ACIM Personal Knowledgebase linux

Analyze AIX and Linux performance

2015-10-05T09:26:16+02:00

Analyze AIX and Linux performance ---------- Usage notes: This nmon tool is NOT OFFICIALLY SUPPORTED. No warrantee is given or implied, and you cannot obtain help with it from IBM. If you have a question on nmon, please go on the Performance Tools Forum site (see Resources) so that others can find and benefit from the answers. To protect your email address from junk mail, you need to create a USER ID first (takes 20 seconds at most).

Enabling PHP 7 in apache

2017-10-19T08:04:50+02:00

Enabling PHP 7 in apache First, disable the php5 module: a2dismod php5 then, enable the php7 module: a2enmod php7.0 Next, reload/restart the Apache service: service apache2 restart

Linux Commands Newbies

2015-10-08T09:39:50+02:00

Linux Commands Newbies ---------- So you are planning to switch from Windows to Linux, or have just switched to Linux? Oops!!! what I am asking! For what else reason would you have been here. From my past experience when I was new to Nux, commands and terminal really scared me, I was worried about the commands, as to what extent I have to remember and memorise them to get myself fully functional with Linux. No doubt online documentation, books, man pages and user community helped me a lot but …

CentOS/RHEL7 Check service

2019-06-18T13:51:49+02:00

CentOS/RHEL7 Check service Previous versions of CentOS/RedHat Linux use init scripts located in the /etc/rc.d/init directory to start and stop services. In CentOS/RHEL 7, these init scripts have been replaced with systemd service units. Service units have a .service extension. Use the systemctl command as follows to list all loaded service units:

Setup a Static IP Address using Nmtui on CentOS 8

2020-03-29T13:25:26+02:00

Setup a Static IP Address using Nmtui on CentOS 8 On the new version of CentOS 8, there are some major changes related the Networking. For the new version CentOS 8, all configuration related networking is managed by the NetworkManager service. And the NetworkManager provided the TUI (Text User Interface) based application that allows you to create and edit the network configuration, its called 'nmtui'.

CertBot Certificate

2017-10-19T17:20:17+02:00

CertBot Certificate Install Since Certbot is packaged for your system, all you'll need to do is apt-get the following packages. First you'll have to follow the instructions here to enable the Jessie backports repo, if you have not already done so.

Migrate Let's Encrypt Certificates (certbot) to a New Server

2020-06-17T22:20:20+02:00

Migrate Let's Encrypt Certificates (certbot) to a New Server Archive SSL certificates First of all, you should find the actual location of the certificates. You can open your nginx or apache configuration to see the location: cat /etc/nginx/sites-enabled/divbyte.com ... ssl_certificate /etc/letsencrypt/live/divbyte.com/fullchain.pem; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/divbyte.com/privkey.pem; # managed by Certbot ...

Let’s Encrypt Certificate renew in CloudFlare

2018-05-09T10:27:32+02:00

Let’s Encrypt Certificate renew in CloudFlare I found another way. I used the following option: --preferred-challenges="dns" The entire command looked like this: certbot certonly --manual -d theos-blog.com -d infosec.theos-blog.com --preferred-challenges="dns"

Change the Default Kernel Version Permanently on CentOS 7

2021-05-13T21:37:33+02:00

Change the Default Kernel Version Permanently on CentOS 7 First, list all available kernel images added to GRUB2 by running the following command. $ grep '^menuentry' /boot/grub2/grub.cfg Identify the GRUB menu entry for the kernel that you want to set as default. Each menu entry is assigned by GRUB2 a numeric value starting from 0 in an increasing order. That is, the first menu entry assigned 0, the second entry assigned 1, etc. For example, the menu entry value for the kernel 3.10.0-327…

Remove Old Kernels on CentOS

2016-03-25T06:03:40+02:00

Remove Old Kernels on CentOS This is quick guide howto delete/remove/clean old kernels on Fedora, CentOS, Red Hat (RHEL). I use here two kernel as example, if you want to keep other more or less, then adjust amount of installed kernels as you wish. Normally reason why you maybe want remove kernels is limited disk space, example on VPS servers and laptop. This is very easy task, you need yum-utils package.

Clear RAM Cache and Swap in Linux

2016-11-29T10:27:23+02:00

Clear RAM Cache and Swap in Linux Like any other operating system, GNU/Linux has implemented a memory management efficiently and even more than that. But if any process is eating away your memory and you want to clear it, Linux provides a way to flush or clear ram cache.

Cron and Crontab

2016-02-17T15:25:27+02:00

Cron and Crontab ---------- An experienced Linux sysadmin knows the importance of running the routine maintenance jobs in the background automatically. Linux Cron utility is an effective way to schedule a routine background job at a specific time and/or day on an on-going basis.

Disable IPV6

2022-09-19T10:07:27+02:00

Disable IPV6 You guessed it, we’re going to be working with the command line. I’ll show you how to disable IPv6 on Red Hat- and Debian-based distributions. Here’s how to disable the protocol on a Red Hat-based system: Open a terminal window.

DNS timout problem

2016-03-30T11:26:53+02:00

DNS timout problem This tip shows you how to improve DNS lookups by using multiple nameservers. This is useful if you've ever had your primary DNS server become unreachable for any reason. Nameservers are listed in /etc/resolv.conf , one per line.

Dokuwiki code in line

2016-03-30T10:16:38+02:00

Dokuwiki code in line You probably want to use here is code. This formats it in monospace ('') and prevents any interpretion of possible wiki markup (%%).

Dokuwiki Color Plugin

2016-05-11T15:53:28+02:00

Dokuwiki Color Plugin ---- plugin ---- description: Opportunity to write colored text in DokuWiki. author : Christopher Smith email : chris@jalakai.co.uk type : Syntax lastupdate : 2008-02-06 compatible : 2009-12-25, 2010-11-07, 2011-05-25, 2012-01-25, 2014-05-05, 2014-09-29d, Adora Belle, Weatherwax, Binky, Ponder Stibbons, Detritus depends : conflicts : similar : fontcolor tags : typography, highlight

Dokuwiki SideBar

2017-03-28T10:52:32+02:00

Dokuwiki SideBar Installation In dokuwiki administration page go to --> Extension manager --> Search and install In Search Extensions filed enter : indexmenu and install extension IndexMenu Plugin In Search Extensions filed enter : sidebar and install extension

Dokuwiki Statistics

2015-10-06T15:49:32+02:00

Dokuwiki Statistics ---- plugin ---- description: Log and analyze access statistics author : Andreas Gohr email : andi@splitbrain.org type : admin, action lastupdate : 2015-04-16 compatible : Hrun, Ponder Stibbons, Binky, Weatherwax depends : conflicts : similar : tags : statistics, logging, mysql

Dokuwiki Note Plugin

2016-06-13T14:20:16+02:00

Dokuwiki Note Plugin ---- plugin ---- description: This plugin allows you to create nice “notes” like this in your DokuWiki pages author : Olivier Cortes et. al. + Aurélien Bompard email : aurelien@bompard.org type : syntax lastupdate : 2009-06-15 compatible : 2009-02-14, Lemming, Anteater, Rincewind, Angua, Adora Belle, Weatherwax, Binky, Ponder Stibbons, Hrun, Detritus depends : conflicts : similar : bootswrapper, box, wrap tags : boxes, icons, toolbar

Extend LVM Partition

2021-06-03T11:20:03+02:00

Extend LVM Partition Resizing the file system size is an important task of Linux admin’s profile. In Linux , LVM(Logical Volume Manager) provides the facility to increase and reduce the file system size. In this tutorial we will discuss the practical examples of lvextend and will learn how to extend LVM partition on the fly using lvextend command.

EXtplorer: online file manager

2016-01-11T12:33:06+02:00

EXtplorer: online file manager For many, cloud computing means being able to access your data and software from anywhere you happen to be through the Internet. I've written several times in this column that cloud computing is great... but only as long as it happens in your cloud, that is in (Free!) software environments that you control and that you can move wherever you want. I already explained, in a previous post, how to put in such a personal cloud your bookmarks. This time, I'll show you o…

GPT PMBR size mismatch

2021-08-10T16:57:25+02:00

GPT PMBR size mismatch Fdisk used to not work at all on gpt partitioned drives, it just reported that drive was gpt partitioned. Better to use parted, gparted or gdisk. Gdisk has been the command line tool for gpt drives. Post these: sudo parted -l

initrd.img - View, Modify and Recreate

2015-10-08T11:35:59+02:00

initrd.img - View, Modify and Recreate ---------- Question: How do I view, modify and recreate the new initrd.img on Ubuntu, Debian, CentOS, Fedora, Red-Hat, Arch Linux, or SUSE distributions? View Content Of initrd.img file ---------- initrd.img is in gzip format.

iPerf to Diagnose Network Speed in Linux

2018-02-12T08:10:45+02:00

iPerf to Diagnose Network Speed in Linux Linux systems administrators and network administrators often find diagnosing network speed degradation complicated, as there are very few tools available to diagnose these issues. iPerf is a command-line tool used in the diagnostics of network speed issues.

IP-tables delete rule

2016-09-19T11:11:41+02:00

IP-tables delete rule You may also use the rule's number (--line-numbers): iptables -L INPUT --line-numbers Example output : Chain INPUT (policy ACCEPT) num target prot opt source destination 1 ACCEPT udp -- anywhere anywhere udp dpt:domain 2 ACCEPT tcp -- anywhere anywhere tcp dpt:domain 3 ACCEPT udp -- anywhere anywhere udp dpt:bootps 4 ACCEPT tcp -- anywhere anywhere tcp dpt…

IP-tables drop exceptions

2016-09-19T11:08:22+02:00

IP-tables drop exceptions Consider an example where your mail server is listening on TCP port 25 (SMTP service). No need to block UDP because no daemon is listening on it. More practical is to probably allow certain hosts/networks/connection states then block any others that don't fit that criteria. So for example if I only want host 10.0.0.1 and 84.42.42.42 to connect to my mail server I can allow that exception and block eveything else, two basic iptables rules can be appended on the INPUT c…

CentOS IPV6 settings

2017-03-13T14:23:19+02:00

CentOS IPV6 settings The configuration below works perfectly : # ifconfig eth0 x.x.x.x/29 # route add defalt gw x.x.x.x # ip addr add dev eth0 XXXX:C810:3001:D00::3/56 # ip -6 route add default XXXX:C810:3001:D00::1 However, I want to keep this configuration after a reboot.

Joomla admin panel shows white blank page after login

2021-02-27T23:03:42+02:00

Joomla admin panel shows white blank page after login Joomla “unintentionally” (I guess) decided to break the Joomla admin panel if you’re running an outdated version reached end of support date. Sorry to disappoint you, but sometimes migration takes time!

Joomla file permissions

2017-11-28T09:28:49+02:00

Joomla file permissions This is very dangerous to have all Joomla! files and directories writable for webserver. If any bug in Joomla! or in some extension, the attacker will be able to remove/change/delete any file through the random exploit (utilizing the bug in PHP code).

KeepAlived on RHEL 6

2015-11-12T13:58:17+02:00

KeepAlived on RHEL 6 ---------- Keepalived is used for IP failover between two servers. It facilities for load balancing and high-availability to Linux based infrastructures. It works on VRRP ( Virtual Router Redundancy Protocol ) protocol. We have running two load balance servers using HAProxy and now we need to implement VRRP between both servers. This tutorial will help you to configure KeepAlived, Use this tutorial to configure HAProxy on both servers.

Add User to Group

2016-02-16T10:05:09+02:00

Add User to Group How can I add a user to a group under Linux operating system using command line options? How to add an existing user into a group in Linux using command line options? You can use the useradd or usermod commands to add a user to a group. The useradd command creates a new user or update default new user information. The usermod command modifies a user account and it is useful to add user to existing groups. There are two types of groups under Linux operating systems:

Linux eBooks

2015-10-06T13:10:27+02:00

Linux eBooks [Introduction to Linux by Machtelt Garrels] [Linux Command Line by William Shotts] [Linux Command Line and Shell Scripting BIBLE]

Setup Local APT Repository Using Installation Media In Debian 8

2016-11-25T13:15:35+02:00

Setup Local APT Repository Using Installation Media In Debian 8 Update your Debian server First of all, log in to your Debian server with root user and update the system using command: apt-get update && apt-get upgrade Then, install the essential packages which are needed to setup local repository using command:

Local YUM repository

2015-10-19T15:10:23+02:00

Local YUM repository ---------- This article is about Setting up a Local yum repository to be used for local network. Local Yum Repository can save internet bandwidth downloading all your packages from the local repository over FAST LAN Network. If You want to use it in your network the best option to be used is using Httpd – Apache so the yum repository will be acessible via web.

Midnight Commander

2015-10-05T11:29:37+02:00

Midnight Commander ---------- Midnight Commander is a console file manager and directory browser. It is a friendly system for many tasks in the terminal window, and the quickest way to copy, move or delete multiple files. MC can also do fast ftp and network file transfers. Other unique features are the ability to browse inside archives and undelete files.

Medidrop installation

2015-10-22T15:20:47+02:00

Medidrop installation ---------- RHEL/CentOS and Fedora ---------- RHEL (+ clones like CentOS) is the preferred platform for running MediaDrop because of its long-term support and high-quality packages. MediaDrop runs on RHEL 5 and 6 as well as any support version of Fedora.

MediaWiki relocate

2015-10-02T13:53:26+02:00

MediaWiki relocate In your LocalSettings.php file, set $wgServer to the domain name of your wiki server, but leave off the URL path component. Set $wgScriptPath to the URL path of the wiki on the server. For example if the wiki is located at , then set these variables as follows:

Mount FTP folder

2015-10-02T14:29:05+02:00

Mount FTP folder Install curlftpfs package : Red Hat,CentOS, Fedora [root@server]# yum install curlftpfs Debian,Ubuntu [root@server]# apt-get install curlftpfs Example mount ftp folder to linux where is : * Unordered List Itemftp server :

Linux mount ISO image

2016-10-26T11:11:46+02:00

Linux mount ISO image You must login as a root user, if not root user then switch to root user using following command: $ su - Create the directory i.e. mount point: # mkdir -p /mnt/disk Use mount command as follows to mount iso file called disk1.iso:

Mount NFS folder

2015-12-10T10:36:55+02:00

Mount NFS folder To mount nfs you must configure nfs server to give access to client . Example mount nfs folder from linux to linux where is : * Unordered server_ip : 192.168.1.100 * user name : samba * login : samba * password samba [root@server]# mount -t nfs server_ip/nfs /mnt/nfs

Mount SAMBA folder

2015-10-02T14:29:28+02:00

Mount SAMBA folder Install cifs package : Red Hat,CentOS, Fedora [root@server]# yum install cifs-utils Debian,Ubuntu [root@server]# apt-get install cifs Example mount samba share folder from linux to linux where is : * Unordered List Itemserver_ip ; 192.168.1.100

MySQL import sql file

2016-08-19T13:59:28+02:00

MySQL import sql file Try: mysql -u username -p database_name < file.sql

MySQL reset root password

2018-06-06T18:09:55+02:00

MySQL reset root password * Stop mysql service systemct stop mysqld * add this line to /etc/my.cnf skip-grant-tables * start mysql service systemct start mysqld * Log in like root (whitout password) mysql -u root * change root password

NFS Server HowTo

2015-10-02T14:29:43+02:00

NFS Server HowTo Start Installation Download and install NFS rpm package using yum # yum -y install nfs-utils rpcbind or Debian # apt-get install nfs-kernel-server nfs-common portmap If you have an earlier Fedora versions # yum -y intall nfs-utils portmap

GeoIP Block NGINX

2023-03-02T13:14:26+02:00

GeoIP Block NGINX Install Nginx modules To make use of the geographical filtering, we must first install the Nginx GeoIP module as well as the GeoIP database containing the mappings between visitors’ IP addresses and their respective countries. To do so, let’s execute:

NMON for Linux

2015-10-05T09:59:23+02:00

NMON for Linux ---------- This systems administrator, tuner, benchmark tool gives you a huge amount of important performance information in one go. It can output the data in two ways On screen (console, telnet, VNC, putty or X Windows) using curses for low CPU impact which is updated once every two seconds. You hit single characters on you keyboard to enable/disable the various sorts of data. You can display the CPU, memory, network, disks (mini graphs or numbers), file systems, NFS, top proc…

Creating a Local Yum Repository Using an ISO Image

2021-05-19T13:39:44+02:00

Creating a Local Yum Repository Using an ISO Image * Transfer the removable storage to the system on which you want to create a local yum repository, and copy the DVD image (V921569-01.iso) to a directory (/media/V921569-01.iso) in a local file system. For transfer file can be used application WinSCP.

Creating a Local Yum Repository Using an ISO Image

2017-01-31T11:18:28+02:00

Creating a Local Yum Repository Using an ISO Image Note The system must have sufficient storage space to host a full Oracle Linux Media Pack DVD image (approximately 3.5 GB for Oracle Linux Release 6 Update 3). To create a local yum repository (for example, if a system does not have Internet access):

Reset the Root Password in Oracle Linux

2018-06-04T08:25:18+02:00

Reset the Root Password in Oracle Linux Ever need to reset the password for Root on an Oracle Linux box? You’ve come to the right place! Here’s how: FYI, I did this tutorial in Oracle Enterprise Linux (OEL) 7, but this is a distro based on Red Hat Enterprise Linux (RHEL), so these instructions should more-or-less work on any similar distro to OEL/RHEL, give or take a few versions. Let’s get started:

OEL/Red Hat OS version

2016-10-26T10:54:07+02:00

OEL/Red Hat OS version RedHat (RHEL) provides the file /etc/redhat-release, installed by the package redhat-release. Oracle Linux (OL) adds its own file /etc/enterprise-release, installed by enterprise-release, OL 6 adds /etc/oracle-release, installed by oraclelinux-release. As of OL 6, /etc/redhat-release retains the RHEL content.

OwnCloud slogan footer text

2016-06-20T10:31:53+02:00

OwnCloud slogan footer text Here is some indication how to customize the footer text “ownCloud – web services under your control”, title, etc. This can be achieved easily editing the following file under your ownCloud root folder : /lib/private/defaults.php

PostgreSQL Overview

2017-03-28T23:22:09+02:00

PostgreSQL Overview PostgreSQL has extensive and good help that should be the first source of information regarding this database product. This page outlines main differences to generic PostgreSQL installation used by Debian. Installation Required packages: postgresql postgresql-client

Backup PostgreSQL Databases

2017-03-28T23:28:06+02:00

Backup PostgreSQL Databases What is PostgreSQL? PostgreSQL is a modern database management system. It is frequently used to store and manipulate information related to websites and applications. As with any kind of valuable data, it is important to implement a backup scheme to protect against data loss. This guide will cover some practical ways that you can backup your PostgreSQL data.

PostgreSQL Relational Databases

2015-10-06T10:45:39+02:00

PostgreSQL Relational Databases ---------- The PostgreSQLExternal Link relational database system is a fast, scalable, and stadards-compliant open source database platform. This guide will help you install and configure PostgreSQL on Fedora 14. We assume you've followed the steps detailed in our getting started guide, and that you're logged into your Linode VPS as root via SSH.

PowerDNS On CentOS

2015-11-09T09:27:34+02:00

PowerDNS On CentOS ---------- Scenario: ---------- Operating system: CentOS 6.5 minimal server IP Address: 192.168.1.150/24 Hostname: server.unixmen.local Update your system: ---------- First of all, update your system: Note: The commands in this article is being performed by Root user.

QNAP and Cron

2016-01-20T17:16:52+02:00

QNAP and Cron QNAP’s Cron isn’t the best they’ve accomplished… It’s buggy, and you have to know what you’re doing in order to get it working, because it’s not working as it does on a regular Debian server like Ubuntu i.e. Some examples that confused us

QNAP Mysql restart service

2016-05-09T13:08:33+02:00

QNAP Mysql restart service If you can use ssh/telnet login, please help to check belows * run command [~] # /etc/init.d/mysqld.sh restart Shutting down MySQL160509 11:31:51 mysqld_safe mysqld from pid file /var/lock/qmysql.pid ended SUCCESS! 160509 11:31:52 mysqld_safe Logging to '/usr/local/mysql/var/QNAP451-HOME.err'. 160509 11:31:52 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var SUCCESS! [~] #

Raspberry Pi 2+ Raspbian Jessie

2016-04-21T15:51:59+02:00

Raspberry Pi 2+ Raspbian Jessie Download from website Raspbian full image of Raspbin Jessie Full ZIP or lite verison Lite Version ZIP. Unzip downloaded zip file and install image with Win32DiskImager tutorial. Next step is installation xbmc on Raspbian Add these lines to “” /etc/apt/sources.list

Remove SSL certificate passphrase

2016-05-11T15:51:47+02:00

Remove SSL certificate passphrase A lot of people ask how they can remove the passphrase requirements from a private key so that Apache can be (re)started without the need to re-enter the key's passphrase. Now that you have been warned about the risks, we can continue onto the options

Repo EPEL for RHEL,CentOS

2019-04-25T14:12:21+02:00

Repo EPEL for RHEL,CentOS EPEL for RHEL 6 With less time to live on the edge in Fedora-land these days I went looking for less excitement by way of Red Hat Enterprise Linux 6 for my Dell XPS M1330 laptop. I was motivated to take a step back from Fedora 14 by a couple of things. The first was the ongoing unresolved kernel bug surrounding wake-ups. The second was hoping for a more reliable suspend and resume experience which has become more annoying the more time I spend on a MacBook. To its…

Rsync examples

2015-10-05T13:13:01+02:00

Rsync examples rsync is used to perform the backup operation in UNIX / Linux. rsync utility is used to synchronize the files and directories from one location to another in an effective way. Backup location could be on local server or on remote server.

Linux Screen

2015-10-05T14:17:16+02:00

Linux Screen Linux Screen allows you to: Use multiple shell windows from a single SSH session. Keep a shell active even through network disruptions. Disconnect and re-connect to a shell sessions from multiple locations. Run a long running process without maintaining an active shell session. If this sounds like stuff you can use, check our our 2 minute quick-start video below or read on for more details on how to use screen.

13 Apache Web Server Security and Hardening Tips

2017-03-29T15:10:09+02:00

13 Apache Web Server Security and Hardening Tips Here in this tutorial, I’ll cover some main tips to secure your web server. Before you apply these changes in your web server, you should have some basics of the Apache server. * Document root Directory: /

Securing Linux

2015-10-06T08:18:59+02:00

Securing Linux Securing your Linux server is important to protect your data, intellectual property, and time, from the hands of crackers (hackers). The system administrator is responsible for security Linux box. In this first part of a Linux server security series, I will provide 20 hardening tips for default installation of Linux system.

Secure web server

2016-05-04T12:19:54+02:00

Secure web server First of all, check security your web server on this page SSL Server Test After that you can start fix your security problems. Disabling SSL 3.0 in mod_ssl To mitigate this vulnerability as it affects httpd using mod_ssl, set the SSLProtocol directive as follows in /etc/httpd/conf.d/ssl.conf:

Sendmail permmisions

2018-01-30T09:58:03+02:00

Sendmail permmisions Standard installation of sendmail-8.12+ requires to install sendmail binary as set group id. (/usr/sbin/sendmail -> ... -> /usr/lib/sm.bin/sendmail in you case) -rwxr-sr-x 1 root smmsp ... In case of your softlinks chain try:

GRUB2 on mdadm software Raid in Debian

2017-12-14T09:47:08+02:00

GRUB2 on mdadm software Raid in Debian Principle: If you look at the result of the command df -h and you are using the mdmadm software RAID 1 then you can only see the /dev/mdx partitions. eg. Filesystem Size Used Avail Use% Mounted on /dev/md2 1.8T 524G 1.2T 31% / udev 10M 0 10M 0% /dev tmpfs 3.1G 288K 3.1G 1% /run tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 9.3G 0 9.3G 0% /run/shm /dev/md1 496M 77M 394M …

Create a .pfx/.p12 certificate file using OpenSSL

2019-09-30T10:35:42+02:00

Create a .pfx/.p12 certificate file using OpenSSL The PKCS#12 or PFX format is a binary format for storing the server certificate, any intermediate certificates, and the private key into a single encryptable file. PFX files are usually found with the extensions .pfx and .p12. PFX files are typically used on Windows machines to import and export certificates and private keys.

SSL Certificate / Export your private key

2016-05-04T12:08:14+02:00

SSL Certificate / Export your private key Follow the steps below to export your Certificate and Private Key. * Start the Microsoft Management Console > Run mmc.exe * Click the 'Console' menu and then click 'Add/Remove Snap-in'. * Click the 'Add' button and then choose the 'certificates' snap-in and click on 'Add'.

OCSP Stapling on Apache and Nginx

2016-06-17T11:16:03+02:00

OCSP Stapling on Apache and Nginx Introduction OCSP stapling is a TLS/SSL extension which aims to improve the performance of SSL negotiation while maintaining visitor privacy. Before going ahead with the configuration, a short brief on how certificate revocation works. This article uses free certificates issued by StartSSL to demonstrate.

SVN on CentOS

2015-10-02T14:30:04+02:00

SVN on CentOS Start Installation Change root user su - ## OR ## sudo -i Install needed packages (mod_dav_svn and subversion) yum install mod_dav_svn subversion Note: If you don’t have Apache installed already, this command installs it also. [

Use Swap File on Linux

2021-08-17T11:31:01+02:00

Use Swap File on Linux Last updated August 29, 2019 By Abhishek Prakash 53 Comments This tutorial discusses the concept of swap file in Linux, why it is used and its advantages over the traditional swap partition. You’ll learn how to create swap file or resize it.

Use /proc/sys and sysctl to modify and set kernel runtime parameters

2016-11-29T10:46:22+02:00

Use /proc/sys and sysctl to modify and set kernel runtime parameters Note: This was a RHCE 7 exam objective until June 2016. It is now removed from the curriculum. Presentation When you want to improve the performance or the characteristics of your server, you need to set the kernel runtime parameters.

Terminal Command Reference

2015-10-02T12:03:19+02:00

Terminal Command Reference System Info Command Definition date Show the current date and time cal Show this month's calendar uptime how current uptime w Display who is online whoami

Boot script Debian

2015-10-19T15:09:40+02:00

Boot script Debian ---------- Debian uses a Sys-V like init system for executing commands when the system runlevel changes - for example at bootup and shutdown time. If you wish to add a new service to start when the machine boots you should add the necessary script to the directory

Tiny File Manager (PHP)

2023-01-14T01:29:59+02:00

Tiny File Manager (PHP) External Link

Tmux

2017-10-17T11:19:56+02:00

Tmux A few times a year, I find something that transforms or enhances my development environment. Examples in the past few years are: Github , vim, and zsh (more specifically, on-my-zsh .) Sometime in the last year or so, I started using another development transformer: Tmux . What is tmux? According to its site:

Two default gateways on Linux

2021-04-08T15:17:51+02:00

Two default gateways on Linux Two default gateways on CentOS You have two or more network cards (interfaces) in one Linux system and each of these interfaces has its own default gateway. By default, you can only have one default gateway on a system.

VLAN trunk (Debian)

2015-10-13T10:32:25+02:00

VLAN trunk (Debian) ---------- Objective ---------- To configure an Ethernet interface as an IEEE 802.1Q VLAN trunk on a Debian-based distribution. Background ---------- See Configure an Ethernet interface as a VLAN trunk. Scenario ----------

MediaWiki on CentOS

2015-10-02T14:28:42+02:00

MediaWiki on CentOS Introduction MediaWiki is a free and open-source wiki application written in PHP. It was originally created for WikiPedia, but it now allows everyone to create their own wiki sites. Currently thousands of websites are running MediaWiki, including Wikipedia, Wiktionary and Wikimedia Commons. MediaWiki's homepage is located at

Install Wiki.js with Node.js, PostgreSQL, and Nginx on Ubuntu

2022-08-23T11:48:46+02:00

Install Wiki.js with Node.js, PostgreSQL, and Nginx on Ubuntu Source Link Introduction Wiki.js is an open-source, lightweight, and powerful wiki software released under the AGPL-v3 license. Its modern and extensible user interface makes it suitable for all kinds of documents, especially software documents. Wiki.js also provides a

OwnCloud on CentOS

2016-05-09T13:21:11+02:00

OwnCloud on CentOS Add repository and install manually CentOS_6 owncloud-files-9.0.2-1 Run the following shell commands as root to trust the repository. rpm --import https://download.owncloud.org/download/repositories/stable/CentOS_6/repodata/repomd.xml.key

linux:wordpress_migrate_fix

2016-10-10T16:53:48+02:00

Update WordPress Domain with Database Access To update an improperly configured WordPress domain or a secure web address for your WordPress domain via your database, follow the steps below: Log into your cPanel. Check the wp-config.php file in the appropriate directory to get the WordPress database name. In the Files section, click the File Manager icon. Select the wp-config.php file in the base directory for your blog. Right-click on the file and select View.

Secure Wordpress

2018-03-28T05:53:23+02:00

Secure Wordpress To Force SSL Logins and SSL Admin Access The constant FORCE_SSL_ADMIN can be set to true in the wp-config.php file to force all logins and all admin sessions to happen over SSL. Example define('FORCE_SSL_ADMIN', true); Protecting your login page cannot be accomplished by any one specific technique, but there are certainly steps you can take to make any attacks far less likely to succeed.

Xrdp on Ubuntu 20.04

2021-11-15T12:05:26+02:00

Xrdp on Ubuntu 20.04 Xrdp is an open-source equivalent of Microsoft’s Remote Desktop Protocol (RDP). With xrdp installed on a Linux system, users can remotely access the Linux desktop using an RDP client as we shall demonstrate later in this article. It’s completely free to download and use.

Zentyal - ActiveSync

2016-04-30T02:33:36+02:00

Zentyal - ActiveSync From version 3.4 on, Zentyal can provide an ActiveSync gateway on top of its OpenChange module. There is one package available which provide this functionality, sogo-activesync. You will need to have zentyal-openchange installed and enabled.

Zimbra problems with 7025 port

2016-04-27T10:52:42+02:00

Zimbra problems with 7025 port pfSense - Zimbra Server behind NAT * Enable NAT for port 7025 * To lookup lmtp addresses natively instead of by DNS, simply modify the following localconfig values on all mta's zmlocalconfig -e postfix_lmtp_host_lookup=native

zip,tar,tar.gz and tar.bz2

2015-10-05T10:18:23+02:00

zip,tar,tar.gz and tar.bz2 ---------- Data compression has been extremely useful to us over the years. Whether its a zip file containing images to be sent in a mail or a compressed data backup stored on a server, we use data compression to save valuable hard drive space or to make the downloading of files easier. There are compression formats out there which allow us to sometimes compress our data by 60% or more. I’ll run you through using some of these formats to compress and decompress files…