https://kb.unixservertech.com/ 2026-05-05T08:12:14+00:00 https://kb.unixservertech.com/ https://kb.unixservertech.com/_media/wiki/dokuwiki.svg text/html 2020-10-06T01:19:17+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/disk_images?rev=1601947157&do=diff Disk Image Quick Reference <https://askubuntu.com/questions/69363/mount-single-partition-from-image-of-entire-disk-device#69447> * get partition offset fdisk -lu image.file * Calculate offset to partition as sector_size*Start losetup -o size_from_above /dev/loop0 image.file e2fsck -f /dev/loop0 mount /dev/loop0 /mnt dd if=/dev/zero of=/mnt/deleteme rm /mnt/deleteme umount /mnt losetup -d /dev/loop0 xz -v image.file text/html 2024-12-07T19:36:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/lvm2?rev=1733600163&do=diff LVM2 Quick Reference Overview LVM (Logical Volume Manager) allows you to take a portion of a block level device and use it as a repository for other block level devices. The most common example of a “block level device” is a hard drive, but it can also include a RAID array, a file, anything that you would normally access as you access the standard hard drive in your home computer. USB thumb drives, etc text/html 2026-04-14T01:50:34+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/mdadm?rev=1776131434&do=diff mdadm Quick Reference Common mdadm commands I found a really great, if somewhat dated, article at . This is mainly a copy of that article, updated for what I do under Debian. Query Array or Member mdadm --examine /dev/sda # get RAID information on sda if it is an array member mdadm --query /dev/md0 # get information on a RAID array, or member if this is a disk mdadm --detail /dev/md0 # gives more information about array, including information about each individual member text/html 2025-03-09T06:01:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/nfs?rev=1741500068&do=diff NFS Quick Reference Some useful commands Finding mounts we can use If you put the server's IP address (or DNS name) below, it will show all NFS mounts available to your machine showmount -e serverip restart nfsd nfs on FreeBSD is very particular in which order you restart the services. In particular, rpcbind text/html 2025-01-05T07:45:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/ssh?rev=1736063106&do=diff ssh Quick Reference This is just some common tricks to use for ssh Passwordless Logins Sometimes, you need to be able to have an automated process log in to a Target machine from a Source machine. In most cases, this is done as the root user. This decreases security somewhat since if your text/html 2024-03-04T22:03:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/ssl?rev=1709589816&do=diff SSL Quick Reference Get Certificate from remote host Ever wondered when your SMTP SSL Certificates are up for renewal? What DNS entries your certificates have? A quick and dirty way of doing it from the command line was shown at * <https://serverfault.com/questions/131627/how-to-inspect-remote-smtp-servers-tls-certificate#131628> * <https://stackoverflow.com/questions/13127352/how-to-check-subject-alternative-names-for-a-ssl-tls-certificate> Note: the discussions covered other things, an… text/html 2018-04-09T00:36:53+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/start?rev=1523234213&do=diff Quick Reference Guides This is a list of Quick Reference Guides I've created. text/html 2025-02-05T06:12:32+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/unix?rev=1738735952&do=diff Unix Quick Reference This is just a location where I store various commands I found handy for Unix. Systems Administration Partitioning large drives Drives greater than 2 Terabytes are not handled well by the standard fdisk application, so instead we use parted. Fun Fact!!! gparted is a nice little text/html 2019-09-25T02:16:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/windows?rev=1569377764&do=diff Windows Quick Reference Read Windows Key from eprom Many manufacturers are shipping systems with no Microsoft key on the case. Instead, the key is stored in ROM. To read the key (from Linux) hexedit /sys/firmware/acpi/tables/MSDM use ^C to exit hexedit. text/html 2025-03-22T04:39:12+00:00 Anonymous (anonymous@undisclosed.example.com) https://kb.unixservertech.com/quickreference/zfs?rev=1742618352&do=diff ZFS Quick Guide The ZFS file system is used widely on BSD, and is coming into more use on Linux. Following are some of my notes on it. Initial Setup (FreeBSD) Start ZFS service FreeBSD comes with the ZFS service installed, but not active. We need to start the service, and also tell the system to start it when the system reboots.