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Author Archives: blogger
VMware and Windows poor TCP performance
I have had a strange issue lately with Windows servers on VMware vSphere 5.1 hosts. Throughput of TCP connections between some virtual machines were very very slow, barely 10 mbit/s . The behavior was easily reproducible : just start an … Continue reading
Posted in Computer, Microsoft, Virtualization, VMware
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Using Windows domain resources while VPN is active with different credentials
If you are frustrated to get your Domain account locked while you are logged on a VPN with different credentials than your Domain credentials, then this is for you. Edit the file %userprofile%\AppData\Roaming\Microsoft\Network\Connections\Pbk\rasphone.pbk with your favorite text editor. All the … Continue reading
Posted in Computer, Microsoft, Networking
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Exim GnuTLS Diffie-Hellman errors
I have been getting increasing number of errors in my Exim log related to GnuTLS Diffie-Hellman prime number. That prime number being too small causes Exim to abort the connection and initiate a new one to send the email over … Continue reading
rsyslogd auto-configuration
To have rsyslogd automatically create directories and files with whatever you send at it, just put this in your rsyslog.conf file (or a .conf file in /etc/rsyslog.d): # provide UDP syslog reception $ModLoad imudp $UDPServerRun 514 $template DynFile,”/var/log/syslogs/%fromhost-ip%-%fromhost%/%$YEAR%-%$MONTH%-%syslogfacility-text%” # log … Continue reading
Active Directory export script to import into SME Server
I had to migrate users from an Active Directory/Exchange combo to a SME server for temporary disaster recovery event. Here’s the script I wrote to create the export and recreate the users and their aliases in the SME server. The … Continue reading
VMware vCSA 5.1 password expiration
A few months ago, I was unable to login on my vCSA. At that time, I thought it ws a glitch, I rebooted (didn’t fix the issue) and changed the password of the users, which fixed the issue. Recently, I … Continue reading
Posted in Computer, Linux, Virtualization, VMware
Tagged security, suse, vcenter, vcsa
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Nagios and Exim queue size
A simple script to check Exim queue size for Nagios NRPE: #!/bin/bash #arg1 = warning count #arg2 = critical count if [ -z “$1” ] || [ -z “$2” ] then echo “Usage: ${0} warningcount criticalcount” else if … Continue reading
Ubuntu “reboot” on Supermicro X9SCI/X9SCA shuts down
On two recent Supermicro servers, typing reboot actually shuts down the server. Thanks to Google and this blogpost, major.io/2013/06/03/supermicro-x9scix9sca-server-does-a-shutdown-rather-than-a-reboot/ no longer have this issue. Short story: just blacklist the module named “mei” and you’re good.
Posted in Computer, Linux
Tagged 12.04.4, reboot, shutdown, supermicro, ubuntu, x9sca, x9sci
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Mikrotik DHCP and PXE boot
If you want to boot with DHCP/PXE/TFTP method and your DHCP is handled by a Mikrotik router and your TFTP server is on another server, then you need to set the next-server and boot-file-name parameters in the network definition. Do … Continue reading
Posted in Computer, Linux, Mikrotik, Networking
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LSI Megaraid Storage Manager and VMware ESXi
I had to configure a bunch of ESXi 5.1 servers with LSI 9240-4i hardware RAID controllers the other day. This RAID controller is perfectly supported in ESXi 5.1 but it lacks the monitoring features. To have these, you need to … Continue reading
Posted in Computer, Networking, Virtualization, VMware
2 Comments