OS

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“This system is not registered to Red Hat Insights” after log in to Rocky Linux 8.5

If you have warning messages such as after your login to your

This system is not registered to Red Hat Insights. See https://cloud.redhat.com/
To register this system, run: insights-client --register

To remove the warning permanently, you can do a 

# dnf remove insights-client

References:

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Installing MLNX_OFED 5.5-1 on Rocky Linux 8.5

If you are installing MLNX-OFED-5.5-1 on Rocky Linux 8.5, you may want to download the drivers from Nvidia Linux Drivers

Step 1: Installing Prerequistics

# dnf install tk tcsh tcl gcc-gfortran kernel-modules-extra

Step 2a: Installing MLNX on Rocky 8.5

If you just do a ./mlnxofedinstall 

# ./mlnxofedinstall
Current operation system is not supported!

Step 2b: Force Install with the right distro.

# ./mlnxofedinstall --distro rhel8.5 --force
.....
.....
.....
Device #1:
----------

  Device Type:      ConnectX5
  Part Number:      MCX512F-ACH_Ax_Bx
  Description:      ConnectX-5 EN network interface card; with host management 25GbE Dual-port SFP28; PCIe3.0 x16; ROHS
  PSID:             MT_0000000416
  PCI Device Name:  10:00.0
  Base GUID:        xxxxxxxxxxxx
  Base MAC:         yyyyyyyyyyyy
  Versions:         Current        Available
     FW             16.31.1014     16.32.1010
     PXE            3.6.0403       3.6.0502
     UEFI           14.24.0013     14.25.0017

  Status:           Update required

After installing…….

Restart needed for updates to take effect.
Log File: /tmp/PAl8Z5mkHc
Real log file: /tmp/MLNX_OFED_LINUX.150443.logs/fw_update.log
To load the new driver, run:
/etc/init.d/openibd restart

Step 3: You have to remove and reload the drivers before you can do the /etc/init.d/openibd restart

[root@h00 media]# modprobe -rv ib_isert rpcrdma ib_srpt
rmmod ib_isert
rmmod iscsi_target_mod
rmmod rpcrdma
rmmod ib_srpt
[root@h00 media]# /etc/init.d/openibd restart
Unloading HCA driver:                                      [  OK  ]
Loading HCA driver and Access Layer:                       [  OK  ]

References:

  1. Driver Installation of Mellanox InfiniBand
  2. Mellanox NIC driver: Current Operation System is not supported
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Disable the web console message from Cockpit on Rocky Linux 8.5

When you logged on to Rocky Linux 8.5, you may see this message. 

Activate the web console with: systemctl enable --now cockpit.socket

This system is not registered to Red Hat Insights. See https://cloud.redhat.com/
To register this system, run: insights-client --register

If you wish to disable the message, you may want to 

rm -f /etc/motd.d/cockpit

The command will remove the symlink to file /run/cockpit/motd

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Setting up NTP Client in Rocky Linux 8.5

Prerequisites Step 1: Endure you are in the correct time zone

# timedatectl
               Local time: Wed 2022-04-20 10:04:44 +08
           Universal time: Wed 2022-04-20 02:04:44 UTC
                 RTC time: Wed 2022-04-20 02:04:44
                Time zone: Asia/Singapore (+08, +0800)
System clock synchronized: no
              NTP service: active
          RTC in local TZ: no

Prerequisites Step 2: List Time Zone

# timedatectl list-timezones
.....
Asia/Singapore
.....

Prerequisites Step 3: Set Time Zone

# timedatectl set-timezone Asia/Singapore

In Rocky Linux 8.5, the ntp package is no longer supported and it is implemented by the chronyd (a daemon that runs in user-space) which is provided in the chrony package.

chrony works both as an NTP server and as an NTP client, which is used to synchronize the system clock with NTP servers.

To install the chrony suite, use the DNF Package Manager.

# dnf install chrony

Enable the Service

# systemctl start chronyd
# systemctl status chronyd
# systemctl enable chronyd

Check it is synchronised 

[root@h00 etc]# timedatectl
               Local time: Wed 2022-04-20 10:19:56 +08
           Universal time: Wed 2022-04-20 02:19:56 UTC
                 RTC time: Wed 2022-04-20 02:19:56
                Time zone: Asia/Singapore (+08, +0800)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Setting up NTP Client Using Chrony in Rocky Linux 8.5

# vim /etc/chrony.conf
.....
pool sg.pool.ntp.org iburst
.....
# systemctl restart chronyd

Show the current time sources that chronyd is accessing

# chronyc sources
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^? 178.128.223.142               0   6     0     -     +0ns[   +0ns] +/-    0ns
.....
.....
.....

References:

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Comparison between the /etc/os-release of RHEL-8.5 and Rocky Linux 8.5

Rocky Linux is a production-ready downstream version of Red Hat Enterprise Linux started by original founder of CentOS, Gregory Kurtzer. the OS is almost identical under intensive development by the community.

For RHEL-8.5, 

NAME="Red Hat Enterprise Linux"
VERSION="8.5 (Green Obsidian)"
ID="rhel"
ID_LIKE=”fedora"
VERSION_ID=”8.5"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Red Hat Enterprise Linux 8.5 (Green Obsidian)"
ANSI_COLOR="0;31"
CPE_NAME=”cpe:/o:redhat:enterprise_linux:8.5:GA”
HOME_URL=”https://www.redhat.com/”
DOCUMENTATION_URL=”https://access.redhat.com/documentation/red_hat_enterprise_linux/8/”
BUG_REPORT_URL=”https://bugzilla.redhat.com/”

For Rocky-Linux-8.5,

NAME="Rocky Linux"
VERSION="8.5 (Green Obsidian)"
ID="rocky"
ID_LIKE="rhel centos fedora"
VERSION_ID="8.5"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Rocky Linux 8.5 (Green Obsidian)"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:rocky:rocky:8.5:GA"
HOME_URL="https://rockylinux.org/"
BUG_REPORT_URL="https://bugs.rockylinux.org/"
ROCKY_SUPPORT_PRODUCT="Rocky Linux"
ROCKY_SUPPORT_PRODUCT_VERSION="8"
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abrtd daemon deleting recently created application core dumps on CentOS 7

When I did the command “systemctl status abrtd.service”, I’ve noticed the following

[root@node1 ~]# systemctl status abrtd.service
● abrtd.service - ABRT Automated Bug Reporting Tool
   Loaded: loaded (/usr/lib/systemd/system/abrtd.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2022-01-19 09:52:50 +08; 2 months 11 days ago
 Main PID: 1113 (abrtd)
   CGroup: /system.slice/abrtd.service
           └─1113 /usr/sbin/abrtd -d -s


Apr 01 22:29:43 node1 abrt-server[361048]: Package 'rapidfile' isn't signed with proper key
Apr 01 22:29:44 node1 abrt-server[361048]: 'post-create' on '/var/spool/abrt/ccpp-2022-04-01-22:29:29-360942' exited with 1
Apr 01 22:29:44 node1 abrt-server[361048]: Deleting problem directory '/var/spool/abrt/ccpp-2022-04-01-22:29:29-360942'
Apr 01 22:53:14 node1 abrt-server[423453]: Executable '/usr/local/intel/2019u5/intelpython3/bin/python3.6' doesn't belong to any package and ProcessUnp...et to 'no'
Apr 01 22:53:14 node1 abrt-server[423453]: 'post-create' on '/var/spool/abrt/ccpp-2022-04-01-22:52:40-420563' exited with 1
Apr 01 22:53:14 node1 abrt-server[423453]: Deleting problem directory '/var/spool/abrt/ccpp-2022-04-01-22:52:40-420563'
Apr 01 23:55:22 node1 abrt-server[432522]: '.' does not exist
Apr 01 23:55:23 node1 abrt-server[432522]: 'post-create' on '/var/spool/abrt/ccpp-2022-04-01-23:55:09-432449' exited with 1
Apr 01 23:55:23 node1 abrt-server[432522]: Deleting problem directory '/var/spool/abrt/ccpp-2022-04-01-23:55:09-432449'
Apr 01 23:55:23 node1 abrt-server[432522]: '/var/spool/abrt/ccpp-2022-04-01-23:55:09-432449' does not exist
Hint: Some lines were ellipsized, use -l to show in full.

The Issue seems to be caused by

  • The abrtd daemon deletes recently created core dumps
  • Error: Package isn’t signed with proper key

According to Red Hat Knowledge Base “Why does the abrtd daemon delete recently created application core dumps?”, the resolution can be simply

% vim /etc/abrt/abrt-action-save-package-data.conf 
OpenGPGCheck = no
ProcessUnpackaged = yes

Restart the abrtd daemon – as root – for the new settings to take effect:

# systemctl restart abrtd.service

According to Red Hat, the root cause is written as followed:
When the OpenGPGCheck variable is set to yes (the default setting), this informs ABRT to only analyse and handle crashes in applications provided by packages which are signed by the GPG keys whose locations are listed in the /etc/abrt/gpg_keys file. Setting OpenGPGCheck = no, tells ABRT to catch crashes in all programs. Also, abrt is configured to capture coredump of files installed from rpm only. Variable ‘ProcessUnpackaged’ tells abrt to keep the coredump even if application is not installed via rpm/yum.

References:

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Top 10 videos from Red Hat Developer

Podman: A Linux tool for working with containers and pods Get started with Podman, an open source, Linux-based tool that builds Docker-compatible container images.

Easily secure your Spring Boot applications with Keycloak Discover how to deploy and configure a Keycloak server and then secure a Spring Boot application.

Learn how to move your existing Java app to Kubernetes—without changing a single line of code Using the free Developer Sandbox for Red Hat OpenShift, we demo how you can take your existing source code or create a new application and easily deploy and manage them as containers.

KBE Insider (E3): Luke Hinds We talk to Luke Hinds, Security Lead for Office of CTO, Red Hat, about his work on the Kubernetes Security Response Team, Sigstore, and the Kubernetes HackerOne Bug Bounty Program.

Local OpenShift environment on Windows with Red Hat CodeReady Containers Brian Tannous walks through getting a local OpenShift environment installed on Windows using Red Hat CodeReady Containers.

Securing apps and services with Keycloak authentication | DevNation Tech Talk See how to easily secure all of your applications and services, regardless of how they’re implemented and hosted, with Keycloak—all with little-to-no code required.

A deep dive into Keycloak | DevNation Tech Talk This tutorial introduces Keycloak, an open source identity and access management solution for modern applications and services.

Secure Spring Boot Microservices with Keycloak | DevNation Tech Talk In this interactive, live-coding session, you’ll explore the Spring Boot adapter provided by Keycloak.

KBE Insider (E5): Savitha Raghunathan We talk to Savitha Raghunathan, Senior Software Engineer at Red Hat, about her work and experience as an open source contributor within the Kubernetes ecosystem.

Apache Kafka + Debezium | DevNation Tech Talk This tutorial explores how to use Apache Kafka and Debezium. Learn how to use change data capture for reliable microservices integration.
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Install and Enable EPEL Repository for CentOS 7.x

The EPEL is an acronym for Extra Packages for Enterprise Linux. The EPEL repository used by the following Linux Distributions:

  • Red Hat Enterprise Linux (RHEL)
  • CentOS
  • Oracle Linux

On the Terminal,

Install EPEL Repository 

# yum -y install epel-release

Refresh EPEL Repository

# yum repolist

Install Packages from EPEL Repository

# yum install -y htop

Search and install Package (E.g. htop)

# yum --disablerepo="*" --enablerepo="epel" list available | grep 'htop'

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CentOS Replacement Rocky Linux Is Now in GA and Under Independent Control

The Rocky Enterprise Software Foundation (RESF) is announcing the general availability of Rocky Linux, release 8.4, designed as a drop-in replacement for the soon-to-be discontinued CentOS. The GA release is launching six-and-a-half months after Red Hat deprecated its support for the widely popular, free CentOS server operating system.

HPC Wire 21-June-2021 ()

For more information, do take a look at CentOS Replacement Rocky Linux is now in GA and Under Independent Control

Do take a look at Rocky Linux site