VMware workstation 11 on Ubuntu 15.04 high cpu utilization solved

VMware 11 workstation on Ubuntu with windows guests freezes from time to time with very high cpu utilization. The process vmware-vmx and khugepaged get 100% cpu time for a couple of seconds. The khugepaged is the process that configures the transparent hugepages. When i disable the transparent hugepages windows guest run without freezes again. To disable it on every operating system start up i put in /etc/rc.local

Ansible playbook to provision a WebLogic Fusion Middleware Domain on RHEL/CentOS 7

I created a playbook for Ansible to provision a WebLogic server, install Fusion Middleware Infrastructure software and create a Domain with a managed server in a RHEL 7 Linux System. (CentOS 7 and Oracle Linux 7 are supported too)

Error accesing EM 12c Cloud Control weak ephemeral Diffie-Hellman public key

After Chrome and Firefox browsers get some security updates i cannot access the Oracle Enterprise Manager 12c console. The browser (Chrome 45.0.2454.85 on Ubuntu 15.04)  reported that:

Server has a weak ephemeral Diffie-Hellman public key

ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY

Improve performance on virtualized RHEL 7 server using tuned

Tuned is a dynamic adaptive system tuning daemon that tunes system settings dynamically depending on usage. You can configure tuned in RHEL 6/7 systems (and CentOS, Oracle Linux etc) using tuned-adm witch is the commandline tool for switching between different tuning profiles.

Installing EPEL Repository to Oracle Linux 7

Extra Packages for Enterprise Linux (or EPEL) is a Repository that holds high quality extra packages that Red Hat Enterprise Linux (RHEL) base distributions (like Oracle Linux 7) does not include. Installation of EPEL in Oracle Linux 7 is simple. We need to download and install an rpm package that EPEL provides.

jdeveloper 12c (12.1.3) is crashing on ubuntu 15.04 with unity

Jdeveloper 12c and especially version 12.1.3 is crashing when used with unity on Ubuntu 15.04. The problem is JAyatana a package for integrate swing applications with unity that is installed by default in 15.04.

Btrfs disable copy on write (cow) for virtual machine disks

In files like vmware virtual disks (vmdk files) is common to disable copy on write (cow) on btrfs filesystems to avoid system slow response due to heavy I/O on disks.

You can verify if a file have disabled the copy on write using lsattr command. If you see a C on the file attributes the copy on write is disabled.