Ubuntu / Debian : gpg error the following signatures couldn’t be verified
Solve ‘”gpg error the following signatures couldn’t be verified” encountered while installing package through apt command’
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vi / vim : Remove space at beginning and end of each lines
In this article, we will learn in vi / vim editor how can we remove all the spaces at the beginning or end of the file. Recently, we have encountered the problem where contents where copied from one file to another file with new file extension. There we found too many uneven spaces in each line at beginning and end.
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Nagios monitoring on AWS Autoscaling group instances
Setting Nagios monitoring alerts on instances behind the AWS Elastic Load Balancer (ELB) is always tricky part. In this post, we will learn how we can monitor the instances which are created by autoscaling policy and running behind the ELB. We expect our reader do have good knowledge on scripting, nagios and AWS comptuting. This…
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Postfix + SES : SASL authentication failed
After configuring AWS SES service with Postfix, you may have found error in logs – SASL authentication failed . The error will not allow you to send email from server by using AWS SES service.
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Send nagios report as pdf file email
The tutorial will give an idea, how you can send Nagios Report as pdf file via email. We will achieve this requirement, with the help of script and using wkhtmltopdf command line tool
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Convert website page to pdf and image
To convert website page to pdf and image is very useful for various reasons. This kind of requirement you may have seen while making any report and we need to convert website page to pdf or image. Recently, we got requirement to create website page to pdf for some report. Actually the report was displaying…
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Python headers are required to build Mercurial but weren’t found
Python headers are required to build Mercurial but weren’t found
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2 Methods to Install Ansible on Ubuntu, CentOS and RHEL
Learn what is Ansible and its features. How to install Ansible on Ubuntu. Red Hat and CentOS in various versions. The Article will help you to provide basic understanding on Ansible and help you to get started.
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Set postgres password on PostgreSQL 9.4
Learn how to set password on Potgresql database server.
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Install postgresql 9.4 on Ubuntu 14.04 LTS server
Learn how to install postgresql 9.4 on Ubuntu server
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Install webmin on Ubuntu 14.04 LTS Server
Webmin which is a web based system administration tool for unix based servers . The post will guide you to install latest webmin on Ubuntu 14.04 LTS Server. The webmin has list of modules to manage the unix / linux servers. One of the well known module is Virtualmin which will talk later on our…
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print new line character in Unix / Linux
This is quick post on print new line character in Unix / Linux. Here, we will share two methods of print / echo new line character. Generally , when we do bash/shell scripting most of the time we require this. Let’s start this essential basic of bash/shell scripting. echo command : new line character In…
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jemalloc/jemalloc.h: No such file or directory – Redis
Recently while installing redis from source, met with error – zmalloc.h:50:31: fatal error: jemalloc/jemalloc.h: No such file or directory . It seems the jemalloc is the dependency which is not allowing redis to compile. NOTE: We have already install redis 3.0 from source on Ubuntu 14.04 / CentOS 7 / RHEL 7 , where we…
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Install redis 3.0 from source on Ubuntu 14.04 / CentOS 7 / RHEL 7
In this tutorial we will learn, how to install redis 3.0 from source on Ubuntu 14.04 / CentOS 7 / RHEL 7. In our previous post we wrote tutorial on, install redis on CentOS 7 with yum command . Redis is a an Open Source advanced key-value cache and store . To know more about…
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wget : continue download of the file
Wget command is generally used by many Linux/Unix users. GNU Wget is a free utility for non-interactive download of files from the Web. It supports HTTP, HTTPS, and FTP protocols, as well as retrieval through HTTP proxies (The definition taken from man wget command). If you are internet user, you many times have faced with…
