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switch_discovery.rst

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For switch based hardware discovery, the servers are identified through the switches and switchposts they are directly connected to.

Switch info:

Switch name: switch1
Switch username: xcat
Switch password: passw0rd
Switch IP Address: 10.0.201.1
Switch port for Compute Node: port0

Predefined Nodes

In order to differentiate one node from another, the admin needs to predefine node in xCAT database based on the switches information. This consists of two parts:

  1. Predefine Switches <predefined_switches_label>
  2. Predefine Server Node <predefined_server_nodes_label>

Predefine Switches

The predefined switches will represent devices that the physical servers are connected to. xCAT need to access those switches to get server related information through SNMP v3.

So the admin need to make sure those switches are configured correctly with SNMP v3 enabled. <TODO: The document that Configure Ethernet Switches>

Then, define switch info into xCAT:

nodeadd switch1 groups=switch,all
chdef switch1 ip=10.0.201.1
tabch switch=switch1 switches.snmpversion=3 switches.username=xcat switches.password=passw0rd switches.auth=sha

Add switch into DNS using the following commands:

makehosts switch1
makedns -n

Predefine Server node

After switches are defined, the server node can be predefined with the following commands:

nodeadd cn1 groups=powerLE,all
chdef cn1 mgt=ipmi cons=ipmi ip=10.0.101.1 bmc=50.0.101.1 netboot=petitboot installnic=mac primarynic=mac
chdef cn1 switch=switch1 switchport=0

[Optional] If more configuration planed to be done on BMC, the following command is also needed. :

chdef cn1 bmcvlantag=<vlanid>                 # tag VLAN ID for BMC
chdef cn1 bmcusername=<desired_username>
chdef cn1 bmcpassword=<desired_password>

In order to do BMC configuration during the discovery process, set runcmd=bmcsetup. :

chdef cn1 chain="runcmd=bmcsetup"

[Optional] More operation plan to do after hardware disocvery is done, ondiscover option can be used.

For example, configure console, copy SSH key for OpenBMC, then disable powersupplyredundancy :

chdef cn01 -p chain="ondiscover=makegocons|rspconfig:sshcfg|rspconfig:powersupplyredundancy=disabled"

Note: | is used to split commands, and : is used to split command with its option.

Set the target osimage into the chain table to automatically provision the operating system after the node discovery is complete. :

chdef cn1 -p chain="osimage=<osimage_name>"

For more information about chain, refer to Chain <../../../../../advanced/chain/index>

Add cn1 into DNS:

makehosts cn1
maekdns -n

Verify node definition

The following is an example of the server node definition after hardware discovery:

#lsdef cn1
Object name: cn1
    arch=ppc64
    bmc=50.0.101.1
    cons=ipmi
    cpucount=192
    cputype=POWER8E (raw), altivec supported
    groups=powerLE,all
    installnic=mac
    ip=10.0.101.1
    mac=6c:ae:8b:02:12:50
    memory=65118MB
    mgt=ipmi
    mtm=8247-22L
    netboot=petitboot
    postbootscripts=otherpkgs
    postscripts=syslog,remoteshell,syncfiles
    primarynic=mac
    serial=10112CA
    supportedarchs=ppc64
    switch=switch1
    switchport=0