In these days i’m working on a new Catalyst Center project where i need to replace an active DN2-HW single-node appliance with a DN3-HW three-node cluster. To achieve this goal i decide to create and upgrade the cluster in my company lab and then i will restore the last backup from the single-node appliance when i will install the new cluster to the customer datacenter.
Obviously i cannot use the customer network settings in my lab otherwise i will never reach the Cisco public catalog server useful for the system upgrade but i need to find a way to modify those network setting after the initial setup.
To accomplish this task i can follow 2 different ways:
- SSH to the node subsystem
- Use the server CIMC
SSH to the node subsystem
Catalyst Center use a Linux subsystem you can access to, using a special username called “maglev” and specific tcp port 2222. The system let you run some typical maintenance commands:
$ ?
Help:
cat concatenate and print files in restricted mode
clear clear the terminal screen
date display the current time in the given FORMAT, or set the system date
debug enable console debug logs
df file system information
dmesg print or control the kernel ring buffer.
du summarize disk usage of the set of FILEs, recursively for directories.
free quick summary of memory usage
history enable shell commands history
htop interactive process viewer.
ip print routing, network devices, interfaces and tunnels.
last show a listing of last logged in users.
ls restricted file system view chrooted to maglev Home
lscpu print information about the CPU architecture.
magctl tool to manage a Maglev deployment
maglev maglev admin commands
maglev-config tool to configure a Maglev deployment
manufacture_check tool to perform manufacturing checks
netstat print networking information.
nslookup query Internet name servers interactively.
ntpq standard NTP query program.
ping send ICMP ECHO_REQUEST to network hosts.
ps check status of active processes in the system
rca root cause analysis collection utilities
reboot Reboot the machine
rm delete files in restricted mode
route print the IP routing table.
runonce Execute runonce scripts
scp restricted secure copy
sftp secure file transfer
shutdown Shutdown the machine
ssh OpenSSH SSH client.
tail Print the last 10 lines of each FILE to standard output
top display sorted list of system processes
traceroute print the route packets trace to network host.
uname print system information.
uptime tell how long the system has been running.
vi text editor
w show who is logged on and what they are doing.
The command we need to update our system settings is “sudo maglev-config update”, after that a CLI wizard will appear and will guide you through the change process:
Use the server CIMC
Sometimes yon cannot access the maglev subsystem via SSH (e.g. your firewall blocks the connections to port tcp 2222) so you can access the UCS CIMC interface and launch the vKVM:
the KVM (Kernel-based Virtual Machine) will show you the maglev subsytem and, once you are in, let you run the “sudo maglev-config update” command:
Maglev-config wizard
Starting from this point, the wizard is the same for both the ways and it will prompt you all the settings you can change divided by pages. Here you can chenges network adapter settings (enterprise port, intracluster port, management port, internet port), the cluster fqdn and virtual ip address, ntp settings:
Once the process is over you will receive a confirmation message:
