Configuring your MySQL database and preparing it for Confluence/Jira

Let’s go ahead and get started with the database. First, you need to find out what your randomly generated password is. grep ‘temporary’ /var/log/mysqld.log Well, need to use that password in just a sec. Log in to the database with the following command. mysql -u root -p Once you enter the password that you just […]

Protected: Installing and preparing MySQL on RHEL/CentOS

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Upgrading and Installing with RPM

RPM Package Manager RPM package manager is commonly use with RHEL/CentOS based Linux Distros. The name Redhat Package Manager or RPM, refers to the files format, .rpm If you are attempting to install from a RPM file, you will need to specify with the “-i” option. If you are attempting to upgrade from a RPM […]

Nagios Notifications Not Working

If for some reason, your Nagios server stops sending out host alerts it’s more than likely that recent update broke it. If that is the case, you will need to re-run the update, which should fix the issue. In the event that this does not fix the problem, check your email settings in nagios. This […]

XINETD/NRPE | Cannot Write to Pidfile

Cannot write to pidfile ‘/var/run/nagios/nrpe.pid’ – check your privileges. This error occurs when the “pidfile” cannot be rewritten. In most cases, this happens after a reboot and the file itself is read-only instead of read/write. If that is the case, go ahead and restart the xinetd and nrpe services. service xinetd restart service nrpe restart Next, check the status […]

Configure NRPE/XINETD

Enter the following commands into your terminal session: cd /tmp wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz After the file has downloaded, you will need to unzip the file tar -xzf linux-nrpe-agent.tar.gz Then enter the new directory. cd linux-nrpe-agent Inside the new directory, there will be a number of scripts and config files. You will need to run “fullinstall” ./fullinstall […]

Adding more users to a VNC Server

If you already have a VNC Server, then you will know how this works. We’re going to add another user to the VNC. It’s a very similar process to going through the initial installation process. Go ahead and log in to your system and switch over to root… If you are not already signed in as root. […]

Install VNC-Server on CentOS 7

First, i logged into my server as root, to make things a little easier. I would recommend doing the same thing to help speed up the processes. After I logged into the system, I installed VNC-server. yum install tigervnc-server Once all the packages were installed, go ahead and run an update. yum -y update && […]

Enable noop IO scheduler

Noop Scheduler, for those of you who don’t know, is the simplest I/O scheduler for Linux. NOOP scheduler inserts all incoming I/O requests into a simple FIFO queue and implements request merging. In other words, the scheduler assumes that the host is unaware of how to productively re-order requests. There for, noop handles all IO scheduling. Lets enable enable noop. […]

Slow SSH Login | UseDNS=no

Problem: When SSH’ing into a server, connection, and login take a long time. Connect to a server Attempt to log in, and wait to see how long the connection takes. 10+ seconds is too long and should be investigated. Wait for the password prompt and then proceed to cat /etc/ssh/sshd_config | less use vi to […]