Unable to apply DRS resource settings on host. The available memory resources in the parent pool are insufficient for the operation.

Recently I needed decreased the memory reservation from one VM, but after I did that, I received the follow alert in my ESXi host: Unable to apply DRS resource settings on host. The available memory resources in the parent pool are insufficient for the operation. Verifying the swap file of the VM, I observed that […]

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How to create a new Docker image?

In this article we’re going to build one new docker image with Apache and PHP installed and one php file for test. Create a directory called “build”: # mkdir ˜/build Change to directory “build”: # cd ˜/build Create a new file called Dockerfile with the following content: FROM centos MAINTAINER Daniel Nascimento RUN yum update […]

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How to create a new OpenShift Origin user?

Basic Auth is used by default by the OpenShift Origin. So to create a new user account using the below command: #htpasswd /etc/openshift/htpasswd username Environment: OpenShift V2 Centos 6 – 64Bits Reference: http://docs.openshift.org/origin-m4/oo_deployment_guide_comprehensive.html#configure-an-authentication-plugin

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How to Install and set up GitHub on Centos 7

First let’s install Git: # yum install git -y Use the follow commands to add in the required information: $ git config –global user.name “NewUser” $ git config –global user.email newuser@example.com Create a directory called myproject for our workspace environment: $ mkdir myproject/ Change to directory myproject/. $ cd myproject/ Create a new file called […]

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How to disable telnet in AIX

By default the  telnet service is enable in AIX and SSH is not installed, if you installed the SSH, so can you disable telnet service follow below steps: Open the file /etc/inetd.conf: # vi /etc/inetd.conf Comment out the line below to disable to telnet service: #telnet  stream  tcp6    nowait  root    /usr/sbin/telnetd      telnetd -a […]

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LVM – How to migrate data between disks?

Environment: Red Hat Enterprise Linux Server 6.0 Case: You have a server connected in storage A and need migrate the data to new storage B. How to migrate data between disks with the server online? In this article I will explain how migration of data between the disks, without unavailability, remember that in our example […]

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AIX – How to install ProFTP in AIX

This article I explain how to install ProFTP in AIX 6.1, limiting the access only to user home directory. Environment AIX 6.1 ProFTP 1.2.8 FileUtils 4.1.4 Download The package needed can be downloaded in link below: ftp://ftp.software.ibm.com/aix/freeSoftware/aixtoolbox/RPMS/ppc/proftpd/proftpd-1.2.8-1.aix5.1.ppc.rpm The package File Utils is required to install ProFTP, below the link to downloaded if not installed: ftp://ftp.software.ibm.com/aix/freeSoftware/aixtoolbox/RPMS/ppc/fileutils/fileutils-4.1-4.aix4.3.ppc.rpm […]

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Linux – How to find duplicate IP address?

This is a quick tip to find duplicate IP address in your local LAN network. To find duplicate IP address, you can use arping command under linux. Example: #arping -D 192.168.0.10 Output: # arping -D 192.168.0.10 132 ARPING 192.168.0.10 from 192.168.0.2 eth0 Unicast reply from 192.168.0.10 [00:0C:29:2A:3C:C7]  0.896ms Unicast reply from 192.168.0.10 [00:0C:29:55:B7:DB]  0.923ms Where […]

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