so, daß man ein FunkLAN testen muss theoretisch berechnen lässtsich eine Funkzelle kaum. A...

jekyll A static website generator. Create a new projekt jekyll new projektname Replace default template (minima) with your own template rm about.md index.md and...

Mac OS X Gatekeeper security sudo spctl master disable sudo spctl master enable sudo xattr rd com.apple.quarantine /Applications/LockedApp.app

How to put a FreeBSD laptop into sleepmode, suspend as root acpiconf s 3

Follow the quarterly or latest packages In file /etc/pkg/FreeBSD.conf use url: "pkg http://pkg.FreeBSD.org/${ABI}/latest", or url: "pkg http://pkg.FreeBSD.org...

FreeBSD Afterboot sshd.conf within bsdinstall shell! ssh ssh port allow root Some common best practice files create ~/CHANGES # logfile for every major...

List of IP Address Management tools (IPAM) and DNS DHCP IPAM (DDI) List of IPAM at Wikipedia commercial * QIP * Infoblox http://www.infoblox.de/de/product...

X11 / xorg on FreeBSD * GermanKeyboard * SequenceToKillTheXserver * CorrectResolutioninVirtualBox * https://forums.freebsd.org/threads/various progra...

sequence to kill the X server Terminating Xorg with Ctrl Alt Backspace cat /usr/local/etc/X11/xorg.conf.d/keyboard zap.conf

German keyboard on Xorg cat /usr/local/etc/X11/xorg.conf.d/keyboard de.conf in my case FreeBSD as guest in VirtualBox on a Lenovo Thinkpad T460s

add user via batchfile adduser f user.list G wheel w no piest:2001:::::Stephan :: engk:2002:::::Engel:: grea:2003:::::Andreas:: tihar:2004:::::Tim:: seej:2005:...

!/bin/sh #export http_proxy=http://10.133.65.201:3128/ #export HTTP_PROXY=http://10.133.65.201:3128/ NTPBINURL=http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp 4...

Ubuntu bind is compiled with built with ' prefix=/usr' ' mandir=/usr/share/man' ' infodir=/usr/share/info' ' sysconfdir=/etc/bind' ' localstatedir=/var' ' enable ...

ISC bind 9 * LogginG * CachingOnly (proxy i.e. forwarder) * DetectDomainGenerationAlgorithm * InternalRootServer * QueryBindVersion * DNSControl...

# bind soll konfig neu laden rndc reload # virtuelle Fenster aufmachen screen CTRL A A zusaetzliches Fenster aufmachen CTRL A SPACE zwischen den Fenstern wechseln...

Unsorted examples * UbuntuExpl

Miscellaneous * ResetProximAP4000 How to reset an old access point * Fun A bit more complex 'hello world' in EVERY programming language you never heard of ...

Headline What is the best way to remove all packages and start over? 1 Update the ports tree. 2 Run pkg_delete pkg_delete a 3 Back up /usr/local/etc/ ...

How can i prevent the scrollbar to jump to the clicked location? 1 Edit configuration about:config 2 add ui.scrollToClick=0 * https://support.mozilla.org...

Review the post install message Sometimes you miss something in the post install message, after installing a package. pkg install cde Review the post install mess...

Correct resolution in VirtualBox I have to set the correct resolution in the config. I was fixed to a 640x480 resolution. With xrandr i can view the possible reso...

FreeBSD as VirtualBox guest 1 pkg install virtualbox ose additions 1 add this to /etc/rc.conf vboxguest_enable="YES" vboxservice_enable="YES"

How to keep your packages up to date * cvs d $CVSROOT checkout r pkgsrc 2019Q1 P pkgsrc * pkg_chk u k * pkg_rolling replace rsuvX bmake,bootstrap ...

continuous grep How to grep continuously in a logfile tail f file grep line buffered pattern

How to access packages or updates through a proxy setenv HTTP_PROXY http://10.130.65.2:3128/ setenv HTTPS_PROXY https://10.130.65.2:3128/ cvs q z2 " d:pserver;p...

Static linked packages ad this to the port's Makefile MAKE_ARGS = STATIC=1

FreeBSD example commands Work in Progress tmux virtual terminal similar to screen tmux ctrl b d tmux a ctrl b c ctrl b n https://tmuxcheatsheet.com Temperatur...

ntp example config # # $FreeBSD: stable/12/usr.sbin/ntp/ntpd/ntp.conf 337649 2018 08 11 17:42:42Z brd $ # # Default NTP servers for the FreeBSD operating system. ...

# Example /opt/pkg/etc/mk.conf file produced by bootstrap pkgsrc # Donnerstag, 16. Januar 2014, 22:08:52 Uhr CET .ifdef BSD_PKG_MK # begin pkgsrc settings P...

ssh and ~/.ssh/config Work in progress * http://www.cyberciti.biz/faq/create ssh config file on linux unix/ * fefe about ssh * ssh best practice

How to setup Mac OS X Terminal * Make sure you choose xterm not vt100 in Profiles Advanced Terminfo display colors * Disable Allow Mouse Reporting in Me...

99 Bottles of Beer $ This Website holds a collection of the Song 99 Bottles of Beer programmed in 1500 different programming languages: http://www.99 bottles o...

Howto reset a Proxim AccessPoint 4000 Orinico 1 Switch on 2 push reset for 13 seconds (not too much longer) 3 If you have a DHCP Server the AP will fetch...

Oracle Solaris 10 * AfterbootSolaris * SolarisAtStrato * EncryptFiles * SolarisBlogroll * ChangeHostnameOrIP * SolarisAuthViaTacacs * UpdateW...

multitail The program multitail lets you view one or multiple files like the original tail program. multitail ci green httpd access.log ci yellow I httpd...

Reichweiten mit Wireless LAN Die Reichweite hängt stark von den Räumlichkeiten, den Antennen und der Sendeleistung ab. Grundsätzlich breiten sich im verwendeten F...

Powerline Communication (PLC) Powerline kann eine sinnvolle Alternative zu WirelessLAN sein, wenn man zwei oder mehr Rechner quer durch ein Haus verbinden will. P...

Cisco Firewall * ASDM: Unconnected sockets not implemented * ASAInitialSetup * ASAFactoryConfig * FirewallBestPractice * ASAConfigExamples * Asa...

MySQL or MariaDB * ExampleMyCnf * InitialSetupForWordpress * MoreSecureSetup

http://sysadmin.wiki/Work/WebTopicList http://sysadmin.wiki/Sysadmin/WebTopicList http://sysadmin.wiki/Main/WebTopicList http://sysadmin.wiki/Sysadmin/ASA5520Boot...

how to secure ntpd In the ntp.conf restrict default limited kod nomodify notrap nopeer restrict 6 default limited kod nomodify notrap nopeer restrict 127.0.0.1 r...

GPS Time Signal Trimble SVeeSix CM3 This auction is for a Trimble SVeeSix CM 3 OEM Embedded (Core Module) GPS Receiver and miniature OEM antenna. It is guarantee...

Example config for Meinberg Clocks ETXMGX/SHS BGT V4.59 # * lantime * # NTP.CONF for GPS167 with UNI ERLANGEN (do not modify) server 127.0.0.1 minpoll 4 max...

The Kiss of Death Packet Ordinarily, packets denied service are simply dropped with no further action except incrementing statistics counters. Sometimes a more pr...

BeagleBone Black * BBBwithAdafruitGPS with ntpd and PPS

Wishlist for the Sysadmin.WebHome Wiki * lot more nice pictures * nice view with CSS for mobile devices * search field in the upper right

More restrictive setup for MySQL Create user CREATE USER 'username'@'localhost' IDENTIFIED BY ' 8hsdg'; Create database with utf 8 CREATE DATABASE dbname CHARACTE...

Initial setup for wordpress Login mysql u root p Create database create database wp_example_com; Create user CREATE USER 'wp_user'@'localhost' IDENTIFIED BY 'se...

Minimal MySQL config Example MySQL or MariaDB configuration file (my.cnf) for FreeBSD ## SERVER ## mysqld datadir = /var/db/mysql sock...

Difference between ntp and ptp * https://www.eecis.udel.edu/~mills/ptp.html * http://www.fsmlabs.com/news/2012/06/28/choosing between ptp and ntp.html * ...

ntp DO NOT EDIT THIS FILE IS FOR HISTORIC REVIEW * EnterpriseTimeServer * EasyDistributeAndBalanceWithPool Difference between ntp and ptp * https://ww...

The NIST leapsecond file The file is available available at ftp://time.nist.gov/pub/ as well as ftp://tycho.usno.navy.mil/pub/ntp/

How to easily configure and balance several ntp server with the pool directive Use one pool directive in your ntp.conf and you are ready. pool 0.DE.pool.ntp.org i...

Anfänge des Wireless LAN Die aus Österreich stammende Schauspielerin Hedy Lamarr und der Musiker George Antheil erfanden 'Frequency Hopping' und erhielten dafür 1...

I had Problems to connect my smtp Server I got the error message Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" I have a Telecom Connection with a...

How to print single quote in awk awk '{print "\x27" $1 "\x27"}'

awk, gawk Helpful examples for awk. work in progress cat MAC_Vendor_List grep "(hex)" sed 's/\//\\/g' awk '{sub(" ",":",$1);sub(" ",":",$1); printf "s/"tolow...

List all services in systemd systemctl list unit files t service

Redhat * HowToViewLastlog * ListAllSystemdServices

How to view lastlog Just type lastlog Don't be confused /var/log/lastlog is a sparse file, which seems to be bigger than is actually is. # ls lh lastlog rw r r ...

Linux * DebianShowInstalledPackage * PolicyBasedRouting * RedHat

Installation packages needed in pkgsrc How to install a usable latex with pkgsrc Install: * print/xetex * print/tex koma script * print/tex babel * p...

Enterprise Time Server In a datacenter you need a reliable exact time source. Normally you habe one or several ntp server (ntpd) dirctly connected to a time norma...

BeagleBoneBlack with Adafruit Ultimate GPS Breakout WORKINPROGRESS I like to run a SoC with a GPS and PPS as a primary source for ntpd. I choose BeagleBone Black ...

nmap Examples * nmap p80 Pn iL liste1.txt oG awk '/open/{print $2 " " $3}' * nmap p80 10.167.1.0/24 oG grep open * cat gscan.10.130.0.0 1...

Enterprise Wireless LAN WLAN Controller * CiscoWLC BAUSTELLE Einsatz im Enterprise Bereich HotSpots (One Button Hotspots, Coffee Shops, Flughafen, public Are...

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Best Practices in Server Administration WORK IN PROGRESS Keep it small simple 1 keep some basic information in a README file on the machine 1 keep last c...