Brain's Workbench
mirrorlist.centos.org doesn’t exists anymore. So, your default repor wwith yum doesn’t work. Try using the following processes, it worked for me, hope this works for others as well.
sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo
Ref:
https://serverfault.com/questions/1161816/mirrorlist-centos-org-no-longer-resolve
You need to have a console access for running this operation.
1. Inside java or HTML5 console, please reboot your server and wait for the GRUB menu
2. Inside the GRUB menu select your first entry and press “E” key to edit.
3. Find a line with ro and change it to rw
Update Docker Package Database. In a terminal window, type:
sudo yum check-update
Remove if any docker is preinstalled with your OS-
sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine
Install the Dependencies
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
The –y switch indicates to the yum installer to answer “yes” to any prompts that may come up. The yum-utils switch adds the yum-config-manager. Docker uses a device mapper storage driver, and the device-mapper-persistent-data and lvm2 packages are required for it to run correctly.
Lately I needed an update of PHP (7.2 to 7.4) on my WHMCS CentOS 7 built box- here’re the process that I followed. But before that, I’m sharing my original post on setting up WHMCS on CentOS 7
Since I used remi repository to install version 7.2, I’ll be doing the same as well-
root@portal:~# yum-config-manager --enable remi-php74 root@portal:~# yum update
Now install PHP 7.4 with all necessary modules with the command below-
Was just playing around. It’s a great home entertainment tool indeed.
Method-1: Creating repository and using Yum
To enable the Plex repository open your text editor and create a new YUM repository configuration file named plex.repo in /etc/yum.repos.d/ directory:
[PlexRepo] name=PlexRepo baseurl=https://downloads.plex.tv/repo/rpm/$basearch/ enabled=1 gpgkey=https://downloads.plex.tv/plex-keys/PlexSign.key gpgcheck=1
Method-2: Installation using RPM
download the package for your Linux distro. It is much easier to do this by simply coping the download link location with right click and then you can run:
$ sudo rpm -ivh https://downloads.plex.tv/plex-media-server/1.13.8.5395-10d48da0d/plexmediaserver-1.13.8.5395-10d48da0d.x86_64.rpm
Alternatively, you can download the package on your system with wget command as shown.
$ wget https://downloads.plex.tv/plex-media-server/1.13.8.5395-10d48da0d/plexmediaserver-1.13.8.5395-10d48da0d.x86_64.rpm
If you’ve used install base using yum repo- you now need to install it, otherwise if you’re with RPM installation, you already have plex installed.
Install Module
CentOS 7 comes with bridging module loaded on system boot by default. Use the following command to verify whether the module is loaded or not.
# modinfo bridge filename: /lib/modules/3.10.0-327.el7.x86_64/kernel/net/bridge/bridge.ko alias: rtnl-link-bridge version: 2.3 license: GPL rhelversion: 7.2 srcversion: 905847C53FF43DEFAA0EB3C depends: stp,llc intree: Y vermagic: 3.10.0-327.el7.x86_64 SMP mod_unload modversions signer: CentOS Linux kernel signing key sig_key: 79:AD:88:6A:11:3C:A0:22:35:26:33:6C:0F:82:5B:8A:94:29:6A:B3 sig_hashalgo: sha256
If the module is not loaded, you can load it using the following command.
Step 1. First, you need to enable the EPEL repository on your system.
yum install epel-release yum -y update
Step 2. Installing Transmission on CentOS 7.
Just run the following command to install Transmission:
yum install transmission-cli transmission-common transmission-daemon
Once complete, you can verify Transmission is installed by running the below command:
systemctl start transmission-daemon.service systemctl stop transmission-daemon.service
Step 3. Configuration Transmission.
Edit the transmission settings.json config file:
Welcome to Getting started with Xen Virtualization On CentOS 7.x. Xen is an open-source bare-metal hypervisor which allows you to run different operating systems in parallel on a single host machine. This type of hypervisor is normally referred to as a hypervisortype 1 in Virtualization world.
Meltdown and Spectre Mitigation on Xen 6.5 and Xen 7.x
Xen is used as a basis for Server virtualization, Desktop virtualization, Infrastructure as a service (IaaS) and embedded/hardware appliances. The ability of physical host system to run multiple guest VMs can vastly improve the utilization of the underlying hardware.
Cutting-edge features of Xen hypervisor
Xen is operating system agnostic – Main control stack (domain 0) can be Linux, NetBSD, OpenSolaris e.t.c
Driver Isolation capability – Xen can allow the main device driver for a system to run inside of a virtual machine. The VM can be rebooted in case of driver failure/crash without affecting the rest of the system.
Paravirtualization support: This allows fully paravirtualized guests to run much faster as compared to a fully virtualized guest using hardware virtualization extensions (HVM).
Install the Operating System
Boot from the USB flash drive and select Install CentOS 7
When the welcome screen of the CentOS installer appears, choose your language and just click on Continue
Preqrequsite:
It’s better to have installed development tools and disable NetworkManager for a produciton envrionment. You can optionally follow the steps-
Disabling NetworkManager:
systemctl stop NetworkManager
systemctl disable NetworkManager
Install Development Tools:
yum group install "Development Tools"
Remove MariaDB pre-installed libraries-
yum -y remove mariadb-libs
Enable MySQL Repository
First of all, You need to enable MySQL 5.7 community release yum repository on your system. The rpm packages for yum repository configuration are available on MySQL’s official website.
First of all, import the latest MySQL GPG key to your system.
sudo rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
Now, use one of the below commands to configure the Yum repository as per your operating system version.