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 […]

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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 && […]

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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. […]

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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 […]

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Sending logs to a syslog server

If you are running a linux server, go ahead and install rsyslog. yum install rsyslog You will need to edit the rsyslog config file. vi /etc/rsyslog.conf Add the following line. # ### begin forwarding rule ### # The statement between the begin … end define a SINGLE forwarding # rule. They belong together, do NOT […]

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Building a Syslog Server

Go ahead and deploy your server, if you havent yet take a moment to do so. Installing rsyslog: yum install rsyslog After the files have been installed, edit /etc/rsyslog.conf vi /etc/rsyslog.conf Once in, you’ll need to uncomment the following two lines $ModLoad imudp $UDPServer Run 514 $ModLoad imtcp $InputTCPServerRun 514 Save the file and close […]

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