Development, Analysis And Research
by Andrew Johnstone
Archive for January, 2010
EC2: New instances and firewalls
In: Linux
30 Jan 2010We hold much of our server configuration within the office, which is restricted down by iptables. As such when spawning new instances on EC2 we need to allow access to our internal network via iptables, to allow nodes to connect to the office and configure themselves. The following script can be run within a crontab [...]
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- Tags: EC2
I previously described how to configure HA Proxy and ucarp to load balance traffic between servers and share common IP addresses in the event of failure, however this still leaves holes in the availability of the application. The scenario only accounts for availability within a single data center and does not address how traffic and [...]
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- Tags: EC2, HA, High Availability
EC2 Tools Installation: AMI, API, Elastic Load Balancing (ELB), Auto Scaling and Cloud Watch
In: General
16 Jan 2010Updated bash script 23/01/2010: The script was assumed to run from EC2 itself, however I have since modified this so its applicable to local environments and made a little more robust. There are quite a number of new tools from EC2, each requiring some form of setup on the server. As a result I have [...]
Lock Files in PHP & Bash
In: General
2 Jan 2010I just read “How to use locks in PHP cron jobs to avoid cron overlaps” and I thought I would elaborate on this and provide some more examples. In order for a lock to work correctly it must handle, Atomicity / Race Conditions, and Signaling. I use the following bash script to create locks for [...]
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Andrew Johnstone is a software engineer / lead developer working at Everlution Software.
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- apt-get unattended / non-interactive installation | Development, Analysis And Research: [...] previously wrote about “Installing Java & MySQL – unattended/non-interactive insta [...]
- franck: http://en.wikipedia.org/wiki/FreeBSD_jail [...]
- franck: That web server should not live in such close proximity to that SMTP server... chroot/jail may be th [...]
- Vagrant – Automating PHP Installation with bash/slack for continuous deployment | Development, Analysis And Research: [...] More examples of installing MySQL unattended can be found at Installing Java & MySQL – u [...]
- Can the NIC ucarp uses be bridged? - Admins Goodies: [...] http://ajohnstone.com/achives/running-several-vips-on-the-same-interface-with-ucarp-and-haprox [...]
- apt-get unattended / non-interactive installation
- PHP apache_note, Graphite & Logster for logging
- Vagrant – Automating PHP/MySQL Installation with bash/slack for continuous deployment
- PHP5.3 autoload/class_exists fail
- Selenium
- Installing Java & MySQL – unattended/non-interactive installation
- Memcached multigets – ubuntu vs debian
- Optimizing and testing MySQL over NFS with NetAPP
- MySQL oddity with disappearing body of stored procedures
- MySQL to Oracle synchronization using PHP over VPNC