A detail-minded individual, combining strong technical understanding and communication skills with experiences in Systems administration; a proven methodical problem solver.


SMTP auth relay with postfix

In case that your SMTP server has authentication (like Gmail), For this purpose we will use Postfix. I Install the needed packages: Ubuntu apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules CentOS yum update && yum install postfix mailx cyrus-sasl cyrus-sasl-plain Set Postfix config file /etc/postfix/main.cf. Add this lines to the end of the file: Set Postfix config file /etc/postfix/main.cf. Add this lines toRead the Rest…


How to properly upgrade wazuh with a major update (standalone setup)

Upgrade from the same major version (3.x) The following steps show how to upgrade to the latest available version of Wazuh 3.x (which implies upgrading to the latest version of Elastic Stack 6.x). Starting the upgrade If you followed our manager or agents installation guides, probably you disabled the repository in order to avoid undesired upgrades. It’s necessary to enable them again to getRead the Rest…


How to survive a log flood – wazuh

This is directly from wazuh documentation, but I thought it would good to have here for people browsing through. I guess the main section to take notice of is how to augment the agent buffer via the ossec.conf on the client side for troubleshooting purposes Survive a log flood A centralized logging system needs to be able to process manyRead the Rest…


How to update java on centos

First of all, check your current Java version with this command: java -version Example: $ java -version java version “1.8.0_181” Java(TM) SE Runtime Environment (build 1.8.0_181-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode) If your installed version is not Java 8 update 181, then you could follow the step in order to download the latest Java version and install it: Download the Java JRE packageRead the Rest…


Wazuh-agent troubleshooting guide.

If you see this error in kibana on an agent. It could be for a number of reasons. Follow this process to figure it out. Agent buffer on the client is full, which is caused by flood of alerts. The agents have a buffer size to keep resources on the clients consistent and minimal. If this fills up then kibanaRead the Rest…


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