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this quick and simple article, we will install wget command on a CentOS 6.7 server and we have included a wget cheat sheet. Wget is a free software package for downloading files using HTTP, HTTPS and FTP. Prerequisites A CentOS 6.7 server with Root privileges, if you do no have a server and would […] private network connectivity for servers running at the same location. But sometimes you want two servers in different countries / datacenters to be able to communicate in a private and secure way. This tutorial will show you how to achieve that with the help of OpenVPN. The operating systems used here are Debian and CentOS, […] This is one of the best command that facilitates the system admin to perform his specific tasks. Below is the list with the examples showing the paste command. [localhost@localhost ~]$ cat file1 apple orange mango banana [localhost@localhost ~]$ cat file2 coldplay westlife michael sunibigyana piyush [localhost@localhost ~]$ paste -s file1 apple orange mango banana [localhost@localhost […] Sending SMS Notifications From Nagios In my last article I have discuses how to install Gnokii for sending/receiving SMS from your computer. Today I’ll explain how we are using Gnokii + Nagios for sending SMS notifications to our cell phones. Its a great way to get notify of the problems while on road. I assume […] TOP 10 largest file # find /var -type f -ls | sort -k 7 -r -n | head -10 FIND FILES MORE THAN 5Gb # find /var/log/ -type f -size +5120M -exec ls -lh {} \; Find all temp files older than a month and delete: # find /usr/home/admin/Maildir/new -mtime +30-type f | xargs /bin/rm […] Postfix – whitelisting and spf filtering The whitelist will allow me to manually allow any mail servers to bypass the spf filtering and RBL(Real-time Blacklists) lists. What does SPF filtering do? Suppose a spammer forges a Hotmail.com address and tries to spam you. They connect from somewhere other than Hotmail. When his message is sent, […] Postfix – Blocking spam before it enters the server Posted in DNSBL E-mail E-mail spam Extended SMTP Mail transfer agents Postfix Spam filtering When i first setup the server part 1 and part 2 i used the basic setting for postfix but soon found that i could reduce the amount of spam and load on […] 1. list content of file myfile # [localhost@localhost ~] $ cat myfile apple orange mango banana GUAVA ra dish pineapple 2. delete the first line of the file # [localhost@localhost ~] $ sed ‘1d’ myfile orange mango banana GUAVA ra dish pineapple 3. delete the third line of the file # [localhost@localhost ~] $ sed […] See the list of interfaces on which tcpdump can listen # /usr/sbin/tcpdump -D Listen on any available interface # /usr/sbin/tcpdump -i any Verbose Mode # /usr/sbin/tcpdump -v # /usr/sbin/tcpdump -vv # /usr/sbin/tcpdump -vvv # /usr/sbin/tcpdump -q Limit the capture to an number of packets N # /usr/sbin/tcpdump -c N Display IP addresses and port numbers […] To Check Postfix Queue #mailq To Check Sasl Auth #tail -f /var/log/messages|grep sasl To Check Posfix Logs #tail -f /var/log/maillog|grep postfix List of domains that are being deferred #qshape-maia -s deferred Checking Specific Mail From Queue ————————————— To view the full mails #postcat -q D5EB71AEA45 If you an error postcat: fatal: open queue file D5EB71AEA45: […] |
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