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Data Integration and Virtualisation
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Data Integration
With extensive experience in Oracle Data Integrator and the Cloudera Big Data Stack we've got all of your integration needs covered, whatever the size of your data.
Support
With hands on experience with systems of all sizes and workloads, we'll look after your data and analytics estate and keep things running smoothly 24 hours a day.
Virtualization
Virtualization is used to abstract applications from the servers that run them. In today's world it's a must to be fast paced and able to react to changes in demand. We're able to help you deploy and configure Hardware or Container virtualisation platforms.
Latest Blog Posts
Docker Compose File For Watchtower
Watchtower is a docker container that will update the version of other running containers. You can cha
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Bash Script To Get AWS EC2 Tag Value For A Running Instance
Here is a Bash script for getting a tag value from within a running EC2 Instance. For more information
Read MoreParallel Replication In MariaDB
Parallel replication has been available in MariaDB since Version 10.0.5, however requires at least ver
Read MoreInstall AWS CodeDeploy Agent on Linux
AWS CodeDeploy Agent is the agent that runs deploy jobs on EC2 instances. Before a CodeDeploy job will
Read MoreScript To Install AWS CodeDeploy Agent on Linux
Here is the script for installing the AWS CodeDeploy agent on Ubuntu. See the full description here. F
Read MoreStorj Storage Node Docker-Compose file
Storj V3 is now in BETA and recruiting Storage Node operators. Since V3 of Storj, Docker is used exclu
Read MoreApache Traffic Server (ATS) Returning 403 For DELETE HTTP Requests
Here is a quick snippet which solves an issue I ran into today. I’ve recently set up Apache Traf
Read MoreMysql Data Types and Sizes for String/ Text
MySQL or MariaDB has several data types for handling text-based characters. There are several data typ
Read MoreDocker Compose yml for Gitlab and Gitlab Runner
Create a new directory and save the above file inside it as docker-compose.yml. You’ll need to r
Read MoreDockerfile for Apache Traffic Server (ATS)
Apache Traffic Server is an enterprise-grade proxy and caching server initially developed by Yahoo, th
Read MoreInstall Docker-Compose
Docker-compose is a utility used to create and manage multiple Docker containers together to form a se
Read MoreHow to test your Docker install is working
Testing Docker, thankfully is one of the easiest things you can do – something you’d expec
Read MoreDocker Compose yml for WordPress
The below docker-compose yml file will create two Docker containers for running WordPress; a MySQL dat
Read Morerclone Systemd startup mount script
Rclone is a command line utility used for reading and writing to almost any type of cloud or remote st
Read Moregitignore file for Go Projects
This is a gitignore file for a Go project to ensure temporary files and build files are not added to g
Read MoreList of Bank Holidays For England in SQL Format
First off let’s create a table to store the bank holiday values. You may need to adjust this sli
Read MoreMySQL/ MariaDB Error Code: 1329. No data – zero rows fetched, selected, or processed
The above error can occur when calling a cursor results in no rows, or no more rows if called in a loo
Read MoreHow to exit from a MySQL/ MariaDB Stored Procedure/ Function Prematurely
MySQL and MariaDB enable you to define your own error conditions and to report back to the SQL client
Read MoreCockroachDB systemd script
This is a simple systemd script for CockroachDB. It works for single node installations or multiple no
Read Moregitignore file for Eclipse Projects
This is an example of a .gitignore file for an Eclipse project to ensure temporary files, build files
Read MoreHow to change the listening port for PostgreSQL Database
The default TCP port for PostgreSQL is usually 5432, however this can easily be changed in the postgr
Read Moregitignore file for Nodejs Projects
An example gitignore file for Nodejs projects to ensure that local environment variables, build relate
Read Moregitignore file for Netbeans Projects
A gitignore file for most Netbeans projects to keep the build and local configuration files out of you
Read More.gitignore OS generated files
A gitignore file to ignore standard OS (usually Windows) generated files. Often you’d use this i
Read MoreView Table Sizes in MySQL/ MariaDB Databases
MySQL and MariaDB present a bunch of queryable objects that give you all sorts of insights into what&#
Read MoreMySQL/ MariaDB Table Size
Create a MySQL or MariaDB view to show the size of each table in the database:
Read MoreMySQL/ MariaDB Schema Size
Create a MySQL or MariaDB view to show the aggregated size of each schema in the database:
Read MoreDocker images Filter Options
The below is an excerpt from docker.com listing the –filter options available for docker image
Read MoreDocker ps Filter Options
The below is an excerpt from docker.com listing the –filter options available with docker ps.
Read MoreRemove Docker Container Based On Regex
This simple one-liner will take a regular expression (regex) and remove any Docker containers matching
Read MoreHow to Clear the Slow Query Log on AWS RDS MySQL/ MariaDB
Here is a super simple little tip for clearing the mysql.slow_log in MySQL or MariaDB when running an
Read MoreEXECUTE IMMEDIATE MySQL
Unlike recent versions of Maria DB, MySQL does not currently support the command EXECUTE IMMEDIATE. E
Read MoreRun Multiple Bash Commands In Parallel
Bash, whilst great for simple things, can be tricky to use more advanced programming techniques that a
Read MoreOracle ORA-02287: sequence number not allowed here
I’ve recently hit an issue when trying to include a sequence.nextval in an Oracle database view.
Read MoreOracle View Sequence Test
CREATE SEQUENCE seq_test MINVALUE 1 START WITH 1 INCREMENT BY 1 CACHE 20 / CREATE OR REPLACE FUNCTION
Read MoreExplain Why An Oracle Database Materialized View Does Not Rewrite
Using Oracle Database materialized views for query rewrite, when used in the right way, can really hel
Read MoreMove Proxmox Container to Different Storage (Updated for LXC)
The Proxmox Web GUI does not give us the ability to migrate a container from one storage device to ano
Read MoreReduce Proxmox LXC Backup Size and Time
Proxmox backs up guests byte-for-byte in a compressed archive. Looking at LXC backups specifically, th
Read MoreGitlab Runner Error: sudo: no tty present and no askpass program specified
After issuing the first build on a dynamically created Container I came across the following build err
Read MoreScripted Install of Oracle Java 8 on Ubuntu 16.04
Please see Install Oracle Java In Debian/ Ubuntu using apt-get for more information. apt install -y
Read MoreRename a Proxmox Host
Renaming a Linux server’s hostname is usually a trivial task, and that’s no Different to a
Read MoreOBI formatting grand totals – without XML!
Recently I needed to have some conditionally formated grand total rows in OBI. I remember years ago ha
Read MoreStart/ Stop Container Using The Proxmox Web API in Bash
The Proxmox Web API can perform any actions available in the front end Web. By implementing a REST API
Read MoreGetting Started With Proxmox HTTP API Commands
Proxmox has 2 API access points that can be used to control your Proxmox server and virtual guests. On
Read MoreParse Proxmox Web API authentication ticket and the CSRFPreventionToken in Bash
The Proxmox Web API can perform any actions available in the front end Web. By implementing a REST API
Read MoreVirgin Media Speeds In Nottingham
Somewhat off-topic today, but something that I’ve recorded here to showcase the current state an
Read MoreSimple iptables Rules for Ubuntu/ Debian VPS
The following iptables rules are are a starting point to add basic firewall security to a public facin
Read MoreSetting Memory Resource Limits With LXC
Linux Container (LXC) management is now often dealt with by LXD, the Canonical lead project bui
Read MoreSetting CPU Resource Limits With LXC
Linux Container (LXC) management is now often dealt with by LXD, the Canonical lead project built on t
Read MoreAdd systemd Startup Script For CouchDB
Currently, version 2.0 of CouchDB doesn’t come with any form of startup script. I’m sure t
Read MoreBasic IPTable Rules
Here are some basic IPTable rules to enable essential connectivity from the host. Outbound connectiv
Read MoreSkip Certificate Checks with Wget
This is a reminder for myself more than anything else, on how to get wget to download SSL internet con
Read MoreApt-get error: E: The method driver /usr/lib/apt/methods/https could not be found
I’ve been getting the following error when using apt-get update with Debian Wheezy recently. E
Read MoreOracle Database Interval Partition Set Up Script
This script is used to set up the test table for the following blog posts: Oracle Database INTERVAL Pa
Read MoreManually downloading Java For Use With Webupd8’s apt-get Package
Oracle Java is one of the biggest problems in life. That’s just a fact. Half of it is the fact t
Read MoreCreate a Simple Cassandra Cluster With 3 Nodes
Apache Cassandra™ is a massively scalable open source NoSQL database. Cassandra is built from day 1
Read MoreInstall DataStax Cassandra 3 on Debain/ Ubuntu
The following process will install the DataStax distribution of Cassandra on any Debian based system,
Read MoreDataStax Cassandra 3.2 Bash Install Script
The below script installs the DataStax distribution of Cassandra 3.2.x and the latest Oracle Java 8 o
Read MoreAutomated Bash MongoDB 3.2 Install Script for Debian/ Ubuntu
MongoDB is one of the leading noSQL breeds of database that’s been growing in popularity in rece
Read MoreMongoDB 3.2 Bash Install Script
The below script installs MongoDB 3.2.x on Debian. Copy and paste the script into a file called insta
Read MoreUse DD to Quickly Benchmark Your CPU
Let me start by saying… this is a quick and dirty method and shouldn’t be used for precise
Read MoreInstall Oracle Java In Debian/ Ubuntu using apt-get
Oracle Java, due to Oracle’s license conditions, it quite a pain to install. The problem is that
Read MoreTrain SpamAssassin Spam Email Message Detection in Zentyal
SpamAssassin does a great job at identifying SPAM emails and is probably one of the most popular in it
Read MoreGlusterFS Error cannot open /dev/fuse
After installing glusterfs-client on my Debian server I received the below error when trying to moun
Read MoreGlusterFS Error volume add-brick: failed: Pre Validation failed on BRICK is already part of a volume
I received the below error today after I tried to add a ‘new’ brick to a GlusterFS volume
Read MoreGlusterFS Mount failed. Please check the log file for more details.
You may get the following error when trying to mount a GlusterFS volume locally. The error displayed g
Read MoreChange Listening Port of MySQL or MariaDB Server
The MySQL and MariaDB server both use a file called my.cnf for parameters that are used to configure
Read MoreReset The root MYSQL/ MariaDB Password
If you’ve lost or forgotten the root user password on a MySQL or MariaDB server you’ll wan
Read MorePersistent Ceph Mount Point
Once you’ve got a Ceph cluster up and running you’re going to want to mount it somewhere.
Read MoreSmall Scale Ceph Replicated Storage
I’ve written a few posts about Ceph, how it works and how it’s set up and it mostly revolv
Read MoreMount A loop Device In An OpenVZ Container
You can pass a loop device through to an OpenVZ container with the vzctl command. You’ll need
Read MoreCeph Minimal Resource ceph.conf
The below file content should be added to your ceph.conf file to reduce the resource footprint for l
Read MoreUse A File As A Linux Block Device
Just like when creating a SWAP file, you can create a file on a disk and present it as a block device.
Read Moreqcow2 image format and cluster_size
There are various things you need to consider when creating a virtual disk for a virtual machine, such
Read Moreqcow2 Physical Size With Different preallocation Settings
The qcow2 image format is the defacto image format for KVM/ QEMU virtual machines. The format provide
Read MoreProxmox 4.x bind mount – mount storage in an LXC container
An LXC containers storage is simple to set and maintain and is usually done through either a Web based
Read MoreExport OBIEE RPD Documentation (Data Lineage) From The Command Line
The OBIEE Administration Tool provides a useful utility for exporting the data lineage held within the
Read MoreStart Ubuntu Without Starting The Gnome Desktop (text mode)
If you’ve installed a desktop, such as Gnome, on Linux you may not need it all the time. Some of
Read MoreConvert Virtual Disk Image VMWare VMDK to VirtualBox VDI
Oracle’s VirtualBox can use a few different virtual disk types, however their own disk type is
Read MoreScript To Create A Swapfile On Linux
This 5 line script will quickly create a 512MB SWAP file that will be automatically mounted on each ma
Read MoreHow To Proxy The Apt-Get Package Manager
If you’re using Debian, Ubuntu, or any similar distribution which uses apt-get as it’s pa
Read MoreHow To Change The Zentyal Certificate Algorithm From SHA-1 To SHA256
As of Zentyal version 4.2 the bundled certificate authority (CA) module is creating signed certificate
Read Moreqcow2 Disk Images and Performance
qcow2 is a virtual disk image format developed by the guys who created QEMU and is one of the most ver
Read MoreHow To Fix A Full /boot Partition on Linux
Utilities such as apt-get generally install kernel updates by adding the new kernel to the Linux boot
Read MoreConfigure Zentyal 4.2 To Move SPAM Email To Junk Folder
Zentyal, the “all-in-one” exchange server replacement and does quite a good job delivering
Read MoreHow To Find Your Public IP Address From The Terminal
Finding the IP address of your local machine couldn’t be easier – ipconfig on Windows or
Read MoreJavascript to Refresh All OBIEE Dashboard Analysis
OBIEE isn’t designed for (near) real time reporting, and as such doesn’t have an out of th
Read MoreDownload Oracle Java From The Terminal With wget
Oracle have a very restrictive license that applies to most of their software downloads which prohibit
Read MoreGit SSL Certificate Problem Caused By Self Signed Certificates
It’s never been easier to set up your own Git server to host your own git repositories for your
Read MoreWindows Has Symbolic Links And It’s Called mklink
A symbolic Link is a reference to a file which is stored in another location to make a file or folder
Read MoreMySQL Database Alternative
There are many alternatives to MySQL that tick some of the boxes you may require. There are plenty of
Read MoreCreate a RAM Disk in Windows
I’ve been using RAM disks within Linux for quite some time now and I’ve blogged about it w
Read MoreDowngrade an OBIEE RPD Version
An RPD file saved by one version of the OBIEE Administration Tool cannot be opened by an older version
Read MoreAccess a qcow2 Virtual Disk Image From The Host
A disk image, such as the popular qcow2 disk image can be read and used as a file system without havin
Read MoreOBIEE With Essbase as a Data Source Using SSO
There are various ways to integrate OBIEE and Essbase when using SSO, each with their own security spe
Read MoreUsing Dockerfiles to build new Docker images
In a previous blog post I detailed the steps involved in creating a new Docker container, making some
Read MoreBash getops Example
getopts is a way of adding intuitive options to custom bash scripts in Linux. getopts is a command tha
Read MoreReverse Proxy Proxmox VNC With Nginx
The noVNC console in the Proxmox Web GUI transfers it’s data through a technology called Websock
Read MoreShare a Single MDS Schema Between Multiple OBIEE Installations
If you’ve installed OBIEE as many times as I have you’ll be more than familiar with the RC
Read MoreAdd a new skin to an OBIEE scaled out cluster
If you are using a cluster configuration, there are multiple methods you can use to deploy a skin. Bel
Read MoreRefresh Oracle Business Intelligence GUIDs
When copying or making significant changes to the OBIEE 11G web catalog, users can experience difficul
Read MoreUpgrade Oracle opatch Version
opatch is Oracle’s tool for patching software such as OBIEE and ODI and is used in conjunction w
Read MoreManually Install ERPNext on a Manual Install of Frappe
ERPNext is an Enterprise Resource Planning suite similar to Odoo. It manages every aspect of your busi
Read MoreManually Install Frappe on Ubuntu 14.04 With a Remote SQL Server
Frappe is a full stack web framework based on Python and Javascript which can be used to build and de
Read MoreEnable Compression in Nginx
Enabling web content compression is one of the simplest ways to save bandwidth and, for some users, s
Read MoreZimbra Email Server Intergration with SendGrid
Zimbra Email Server is an install anywhere, full featured email server solution. I know that sounds li
Read MoreInstall Nginx on Debian/ Ubuntu
Installing Nginx on Debian or Ubuntu is as easy as a single apt-get command, however it does not ins
Read MoreWhen Did my Linux Box Last Reboot/ Shutdown?
The Linux command last can tell you when your Linux system last rebooted, shutdown, who logged in an
Read MoreBash Command to Check Container Disk Space in Proxmox/ OpenVZ
Keeping an eye on all of your containers disk space can be time consuming if done one by one. Luckily,
Read MoreProxmox Error: (warning) Incorrect quota shutdown for id xxx recalculating disk usage
I came across this error today when trying to manually backup the container to create an OpenVZ contai
Read MoreBash Script to Install a mariadb-galera-server Cluster on Multiple Servers
The following script will install the MariaDB Galera Server binaries on multiple servers with a basic
Read MoreMove Proxmox Container to Different Storage
A task often required when new storage is added or removed, and containers grow over time is to move
Read MoreOpenVZ USB Passthrough in Proxmox
USB Passthrough is the concept of passing a USB device that is plugged into the host server to a guest
Read MoreNginx Error “client intended to send too large body”
You may see the below error in your Nginx web server log files, and the good news is it’s easy
Read MoreHow to Kill a Process Based on Part of the Process Name
This is a small, handy snippet to kill a Linux process based on matching a string from the ps command
Read MoreInstalling MariaDB on Ubuntu
MariaDB is termed a drop in replacement for MySQL – that means that you can deploy MariaDB witho
Read MoreMySQL Circular Replication
I spoke about master – slave replication in my previous blog post and how to set up one way repl
Read MoreMySQL Database Replication
The MySQL server can replicate a database over TCP to another instance of MySQL to provide a near real
Read MoreProxy the Proxmox Web GUI with Nginx Over HTTPS with Load Balancing
The Proxmox web GUI is served by Proxmox’s new event driven API server called PVE Proxy. The def
Read MoreCreate Your First Docker Container
Docker is probably one of the easiest environments to create a virtualised instance based on a number
Read MoreExport and Import a Docker Image Between Nodes
One of the driving forces behind Docker is to create a consistent environment across all Docker enable
Read MoreInstalling Docker on Ubuntu 14.04
Docker is an up and coming virtualisation technology utilising Linux Containers (LXC) to provide a pri
Read MoreInstalling Open vSwitch in Proxmox
Open vSwitch is a virtual switch which enables you to create multiple virtual networks on a single phy
Read MoreDefault Ports for Samba
The ports required by Samba vary depending on if you use Samba as a domain controller or not. The mos
Read MoreInstall the Splunk Forwarder on Ubuntu
The Splunk Universal Forwarder is a small, light weight daemon which forwards data to your main Splunk
Read MoreCreate a Ubuntu 14.04 OpenVZ Template for Proxmox
The latest Ubuntu long term support is now available, called Ubuntu 14.04. There isn’t currently
Read MoreInstall Splunk on Ubuntu
Splunk is the heavyweight open source software which enables you to index, visualise and explore virtu
Read MoreApache Redirect Root URL to Subfolder
The Apache HTTP is able to redirect traffic to a specific URL with use of the Apache mod_rewrite. mod_
Read MoreApache Active Directory Group Authentication
The Apache HTTP server can be used with LDAP or Microsoft’s Active Directory to authenticate use
Read MoreInstalling the OpenVZ Web Panel
There are many web front ends to the OpenVZ virtualisation server which offer varying functionality an
Read MoreInstall an OpenVZ Server on CentOS
OpenVZ servers are hypervisors which allow you to create numerous guest instances within a single hard
Read MoreBasic OpenVZ Container Management
OpenVZ containers, or CT for short, work on the premise of using a template as the starting point for
Read MoreChange the Password for an OpenVZ Container
If you have forgotten the password for an OpenVZ container – relax! Help is at hand. Luckily Ope
Read MoreRemove a Windows Service
You can easily remove a Windows service from the Windows registry using a simple command prompt comman
Read MoreAdd Create OpenVZ Template to the Proxmox Web GUI
Creating a template from an OpenVZ container is a very manual process. My biggest problem is that you
Read MoreGitlab error “fatal: The remote end hung up unexpectedly” Again
I previously wrote in this blog post about how to fix an error with Gitlab. The error was presented wh
Read MoreWindows Error: “The program can’t start because WMVCORE.DLL is missing from your computer” in Windows Server 2008″
I recently received the below error when running Blue Iris CCTV software on Windows Server 2008. The p
Read MoreCeph Storage on Proxmox
Ceph is an open source storage platform which is designed for modern storage needs. Ceph is scalable t
Read MoreCreate a 3 Node Ceph Storage Cluster
Ceph is an open source storage platform which is designed for modern storage needs. Ceph is scalable t
Read MoreManually Mount a Ceph Storage Pool in Proxmox
The latest BETA of Proxmox, and soon to be released 3.2 comes with the Ceph client automatically insta
Read MoreCeph Error “Warning: the ECDSA host key for ‘SERVER’ differs from the key for the IP address ‘IP'”
I recently received the below error when installing Ceph on Proxmox which related the the key for the
Read MoreSet up Fail2ban for Proxmox Web GUI
Fail2ban is an application that scans log files in real time and bans malicious IP addresses based on
Read MoreUpload OVA to Proxmox/ KVM
Proxmox does not have native support for an OVA template which is surprising considering it’s th
Read MoreCreate SSH Key Authentication Between Nodes
Secure key authentication is one of the more secure ways to grant users access to a Linux server. The
Read MoreHow to use PowerShell to (grep) Recursively Search for Text Within Files on Windows
The thing I find most annoying with Windows is that it isn’t Linux. Let’s forget the argum
Read MoreInstall Grails from Git on Windows
Good news: installing Grails from source is easy-peasey on Windows! Before you get started, you’
Read MoreExport MySQL Database into Separate Files per Table
I have recently been using git to check in an applications database. The database has many tables, som
Read MoreTest Internet Speed from the Command Line
Matt Martez has kindly created and shared a Python script for interacting with speedtest.net for testi
Read MoreSetup Headless Dropbox Sync Client on Linux
Dropbox is a cloud based file storage service which makes your files available from almost any interne
Read MoreMount a Windows/ Samba Share in Linux
Given the amount of trouble you can have getting Linux and Windows to play nicely together, you may be
Read MoreProxmox OpenVZ Container and KVM Startup and Shutdown Order
From time to time you will need to shutdown and startup your Proxmox hardware node. There are many rea
Read MoreBenchmark MySQL server Performance with Sysbench
You can spend hours tweaking the settings of a MySQL server instance to get the best possible performa
Read MoreSpeed up Multiple apt-get install Requests by Caching the Repository
apt-get is the tool used in Debian and Ubuntu to manage packages installed on the system. Each time an
Read Moredoskey in Windows is just like alias in Linux
doskey on Windows is very similar to alias on Linux, it allows you to set a term which will call a com
Read MoreIgnoring Files and Directories in Git with .gitignore
With Git you are able to define file exceptions to exclude certain files and folders from git reposito
Read MoreCopy MySQL Database to Another Server
The easiest way to do a one off move of a MySQL database from one server to another is to use the mys
Read MoreBash Script to Create an SSL Certificate Key and Request (CSR)
Creating multiple SSL certificates for web servers and application can be a repetitive task. Generally
Read MoreMap a Network Drive from the Windows Command Line
The windows command line can be very useful to quickly perform repetitive tasks. It is easy to write b
Read MoreSynchronise a GlusterFS volume to a remote site using geo replication
GlusterFS can be used to synchronise a directory to a remote server on a local network for data redund
Read MoreView Available Exports on an NFS server
There is a handy command called showmount which displays all the active folder exports on an NFS serv
Read MoreSimple Bonnie++ Example
Bonnie++ is a disk and file system benchmarking tool for measuring I/O performance. With Bonnie++ you
Read MoreCreate a default nginx site rule
Usually a web server can be accessed by multiple paths, such as the DNS entry of the server (eg. as ww
Read MoreScript to Automatically Detect and Restart Linux PPTP Client
The default PPTP client for Linux does not automatically start on boot, or restart on a failed or drop
Read MoreLinux PPTP Client Error: “pty option precludes specifying device name”
I was receiving this error when I was trying to start a PPTP client connection in a Linux cron. The er
Read MoreSet up Linux PPTP Client from the Terminal
A Virtual Private Network, or VPN, allows the client computer to connect to a remote local network to
Read MoreCreate a RAM disk in Linux
There are many reasons for creating a memory based file system in Linux, not least of which is to prov
Read MoreUsing a Proxy Server with Java
Java applications can use a proxy server for making HTTP/ HTTPS connections to the internet by adding
Read MoreReverse Proxy Proxmox with Apache
The Proxmox web GUI is accessible on port 8006 by default using SSL encryption. The web GUI is served
Read MoreHow to Cluster Proxmox
Clustering is a technique to group together multiple machines or devices providing common parameters,
Read MoreOpenVZ disk space issues
I started to receive an error in one of my Proxmox OpenVZ containers which indicated that the quota ha
Read MoreGitlab error “fatal: The remote end hung up unexpectedly”
I have been using Gitlab for a while now to run a local Git server for storing code and documentation
Read MoreBackup all Proxmox OpenVZ containers in one go
The below script is a bash script which works with Proxmox and the OpenVZ commands to backup all known
Read MoreIncrease mdadm raid rebuild speed
mdadm can take quite a while when rebuilding arrays and the more disks there are, the longer it will t
Read MoreReverse Proxy Subsonic with Apache
Subsonic is a web-based media player for playing audio and video files through a web browser. You can
Read MoreHow to grow a mdadm RAID 5 array
mdadm is a software RAID technology for creating local volumes with RAID functionality such as RAID 5.
Read MoreAdd a package to startup on Debian/ Ubuntu/ Red Hat/ CentOS
Most versions and distributions of Linux today have a start up manager application to easily set which
Read MoreChanging the OMS password on OpenNode
The OpenNode Management Server is installed with a default password. To help ensure your OpenNode serv
Read MoreRestore a single Proxmox OpenVZ Container From The command Line
I mostly use Proxmox from the command line, or terminal, and I have created a few scripts to perform c
Read MoreRestore all Proxmox OpenVZ Containers From The command Line
I use Proxmox to host a development environment using OpenVZ containers. I take frequent backups of al
Read MoreAdvanced GlusterFS Log Rotation
If installing GlusterFS on Debian using the launchpad repository then a log rotate entry will be autom
Read MoreSimple GlusterFS log rotation
You’ll be glad to know that GlusterFS has built in log rotation! This means that you can use a s
Read MoreUpdate OpenNode OMS to the Latest Version
OpenNodes web management GUI (OMS) runs in it’s own OpenVZ container. To update the running OMS
Read MoreInstall OpenNode web GUI (OMS)
The OpenNode Management service, or OMS, is used to administer OpenNode via a web based GUI. The OMS i
Read MoreInstalling OpenNode 6
Installing OpenNode is much like installing any other modern Linux distribution. You start with a text
Read MoreMount NFS volume in a Proxmox OpenVZ container
There are various options for adding additional storage to an OpenVZ container. You can add additional
Read MoreNFS Mount Error on OEL
I have been using an Oracle Enterprise Linux (OEL) OpenVZ container in Proxmox for installing some Ora
Read MoreProxmox OpenVZ SWAP and Performance
I have been having trouble with a Proxmox node which is only running OpenVZ containers however it is a
Read MoreMy experience with GlusterFS performance.
I have been using GlusterFS to replicate storage between two physical servers for two reasons; load ba
Read MoreGlusterFS performance tuning
I have been using GlusterFS to provide file synchronisation over two networked servers. As soon as the
Read MoreRemove the Proxmox “No Valid Subscription” message
Proxmox 3.1 has implemented a new repository setup, as described in my recent blog post. Each time you
Read MoreBenchmark disk IO with DD and Bonnie++
Benchmarking disk or file system IO performance can be tricky at best. The problem is that modern file
Read MoreTesting network speed with Iperf
Iperf is an Open source network bandwidth testing application, available on Linux, Windows and Unix. I
Read MoreLatest git on Ubuntu
I have recently been playing around with Git on Ubuntu and noticed that the version in the standard re
Read MoreGlusterFS storage mount in Proxmox
Proxmox 3.1 brings a new storage plugin; GlusterFS. Thanks to this storage technology we can use distr
Read MoreAdd launchpad PPA repository to Ubuntu
Most Linux based systems use a software repository which is either local (a CD-ROM) or remote (a web a
Read MoreProxmox bind mount for OpenVZ – mount storage in a container
You can allocate storage to an OpenVZ container during creation, when the container is offline and eve
Read MoreZFS and GlusterFS network storage
Since ZFS was ported to the Linux kernel I have used it constantly on my storage server. With the abil
Read MoreZFS dataset encryption
ZFS datasets support a host of features to help you manage your storage mounts as effectively as possi
Read MoreZFS dataset compression
ZFS datasets support a host of features to help you manage your storage mounts as effectively as possi
Read MoreCreate a ZFS volume on Ubuntu
ZFS is a disk and logical volume manager combining raid like functionality with guaranteeing data inte
Read MoreGlusterFS firewall rules
If you can, your storage servers should be in a secure zone in your network removing the need to firew
Read MoreShare GlusterFS volume to a single IP address
When you create a new GlusterFS Volume it is publicly available for any server on the network to read.
Read MoreSetup Glusterfs with a replicated volume over 2 nodes
This post will show you how to install GlusterFS in Ubuntu/ Debian however the steps will be similar w
Read MoreMount a GlusterFS volume
GlusterFS is an open source distributed file system which provides easy replication over multiple stor
Read MoreProxmox 3.1 package/ updates manager
Proxmox version 3.1 made a huge change to the way updates are managed. Prior to version 3.1, updates f
Read MoreCreate a permanent virtual IP address in Linux
In a previous post, we saw how to create a virtual IP address, based on an existing network interface.
Read MoreApache – redirect traffic to a different url
Some web applications I work with are only available on a URL similar to http://hostname/application.
Read Moreiptables in a Ubuntu OpenVZ container
If you need a software firewall to shield containers on a Proxmox stack, you should always use a firew
Read MoreEnable Proxmox installation debugger
Although installations of Proxmox usually go smoothly, sometimes you may have problems detecting stora
Read MoreProxmox advanced install settings
Installing Proxmox is quick and easy – the installer GUI takes care of everything, such as insta
Read MoreSamba: The process cannot access the file because another process has locked a portion of the file
I had a problem with a SMB share which was sharing storage from an NFS mount. Whilst you could argue t
Read MoreReclaim disk space from a sparse image file (qcow2/ vmdk)
Sparse disk image formats such as qcow2 only consume the physical disk space which they need. For exam
Read MoreHow to change a linux login password
It’s easy to change your password in linux – don’t bother with the GUI’s which
Read MoreCreate a Virtual IP Address in Linux
This post will detail how to set ip a virtual IP address and assign an interface to handle the traffic
Read MoreRestart Windows from the command line
Sometimes you may want to restart windows without clicking the Start menu. In some cases, such as in a
Read MoreHow to make a new OpenVZ template from an existing template for Proxmox
The kind folks over at OpenVZ.org have created a rift of templates which we can use as a starting poin
Read MoreLimit backup I/O bandwidth
When backing up in Proxmox, especially on the lower end of the server market, the backup process can c
Read MoreBackup ESXi 5.x running virtual machine
ESXi does not provide an option to backup a running virtual machine, without paying VMware a substanti
Read MoreSet I/O Priority for Proxmox/ OpenVZ Containers
Since the 2.6.18-028stable021 kernel, it has been possible to set the I/O priority of an OpenVZ conta
Read MoreWordPress and OpenSearchServer
OpenSearchServer is an open source website crawler and query engine to provide advanced search capabil
Read MoreHow much disk space does Proxmox 2.x require?
Proxmox can be installed on very little disk space. I tested Proxmox version 2.2 and installed it on a
Read MoreProxmox OpenVZ CPU units
OpenVZ containers have a mechanism in place to prioritise CPU resource assignment. You can make
Read MoreSimple Apache reverse proxy example
Background Apache can be used as a reverse proxy to relay HTTP/ HTTPS requests to other machines. This
Read MoreApache 2 catch all virtualhost
Background Apache VirtualHosts are something of a must for running multiple sites with different web a
Read MoreInstall Proxmox
What is Proxmox? Proxmox is a hypervisor which can host hardware virtualized virtual machines as well
Read MoreLogin to Proxmox web GUI
You can access the Proxmox web GUI from a web browser using the https protocol, your Proxmox server I
Read MoreAdd test repository to Proxmox
Proxmox has a test repository (repo) which can be used to deliver the latest software and updates usin
Read MoreSetup Active Directory Authentication in Proxmox 2
Proxmox 2 makes setting up AD authentication simple if you have the AD server names. AD only provides
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