Cluster 6. Putting all devices hostnames and IP addresses to the /etc/hosts

Three different networks are used in our cluster:

1. BCN (Back-Channel Network - 10.0.53.nodeIP/24) for cluster management traffic, IPMI, switches - node names will be as  agrp-c01n01.bcn
1. IPMI IP will be - 10.clusterSerialNumber*10.53.nodeIP*10+1/24 (i.e. 10.10.53.11)
2. switch stack Ip will be - 10.clusterSerialNumber*10.53.nodeIP*10+2/24 (i.e. 10.10.53.12):
1. access stack and execute:
2. int vlan 100
3. ip address 10.10.53.12 255.255.255.0
4. ip address 10.10.53.22 255.255.255.0 secondary
5. do sh int vlan 100
2. SN (Storage Network - 10.0.52.nodeIP/24) - node names will be as - agrp-c01n01.sn
3. IFN (Internet-Facing Network - 10.0.51.ServerIP/24) - only for servers (virtual servers, hosted on a node) - node names will be as - agrp-c01n01.ifn

connect IPMI iLOes agrp-c01n01 goes to 1/0/17 and agrp-c01n02 to 2/0/17 - Back-Channel Network - 10.clusterSerialNumber*10.53.nodeIP/24 => 10.10.53.[12]0

Put below lines to the  /etc/hosts (it will be the same on both nodes):

### Nodes 

# agrp-c01n01

10.10.53.1    agrp-c01n01.bcn agrp-c01n01

10.10.53.11  agrp-c01n01.ipmi

10.10.52.1    agrp-c01n01.sn

172.16.51.1    agrp-c01n01.ifn

# agrp-c01n01

10.10.53.2    agrp-c01n02.bcn agrp-c01n02

10.10.53.21  agrp-c01n02.ipmi

10.10.52.2    agrp-c01n02.sn

172.16.51.2    agrp-c01n02.ifn

# Network Switches
10.10.53.12 agrp-stack01

10.10.53.22 agrp-stack01

Save and exit, verify with ping script. This script will ping every host in /etc/hosts file and then will display ping result showing how many packets are send, received and packet loss:
for name in $(grep -E "^(172|10)" /etc/hosts | awk '{print $2}');
do
   echo "NAME=$name";
   ping $name -c 3 | grep "packet loss";
   echo "";
done

Only ping to agrp-c01n01.ipmi & agrp-c01n02.ipmi must response "Destination Host Unreachable" because we haven't yer set up IPMI

This tutorial was used to understand and setup clustering: AN!Cluster