We have created a Nagios plugin called check_ssl_cert_expiry . The nagios plugin will send the alert (warning/critical) before SSL Certificate expiry date. We have tested this plugin to check HTTPS website URL. It is working very well. Why we require check_ssl_cert_expiry nagios plugin To know how many days are left before date of expiration of…
The tutorial explains about how to change the telnet server port number on CentOS 7 / RHEL . We will keep SELINUX in enforcing mode and change the default port number 23 to some other port number. We believe you have already install telnet server on CentOS 7 / RHEL 7. Task : Change telnet…
The tutorial explains about how to install telnet server on CentOS 7 / RHEL 7 . We will also keep SELINUX on enforcing mode and use the firewalld rules. About Telnet Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual…
In this tutorial we will learn how to create new swap file on CentOS 7 / RHEL 7. Generally on Cloud Servers ( AWS/ DigitalOcean) or VPS, swap space is not created by default. This requirement we can achieve within a few steps. Prerequisites Must have free space on mounted disk. You can check by…
This tutorial will help you to setup htpasswd on Wordpress wp-admin running on Nginx server. For security point of view it is important to protect the wp-admin of Wordpress. When any user hit your Wordpress blog URL with /wp-admin , it will get the wordpress Admin dashboard to login.
Recently we got the system which has MySQL server version 5.1 was running. It was good chance for me to reproduce the issue and show practical answer on question asked on stackoverflow. Operating System: CentOS 6.5Arch : x86_54 Symptom MySQL service failed to start after upgrading from MySQL 5.1 to 5.6 version. Given below is…
While configuring the Nginx we encountered the error – “could not build the server_names_hash, you should increase server_names_hash_bucket_size “. In server the Nginx service were failing to restart
Recently I created a new nagios plugin which check the no. of instances attached in ELB (Elastic Load Balancer) . Here we are talking about ELB in AWS (Amazon Web Service) Cloud. Elastic Load Balancing automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud. Details of check_ELBinstance nagios plugin Requirement :…
FAQ : How to connect to Ubuntu Desktop / Server by using ssh. I just installed Ubuntu 14.04 LTS Desktop edition and have not found ssh service running in system. Answer : OpenSSH is a FREE version of the SSH connectivity tools. It provides the encrypted communication between computers by using ssh protocol. History of…
The post will explain, how to install MariaDB Server 10.0 on Ubuntu 14.04 LTS (Trusty Tahr) . MariaDB which is now a days very popular. It is fork of MySQL and best alternate of MySQL. Red Hat has already announced the MariaDB as default Database in Verion RHEL 7.0. I surely suggest you to know…
This time we need to redirect the output to a file where user needs sudo privileges. The tutorial explains, how to redirect sudo output to a file in easy way. We will share some examples, which help you to redirect the output into a file where sudo command is required. In case you are trying…
In this post we will learn, 3 steps to install skype 4.3.x version on Ubuntu 14.04/ 12.04 .You can get the skype from Canonical Partner Repository. Skype is one of the wonderful software by which you can call and chat to other person via internet. At the time of writing this post Skype 4.3.0.37 was…
We are back again with Owncloud installation tutorial.In this post we will learn, how to install Owncloud 7 on Ubuntu 14.04 server. In our previous post , we have installed Owncloud 6 on Ubuntu 14.04 LTS server. Now Owncloud team presenting an awesome 7th version. It has many features. One of the known is ownCloud…
In this post,I am sharing the troubleshooting steps for cron job problem. You may have seen many times, the cron job stopped working suddenly or not working on first instance. As a Linux System Engineer,I also faced this problem many times.The reasons are many and we are sharing few them which generally occurs. What is…
In this post , we are explaining how to use tr command to convert lines or rows to space , tab , vertical tab and vertical tab. In our last post we have explained converting lines to space by using sed command. This time we will use tr command, which translate, squeeze, and/or delete characters…