Why shell script is giving syntax errors despite no issue with the script? You might check the script multiple times but still couldn’t figure out what’s causing the problem? I personally come across a similar problem whenever I copy the script from a windows laptop to *NIX systems. The error message contains “syntax error near […]
Linux
How to generate a CSR file to get a valid SSL certificate?
How to generate a CSR (certificate signing request) file to produce a valid certificate for web-server or any application? This article will walk you through how to create a CSR file using the OpenSSL command line, how to include SAN (Subject Alternative Names) along with the common name, how to remove PEM password from the generated […]
Cleanup all Docker containers using a single command
How to stop all the docker containers? How to destroy docker containers quickly? How to remove all the downloaded docker images? Very often we deploy the containers for testing and spend time cleaning up the containers one by one. This article will provide quick commands to stop all the running containers and delete them quickly. […]
Install and configure Git client on RHEL 7 /CentOS 7?
Install and configure Git client on RHEL 7 /CentOS 7? Git client is a very useful command-line utility to manage git repository from Linux. Git is the most popular distributed version control and source code management system. This article will walk you through how to install git on CentOS 7/ RHEL 7. It also walks […]
How to find Linux is under BIOS or UEFI mode ?
How would you find your Linux server booted in BIOS mode or UEFI mode? What’s the main difference between BIOS and UEFI? Servers which had shipped prior to the 2011 year have only BIOS firmware installed by default. BIOS is legacy firmware used only on X86 hardware and its 16-bit code. BIOS will take more time for […]
How to fix Meltdown & Spectre Vulnerabilities on Redhat Linux?
Redhat is closely working with Intel and AMD to mitigate the risk of micro-architectural (hardware) implementation issues which are named as Meltdown and Spectre. These vulnerabilities are mostly affecting many modern microprocessors which include Intel, AMD, IBM power and ARM processors. These issues can be overcome by updating Linux kernel, virtualization-related components, and/or in combination with […]
LINUX – SCSI Device Management – Identifying Devices
This article is going to share very least used SCSI commands on Linux operating systems. These commands will be very useful to identifying SCSI devices and tuneable parameters. There are few utilities which can be used to get the detailed information about the scsi devices. lsscsi is most command tool which scans sysfs pseudo file […]
Solaris Linux Interview Questions – Cluster
As we all know that attending interview is one of the toughest job.Because, you never know the interviewer expectation and his mindset.He/She may be started asking questions which are related their current working environment and interviewee may not know the those setups. Companies also adding more competencies to filter the candidates. One of the important skill sets to […]
TCPDUMP-How to Capture the Network Packets on Redhat Linux?
Troubleshooting network issue is not an easy task in any operating systems.In order to troubleshoot network issues, you need to capture the network packets in OS level and need a help from network team. Earlier we have discussed about snoop utility which is default packet analyzer in Solaris operating system.In Redhat Linux you have utility called “tcpdump” which is freeware and distributed […]
Redhat Linux – LVM Volume Attributes
Redhat Linux’s Logical volume Manager has many attributes which are available for controlling the behavior LVM objects or to changing the default values of LVM. We may not use those attributes very often in typical production environment but knowing is not a bad thing. As a Unix/Linux admin,we should have capability to explain each and every field of […]