Basic System Commands Server Basic Info Boot & Kernel Software Installation Server Services User operations Volumes, File systems, Storage Networking & routing Security management Process management
Author: Albert
NFS server configuration file in AlmaLinux 8, CentOS 8
The new configuration file for NFS server setup in AlmaLinux 8 is /etc/nfs.conf. /etc/sysconfig/nfs is deprecated and replaced by /etc/nfs.conf. # cat /etc/nfs.conf## This is a general configuration for the# NFS daemons and tools#[general]# pipefs-directory=/var/lib/nfs/rpc_pipefs#[exportfs]# debug=0#[gssd]# use-memcache=0# use-machine-creds=1use-gss-proxy = yes# avoid-dns=1# limit-to-legacy-enctypes=0# context-timeout=0# rpc-timeout=5# keytab-file=/etc/krb5.keytab# cred-cache-directory=# preferred-realm=#[lockd]# port=0# udp-port=0#[mountd]# debug=0# manage_gids=n# descriptors=0# port=0# threads=1# reverse-lookup=n# …
How to setup password-less SSH between Windows Clients and CentOS, AlmaLinux servers
Method 1: Create pub/private keys on Windows Clients and copy the public key to Linux Server On a Windows machine, open Putty Key Generator. Click Generate to create public and private keys (set passphrase if preferred). Copy the content of the public key, and paste it to the ~/.ssh/authorized_keys file on AlmaLinux/CentOS ssh server. Confirm …
How to set default Java version with alternatives tool in AlmaLinux
When different Java versions are installed on a Linux server, use the alternatives tool to set the default Java version as follows: alternatives --config java There are 2 program that provides 'java'. Selection Command ----------------------------------------------- *+ 1 java-1.9.0-openjdk.x86_64 (/usr/lib/jvm/java-1.9.0-openjdk-1.9.0.292.b10-1.el8_4.x86_64/jre/bin/java) 2 java-12-openjdk.x86_64 (/usr/lib/jvm/java-12-openjdk-11.0.11.0.9-2.el8_4.x86_64/bin/java) Enter to keep the current selection[+], or type selection number: 2 Type 1 …
Unable to connect via SSH to other hosts in VMware running AlmaLinux 8 VM
If you SSH to other hosts in VM running under VMware workstation, you may get the following error: packet_write_wait: Connection to x.x.x.x port 22: Broken pipe To resolve this issue use bridged networking instead of NAT in VMware workstation. If you still want to keep NAT networking, add the following to your ~/.ssh/config file: Host …
Drop in GPU usage for GPU intensive application
To resolve this issue, replace DPMS with HardDPMS in the “OutputClass” section of Xorg configuration file [/etc/X11/xorg.conf.d/] as shown below: option "DPMS" "false" Change above to: Option "HardDPMS" "flase" If no DPMS options are set in [/etc/X11/xorg.conf.d/] file than append this option as follows: Section "OutputClass"Identifier "nvidia"MatchDriver "nvidia-drm"Driver "nvidia"Option "AllowEmptyInitialConfiguration"Option "PrimaryGPU" "yes"Option "SLI" "Auto"Option "BaseMosaic" …
GPU devices have wrong SELinux context after reboot server in CentOS and AlmaLinux
GPU devices show the wrong SELinux context after the server restarts and cannot be used without restoring the context with restorecon. ls -Z /dev/nvi*crw-rw-rw-. root root system_u:object_r:xserver_misc_device_t:s0 /dev/nvidia0crw-rw-rw-. root root system_u:object_r:xserver_misc_device_t:s0 /dev/nvidia1crw-rw-rw-. root root system_u:object_r:device_t:s0 /dev/nvidia2crw-rw-rw-. root root system_u:object_r:device_t:s0 /dev/nvidia3crw-rw-rw-. root root system_u:object_r:device_t:s0 /dev/nvidia4crw-rw-rw-. root root system_u:object_r:device_t:s0 /dev/nvidia5crw-rw-rw-. root root system_u:object_r:device_t:s0 /dev/nvidia6crw-rw-rw-. root root system_u:object_r:device_t:s0 …
External GPU support in CentOS 7
Extrenal GPU can be attached to CentOS 7 system using Thunderbolt. You may require drivers or additional hardware for a particle GPU card or thunderbolt slot.
GPU in VMware hypervisor does not work with PCI passthrough
It is not possible that GPU in your host server will work with the PCI passthrough. Virtual machines will be unable to use hypervisor GPU configured for PCI passthrough. For GPU to work with PCI passthrough, it should be explicitly designed for this purpose, such as AMD MxGPU or NVIDIA Grid devices. The main reason …
What ASPEED GPUs are supported in AlmaLinux 8 and CentOS 8
Following ASPEED GPUs are supported in AlmaLinux 8 based servers. AST2000 AST2100 AST2150 AST2200 AST2300 AST2400 AST2500
How to install the NVIDIA proprietary driver on AlmaLinux and CentOS
Download the latest GPU driver from the NVIDIA driver download page. Make the driver file that you have just downloaded executable by entering the following command. chmod +x /root/NVIDIA-${version}.sh Disable the nouveau module; echo 'blacklist nouveau' >> /etc/modprobe.d/blacklist.conf Install dependencies by replacing the server with GUI to the workstation. dnf groupinstall "Server with GUI" "base-x" …
How to install Nvidia CUDA on AlmaLinux 8 and CentOS
Remove the currently installed driver from your AlmaLinux server if installed using CUDA toolkit runfile. /usr/local/cuda-X.Y/bin/cuda-uninstall If you have used the NVIDIA driver runfile for installation, use the following command for uninstallation. /usr/bin/nvidia-uninstall Add EPEL repository, dnf install epel-release Run the update command to let the system rebuild the repository cache. After updating, you will …
How to restart network in AlmaLinux and CentOS 8
You can restart the network in AlmaLinux 8 by using two methods. The preferred one using nmcli is given below. nmcli networking off && nmcli networking on The second method is to install legacy network services as below. yum install network-scriptsservice network restart Using the second method, you will get the following warning messages in …
How to unmount Network file Server (NFS) mount quickly when the NFS server is offline
The recommended solution is to use soft, timeo (deciseconds), and retrans options. soft option for mount command should be used if client responsiveness is favored over data integrity. Suppose applications utilizing NFS data can handle the IO error produced by soft mount, than it is ok to use. Other options like timeo and retrans options …
How Nullify a log file in Linux
At this point, you already have the file which is causing the problem and you want to nullify it so just do as; #cat <logfile.Name> | gzip -v9 > (logfile).(date-time) # cat lastlog | gzip -v9 > lastlog.300721-0648 #cat /dev/null > lastlog or # cp /var/adm/syslog/syslog.log /var/adm/syslog/syslog.log.bak # gzip /var/adm/syslog/syslog.log.bak # cp /dev/null /var/adm/syslog/syslog.log #cat …