By default, FreeBSD doesn’t install a python package in its standard distribution. So, we need to install python, either manually or using ansible module.

$ ansible freebsd-host -m raw -a 'env ASSUME_ALWAYS_YES=YES pkg install python' -u root

Of course before we can use ansible we have to install public key authentication and enable SSH to root user in FreeBSD host from controller machine. FreeBSD install python in different path than Linux machine, so we must set variable for the python interpreter, either in host file or variable files.

The Prologue

My college was the only college I know that gave the chance to its students to run the college network infrastructures. It encourages the students to study more outside their respective fields and share the knowledge in a community. Only a handful of people know that in the early days, the network infrastructure of my college, was built through the hands of its own students and the tradition to maintain it has been passed through the new generation of students.

Ini adalah tulisan pertama di blog ini yang membahas tentang hardware dan yang pertama menggunakan bahasa Indonesia. Sensor temperatur LM35 (datasheet) adalah sensor IC (Integrated Circuit) yang memberikan respon terhadap perubahan temperatur di sekitarnya dalam bentuk keluaran tegangan analog. Sensor temperatur LM35 bekerja pada tegangan 4 sampai 30V dan mempunyai respon linear 10mV/derajat Celcius pada rentang -55 sampai 150 derajat Celcius berdasarkan datasheet yang tersedia. Akuisisi data menggunakan sensor temperatur ini adalah percobaan sederhana yang bisa dikembangkan untuk perangkat Internet of Thing. Garis besar percobaan ini adalah keluaran dari sensor LM35 dibaca oleh Arduino melalui pin input analog (A0). Pin input analog Arduino mengeluarkan nilai dengan resolusi 10 bit untuk rentang 0 sampai 5V. Untuk mengetahui tegangan keluaran dari sensor LM35, diperlukan perhitungan berikut ini,

Percona Server 5.6 is the latest release of drop-in replacement for MySQL®. The new version offers all the improvements found in MySQL 5.6 Community Edition plus scalability, availability, backup, and security features found only in MySQL 5.6 Enterprise Edition, which requires a support contract from Oracle to access. Percona Server 5.6 is free, open source software which includes superior diagnostics and improved integration with other Percona software. In this documentation, I will show how to install Percona Server 5.6 on CentOS 6.

Beanstalkd is a simple, fast work queue. Its interface is generic, but was originally designed for reducing the latency of page views in high-volume web applications by running time-consuming tasks asynchronously. In this documentation, I will show how to install Beanstalkd on CentOS 6.

Install Beanstalkd from EPEL repository using yum

sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
sudo yum install beanstalkd

Enable and start Beanstalkd service

sudo chkconfig beanstalkd on
sudo service beanstalkd start

Reference: https://kr.github.io/beanstalkd/download.html

Sensu is often described as the “monitoring router”. Essentially, Sensu takes the results of “check” scripts run across many systems, and if certain conditions are met; passes their information to one or more “handlers”. Checks are used, for example, to determine if a service like Apache is up or down. Checks can also be used to collect data, such as MySQL query statistics or Rails application metrics. Handlers take actions, using result information, such as sending an email, messaging a chat room, or adding a data point to a graph. There are several types of handlers, but the most common and most powerful is “pipe”, a script that receives data via standard input. Check and handler scripts can be written in any language, and the community repository continues to grow! In this documentation, I will show how to install Sensu on CentOS 6.