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Linux Sysadmins – Linux Guides, Nix Guides, Tutorials, Tips & Tricks.

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Troubleshooting / Ubuntu Linux

Configure network interface using NMCLI on Ubuntu 22.04 LTS

Posted on: September 7, 2023September 5, 2023

By default Ubuntu 22.04 LTS Jammy Jellyfish enabled with netplan network configuration using YAML format. If you are comfortable with using nmcli we need to install Network Manager […]

Troubleshooting

LEAPP Upgrade failed with more space needed on the / filesystem

Posted on: May 22, 2023May 21, 2023

LEAPP Upgrade from RHEL 7 to 8 fails for lack of space, The actual error while performing a LEAPP upgrade. Just we need to increase the size of […]

Directory Servers / Troubleshooting

Solution for IPA Error 4203: DatabaseError

Posted on: July 12, 2021March 6, 2022

Quick solution to fix the IPA error 4203 database error while adding new users from the IDM web interface.

Troubleshooting

Change default kernel to boot in RHEL 8 | Easy guide

Posted on: December 13, 2020March 6, 2022

A how-to guide to Set the default kernel in RHEL based operating system. This may be required when we are installed with multiple kernel versions in our Linux servers.

Troubleshooting

grub2-editenv: error: environment block too small | Simple Solution

Posted on: December 12, 2020March 6, 2022

A quick guide to resolve the “grub2-editenv: error: environment block too small” error when the grubenv file size exceeds the expected 1024 bytes.

Troubleshooting

vSAN cluster UUID mismatch | 1 Quick Solution

Posted on: August 16, 2020March 6, 2022

A quick solution to resolve vSAN cluster UUID mismatch in VMware environment.

Troubleshooting

Recover from Starting Switch Root or corrupted Glibc

Posted on: April 1, 2020March 6, 2022

While starting the server it will not move forward after “Starting Switch Root”. Step by Step let’s see how to fix this issue.

Troubleshooting

Recover from chmod 777 permission on a root filesystem

Posted on: March 31, 2020March 6, 2022

How to Recover from accidentally running chmod -R 777 / on any RPM-based Linux Operating systems.

Troubleshooting

How to fix Grub Rescue in CentOS and RHEL 7

Posted on: January 19, 2020March 6, 2022

A fix for boot issue (Grub rescue) will be carried out by sysadmins by following few steps. A brief guide on how to recover GRUB and UEFI based servers.

Troubleshooting

Your account are not allowed to access to crontab because of pam configuration.

Posted on: April 9, 2019March 6, 2022

A password expiry error will be thrown, account are not allowed to create a cron job by saying PAM configuration in place.

Posts pagination

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  1. Gerald on Single Node OKD (OpenShift) Setup: A Fast and Easy GuideDecember 15, 2024

    Hi, in the 'Starting with Bootstrapping' step I have this error: DEBUG Still waiting for the Kubernetes API: Get "https://api.xxx.local:6443/version":…

  2. jos on How to Configure Sudo email alertMarch 4, 2022

    Hi! Some way to send commands write as root by email? Thanks!

  3. paul on Monitoring Proxmox with InfluxDB and Grafana in 4 Easy stepsMarch 1, 2022

    Tried 12966 per your example, got error "failed to import dashboard."

  4. Anonymous on Migrate existing Iptables to Nftables in RHEL8/CentOSFebruary 27, 2022

    I followed the procedures and successfully loaded some weird 8081 port configurations needed for the app, however I discovered it…

  5. sy on Install Ansible AWX on Kubernetes in 5 minutesFebruary 17, 2022

    tried many times - followed all steps but was unable to setup custom context I always get -> The connection…

Ansible (11) Apache (5) Docker (7) foreman (5) IDM Server (7) Kubernetes (14) linux commands (5) Linux networking (10) Linux Security (5) Logical Volume Management (13) OpenShift (8) Oracle Database (5) Solaris 11 (4) Solaris OS (6) VMware (5)

  • OKD Cluster (OpenShift) Installation on Bare Metal
  • Configuring HAProxy LB for OKD HA Cluster
  • Configuring DHCP Server for OKD HA Clusters
  • Configuring BIND DNS Server for OKD HA Clusters
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