Ubuntu package manager has multiple tools to list the available package updates for installed deb packages. Look into all options and choose the one which you feel comfort. Among given options, first two option are my favourite. Because they populate list of available package updates with version details. Continue reading “Ubuntu – List available package updates”
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”
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”
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”
This simple script gives you the list of FC HBA detected in system. It query the sysfs filesystem to get the available fibre channel HBA. Script works for most of the Linux flavors, as specially any of Redhat, SUSE, Fedora and Centos distributions. Continue reading “Linux get the list of FC HBA’s and WWPN”
The ldapsearch command used to query the required information from LDAP databases. The ldapsearch command can be used on many occasions with different filter statement. Various ldapsearch command examples and use cases with advanced options discussed here.
Note: Replace the password ($PASS) and ROOTDN with your server values. You may need to specify LDAP URI and authentication methods depend upon configuration. Here i am working from LDAP server.
Filter user with UID
Look for the users with given UID value. This command list the users whoever UID set to 20005. Continue reading “ldapsearch command examples with advanced options”
On VMware virtual machine hot added new virtual network interface (NIC). The newly added network interface is of VMXNET3 type. Initially kernel named the new network interface as “eth0”. Post server reboot network interface device name changed from “eth0” to “rename2”. But the other existing network interface name remains same as “eth1”.