How do I set or change (default) runlevel using systemd in CentOS 7/RHEL 7
This article gives you an overview of transition from System V init scripts to Systemd. Some of the benefits of systemd over the traditional System V init facility include: *
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Host gets stuck at certain percentage while entering maintenance mode in Full Data Migration (VMware, vSAN)
### **Problem Statement**: Host stuck at a 68% (certain percentage) while entering vSAN Maintenance Mode. When you enter a vSAN Maintenance mode with option "Full data migration", its bound to
How to use iperf3 tool to monitor network bandwidth in Linux
I have already written an article to check the network bandwidth speed using netperf available at below link [How to monitor network bandwidth in Linux using netperf]({{< relref "how-to-monitor-network-bandwidth-in/index.md" >}}) In this article
sed: add or append character at beginning or end of line (row) of a file
You may have some requirement wherein you have to cut a row or get some output from a file and append it to another file as a prefix or suffix.
sed: Ignore whitespace while matching a pattern
In my last articles I had shared the arguments with sed which can be used to [perform case insensitive actions (search, replace..) in a file]({{< relref "sed-case-insensitive-actions-search/index.md" >}}) and to [delete all blank
How to fix "Postponed keyboard-interactive for invalid user <username> from <host> port <port_no> ssh2 [preauth]"
The other day I was unable to perform a passwordless (passphrase) based authentication for one of my user and for every attempt I was getting the below
How to print or grep only the matched string or text or word or pattern in Linux using bash
By default when we use grep without any switch it prints the entire line which matches the string we tried to grep for ***For eg*** I would like search for
How to forcefully sync date and time using the NTP server in Linux
The commands and steps to initiate a forceful sync with NTP server may vary based on the distribution you are using. By default if NTP service is running it will
How to redirect specific log messages to separate log file using rsyslog in Linux
In my earlier articles I had shared the steps to [transfer the rsyslog messages to a different host]({{< relref "how-to-remote-logging-using-rsyslog-omfwd-redhat/index.md" >}}) with and without [TLS certificates](https://www.golinuxcloud.com/generate-self-signed-certificate-openssl/). The difference is that with TLS certificates
How to find ethernet network card firmware and driver information in Linux
Based n the Linux Variant you use the commands and their output may differ. I have worked on Red hat Enterprise Linux and SuSE Enterprise Linux and below commands and