R71 IT Blog

Issue: No DNS lookups for external domains anymore, resolving internal domains works correctly Error: "(network unreachable) resolving 'dlv.isc.org/DNSKEY/IN" Solution: check the current date and time on the server and adjust it. Issue: DNS requests for FQDN's outside of my LAN are not resolved anymore. Error: Jun 16 18:41:11 alpedhuez named[13832]: validating @0x7f32c43d00a0: . NS: got…

Just now I got this error when trying to enable HA on a cluster with two ESXi4 hosts:"Cannot complete the configuration of the HA agent on the host. Other HA configuration error." When experiencing HA configuration issues there are a couple of steps I usually take to try to fix the experienced issues: Click “reconfigure…

CMAKE ———- yum install gcc-c++ libX11-devel libXext-devel libXtst-devel libXinerama-devel wget http://www.cmake.org/files/v2.8/cmake-2.8.4.tar.gz tar xfvz cmake-2.8.4.tar.gz ./configure gmake gmake install Centreon Engine ————— yum install gcc-c++ qt4-devel cmake make useradd -m centreon groupadd centreon usermod -a -G centreon centreon cd /tmp wget http://www.centreon.com/downloads/centreon-engine.tar.gz tar xzf centreon-engine.tar.gz cd centreon-engine cd build cmake -DWITH_USER=centreon -DWITH_PREFIX=/usr/local/centengine -DWITH_TEMP_DIR=/usr/local/centengine/tmp -DWITH_GROUP=centreon -DWITH_CHECK_RESULT_DIR=/usr/local/centengine/var gmake…

# Kickstart file generated by Roderick Derks. # Centos 5.6 #version=DEVEL install url –url http://freenas02.r71.nl:8080/Centos_5.6/cd1/ lang en_US.UTF-8 keyboard us timezone –utc Europe/Amsterdam rootpw  –iscrypted $6$AFQ9hKwPBKDUZwXd$E9nM0G2GBa4h2wDoG3D4mbK/fhpg.ER0RovPd4c5zKLHXjv7APZ7/rDAcDSvpFa2CBqq9rEdyZHYw/eY13EON. selinux –disabled authconfig –enableshadow –passalgo=sha512 –enablefingerprint firewall –enabled –ssh –http #ask for network config during installation #network –device=eth0 –bootproto=query reboot bootloader –location=mbr –driveorder=sda –append="acpi=off" clearpart –linux –drives=sda part /boot –fstype…

* yum install tftp-server * vi /etc/xinetd.d/tftp and change disable to 'no' and check root path for tftp server disable = no server_args = -s /tftpboot * restart xinetd service xinetd restart * Install syslinux yum install syslinux * Copy needed files from syslinux to the tftpboot directory cp /usr/share/syslinux/pxelinux.0 /tftpboot cp /usr/share/syslinux/menu.c32 /tftpboot cp…

This article is based on my own performance measurements using the passmark tool. Hyper-Threading gives you a 15% to 20% performance gain on "common" VM's. Some CPU intensive applications which are not multi-threaded build can suffer badly from Hyper-Threading functionality. I think this is because a physical CPU core is split and delivers 50% of…

This article is mainly to prepare myself for possible upcoming certification renewals. Zimbra ZCS 7.0.x requires a valid self-signed or commercial SSL certificate for communication between some components. The self-signed certificates that are automatically created by the ZCS install have a default expiration of 365 days. If you have an ZCS installation that is over…

To do that, on the server : run "wbemtest" click on "connection" and type "root\cimv2" click on "enumerate classes" and type "Win32_PerfRawData". Press "ok"   You should see a list of all Win32_PerfRawData WMI classes on the server. If you wan to find MSSQL WMI information make sure that you see a bunch of "Win32_PerfRawData_MSSQL{Instance}_MSSQL{Instance}"…