Details: admin; Redhat / CentOS; 01 September 2014

The error message bellow will be display on your Redhat 7 linux system after a fresh RHEL 7 system installation. It simply means that in order to get system updates and also to install new software you need to configure package repositories.

Loaded plugins: product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
There are no enabled repos.
 Run "yum repolist all" to see the repos you have.
 You can enable repos with yum-config-manager --enable

Details: admin; Redhat / CentOS; 01 September 2014

On Redhat Linux system's the ifconfig command to display system IP address has become obsolete. Currently, to view an IP address on your RHEL 7 system enter the following linux command:

# ip addr show
OR
# ip a s
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:15:38:b7 brd ff:ff:ff:ff:ff:ff
    inet 10.1.1.110/8 brd 10.255.255.255 scope global enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe15:38b7/64 scope link 
       valid_lft forever preferred_lft forever

Details: admin; Redhat / CentOS; 01 September 2014

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

Details: admin; Redhat / CentOS; 29 July 2014

Below are basic configuration instructions to setup static IP address on Redhat Enterprise Linux ( RHEL7 ). First, list your network interfaces with ip command:

# ip addr show
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:15:38:b7 brd ff:ff:ff:ff:ff:ff
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe15:38b7/64 scope link 
       valid_lft forever preferred_lft forever

Details: admin; Redhat / CentOS; 22 July 2014

Introduction

Logrotate is a utility designed for administrators who manage servers producing a high volume of log files to help them save some disk space as well as to avoid a potential risk making a system unresponsive due to the lack of disk space. Normally, a solution to avoid this kind of problem is to setup a separate partition or logical volume for a /var mount point. However, logrotate may also be a viable solution to this problem especially if it is too late to move all logs under different partition. In this article we will talk about usage and configuration of logrotate on RedHat / CentOS Linux server.

What is Logrotate

Logrotate provides an ability for a system administrator to systematically rotate and archive any log files produced by the system and thus reducing a operating system's disk space requirement. By default logrotate is invoked once a day using a cron scheduler from location /etc/cron.daily/

# ls /etc/cron.daily/
cups  logrotate  makewhatis.cron  mlocate.cron  prelink  readahead.cron  rhsmd  tmpwatch

RHEL 7 - Solution to "There are no enabled repos" message

How to display system's IP address on RHEL 7

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

Configuring network interface with Static IP address on RHEL 7

Setting Up Logrotate on RedHat Linux

Introduction

What is Logrotate