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 Continue reading “CentOS 7 Server Installation with Software RAID” »
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. Continue reading “Install MySQL 5.7 on CentOS 7” »
I got 5 Public IPs. i’m Gonna configure them, so Postfix can use multiple interfaces/ips for outgoing smtp connections.
First we need creating Interface aliases for those 5 public IPs.
In my system, using centos:
# cd /etc/sysconfig/network-scripts/ # cp ifcfg-eth0 ifcfg-eth0:1
Edit ifcfg-eth0:1 # vi ifcfg-eth0\:1
DEVICE=eth0 <-- default device HWADDR=XX:XX:XX:XX:XX:XX ONBOOT=yes TYPE=Ethernet BOOTPROTO=none IPADDR=202.XXX.XX.2 <-- default eth0 IP address PREFIX=24 GATEWAY=202.XXX.XX.1 DNS1=202.XXX.XX.XX
Change DEVICE and IPADDR parameters Continue reading “Postfix SMTP Rotating IP using IPTables” »
Step 1: Add MariaDB Yum Repository
Start by adding the MariaDB YUM repository file MariaDB.repo for RHEL/CentOS and Fedora systems.
# nano /etc/yum.repos.d/MariaDB.repo
Now add the following lines to your respective Linux distribution version as shown.
[mariadb] name = MariaDB baseurl = http://yum.mariadb.org/10.1/centos7-amd64 gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB gpgcheck=1
Continue reading “Install MariaDB 10 on Centos or Springdale Linux” »
Disable on Centos/RHEL system:
1. Append below lines in /etc/sysctl.conf:
net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1
NOTE : To disable IPv6 on a single interface add below lines to /etc/sysctl.conf :
net.ipv6.conf.[interface].disable_ipv6 = 1 ### put interface name here [interface] net.ipv6.conf.default.disable_ipv6 = 1
2. To make the settings affective, execute :
# sysctl -p
Disable on Debian/Ubuntu system:
One method to make this option persist is modifying /etc/sysctl.conf. Add the following lines to the file:
net.ipv6.conf.all.disable_ipv6=1 net.ipv6.conf.default.disable_ipv6=1 net.ipv6.conf.lo.disable_ipv6=1
For the settings to take effect use:
sudo sysctl -p
Well, in my working domain I face these tools to be installed, so that most of the dependent tools or programs that need to be deployed later don’t face much of dependency issue. So here goes the installation process for both the OS.
On CentOS/RHEL system use the follwoing command (either one of it would work)-
Type the following yum command as root user:
# yum group install "Development Tools"
Continue reading “Install Development Tool on CentOS and Debian” »
Install Dependencies
Install Extra Packages for Enterprise Linux (EPEL)
# sudo yum install epel-release wget -y
Install Dynamic Kernel Module Support (DKMS)
# sudo yum --enablerepo=epel install dkms -y
This will install quite a few packages:
Install Development Tools
# sudo yum groupinstall "Development Tools" -y
Continue reading “Install VirtualBox legacy version 5.x on CentOS 7” »
1. To disable the Network Manager service, perform the following steps:
Disable Network Manager with the following commands:
CentOS 6, CloudLinux 6, Red Hat Enterprise Linux 6 (RHEL), or Amazon Linux:
service NetworkManager stop chkconfig NetworkManager off
CentOS 7, CloudLinux 7, or RHEL 7:
systemctl stop NetworkManager systemctl disable NetworkManager
2. Change to the /etc/sysconfig/network-scripts directory.
3. Open the ifcfg-eth0 and ifcfg-lo files with your preferred text editor and, if they exist, set the following keys’ Continue reading “How to Disable Network Manager on CentOS 7” »
********
Applicable for vesta cp 1.0.0-5 version)
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If you lately encounter an issue with mail incoming with vesta cp after an auto update took place, your /var/log/exim/main.log shows something similar below-
2021-12-19 03:39:42 1mxheU-000374-0o == mail@domain.com R=localuser T=local_delivery defer (-1): Malformed value “0MM” (expansion of “${extract{6}{:}{${lookup{$l$….
Step-1 Finding vesta version
Well the following steps I had to do to solve. Before further proceedings we need to find out vesta version. My particular version 1.0.0-5 is generating this error of receiving email- specially where disk quota of email users had “Unlimited” quota. Continue reading “Fixing Vesta CP Exim Email Incoming error with T=local_delivery defer (-1): Malformed value “0MM”” »
To clone your VM and spawn new instances in KVML
# virt-clone --original {Domain-Vm-Name-Here} --auto-clone
OR
# virt-clone --original {Domain-Vm-Name-Here} --name {New-Domain-Vm-Name-Here} --auto-clone
OR
# virt-clone --original {Domain-Vm-Name-Here} \
--name {New-Domain-Vm-Name-Here} --file {/var/lib/libvirt/images/File.Name.here}
Continue reading “Cloning KVM virtual machine using CLI” »