VMware Server performance can be improved in so many ways… there are some recomendation that I’ve discovered when I was using this product at large before moving them to ESXi : Use preallocated virtual disk Use as less virtual hardware as possible – do not add unneeded hardware Use ext4 or XFS filesystem (if host… Read More »
VMware allow four type of virtual disk (vmdk) : 0 : single growable virtual disk 1 : growable virtual disk split in 2Gb files 2 : single preallocated virtual disk 3 : preallocated virtual disk split in 2Gb files vmware-vdiskmanager -r <source-disk> -t <type> <target-disk> Now, if you want to convert your growable disk into… Read More »
Do the following to find and replace text string in a whole file using the Vi text editor : 1. Enter in command mode by typing ” : ” 2. Your command should look like this : :%s/search_for_text/replace_with_this_text/g NOTE : To search & replace a string containing slashes ” / “, use a coma ”… Read More »
Trying to import a MySQL dump and/or starting mysqld return the following error : [ERROR] bdb: fatal region error detected; run recovery [ERROR] Fatal error: Can’t open and lock privilege tables: Table ‘host’ is read only Probably the MySQL database directory does not have the right privileges. The permission scheme should look like this :… Read More »
When trying to connect to a MySQL 4.x and later server, the following error occur : DB connection error: mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWORD(‘your_existing_password’). This will store a new, and more secure, hash… Read More »
When trying to open a page through HTTPS, you receive this error : SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long) This is probably due to a vhost IP mismatch/configuration error. The virtual host does not have the right IP address.
By default, the submission port is TCP-587. To change to another value, edit the following file : /var/qmail/supervise/submission/run And simply change the port number just before the last line : /usr/bin/tcpserver -v -R -H -l $HOSTNAME -x $TCP_CDB -c “$MAXSMTPD” \ -u “$QMAILDUID” -g “$NOFILESGID” 0 587 \ $SMTPD $VCHKPW /bin/true 2>&1 Of course, you… Read More »
Query refused shown on system log. unexpected RCODE (REFUSED) resolving ‘vhost.domain.tld/A/IN’: xxx.xxx.xxx.xxx#53 This indicate that one of your forwarders deny to resolve the query. You should remove/comment it.
Directory permission problem shown in system log when starting named. named[xxxx]: the working directory is not writable Owner as well as group should be “named” and both have “read-write-execute” (775) mode. sudo chmod g+w named
You may see the following notice in the system log. You need to raise the max open file in both system limit file and named configuration. Edit /etc/security/limits.conf and add : named soft nofile 4096 Inside the /var/named/chroot/etc/named.conf, add in the option section : files 4096;