SMTP use TLS/SSL to secure connection to server and AUTH so only authenticated user can use the SMTP service. This tutorial will show steps to debug SMTP TLS/SSL and AUTH from Linux/Unix terminal.

1. encode your login information in base64, the following perl command which requires MIME::Base64 will …

Linux LVM is a logical volume manager for Linux kernel. Logical volume manager provides method of allocation space in mass storage device that more flexible than traditional partitioning scheme. Logical volume manager can create, resize, and combine partitions, potentially without interrupting …

When using iSCSI and LVM, sometimes we have to manually enable iSCSI disk that used as a physical volume in LVM. This is because LVM service is started earlier than iSCSI service so the iSCSI disk containing the physical volume is not present yet. Solution to this problem is to enable lvmetad in …

Install packages using FreeBSD port.

1. Install postfix

# Options for postfix-2.11.0,1
_OPTIONS_READ=postfix-2.11.0,1
_FILE_COMPLETE_OPTIONS_LIST=BDB CDB INST_BASE LDAP_SASL LMDB MYSQL NIS OPENLDAP PCRE PGSQL SASL2 SPF SQLITE TEST TLS VDA DOVECOT DOVECOT2 SASLKRB5 SASLKMIT
OPTIONS_FILE_SET+=BDB …

In this short tutorial I will show how to check TCP/UDP open port or services in FreeBSD box. For checking open port or services which uses port in FreeBSD simply issue the following commands.

1. check TCP connection

   sockstat -Ptcp
   

2. check UDP connection

   sockstat -Pudp
   

   Combine with grep to search …

DRBD refers to block devices designed as a building block to form high availability cluster. This is done by mirroring a whole block device via an assigned network. DRBD can be understood as network based RAID-1. (DRBD)

Sometimes we have a disk failure on hard drive which contains DRBD backing …