memtest+ redhat 7 grub menu available

Installation of Memtest+ RAM memory test tool on Redhat 7 Linux

Installation of Memtest+ RAM memory test tool on Redhat 7 Linux

Memtest is a quite handy tool when troubleshooting hardware problem and specifically problems related to Random Access Memory (RAM). After installation the memtest+ tool will become available among other boot options. To install memtest+ on RHEL 7 Linux server execute the following linux command:

# yum install memtest86+
Running transaction
  Installing : memtest86+-4.20-12.el7.x86_64      1/1 
  Verifying  : memtest86+-4.20-12.el7.x86_64      1/1 

  memtest86+.x86_64 0:4.20-12.el7

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Open http port 80 firewall rule on RHEL7 linux httpd

How to open http port 80 on Redhat 7 Linux using firewall-cmd

By default the port 80 for http connection is filtered on Redhat 7 as you can only access this port from the actual localhost and not from any other public host. To open a port 80 on RHEL 7 Linux we need to add an iptables rule. For this RHEL7 uses firewall-cmd. First add your port 80 rule with a following linux command:

[root@rhel7 ~]# firewall-cmd --zone=public --add-port=80/tcp --permanent

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Monitor CPU temperature on Redhat 7 Linux

How to monitor a CPU temperature on Redhat 7 Linux system

Here is a short config to show you how to display and monitor CPU temperature on a Linux system running Redhat 7 Linux. First we need to install lm_sensors:

# yum install lm_sensors

Next, use sensors command to display CPU temperature:

$ sensors | grep Core
Core 0:         +43.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:         +43.0°C  (high = +86.0°C, crit = +100.0°C)

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How to install, manage, start and autostart ssh service on RHEL 7 Linux

systemctl command is used on RedHat 7 linux to manage services system wide. It allows administrators to manage ssh service to start, restart, stop or enable autoload after system startup.

In install ssh service on your RHEL 7 linux run a following linux command:

# yum install openssh

By defalt SSH service or to be more precise sshd ( daemon ) is disabled. Once the opensshd package installed, you can check the status of SSHD service by using the below command:

# systemctl status sshd
sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled)
   Active: inactive (dead)

To start ssh daemon (sshd) on RHEL 7 run:

systemctl start sshd

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How to reset the root password in RHEL7/CentOS7/Scientific Linux 7- based systems


Resetting the root password in RHEL7/CentOS7/Scientific Linux 7


RHEL7 / CentOS7 / Scientific Linux 7




Things have changed in the RHEL7 world and so has the preferred way of resetting the root password. Although the old way of interrupting the boot process (init=/bin/bash) still works, it is no longer bulletproof and recommended.
‘Systemd’ uses ‘rd.break’ to interrupt the boot. Let’s have a quick walk through the whole procedure.

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VNC connection to RHEL

Configuring VNC Server Access on a Redhat Linux

Most of the time as a Linux system administrator you are managing your servers over the network. It is very rare that you will need to have a physical access to any of your managed servers. In most cases all you need is to SSH remotely to do your administration tasks. In this article we will configure a GUI alternative to a remote access to your RHEL server, which is VNC. VNC allows you to open a remote GUI session to your server and thus providing you with a full graphical interface accessible from any remote location.

In this tutorial you will learn:

  • How to install required VNC packages
  • How to setup and start the VNC server on RHEL
  • How to connect to a graphical session remotely
  • How to run graphical programs in the xterm session

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