How to display the network usage by processes like top for CPU/mem on Linux? The nethogs tool is my favorite: nethogs – Net top tool grouping bandwidth per process
Tag: Network
How to exclude certain repositories in yum?
Posted onThis tutorial introduces how to exclude certain repositories in yum. Excluding certain repositories is needed usually. One example may be when you have several repositories that have the same package and you only want the one from a certain repository. For my situation, I choose to exclude the google-chrome and other repositories from Google when
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Where are the Linux routing table entries stored on disk?
Posted onI know the routing tables on Linux is in memory after being set. However, where are the routing table entries stored on disk? I mean where are the routing table is persistently stored so that the routing table can be reloaded like the iptables (under /etc/sysconfig/iptables on Fedora/RHEL/CentOS Linuxes). If the system uses the /etc/rc.d/init.d/network
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Are there good free CDNs on the Web
Posted onAre there some good free CDNs on the Web? There are some free CDNs in the Web. Cloudflare: https://www.cloudflare.com CloudFlare protects and accelerates any website online. Once your website is a part of the CloudFlare community, its web traffic is routed through our intelligent global network. We automatically optimize the delivery of your web pages
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Adding Custom Buttons to the WordPress HTML Editor
Posted onAs a WordPress user, you may have noticed that the default HTML editor lacks some of the features that you need for your content. Fortunately, you can add custom buttons to the WordPress HTML editor to make your content creation experience more efficient and productive. In this post, we will explore how to add custom
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How to test the connections between Linux hosts/servers?
Posted onHow to easily and quickly test the connection between two nodes on Linux? This should be specific to protocol and port. We can use nc (netcat) to test the connection between two servers. For example, to test whether TCP port 1048 can be used on the server (IP 10.0.3.48 as an example) side: On the server: $
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Where Does Evolution Save Its Data and Configuration Files on Linux?
Posted onEvolution is a great personal information management tool that provides Email, address book and calendar tools. Evolution provides many enterprise friendly feature such as native support to Microsoft Exchange connectivity for Emails, address books and calendars. Evolution uses various ways including plain files and dconf configuration systems. This post will give an introduction to the
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How to Export an NFSv4 Server to External Networks
Posted onWe ever discussed fixing ports used by NFSv3 so that it can be easily exported to external networks. For NFSv4.1 or higher, things are much easier. The ports for mountd, statd, and lockd are not required in a pure NFSv4 environment. We have less ports to control or allow for connections. Only port 111 and
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NET Core 2.1 Release: Feature To Expect in 2018
Posted onWhat surprises are awaiting the tech world with .NET Core 2.1 Release in 2018? Technology is one of the most dynamic spheres these days. Every single year you will find a new version of an existing software and .NET Core is not an exception. The intentions of these upgradation is to make online activities seamless,
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QEMU/KVM Network Mechanisms
Posted onIntroduction As we know, network subsystems are important in computer systems since they are I/O systems and need to be optimized with many algorithms and skills. This article will introduce how QEMU/KVM [2] network part works. In order to put everything simple and easy to understand, we will begin with several examples and then understand
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How to Install Paravirtualized CentOS 7 DomU on Xen
Posted onThis post introduces how to install a paravirtualized CentOS 7 DomU on Xen. The very common way of installing DomU does not work for CentOS 7. A little trick to set the repository and the network used by the VM should be used by adding a setting strings to the “extra=” field for this VM.
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How to Set the Static IP Address Using CLI in Fedora/CentOS Linux
Posted onHow to set the static IP address for CentOS 7/Fedora 22+ is introduced in this post. Here, we assume the Linux is using NetworkManager to manage the network. All steps are done as root. Find the interface you want to set the address Command ifconfig -a lists all interfaces. Find the interface name to set,
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Notes for Beginners of Software Development on Linux
Posted onLinux is a great platform for software development targeting servers or backends. In general, working on Linux is very productive. The problem that beginners on Linux face is the the learning curve is steep at the beginning. But believe me, after you get through the initial green steep learning step as in the figure below
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How to Upload Large Files to Amazon S3 with AWS CLI
Posted onAmazon S3 is a widely used public cloud storage system. S3 allows an object/file to be up to 5TB which is enough for most applications. The AWS Management Console provides a Web-based interface for users to upload and manage files in S3 buckets. However, uploading a large files that is 100s of GB is not
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How to Configure the Latest Version of Flash on Firefox for Linux: by the Fresh Player Plugin
Posted onAs you may know, Adobe stopped supporting the NPAPI version of Flash on Linux and the latest NPAPI version of Flash player at version 11.2 released back in 2012 will only receive security fixes. Even the security fixes to the 11.2 version of the Flash Plugin your Firefox is using will end on May 4,
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How to Configure Scanner in an HP All-In-One Printer on Linux?
Posted onThe hplip packages contains all the tools you need to set up the HP scanner. For scanning, you may use the sane and xsane tools. The tricky part to enable the scanner is carefully choose which driver to use from the hplip package. If you choose a non-suitable driver, only the printer will work and
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Fetching RSS Feed and Outputing Feed Items as HTML in PHP
Posted onIt is useful to show the feed items directly on the webpage as HTML content. In this ost, we will show one single PHP function that fetches an RSS feed and outputs the feed items as HTML elements in the web page. One example to fetch an RSS feed and output the itmes as HTML
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Free VPNs for iPhone Users: OpenVPN + Ovpn Spider
Posted onVPNs are useful for testing viewing webpages from a remote location or visiting blocked websites. In this post, I will introduce a method for finding and using free VPNs on iPhone. Note that the VPNs are free and the providers are not identified. Hence, only use this method for visiting public webpages or keeping visiting
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iPhone Connecting to Internet Using Windows PC’s Network through USB Cable
Posted onNote that this was only tested on certain combinations like this (Windows 7 with iOS 8), this (Windows 7 with iOS 7), this and this (Windows 7 with iOS 9.3.2 (iphone 6s)). Windows 7 seems a possible Windows OS that can work. Recently, I tested it on Windows 8 and iOS 9. Unfortunately, it did
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Lazy Linux Admins Going to Server Rooms Less: Forced Reboot, Auto Reboot after Kernel Panic and Email Notification after Reboot
Posted onHaving to go the the server room to reset servers is the most headache thing for admins managing a cluster of Linux servers in a remote site. Either you can ping the server but can not ssh to it, or you even can not ping it. There are various reasons that may cause a Linux
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