Linux How to use, Tutorials and scripts; Guides

To check php extension grep extension /usr/local/lib/php.ini ==================================== php -m | grep -i mcrypt grep -i mcrypt /usr/local/lib/php.ini ============================== Would you be able to uninstall and reinstall Source Guardian on the server to see if the error ceases to occur? Code: /scripts/phpextensionmgr uninstall SourceGuardian /scripts/phpextensionmgr install SourceGuardian

Now you've download the template for your virtual machine. You can just start a VPS based on the template you have just downloaded, by typing the following commands: # vzctl create 10 --ostemplate ubuntu-9.04-x86_64 vzctl set 10 --onboot yes --save ### Set IP for VPS ### vzctl set 10 --ipadd 192.168.1.5 --save ### Set Nameservers IP for VPS ### vzctl set 10 --nameserver 192.168.1.111 --save vzctl set 10 --nameserver 192.168.1.111 --save ### Set Hostname IP for VPS ### vzctl set 10 --hostname vps.nixcraft.in --save ### Set Disk quota for VPS (10G min [soft] and 11G max hard limit) ### vzctl set 10 --diskspace 10G:11G --save ### Okat let start it ### vzctl start 10 ### Set root user password for VPS ### vzctl exec 10 passwd vzctl is used to create and set various vps properties such as memory, disk usage and much more. Where,     create 10 : Your VPS ID.     --ostemplate ubuntu-9.04-x86_64 : VPS template.  ...

To login (from unix shell) use -h only if needed. # [mysql dir]mysql  -u username -p Create a database on the sql server. mysql> create database [databasename]; List all databases on the sql server. mysql> show databases; Switch to a database. mysql> use [db name]; To see all the tables in the db. mysql> show tables; To see database’s field formats. mysql> describe [table name]; To delete a db. mysql> drop database [database name]; To delete a table. mysql> drop table [table name]; Show all data in a table. mysql> SELECT * FROM [table name]; Returns the columns and column information pertaining to the designated table. mysql> show columns from [table name]; Show certain selected rows with the value “whatever”. mysql> SELECT * FROM [table name] WHERE [field name] = “whatever”; Show all records containing the name “Bob” AND the phone number ’3444444′. mysql> SELECT * FROM [table name] WHERE name = “Bob” ...

Exim Commands Introduction: Here are some useful things to know for managing an Exim  server. Message-IDs and spool files. The message-IDs that Exim uses to refer to messages in its queue are mixed-case alpha-numeric, and take the form of: XXXXXX-YYYYYY-ZZ. Most commands related to managing the queue and logging use these message-ids. There are three -- count 'em, THREE -- files for each message in the spool directory. If you're dealing with these files by hand, instead of using he appropriate exim commands as detailed below, make sure you get them all, and don't leave Exim with remnants of messages in the queue. Files in /var/spool/exim/msglog contain logging information for each message and are named the same as the message-id. Files in /var/spool/exim/input are named after the message-id, plus a suffix denoting whether it is the envelope header (-H) or message data (-D). These directories may contain further hashed subdirectories to deal with larger...

IPTABLES:- =================== To open a port in iptables:- iptables -A INPUT -p tcp --dport 3306 -j ACCEPT iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT We can go ahead and break this down: -A tells the IP table to append a rule to the table. INPUT designates this rule as part of the Input chain. -m conntrack followed by the --cstate ESTABLISHED,RELATED guarantees that the result of this rule will only apply to current connections and those related to them are allowed -j ACCEPT tells the packet to JUMP to accept and the connections are still in place. Let’s assume that we want to block all incoming traffic, except for those coming in on 2 common ports: 22 for SSH and 80 for web traffic. We proceed by allowing all traffic on the designated ports with the following commands:  iptables -A INPUT -p tcp --dport ssh -j ACCEPT  iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --destination-port 6881:6999 -j ACCEPT...

It has become popular now days to receive incoming attack from foreign server, with the only goal to discard all access/connections to your server. Those attacks are generally call “DoS” or “Denial of Service” attack. SYN flood or SYN attack is a denial-of-service method affecting hosts that run TCP server processes. The attack takes advantage of the state retention TCP performs for some time after receiving a SYN segment to a port that has been put into the LISTEN state. The basic idea is to exploit this behavior by causing a host to retain enough state for bogus half-connections that there are no resources left to establish new legitimate connections (RFC4987). SYN flood is relatively hard to mitigate, and that's why very popular. Why? It often uses random source IPs which cannot be banned, as they are generated in each packet; It consumes little resources on the attacker side and lots of on the victim’s; The protection is quite complex, full of nuances and req...

[root@openfire~]# rpm -ivh openfire-3.7.1-1.i386.rpm  Now it's time for database, you can use your desired database like, mssql, oracle etc... i  use MySQL for this tutorial. Let's install MySQL thencreate a database named 'openfire' and an user 'admin'. If you want feel difficult with external databases, you can also use the embedded database. [root@openfire~]# yum install mysql-server [root@openfire~]# mysql -u root -p Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> create database openfire; Query OK, 1 row affected (0.00 sec) mysql> create user admin@localhost identified by 'passwd'; Query OK, 0 rows affected (0.00 sec) mysql> grant all on openfire.* to admin@localhost identified by 'passwd'; Query OK, 0 rows affected (0.00 sec) DB has been created just  check it by logging in to  it with specified user to confirm. [root@openfire~]# mysql -u admin -p ...