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DevOps
Systems Administration
Red Hat Enterprise Linux
August 3, 2023
Table of Contents
[ERROR][worker-0] gofer.messaging.adapter.connect
Change user information
Change user login shell
Configuring Red Hat Subscription Manager
Deprecated SSH Cryptographic Settings Vulnerabilites
Disk quota exceeded
Disk usage is not responding
Extending filesystems
File checksums
grep: memory exhausted
Login/Logout Events /var/log/tallylog
Mount points not accessible
Mounting filesystems
My system configuration files have been modified /etc
Network connection tests
Package Management
Password Manager
Port scanning – Connection refused
Process Accounting /var/account/pacct
Recover root password
Removing old kernels
Routing table
SCP vs RSYNC
SSH Access Not Granted
SSH key requirements
SSH key-based authentication disallowed
SSL/TLS certificate – extracting data from PFX/P12
SSL/TLS certificate problem: EE certificate key too weak
sudo: unknown uid *: who are you?
Unable to SSH into {{ HOST }}
Unable to sudo
User Management
User Management – Password Authentication vs SSH Key Authentication
Vulnerability scanning
Your account has expired; please contact your system administrator
yum update – Error: Transaction test error
devops
,
Linux
,
Red Hat
,
systems-administration
Written By victord On August 3, 2023