Compute nodes Installation
Compute nodes Installation: 1.Login to the frontend as root; 2.Run a program which capture a compute node DHCP requestes and put their information into the Rocks MySQL database:
# insert-ethers
If the frontend and compute nodes are connected via a managed ethernet switch,select “Ethernet Switches”.”Insert-ethers” is waiting for new compute nodes.Power up the first compute node,when the frontend machine receives the DHCP request from the compute node,it indicates that insert-ethers received the DHCP request from the compute node,inserted it into the database and update all configuration files.
When reinstalling very large clusters,load is managed on the frontend by telling compute nodes to back off and retry if the server is too busy.Specially,if the number of concurrently running kickstart.cgi processes exceeds some threshold,the fronted will send a “negative acknowledge” in the form of 503 http error signal.When a compute node receive this signal,it takes a reasonable action and retries its installation later.While the load threshold is reasonable for most clusters,it may be adjusted in the /opt/rocks/etc/kcgive file.Once adjusted,the value is used immediately.
Crossing kickstart:Contain nodes of different hardware architectures.
Mount the CD’s as ISO format:
# mount -o loop *.iso /mnt/cdrom