Category Archives: Linux

How to Check RAM/Memory by Percentage

Assalamualaikum, Using the the free command: This will report the percentage of memory in use % free | grep Mem | awk ‘{print $3/$2 * 100.0}’ 23.8171 This will report the percentage of memory that’s free % free | grep … Continue reading

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RHEV/oVirt Environment is Non Responsive with Errors as: Received fatal alert: certificate_expired

Assalamualaikum. Issue 1. Certificates have expired and all hosts are non responsive 2. Getting error as below in the engine logs: ERROR [org.ovirt.engine.core.vdsbroker.irsbroker.UploadStreamVDSCommand] (DefaultQuartzScheduler_Worker-64) [6d32f092] Command ‘UploadStreamVDSCommand(HostName = xyz, UploadStreamVDSCommandParameters:{runAsync=’true’, hostId=’12345dbe-1db1-11e1-ade1-00215e97f418′})’ execution failed: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_expired ERROR [org.ovirt.engine.core.bll.UploadStreamCommand] … Continue reading

Posted in Linux, oVirt, RedHat, RHEV, RHV, Virtualization | Tagged , , , ,

How to Identify the File System Type in Linux/Solaris

Salam.. There are few methods how to determine your linux file system. Below are commands that I usually use. Linux $ df -Th $ df -Th | grep “^/dev” $ fsck -N /dev/sd* $ lsblk -f $ mount | grep … Continue reading

Posted in freeBSD, Linux, Solaris, UNIX | Tagged ,

Happy New Year 2018!

.. Last login: Tue Jan 2 12:11:49 2018 from 104.223.123.98 [hanief@master ~]$ mv 2017 /archive [hanief@master ~]$ sudo mkdir 2018 [hanief@master ~]$ cd 2018 [hanief@master ~]$ vi goals.sh [hanief@master ~]$ chmod +x goals.sh [hanief@master ~]$ nohup ./goals.sh & [hanief@master ~]$ … Continue reading

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CentOS-7 “Minimal Desktop” installation (GNOME)

Assalamualaikum.. For some reasons you need to install GUI on your CentOS server. In my case, I having a bad time to install Oracle Database 12c in my CentOS using CLI. I don’t have plenty of times struggling with CLI … Continue reading

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How to Setup network on RHEL/CentOS 7 (Minimal)

Assalamualaikum… Issue: Not able to connect to network/internet. Caused by: Ethernet interfaces are not enabled by default. Step 1: First, type “nmcli d” command in your terminal for quick list ethernet card installed on your machine: Step 2: Type “nmtui” … Continue reading

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How to Install Cacti on CentOS 7

Assalamualaikum.. Cacti is a configurable, scalable network and resource monitoring system based on the RRDTool suite. It works on systems ranging from simple LAN installations, to multi data center LANs. Cacti provides user management, as well as acquisition of data … Continue reading

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