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January | 2012 | Nasser Heidari
https://linax.wordpress.com/2012/01
8212; Nasser Heidari @ 23:39. Bash supports a surprising number of string manipulation operations. If you use bash in your daily work, I’m pretty sure you will find these operations many useful and handy. 1 Counting Arguments: ${#}. You need to know with how many parameters the script was invoked. Use the shell built-in variable ${#}. 2 String Length: ${#parameter}. 31 Shortest Substring Match: ${parameter#word}. Deletes the shortest match of word from front of parameter. You can find more Information an...
linax.wordpress.com
Varnish cache Security – Removing Default Headers | Nasser Heidari
https://linax.wordpress.com/2011/01/27/varnish-cache-security-removing-default-headers
Varnish cache Security – Removing Default Headers. 8212; Nasser Heidari @ 16:47. If you want to completely remove your varnish cache footprints on HTTP Headers, flow this:. Sub vcl deliver { . . remove resp.http.X-Varnish; remove resp.http.Via; remove resp.http.Age; remove resp.http.X-Powered-By; unset obj.http.Server; set obj.http.Server = "Go Away";. Sub vcl error { . . unset obj.http.Server; set obj.http.Server = "Go Away";. 2 Comments ». Sorry always get your blog post personal information on linux.
techinternets.com
SFTP Only Chroot Jail (OpenSSH v6) - Technology of the Internets
http://www.techinternets.com/chrootjailv6
SFTP Only Chroot Jail (OpenSSH v6). This tutorial is a follow-up to the version 6. Update of OpenSSH. Since version 5, jailing has been natively supported. This tutorial is for attempting to jail users to their home directory and allowing them ONLY. This works and has been tested on centos 6.3. This will majorly increase security for a multi-user server. The main things it does are:. Lock users to their home directory. Disable regular ssh access. FTP already does this! This tutorial uses the /opt directo...
linax.wordpress.com
Centos TimeZone Resets to default !!! | Nasser Heidari
https://linax.wordpress.com/2011/05/15/centos-timezone-resets-to-default
Centos TimeZone Resets to default! 8212; Nasser Heidari @ 19:49. Recently I have Installed and configured a server Based on CentOs , after a while I noticed that My TimeZone Configuration resets to default after I Update server, I configured timezone again using this command:. Ln -sf /usr/share/zoneinfo/UTC /etc/localtime. It worked again for a while and then I noticed again it has been changed to default config Again! After a little googleing i find out that it is related to my configuration file here:.
linax.wordpress.com
Nasser Heidari | Page 2
https://linax.wordpress.com/page/2
MySQL fatal error 1236. 8212; Nasser Heidari @ 17:09. Mysql show master status;. Mysql STOP SLAVE;. Query OK, 0 rows affected (0.00 sec). Mysql FLUSH TABLES WITH READ LOCK;. Query OK, 0 rows affected (0.00 sec). Mysql UNLOCK TABLES;. Query OK, 0 rows affected (0.00 sec). Mysql CHANGE MASTER TO. MASTER HOST=’DB-1′,. MASTER USER=’replication’,. MASTER LOG FILE=’bin.007733′,. MASTER LOG POS=824963644;. Query OK, 0 rows affected (0.00 sec). Mysql start slave;. Query OK, 0 rows affected (0.00 sec). 65534) {pr...
linax.wordpress.com
February | 2014 | Nasser Heidari
https://linax.wordpress.com/2014/02
MySQL: Which table is eating my Disk Space? 8212; Nasser Heidari @ 12:45. If you are using mysql with innodb engine without files per table, and want to know which table is eating your disk space… here is the the way I have checked today:. Also if you want to find Size of each Database the:. Mysql select table schema, concat(round(sum(data length index length)/(1024*1024*1024),2),'G') SIZE FROM TABLES GROUP BY table schema ORDER BY sum(data length index length) desc;. Security Tips and Issues (10).
linax.wordpress.com
Block POST Method with VARNISH for Invalid URLS | Nasser Heidari
https://linax.wordpress.com/2011/01/27/block-post-method-with-varnish-for-invalid-urls
Block POST Method with VARNISH for Invalid URLS. 8212; Nasser Heidari @ 16:38. Recently, I’ve experienced very high load on my http server because of spam bots. After some inspection on the server using tools like varnishtop. Tcpdump, apache mod log post. I’ve realized that Web Server receives lots of invalid POST Requests. As I have only few forms on the Web Server that uses POST method, I decide to Block ALL POST method REQUESTS except my forms , lets say the form urls is :. 2 Comments ». Notify me of ...
linax.wordpress.com
August | 2012 | Nasser Heidari
https://linax.wordpress.com/2012/08
Freeradius – Problem with rlm perl. 8212; Nasser Heidari @ 13:46. There is a problem in debian/ubuntu that when you use rlm perl module, freeradius will fail to start. Root@debian:/etc/freeradius# /etc/init.d/freeradius restart. Stopping FreeRADIUS daemon: freeradius/var/run/freeradius/freeradius.pid not found…. At /usr/lib/perl5/DBI.pm line 265. BEGIN failed–compilation aborted at /usr/lib/perl5/DBI.pm line 265. Compilation failed in require at /etc/freeradius/dump.pl line 2. What am I doing…. Pantzorg ...
linax.wordpress.com
July | 2012 | Nasser Heidari
https://linax.wordpress.com/2012/07
Freeradius – check nested ldap group membership. 8212; Nasser Heidari @ 15:23. If your organization have lots of users and groups , you also may use nested groups. For example, UserA is a member of SalesGroup, and SalesGroup is a member of VPN Group. I want all members of VPN GROUP able to connect to VPN Server. if you use normal groupmembership filter in your ldap module , then UserA will not be able to authenticate as he is not a member of VPN Group. Read more here about ldap search filters.
linax.wordpress.com
Packet Lost on Linux Server ! | Nasser Heidari
https://linax.wordpress.com/2011/02/05/packet-lost-on-linux-server
Packet Lost on Linux Server! 8212; Nasser Heidari @ 13:05. Today Our NOC team report packet lost on my Linux server, I start to check problem by pinging my server from connected router and got this result :. Router#ping linux-server repeat 1000. Type escape sequence to abort. Sending 1000, 100-byte ICMP Echos to linux-server, timeout is 2 seconds:. Success rate is 97 percent (579/596), round-trip min/avg/max = 1/1/4 ms. After login to server , I saw this messages on syslog :. To increase this limit :.
