Operating systems

Cause for looping sssd

In RedHat Enterprise Linux 7, the sssd daemons can connect to active directory servers. Default behaviour is to update DNS entries dynamically. If a statical DNS entry already exists this can lead to a CPU consuming sssd_nss daemon.

Compile additional packages for Oracle VM Server

I needed a special package on my OVM Server 3.4.6. The package is called fio and is needed to do some I/O performance tests. Unfortunately, OVM Server does not provide any package for compiling software and installing additional software(…)

Red Hat Enterprise Linux 8 – Application Streams

You may have heard that : Red Hat Enterprise Linux 8 is available for downloading in beta version since few weeks… You want to download it ? Click here. A significant change coming(…)

Monitoring Linux With Nmon

By Mouhamadou Diaw I was looking for tools to monitor linux servers and I found an interesting one nmon ( short for Nigel’s Monitor). I did some tests. In this blog I am describing how(…)

Configure AFD with Grid Infrastructure software (SIHA & CRS) from very beginning.

Introduction : Oracle ASM Filter Driver (Oracle ASMFD) simplifies the configuration and management of disk devices by eliminating the need to rebind disk devices used with Oracle ASM each time the system is restarted. Oracle ASM Filter Driver (Oracle(…)

Kernel panic – not syncing: Out of memory and no killable processes

By Franck Pachot . This is a quick post to give a solution (maybe not the best one as this was just quick troubleshooting) if, at boot, you see something like: Trying to allocate 1041 pages for VMLINUZ [Linux=EFI, setup=0x111f,(…)

Automate OVM deployment for a production ready Oracle RAC 12.2 architecture – (part 02)

In this post we are going to deploy a R.A.C system ready to run production load with near-zero knowledge with R.A.C, Oracle cluster nor Oracle database. We are going to use the “Deploy Cluster Tool” which is provide by Oracle(…)

Automate OVM deployment for a production ready Oracle RAC 12.2 architecture – (part 01)

After having worked with OVM on various architectures I can say that it is a good technology to easily build virtualized environments for production applications. Because it is based on XEN and has simple ways to deal with existing storage(…)

Oracle Linux 7 – How to audit changes to a trusted file such as /etc/passwd or /etc/shadow

Linux auditing is quite powerful and a lot of different use cases might be handled via the auditing framework. However, in this blog I would like to show you, how to audit changes on trusted files, like /etc/passwd or /etc/shadow.

ODA – 32GB template but got a database with 16GB SGA???

I got an interesting question today from a customer which created a database on ODA. He selected the template odb-04 which shows 32GB Memory but got a database with a 16GB SGA… Is it due to the PGA size, a(…)