Perform Connectivity Check between Nodes
Action:
Check connectivity from the first node to each of the other nodes, using the Ping command .
Check connectivity from node 0 to each of the other nodes, using the SSH command.
Diagnosis:
| n | Ping is unreachable. |
| n | Unable to SSH from Node 0 to the other nodes. |
Resolution:
Perform these additional checks:
| n | Segmentation between the 3 nodes. |
| n | FW or any other networking component between nodes. |
| n | Other SSH traffic is allowed to pass in the segment. |
Perform Internet Connectivity Check
Action:
Perform an internet connectivity check, using the following command:
#curl https://votiroregistry.azurecr.io/v2/ -v
Diagnosis:
| n | cURL command returns a timeout response. |
Resolution:
If there is a proxy, configure it and check connectivity, using the following command:
#curl -x 'http://USER:PASSWORD@PROXY' -v https://votiroregistry.azurecr.io/v2/
Note
USER:PASS is for a proxy that requires authentication.
After PROXY you should add port: PROXY_IP:PROXY_PORT
If there is no proxy and no internet connectivity, disable Safebrowsing.
Verify Network Configuration and Unique Hostname for each Node
Action:
To verify your network configuration, use the nmtui tool.
Check the hostname, using the following command:
#hostname.
Check the IP address using the following command:
#ip addr | grep ens160.
Diagnosis:
| n | Hostnames configured with uppercase or underscore. |
| n | Hostnames are not configured – all hostnames are the same. |
| n | IP addresses were not configured. |
Resolution:
If the hostnames or IPs are not unique, configure using the command #nmtui
| 1. | Edit a connection. |
| 2. | Set up IPv4 Configuration to be Manual, click Show. |
| 3. | Add Address, Gateway, DNS servers. |
| 4. | Click OK, then click Back. |
| 5. | Set the system hostname (you may use the FQDN) (all lowercase, numbers and “–“): |
| 6. | Quit the nmtui. |
| 7. | Restart the machine, using the following command: |
#reboot.
Once the machines are back up, check the hostname and IP again to confirm the change.
Check Disk Speed
Action:
To check the disk speed, use the healthcheck script. The disk speed check is embedded towards the end of the output on your screen.
Connect to each node, then use the following command:
#hdparm -Tt /dev/sda
The output you should receive is as follows:
Diagnosis:
| n | The hdparm command is not found. |
| n | OVF for Version 9.3 or earlier, does not have the utility built-in. |
Resolution:
If there is internet connectivity, manually install hdparm, using the following command:
#sudo yum install hdparm
During the install you will be prompted to proceed with the install, enter Y.
The expected output for hdparm is at least the values in the screenshot in the Action section above. In case you get lower results, check the type of disks being used in the environment, and what competing activity there is on the host.
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