Category: Computer Tips

1. Follow instruction in http://fedoraproject.org/wiki/Openvpn to set up OpenVPN server on the gateway node of your private network, and OpenVPN client on your external nodes that need to access the NFS server inside the private network behind your OpenVPN server node; 2. Start the OpenVPN server and clients, in each client nodes, add custom route […]

Once you have your Java installed, in /usr/java/jre1.6.0_29* cd /usr/lib64/firefox-3.*/plugins ln -s /usr/java/jre1.6.0*/lib/amd64/libnpjp2.so libnpjp2.so Then restarted Firefox and once loaded, java will be working in your browser!

Have you ever tried to delete a file and noticed that it turned into a .nfs file? This is because some process still has an open file handle on this file. The .nfs file is typically named .nfs followed by a bunch of digits eg. .nfs000000000189806400000085. To identify the actually process which has the open […]

According to R manual, http://cran.r-project.org/doc/manuals/fullrefman.pdf, page 411, ” Value A character vector of length one. Both leading and trailing spaces and tabs are stripped from the result. In non-interactive use the result is as if the response was RETURN and the value is “”. ” So, if you have an R script that used readline […]

gconftool-2 –config-source xml:readwrite:/etc/gconf/gconf.xml.defaults –direct –type bool –set /apps/gdm/simple-greeter/disable_user_list true

Dell Server Admin: 1311 3Ware Server Admin: 888 APC Admin: 6547

The system will drop you into a shell after  asking you root password. However, you cannot correct /etc/fstab since / is readonly. Now you need to do $ mount -o remount,rw / to enable it.  Then you are free to correct it.

The rpc.idmapd malfunctioned. Cure: service rpcidmapd restart Work in: RHEL6 Also, check /var/log/message of the client to see which domain it expects. If you see line as rpc.idmapd[10199]: nss_getpwnam: name ‘user@domain’ does not map into domain ‘some_domain’ you’d go to the server and add line Domain = some_domain under the [General] section of /etc/idmapd.conf and […]

Redhat always recommends to reinstall from scratch for a major version upgrade of its RHEL system. However, if you have a highly customized system with plenty third party softwares and non-standard settings, even if you have a full record of all customer settings, it will still be a big job, days, and aftermath to have […]

add option fastboot in grub.