Linux System Administration

XWiki on Ubuntu 16.04 LTS with Nginx Reverse Proxy

February 26, 2018 Andy 0

Install XWiki and all dependant programs on a 4 GB cloud server. This means: 1) Java 2) Tomcat 3) MySQL/MariaDB 4) XWiki 5) Nginx Here we use Nginx as a reverse proxy to firstly redirect all HTTP to HTTPS and then forward all requests on port 80/443 to port 8080 (tomcat) on the localhost. Here I use LetsEncrytp for my SSL certificates. Before we begin… Setup DNS wiki.dummydomains.org.uk ——> 134.213.27.60 Prepare the Server Update Update and reboot the server. Enable the firewall Install Oracle Java This is a requirement before installing Tomcat or XWiki. At the time of writing, Java 8.x is […]

How to Safely Reduce the Size of a Logical Volume

July 3, 2017 Andy 0

Do not attempt to shrink a volume if the partition is mounted! Always unmount first! If it is the root volume you need to reduce in size, use a Live DVD/USB instead. You should also take a backup first too 😉 So here we can see I have one Physical Volume, /dev/md0, attached to my one volume group, RAIDVG. [andy@home-pc ~]$ sudo pvs PV VG Fmt Attr PSize PFree /dev/md0 RAIDVG lvm2 a– 1.91t 0 We can also see there is zero space left on the volume group. You can use sudo pvdisplay to see a more detailed output. As […]

openssl

February 10, 2014 Andy 0

The OpenSSL project is an open-source general purpose cryptography library that implements the SSL and TLS protocols. Configuration File The configuration file for OpenSSL is openssl.cnf. The location of which will probably vary across Linux distributions. On Red Hat systems the configuration file is as shown below. /etc/pki/tls/openssl.cnf You can use this file to define certain default values. For example, editing the dir variable sets the default directory for saving your certificates. You will need to first create the directory if you change this value. dir = /certs/ssl/ca Some additional variables I like to set are as shown below. You […]

tar

February 10, 2014 Andy 0

Compressed Archive Resources How do I Compress a Whole Linux or UNIX Directory? http://www.cyberciti.biz/faq/how-do-i-compress-a-whole-linux-or-unix-directory/

nmap

February 10, 2014 Andy 0

nmap -sS 1.2.3.4 nmap -PN 1.2.3.4 -p 22 The -PN option treats the host as if it is online and will not perform any host discovery.

curl

February 10, 2014 Andy 0

curl -I http://pikedom.com http://curl.haxx.se/docs/httpscripting.html https://httpkit.com/resources/HTTP-from-the-Command-Line/ http://www.yilmazhuseyin.com/blog/dev/curl-tutorial-examples-usage/

locate

February 10, 2014 Andy 0

The locate command can be used to find files by name. As usual you can find out everything you could possibly want to know about the the locate command in the manual pages. man locate Essentially, locate, at set periods runs a cron job indexing each file name into a database. The locate command simply searches the database for a given file name. If you know the file you are searching for is new, you might first need to update the locate database with updatedb. In its simplest form, to find a file called myfile.txt, run. locate myfile.txt

find

February 10, 2014 Andy 0

You can use the find command to search a system for files or directories. The find command can be quite resource intensive as it trawls recursively through your file structure. Often a more suitable command is locate. See here for more information about the locate command. As usual you should head to the manual pages to find out more. man find In its simplest form, you can use the find command like this. find / -name myfile.txt The ‘/’ is the directory to start recursively searching from. We use the ‘-name’ command line option to indicate we are searching on […]

Create a Self-Signed Certificate for Apache

December 7, 2013 Andy 0

Contained within an SSL certificate is information that pertains to you and your secured domain. Lets imaging that you have a web hosting company called Spider and the details for which are shown below. Country Name (2 letter code): UK State or Province Name (full name): Surrey Location Name (city): Camberley Organisation Name (company): Spider Web Hosting Organisation Unit Name (section): IT Support Common Name (your domain name): spiderwebhosting.com Email Address (): webmaster@spiderwebhosting.com A challenge password: leave blank An optional company name: leave blank Generate a Private Key and Certificate Signing Request Here we generate a Certificate Signing Request and […]

Gentoo: Temporarily Configure Networking

December 7, 2013 Andy 0

This can be useful if your working from a LiveCD or testing the network. Note, “temporary” means it will not survive a reboot! To configure networking, adjust the below command for your own environment. ifconfig eth0 192.168.1.109 broadcast 192.168.1.255 netmask 255.255.255.0 up route add default gw 192.168.1.254 The above commands assign the static IP address of 192.168.1.109 to the eth0 interface and defines the default gateway as 192.168.1.254. You might also need to add some nameservers to your /etc/resolv.conf configuration file. nameserver 192.168.1.254 nameserver 1.2.3.4 Again, this configuration will be lost after a reboot. To permanently create these rules, use […]