Use the following PHP code to send emails from your server:
$mail_to=”destination@address.com”;
$mail_subject=”Hello”;
$mail_from=”yourname@yourdomain.com”;
$mail_body_client=”Hello”;
mail($mail_to,$mail_subject,$mail_body_client,”FROM:”. $mail_from);
where,
$mail_to is the receipent.
$mail_from is the sender.
How to check number of connections to the Apache server?
netstat command will show you the accurate connections to each of your service. In order to check the number of connections to port 80, use the netstat command and grep the Apache port.
List the connections to port 80:
netstat -alntp | grep :80
To check the number of connections to port 80:
netstat -alntp | grep :80 | wc -l
List the remote IPs connecting to your server on port 80:
netstat -alntp | grep :80 | awk ‘{print $5}’ | cut -d: -f1 | sort
List the uniq remote IPs and the number of connections from each IP:
netstat -alntp | grep :80 | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
Please note: If you copy paste the above commands on your server, the single quote around the {} brackets may change to dots (.) and the command will fail, so make sure you replace those dots with the singe quote and execute the command.
If you receive the error message “vzquota : (error) Quota is running, stop it first” while restarting a VPS, you will first have to turn off it’s quota and then drop it
vzquota off VEID
vzquota drop VEID
Once done, restart the VPS and it will re-initialize the quota for the VPS and will start the VPS. If the problem persist, remove the /var/vzquota/quota.veid file
rm -f /var/vzquota/quota.veid
and then start the VPS. This should also display the correct disk space used by the VPS.
You may have notice packet drops when CSF firewall is enabled and you are downloading something. The only reason is the option
PACKET_FILTER = “1”
By default the “PACKET_FILTER” is ON which drops packets that looks illegal or out of sequence. If it’s generating false alarms and causing the valid packet to drop, you should better turn OFF the option in /etc/csf/csf.conf file
PACKET_FILTER = “0”
Save the file and restart CSF firewall.
“Got a packet bigger than ‘max_allowed_packet’ bytes”
The message is displayed when you try to restore a database and the packet size if more than the default one OR the one defined in the my.cnf file.You can check the existing bytes with the following command
root@server [~]# mysqladmin variables | grep max_allowed_packet
| max_allowed_packet | 1048576 |
To overcome the issue, add the following parameter in the my.cnf file
max_allowed_packet = 2097152
The value should be more than the default one. Save the file and restart the mysql service.