Postfix SMTP Rotating IP using IPTables Rumi, August 1, 2022 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… Continue Reading
vestacp open: /etc/named.conf: permission denied Rumi, August 1, 2022 This was the error I was getting after a doing a little change in the named.conf in my newly installed vesta control panel. While restarting the named, I was getting this error- [root@vesta2 ~]# systemctl status named.service ● named.service – Berkeley Internet Name Domain (DNS) Loaded: loaded (/usr/lib/systemd/system/named.service; enabled; vendor… Continue Reading
Observium Installer Script on Ubuntu 20.04 or Debian 11 Rumi, July 25, 2022 Automated Installation Observium has an automated install script for use on Ubuntu and Debian systems. Using the automated installation script is as easy as downloading it, running it and answering a few simple questions, start with: wget http://www.observium.org/observium_installscript.sh chmod +x observium_installscript.sh ./observium_installscript.sh You may need to install wget on bare… Continue Reading
Enabling Ping requests to OCI Instance Rumi, June 29, 2022 If you want to test with Ping requests you’ll need to modify the Ingress rules on the security list associated with the VCN, Subnet, network device, thing, what ever, to allow ICMP packets. Allowing ICMP traffic is not required, it’s an option. Please only take this option if you understand… Continue Reading
Generating an SSH Key Pair on Windows Using the PuTTYgen and use it on OCI with machine instance Rumi, June 29, 2022 The PuTTYgen program is part of PuTTY, an open source networking client for the Windows platform. To generate an SSH key pair on Windows using the PuTTYgen program: Download and install PuTTY or PuTTYgen.To download PuTTY or PuTTYgen, go to http://www.putty.org/ and click the You can download PuTTY here link…. Continue Reading
Install MariaDB 10 on Centos or Springdale Linux Rumi, June 18, 2022 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
Disable ipv6 on Linux Machine Rumi, June 18, 2022 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… Continue Reading
Install Development Tool on CentOS and Debian Rumi, June 17, 2022 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… Continue Reading
Install Proxmox VE 7 on Debian 11 (Bullseye) Rumi, June 17, 2022July 18, 2023 Step 1: Update Debian OS Ensure your Debian 11 (Bullseye) operating system is upgraded. sudo apt -y update && sudo apt -y upgrade Once the upgrade process is complete, reboot the server sudo systemctl reboot Step 2: Set Proxmox Server hostname Let’s set a hostname on the server sudo hostnamectl… Continue Reading
Delete Old Unused Kernels in Debian Rumi, June 17, 2022 To find out the current version of Linux kernel running on your system, use the following command. $ uname -sr Linux 4.12.0-041200-generic To list all installed kernels on your system, issue this command. $ dpkg -l | grep linux-image | awk ‘{print$2}’ linux-image-4.12.0-041200-generic linux-image-4.8.0-22-generic linux-image-extra-4.8.0-22-generic linux-image-generic Remove Old Unused Kernels… Continue Reading