Getting theses output warning on the console when starting or restarting the Postfix daemon? postqueue: warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol postqueue: warning: inet_protocols: configuring for IPv4 support only This mean that Postfix is actually configured to listen on both IPv4 and IPv6 protocols but you do not have… Read More »
Bind (named) DNS server is failing to reload or restart after modifying a domain TXT record? Have a look at your Bind log files (commonly written to /var/log/messages) and you may find the following entries : named: dns_rdata_fromtext: domain.tld.hosts:0: ran out of space named: zone domain.tld/IN: loading master file domain.tld.hosts: ran out of space named:… Read More »
With larger drive these days that exceed 2 Tb, the traditional MSDOS partition table add a barrier of 2 Tb maximum for partitions. Fortunately, the GUID Partition Table which is well known as GPT that push this limit to 18 EB (exabyte). You are probably familiar with the “fdisk” legacy partitioning tool, however this does… Read More »
PHP imagick module is not a part of the default installation yet. Here is some easy steps to enable php-imagick module on your system. 1. First install the required development and dependency packages : yum install make gcc php-devel php-pear ImageMagick ImageMagick-devel 2. Compile php-imagick module : pecl install imagick 3. Add the extension to php.d as followed… Read More »
You probably experienced VPN session disconnection exactly 24 hours after you established the connection. Well, this is an expected behaviour since the OpenVPN Access Server implement a default 24 hours session timeout for user-locked and server-locked profiles. To workaround this limitation, you may set the timeout to a higher value using the following command : /usr/local/openvpn_as/scripts/sacli… Read More »
Whatever you’ve been using Centrify for a month or years on a Linux machine joined to an Active Directory Domain Controller, login using an AD user might suddenly stop work and display the following error message in the system logs (/var/log/message) : adclient[4933]: INFO <bg:ageBindings> base.bind.healing Lost connection to pdc.ad-forest.domain.tld. Running in disconnected mode: KDC refused… Read More »
Starting with Windows Server 2008 R2/2012, the fancy remote management feature may return the following error when adding to your centralized Server Manager console : Computer <NAME> cannot be managed. Verify that the network path is correct, the computer is available on the network and that the appropriate Windows Firewall rules are enabled on the… Read More »
If you have a large amount of data to transfer over the network to another server, Rsync is definately a good way to go. However, since Rsync is using SSH, data encryption can add an extra bottle neck to your speed transfer. You may want to disable encryption if you are transfering locally or if… Read More »
Oracle Cluster File System 2 (well known as OCFS2) is a pretty decent choice when come to chose a filesystem that need to be accessed and written using several server nodes. Unfortunately, RedHat do not support by default OCFS2 in their kernel since they are using GFS instead. I am not aware of any unofficial… Read More »
Having this error on your R1Soft policy for a one or several servers? Error replicating device <PARTITION_MOUNTPOINT> (<PARTITION_UUID>) Protocol error, expected request finished Encountered <0000> read failures! Snapshot failed with error ‘FILE IO ERROR’! An exception occurred during the request. Backup failed due to snapshot error! The next replication will force a full block scan. This is likely… Read More »