Author: gunnalag

Web Technologies

FIX: WordPress upgrade stuck up in maintenance mode

Scenario: You are upgrading WordPress site from 4.4.2 to the latest 4.6.1 Your WordPress site hosted on a Windows Server running the IIS You have chosen and setup the FTP Connection to download the update files on the local server itself Upon clicking update to WordPress 4.6.1, you’ll see the upgrade is able to download, unpack the installer files.  However,  the upgrade just remains on the step of “Enabling Maintenance Mode..” There is NO .maintenance file existing in your WordPress root path Solution: This behaviour results since upgrade process being unable to create the .maintenance file under your WordPress root […]

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Networking, Unix Technologies

Setup and Test Bind DNS Zone File Replication to Slave Servers on CentOS

Scenario: You are on-boarding/bringing up a new Bind DNS server (say NSHost3 – 198.164.12.103) to replace/upgrade your existing Bind DNS server (NSHost2 – 198.164.12.102) You have installed Bind 9.8 as shown on the new server [root@NSHost3 ~]#  named -vBIND 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.1[root@NSHost3 ~]# You want to configure NSHost3 as slave server for some of the zones are primarily hosted on NSHost1 (198.164.12.101) in your other Data centre You are NOT running or have allowed the tcp/udp port#53 in your iptables Firewall on both NSHost1 and NSHost3 servers   Implementation: Configuring your new server NSHost3 as slave to NSHost1 server requires updating named.conf […]

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Citrix, Networking, Unix Technologies

FIX: CentOS 6.8 Minimal Install: Device eth0 does not seem to be present, delaying initialization

Scenario: You are running your CentOS virtual machine on XenServer with a Static IPv4 IP-Address. All of sudden your CentOS system loses network connectivity. Upon checking you notice that none of the Network adapters are detected.  The IP-address assigned gets allocated to other systems on the network. Upon attempting to run command ‘service network restart’, you encounter error message: Bringing up interface eth0: Device eth0 does not seem to be present, delaying initialization. [FAILED] You notice that Same error persists even when you add more NICs to the system Same error persists even when you remove or manually update MAC […]

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