Scalable Infrastructure experts blog.

IN a default installation on NX server root access is disabled. To allow root login just follow those simple steps.

Edit file:
/usr/NX/etc/server.cfg

and substitute line reading

#EnableAdministratorLogin = "0" 
to:
EnableAdministratorLogin = "1"
save the file and exit.

and run in shell as a root user:

/usr/NX/bin/nxserver --useradd root

this is it. Changes will take affect immediately.

Oracle provides a free and public yum server to update it`s Enterprise Linux distribution.
It is easy to set-up and it supports versions 4, 5 and 6.

To set up public repositories for different versions, download configuration file (for ex. with wget)
In Oracle Enterprise Linux 6.x# cd /etc/yum.repos.d # wget https://public-yum.oracle.com/public-yum-ol6.repo In Oracle Enterprise Linux 5.x# cd /etc/yum.repos.d # wget https://public-yum.oracle.com/public-yum-el5.repo In Oracle Enterprise Linux 4, Update 6 or Newer# cd /etc/yum.repos.d# if you have old repo file then: # mv Oracle-Base.repo Oracle-Base.repo.disabled # wget https://public-yum.oracle.com/public-yum-el4.repo
You can verify new configuration with:
#  yum list

And execute update with :
# yum update

Provided by: Forthscale systems, scalable infrastructure experts

How to install Vertica Analytic DatabaseDownload VerticaDownload Vertica RPM from the sitehttp://www.vertica.com/ For this tutorial we are using Community Edition 6.1.2-0, which is the latest version so far. This version has bug, that need to fixed manually in multiple nodes install, the bug will be fixed in next versions.
Server preparationBefore installing Vertica few things must be done on the server and some of the are optional(but strongly suggested). All this steps must be done on all nodes if installing multi node solution.        
Must configurationsInstall Linux OS - we are using Centos 6.4 for this tutorial Check that the server is has at least 1 GB RAM free(minimum for install, we suggest     to have more memory for normal usage) [root@vertica01 ~]# free -m             total       used       free     shared    buffers     cached Mem:          1877        465       1412          0         14        343 -/+ buffers/cache:        106       1770 Swap:         3039          0       3039 …

General InformationPGPool can run on same server along with PostgreSQL DB or on stand alone server(recommended). In this article we will install PGPool on stand alone server, but the only difference is connection ports on PGPool and PostgreSQL. We will install PGPool II 3.1 on PostgreSQL 9.1.


Basic architecture: ┏───────────────┓ │                │ │    pgpool-1    │ │  pgpool server │ │                │ ┗───────────────┛ //             \\ //               \\ //                 \\ \\//                \\// \/                  \/ ┏───────────────┓           ┏───────────────┓ │                │           │                │ │    pgsql-1     │ streaming │     pgsql-2    │ │  pgsql master  │══════════>│  pgsql slave   │ │     server     │replication│     server     │ │                │           │                │ ┗───────────────┛           ┗───────────────┛


Fail cases:Slave failsIn case slave server will fail PGPool will start failover.sh script and will mark server as Down (state 3). I…