Secure Web/Mail/Database with certificate
Web/Mail/Database can use the same certificate to allow its client to connect to the server. Postfix: [crayon-686384cca479a051452647/] Dovecot (POP3/IMAP server)…
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Ubuntu: cp copy overwrite without prompting
when you run: cp -rf /source/* /destination , it always ask you to confirm the overwrite action. Root cause: it’s…
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Restrict user to FTP only
### Restrict User to FTP Only: A Guide for Enhanced Security and Access Control In any organization or server setup,…
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Can’t Use apt i.e. /boot is 100% full
NOTE: this is only if you can’t use apt to clean up due to a 100% full /boot 1. Get…
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Dovecot – Iredmail SSL installation
First of all, we need to order a certificate , this certificate is the same with normal web server certificate.…
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Kill all close wait process
We have seen many cases where the client didn’t close the connection correctly, the process is stuck at CLOSE_WAIT status,…
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Auto Restart apache when connection is high
In some situations, our web server receive too many connections. The number is much higher than normal, that could be…
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Nagios: Add new plugin
Nagios config file is in [crayon-686384cca5154231667903/] Nagios plugin script is in [crayon-686384cca5157970898456/]
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Relocation subversion
Command: [crayon-686384cca524c239765110/]
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Sendmail – control who can send relay
Sendmail use “access” database to control who can use this email server to send email out. It’s easy, just edit…