Solving the Mysteries of Geek Code
Create a New User
Open the root user terminal and run the following command:
# adduser username
Add a user to the sudoers file
# usermod -a -G sudo rogerp
Add with visudo
Login as root.
Run
# visudo
Add the user with:
username ALL=(ALL:ALL) ALL
Save file.
Ready to Go!
Run sudo /usr/bin/nvidia-uninstall to uninstall a manually installed driver, if you still got one.
Remove everything of your old NVIDIA driver (simulate first):
sudo apt remove --purge -s nvidia-*
sudo apt remove --purge -s libnvidia-*
If only nvidia packages are there to be removed, remove really:
sudo apt remove --purge nvidia-*
sudo apt remove --purge libnvidia-*
Run sudo apt update and ubuntu-drivers devices again.
If nvidia-390 is still recommended, add your output of sudo ubuntu-drivers autoinstall again.
Great Article: https://www.digitalocean.com/community/tutorials/how-to-install-jitsi-meet-on-ubuntu-18-04
Best Article: https://www.atlantic.net/hipaa-compliant-hosting/how-to-install-openfire-ubuntu-20-04/
The original installation of zpool was from a POPOS 20 install. After Installing a new Ubuntu system over the top of POPOS, the zpool was not listed. Here are the steps to restore the zpool.
Install zfsutils
# apt install zfsutils-linux
When trying to import, I received an error:
# zpool import
pool: myzpool
id: 13464327419314907931
state: ONLINE
status: The pool was last accessed by another system.
action: The pool can be imported using its name or numeric identifier and
the '-f' flag.
see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-EY
config:
myzpool ONLINE
mirror-0 ONLINE
ata-WDC_WD2002FFSX-68PF8N0_WD-WCC6N7PRY8JJ ONLINE
ata-WDC_WD2002FFSX-68PF8N0_WD-WCC6N7PRY1VJ ONLINE
root@skynet:/home/rogerp# zpool import myzpool
cannot import 'myzpool': pool was previously in use from another system.
Last accessed by pop-os (hostid=b5f0b0a0) at Tue May 4 04:27:02 2021
The pool can be imported, use 'zpool import -f' to import the pool.
Import using the -f flag and the pool name that was created originally.
# zpool import -f myzpool
Resources:
https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-EY/
How to mount a NTFS disk in Debian.
Find the disk:
# fdisk -l Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 sectors Disk model: ST3250310AS Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x84c02518 Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 471801855 471799808 225G 83 Linux /dev/sda2 471803902 488396799 16592898 7.9G 5 Extended /dev/sda5 471803904 488396799 16592896 7.9G 82 Linux swap / Solaris Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Disk model: WDC WD10EZRX-00L Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: dos Disk identifier: 0x93665d93 Device Boot Start End Sectors Size Id Type /dev/sdb1 2048 1953521663 1953519616 931.5G 7 HPFS/NTFS/exFAT
So, the NTFS is disk sdb1. Find the UUID value.
sudo blkid /dev/sdb1 /dev/sdb1: LABEL="Backup" UUID="0CF88F39F88F2056" TYPE="ntfs" PTTYPE="atari" PARTUUID="93665d93-01"
Install NTSF-3G:
# sudo apt-get install ntfs-3g
Create the /mnt/ntfs/ directory
# sudo mkdir -p /mnt/ntfs/
Add to fstab.
# nano /etc/fstab # UUID="YOUR-UID-HERE" /mnt/ntfs/ ntfs-3g rw,uid=1000,gid=1000,dmask=0002,fmask=0003 0 0 UUID="0CF88F39F88F2056" /mnt/ntfs/ ntfs-3g rw,uid=1000,gid=1000,dmask=0002,fmask=0003 0 0
Test it
# sudo mount -a
# df -h /dev/sdb1 932G 295G 638G 32% /mnt/ntfs
# cd /mnt/ntfs/ # ls -l
Some great scripts for stress testing and benchmark tests:
https://haydenjames.io/linux-benchmark-scripts-tools/
CentOS
For CentOS, the DIG tool is a part of the BIND Utilities so you need to install them.
# yum whatprovides '*bin/dig'
To install the BIND Utilities, type the following:
# yum install bind-utils
Debian
Update Debian
$ sudo apt update
Install dnsutils package with the following command:
$ sudo apt install dnsutils -y
Check dig
dig -v DiG 9.11.5-P4-5.1+deb10u5-Debian
To find out where disk space is being used:
Get to the root of your machine by running
# cd /
Run
# sudo du -h --max-depth=1
Note which directories are using a lot of disk space.
cd into one of the big directories.
Run
# ls -l
to see which files are using a lot of space. Delete any you don’t need.
Repeat steps to run once you cd into the directory with the largest size
sudo du -h --max-depth=1
This article describes how to change the SSL cert for you Windows server to match a hostname so that when you remote desktop to a windows server, you don’t get a warning for the identity and the SSL cert.
Go to Sectigo (Comodo) and sign up for a free ssl.
https://ssl.comodo.com/free-ssl-certificate.php
First, generate a CSR.
One: https://knowledge.digicert.com/solution/SO21586.html
https://support.comodo.com/index.php?/Knowledgebase/Article/View/739/19/csr-generation-and-ssl-installation-for-ms-terminal-services-rdp
Set up the CSR
Godaddy – https://hk.godaddy.com/en/help/windows-generate-csr-for-code-or-driver-signing-certificate-7282
CSR Generation: Using certreq (Windows)
This article is for administrators who prefer the command shell!
Save the following file as request.inf on your server editing the subject according to the comment:
;----------------- request.inf ----------------- [Version] Signature="$Windows NT$" [NewRequest] Subject = "C=US, CN=something.example.com" KeySpec = 1 KeyLength = 2048 Exportable = TRUE MachineKeySet = TRUE SMIME = False PrivateKeyArchive = FALSE UserProtected = FALSE UseExistingKeySet = FALSE ProviderName = "Microsoft RSA SChannel Cryptographic Provider" ProviderType = 12 RequestType = PKCS10 KeyUsage = 0xa0 HashAlgorithm = SHA256 [EnhancedKeyUsageExtension] OID=1.3.6.1.5.5.7.3.1 ; this is for Server Authentication / Token Signing ;-----------------------------------------------
then run
certreq -new request.inf request.csr
This add the key as well – https://blogs.technet.microsoft.com/rmilne/2014/06/17/how-to-request-certificate-without-using-iis-or-exchange/
re: https://support.comodo.com/index.php?/comodo/Knowledgebase/Article/View/813/102/
Finish install: