7,186 reputation
11936
bio website alerque.com
location Izmir, Turkey
age 32
visits member for 4 years, 8 months
seen 2 days ago

I am a scripting language connoisseur, regular expression aficionado, network geek, general lover of Linux and a frequent contributor to open source software. I transitioned to programming from other work because I was too busy automating my own work environment to actually do the other work. I have a hobby interest in cartography. For more see my personal site. Most importantly, my life is defined by the grace of God given to men through Jesus Christ. It is my ambition that everything I do would reflect His glory and point people towards Him.


Feb
24
awarded  Enlightened
Feb
24
awarded  Nice Answer
Dec
6
revised Amazon EC2 AutoScaling WordPress
deleted 52 characters in body
Aug
23
comment Is a reboot required after edit/saving linux iptables?
If you have something that is not "taking effect" it's because you have entered the rules in the wrong order. First match wins. If you have a block rule that matches, the packet will get dropped even if some rule you added later allows it. You need to specifically allow the things you want before you deny everything else. You may need to flush the tables and start over if you have to change the order of something you've already entered. You can also specifically delete rules form the table and added them back in the right order.
Aug
23
comment Is a reboot required after edit/saving linux iptables?
A reboot actually CLEARS all iptables rules. On first boot the tables will always be empty, you ALWAYS have to set all the rules after booting. That's what the iptables-save helper script thing does ... takes all the current rules and dumps them to a file that can then get re-run on the next boot. Rebooting doesn't make anything take effect, it actually forgets EVERYTHING. If you run iptables -L to list what is in the tables, whatever is there is what is being enforced that instant. This is very easy to prove in practice.
Aug
23
answered Is a reboot required after edit/saving linux iptables?
Aug
16
answered Does Amazon AWS block multiple connection from the same IP?
Aug
15
awarded  Excavator
Aug
6
revised linux system resource analyzer
deleted 11 characters in body
Aug
6
revised grep pattern matching for case insensitivity
Don't use references to "above" or "bellow" in answers because their order changes with time and votes!
Aug
5
comment grep to display folders which contain files which contain a string
You could potentially save a lot of time using the -l argument to grep so it stops reading through files after it finds a match and moves on. That's easy. Some of the more complex answers here are a whole 'nother level more efficient because they stop scanning a directory after the first match is found.
Aug
4
comment Two servers using same name servers?
@ChrisMuench: Did these clowns actually answer your question?
Aug
4
answered Two servers using same name servers?
Aug
4
comment How to test /etc/rc.d/rc.local to make sure a command will start successfully at boot?
Has it ever started up properly or is this your first try? Does it require any special shell environment variables that might be present in a login shell but not in the init environment?
Aug
4
comment How to test /etc/rc.d/rc.local to make sure a command will start successfully at boot?
+1 There is a lot of wisdom in this. No matter how many things you think you've done right, there is no substitute for actual testing.
Aug
2
revised netcat throughput low but iperf high
deleted 75 characters in body
Aug
2
answered netcat throughput low but iperf high
Aug
2
comment rsync “Operation not permitted”
Hm. You could use --no-owner to not try to set the owner to match. (FAT has no owner property) and possible --no-perms as well.
Aug
2
answered rsync “Operation not permitted”
Aug
2
comment rsync “Operation not permitted”
Running mount | grep /mnt/exthd should tell you.