OCFS2 File system and Snapshot with REFLINK
OCFS2 is a shared-disk file system designed for use in a cluster environment. It was developed by Oracle Corporation and is included in the Linux kernel. OCFS2 stands for Oracle… Read more »
Tag: Oracle Linux
Oracle UEK7 Oracleasm kernel module has been removed
UEK is a Linux kernel Oracle created to address the needs of customers running demanding software such as Oracle Database on large scale systems. Its focus is performance, stability, and… Read more »
How do fsck at corrupted vm guest in Oracle OVM or Xen Server from vm images.
Hello guys! Sometimes after an incident in Oracle OVM could be that some virtual machines will go in corrupted and it will need to do an fsck about one o… Read more »
Delete unmapped multipath drive: couldn’t get target port group
When we go to delete a lun that is no longer mapped, we may get this error sdXX: couldn’t get asymmetric access stateAfter unmapping the LUN from the SAN storage… Read more »
Apache 2.4 Web Server Hardening and Security Guide
The Web Server is a crucial part of web-based applications. Apache Web Server is often placed at the edge of the network hence it becomes one of the most vulnerable… Read more »
How to display processes using swap space
Identify and print processes using swap space to get a better understanding of the Linux operating system. Display processes using swap space Use the following command to simply display processes… Read more »
Setting and Controlling IP sets using firewalld
Today we see the list of IP set types supported by firewalld, enter the following command as root. ~]# firewall-cmd –get-ipset-types hash:ip hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net hash:mac hash:net hash:net,iface hash:net,net… Read more »
How to disable Transparent Huge Pages on CentOS/RedHat
Hi there! I’d like to show you how to disable Transparent Huge Pages on CentOS/RedHat 7. First question you might ask – why do you even want to disable Transparent… Read more »
Tuning MongoDb for Linux
In this post, we’ll discuss tuning Linux for MongoDB deployments. By far the most common operating system you’ll see MongoDB running on is Linux 2.6,3.x. and 4.x (only Oracle Linux… Read more »
iptables blacklist script
A Bash shell script which uses ipset and iptables to ban a large number of IP addresses published in IP blacklists. ipset uses a hashtable to store/fetch IP addresses and… Read more »