The one who new to Ubuntu like me may face difficulty in understanding grub.cfg. But making Ubuntu to boot into older or previous kernel version is really simple. The configuration is same like Redht except small change in syntax. Continue reading “Boot previous kernel version – Ubuntu 16.04”
Ansible can report execution time for each task. And total time taken for playbook execution. It is more useful to estimate the time of completion as specially for long running jobs. Continue reading “Get execution time of each task – Ansible”
Have created a small bash script to monitor wordpress site status and report to the web admin in near real time. I really enjoyed the benefit of outcome of this script. What it does? Continue reading “monitor wordpress site through bash script”
Q: Our wordpress website hosted on Linux + Apache + MySQL. Here the issue is page not loading at all. Have did restart the apache server. Then it worked well for few seconds. Again the page stopped loading. All of my clients have seen server unreachable error. There was no configuration change been done in wordpress site. All of us sudden it happened. How to fix it quickly and make my website available to users? Continue reading “WordPress website page not loading”
Linux server does not responding to application queries. The performance is too low. Underlying disks or SAN LUN’s are normal. From top output found the I/O wait is too high. But there is no I/O intensive tasks are running. While, How to fix high I/O wait issue? Continue reading “Linux – How to fix high I/O wait issue?”
In my previous article explained about how to delete disk from ASM library. In this article will learn to delete the LUN and remove traces from server. This article applicable for deleting ASM disk, standard partitioned disk and LVM physical volume. These steps works well for Redhat and SUSE. Continue reading “Linux – delete the LUN and remove traces from OS”
ASM is the volume manager and filesystem for Oracle database. At one point of time may need to drop the disks. The procedure is quite different compare to Linux LVM disks. How to delete Oracle ASM disk in RHEL 5 and RHEL 4? Continue reading “How to delete Oracle ASM Disk in RHEL 5 & 4”
On AIX platform, How to install awscli only to current user? In case non-privileged user, Is it possible for the user to do without sudo privileges?
The answer is big fat YES. It is absolutely possible. The AWS documentation may work well for other distribution. But for AIX, it requires to pass few extra arguments along with pip installer. Continue reading “AIX – Install awscli exclusively to current user”
How to get hard disk details such as serial number in HP UX?
Use the command “cstm” to pull the hardware information in HP UX. The same can be used to collect hard disk details such as serial number, make, model and firmware rev of hard disk. The disk serial number mostly needed when replacing faulty hard disks. Continue reading “HP UX – Get hard disk hardware details”
How to upgrade FC HBA firmware and drivers properly?
We were in progress of upgrading IBM SAN SVC version. One of the prerequisite is latest recommended HBA firmware and driver level on host systems. Downloaded and installed the latest firmware & drivers from IBM website. But found server still uses old firmware even after reboot. How to make the new firmware effective? Continue reading “Linux – upgraded HBA firmware not effective”