Check_oracle_health is a great Oracle Database monitoring Tools. This plugin help you retrieve a variety of data such as the time to connect to a database, the number of connected users, the invalid objects sum, free space in a tablespace and many other counters …
We will use it with Centreon to exploit check_oracle_health data monitoring as graphs. A dedicated Nagios part is also in this article.
Your Linux machine is so stable that it’s been several months since you didn’t log on it. Bad luck, you do not add the Root password in your password manager. You are trying to connect, trying every conceivable password, impossible … you forgot! No Stress, here’s a technique that let you reset your root password on your CentOS.
Nagios is a monitoring tool under GPL licence. This tool lets you monitor servers, network hardware (switches, routers, …), applications and services. A lot of plugins are available (more than 3000) and its big community makes Nagios the biggest and the most maintained open source monitoring tool. This tutorial shows how to install Nagios 4.0.1 on CentOS 6.4.
Nagios 4 is the latest stable release published the 20th of last september. This release improved disk I/O latency, some new configuration variables, and other specifications available here : What’s new in Nagios core 4.X.X.
To better secure WordPress, and access to the wp-login administration page, I will explain how to avoid attacks by Brute-Force through the establishment of new fail2ban filters.
When you arrive on the wp-login.php space, you enter your login / password, if correct, wordpress lets you enter the administration area, and writes the code HTTP/302 “redirect” in your log file “access_log”,you are redirected to the “wp-admin” folder. By cons, if you enter the wrong login / password, you stay on your wp-login page, and HTTP/200 code “OK” is registered in your access_log file.
Therefore, we will ask our fail2ban to filter the access_log file HTTP/200 codes on wp-login page of your wordpress.
“Upload too large : The files you are trying to upload exceed the maximum size for file uploads on this server.”. After installing owncloud, this type of error can happen, depending on the type of files you uploaded,more or less voluminous they are.
Here’s how to solve the problem MAX_FILE_SIZE (really be on the safety of its server before changing its values) :