September 2020
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Adding Multiple SMTP servers : Customizing selector on OpenDKIM

Recently one of my friends is setting up mutliple outbound SMTP servers for his project. But He does not have enough domain access and his primary domain is already being using another DKIM Keys (default._domainkey) for business email purpose.

His challenge is to seup another trusted outbound email server without affecting the primary Email configuration.


NRPE : krb5.h:2690:24: error: et/com_err.h: No such file or directory

While I’m installing nrpe (Nagios Client) on a server I got a strange error as shown below, I’m using CentOS 6.4 (64 bit) linux.

/usr/include/krb5/krb5.h:2690:24: error: et/com_err.h: No such file or directory In file included from /usr/include/krb5.h:7,                  from /usr/include/openssl/kssl.h:72,                 […]

Running multiple Glassfish instances in a server

One of the client to want to use 3 Glassfish environment for his Dev,QA and UAT purpose. He does not wish to pay separate servers for these low priority application roles.

System requirements

1. Have more RAM (16GB is fine) and medium computing power 2. 3 static IP for 3 environments 3. Glassfish installation.


configure: error: C compiler cannot create executables

While I’m installing nagios 1.4.14 version on a new server, I got the following errors,

[root@fc-db02 nagios-plugins-1.4.14]# ./configure checking for a BSD-compatible install… /usr/bin/install -c checking whether build environment is sane… yes checking for a thread-safe mkdir -p… /bin/mkdir -p checking for gawk… gawk checking whether make sets $(MAKE)… yes checking build system type… x86_64-unknown-linux-gnu […]

Running multiple PHP versions on Apache

One of the old project can be run only on php 5.2 version and further development is happening on the same version. This project hosted in a dedicated WHM/Cpanel server. Unfortunately we will not get the php 5.2 option in EasyApache as they deprecated that version. Php5.3 or later cab be available there. So I […]

Postfix : Quick setup of authenticated SMTP server

Today one of my friends asked me to provide information/assistance to how to setup authenticated smtp server for sending email remotely. He is planning to use this server as a bulk email marketing server.

Here is the easy setup to configure an authenticated SMTP server within 10 minutes. Here I’m using system user account to […]