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Network configuration in Ubuntu 18.04 LTS using netplan

by SupportPRO Admin
written by SupportPRO Admin

With Ubuntu 18.04 onwards, configuring IP addresses stands different from the older versions. When comparing with the previous versions the Ubuntu is using a new utility called Netplan – another order line arrange design utility, to arrange an IP address. Netplan has been presented by Ubuntu engineers in Ubuntu 17.10 where we no longer use the “interfaces” file to configure IP address but does the task using a YAML file with all default arrangement documents found under /etc/netplan/ directory. In this blog, we will check on how to design static …

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Server SecurityServer TweakingTechnical Articles

CVE-2017-5638: Apache Struts 2 Vulnerability

by Bella
written by Bella

Apache Struts 2 is an open-source framework widely used for developing Java web applications. On March 6, 2017, a critical security vulnerability identified as CVE-2017-5638 was publicly disclosed. This flaw allowed attackers to execute remote code on vulnerable servers by sending specially crafted malicious requests. The vulnerability occurs when a server processes file uploads using a Jakarta-based multipart parser. Attackers can exploit this weakness by embedding malicious commands within the Content-Type header of a file upload request. When processed by affected versions of Apache Struts 2, the server may execute …

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General TopicsServer TweakingTechnical Articles

Configuration of HAProxy Load Balancer on CentOS

by Bella
written by Bella

HAProxy stands for High Availability Proxy.  It is a very fast and reliable solution for high availability and load balancing. HAProxy is used as TCP/HTTP Load Balancer and for proxy Solutions. The HAProxy application will share the workload with multiple servers. Steps for Installation and Configuring  HAProxy =========== Step 1: Before proceeding with the installation of  HAProxy in the server, we need to install the epel repository on our system depending on the operating system version using the following command.

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General TopicsServer TweakingTechnical Articles

Monitor Real Time Resource Usage in CloudLinux :: lvetop

by Bella
written by Bella

CloudLinux is one of the widely used Operating System nowadays due to the high-level stability and advanced server security it provides, which makes it the first preference for hosting providers, especially in a shared hosting environment. LVE (Lightweight Virtual Environment) is a kernel-level technology developed by the CloudLinux team. It is lightweight and transparent. The goal of LVE is to make sure that no single website can bring down your web server. The kernel makes sure that all LVEs get a fair share of the server’s resources, and that no …

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General TopicsLinux BasicsServer TweakingTechnical Articles

Zend OpCache

by Bella
written by Bella

The Zend OpCache provides faster PHP execution through opcode caching and optimization. It improves PHP performance by storing precompiled script bytecode in the shared memory. Installing Zend OPCache on PHP 5.3 or 5.4 1. Login to SSH on your server 2. Type the following commands: #cd /usr/local/src #wget http://pecl.php.net/get/ZendOpcache # to get the latest (master) build do the following instead:

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MiscellaneousServer TweakingTechnical Articles

Icinga2 for CentOS7

by Bella
written by Bella

Icinga is a fork of Nagios monitoring system. There are lots of changes and upgrades compared to Nagios, especially in version 2. The main visible difference is UI which is built on ext js. Other significant differences are in hosts and services definitions. Icinga2 designed to monitor large complex environments. Pre-requisites We need to make sure to install a LAMP stack and epel repository on the CentOS7 server for other dependency application which will support icinga2 . Icinga2 will collect the service information based on the monitoring plugins, so we …

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General TopicsServer Tweaking

The extra second in June 30, 2015 – The Leap Second !

by Bella
written by Bella

The International Earth Rotation & Reference Systems Service (IERS) has mentioned that an extra second is to be added to Coordinated Universal Time (UTC) at 23:59:59 on 30 June 2015 and this is to make sure the alignment of astronomical and atomic time. Coordinated Universal Time, UTC is one of the basic time conventions used by most of the world’s local time zones. This UTC time convention has been derived from a bunch of atomic clocks that are distributed across several countries globally. The rotation of our earth is not …

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Unable to fork: Cannot allocate memory
Linux BasicsServer Tweaking

OpenVZ Fix: Unable to Fork Error ‘Cannot Allocate Memory Solution’

by Bella
written by Bella

Issue Description While trying to access an OpenVZ container using the following command: you may encounter this error: Here, 10524 refers to the container ID. Step 1: Check Node Memory Availability First, verify whether the host node is running out of memory: If the system shows sufficient free memory, the issue is likely not at the node level. Step 2: Check Resource Limits (privvmpages) If memory is not the issue, the problem is usually related to OpenVZ memory limits, especially privvmpages. Check current resource usage: This file contains resource usage …

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cPanelLinux BasicsServer TweakingTechnical Articles

ConfigServer Mail Queue on WHM/Cpanel Server

by Bella
written by Bella

The Config Server Mail Queue is an addon feature available with cPanel/WHM which provides with a full-featured interface to the cPanel exim email queues from within WHM. The add-on feature provides with an interface to the cPanel user accounts email configuration without having to log in to their accounts. It is domain-based rather than account-based. Features View, edit and delete email accounts, email forwarders and email filters. View and modify email account quotas Modify email account passwords List only email accounts that are over quota Modify Outgoing Mail Hourly Limits …

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General TopicsLinux BasicsServer TweakingTechnical Articles

Install Wine 1.7.35 in Ubuntu/Debian/Linux Mint

by Bella
written by Bella

Wine makes it possible to run Windows programs alongside any Unix-like operating system, particularly Linux. Wine is an implementation of the Windows Application Programming Interface (API) library, acting as a bridge between the Windows program and Linux. When a Windows program tries to perform a function, Wine will translate that program’s instruction and make it suitable for Linux. The Wine development release 1.7.35 is now available. New features in this release: – Beginnings of support for OpenGL core contexts. – Initial support for glyph placement in DirectWrite. – Some more …

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