If you get the following error message in Ubuntu when you use PHP based shell scripts: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20060613+lfs/htscanner.so' - /usr/lib/php5/20060613+lfs/htscanner.so: cannot open shared object file: No such file or directory in Unknown
Postfix: “queue file write error”
If you get an error like: Aug 21 12:41:03 webb4 postfix/sendmail[11234]: fatal: web1_user(12967): queue file write error in your mail log, then the vale for message_size_limit in postfix main.cf is too low. Edit postfix main.cf: vi /etc/postfix/main.cf and set the
Set stricter PHP settings to secure joomla and wordpress installations
If you run a joomla or wordpress installation with mod_php, the following settings in the vhost configuration file or the "Apache directives" field in ISPConfig can be used to set stricter securitypolicys. This helps limit the impact of a possible
Configure fail2ban to use route instead of iptables to block connections
Fail2ban uses iptables by default to block incoming connections when they exceed the max. login retries. The iptables rules used by fail2ban might conflict with the firewall rules, so it might be necessary to reconfigure fail2ban to use the route
Backup and restore mysql databases on the shell
One way to create a backup of a mysql database on the shell is to use the mysqldump command. Mysqldump creates a dump of the database in form of sql commands. Backup mysqldump -u root -p mydatabase > /tmp/backup_mydatabase.sql This
Linux: Get detailed information about server hardware and partitions on the shell
To get detailed information on the CPU, use this command: cat /proc/cpuinfo The output will look similar to this: cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) 64
Linux: How to view log files on the shell?
Many Linux servers are administered on the commandline e.g. with an SSH connection. In the following article, I will explain several shell commands that make it easy to view logfiles. These commands will work on all major Linux distributions inc.
How to speed up logins in pure-ftpd on Debian or Ubuntu Linux by disable name resolving
If you experience problems with slow logins in pure-ftpd, this is often caused by a problem with the resolving of the clients hsotname. This happens e.g. when you run a FTP server in your intranet and the hostname of the
How to renew SSL certificates for courier pop3 and imap server on Debian or Ubuntu?
This articles describes the renewal of SSL certificates for courier pop3 and imap server. This is nescessary e.g. when the certificates are expired or contain the wrong hostname. First delete the exsiting certificates: rm -f /etc/courier/imapd.pem rm -f /etc/courier/pop3d.pem Then
How to enable verbose logging in pure-ftpd on Debian Linux
To turn on verbose logging (e.g. to debug FTP connection or authentication problems) in pure-ftpd FTP server on Debian and Ubuntu Linux, execute the following command as root user in the shell: echo 'yes' > /etc/pure-ftpd/conf/VerboseLog and then restart pure-ftpd,
