Virtualization And Cloud Computing
Disclaimer: The content and comments are personal and not related to my employer.
Wednesday, August 11, 2021
Replacing vROPS Certificates
Wednesday, March 3, 2021
vCloud Usage Meter 4.3 DNS settings is not updated after the UM 4.3 ovf Deployment
Issue: I had multiple occasions where the UM 4.3 is deployed using ovf template and DNS settings are provided during the deployment and later checked DNS settings rollbacks to default IP address
Actions Performed :
1.Accesses the /op/vmware/share/vami/vami_config_net and updated the DNS settings but still it rollback to default DNS IP address
2. Added the DNS domain server in /etc/resolv.conf file but after the reboot the DNS IP address is not persistent
Cause: We found the resolv.conf is pointing to runtime symbolic which is making not persistent after reboot
Workaround 1:
- Take an SSH/ console onto the Usage Meter appliance, and run the below commands.
- mv /etc/resolve.conf /etc/resolve.conf.bak
- vi /etc/resolve.conf
- chmod 644 resolve.conf
- Key in the DNS server info in the below format. I have attached a screenshot below.
- nameserver DNSIPAddress1
- nameserver DNSIPAddress1
- Quit out of the file, and perform a reboot.
- Navigated to the file: /etc/systemd/network/10-eth0.network
- vi /etc/systemd/network/10-eth0.network
- Added the DNS entries
- Reboot the Appliance or restart the network by running systemctl restart systemd-networkd
- post which the DNS settings is persistent
Tuesday, January 26, 2021
Usage Meter 4.3 Fails to connect to vRNI (Network Insight) fails with API ERROR
Usage Meter v4.3 is not able to connect to vRealize Network Insight (vRNI v5.1.0). Product status in UM = collection error Message Notification = Collection error: APIError
Sunday, December 27, 2020
Unable to add vCenter to Usage Meter 3.6 after replacing the vCenter certificate
Issue: Unable to add the vCenter endpoint to the usage meter due to certificate error
Error: There was a problem checking the certificate vCenter fqdn:443 .Unexpected exception :java.net.UnknownHostException:fqdn of vCenter
Actions performed:
1.Checked the root certificate on the vCenter and machine SSL ,SAN names etc
2. Running an openssl command from Usage meter using the IP address of the vCenter returns the certificate
3. Running and opnessl command from Usage meter using the vCenter FQDN fails to resolve and unable to fetch the vCenter certificate.
Resolution :
1.SSH into the Usage Meter appliance using root
2.Took a backup of /etc/hosts file
3.Added the IP address and the FQDN of the vCenter after which vCenter was successfully added to the Usage Meter.
Thursday, August 6, 2020
Top 20 articles for vRealize Operations Manager
Handy KB articles for recent issues in vROPS
- How to reset the root password in vRealize Operations
- How to reset the admin password in vRealize Operations Manager
- Adding additional storage to a node in vRealize Operations
- vRealize Operations Manager Sizing Guidelines
- Configure a Certificate For Use With vRealize Operations
- /storage/log is full on vRealize Operations
- Replace expired internal certificate in vRealize Operations Manager 6.3 and later
- Upgrade to vRealize Operations Manager 8.0 fails due to the admin or root account password
- Upgrade to vRealize Operations Manager 8.0 hangs on step 4 of 9
- Shutdown and Startup sequence for a vRealize Operations Manager cluster
- Clearing the Alerts and Alarms Tables in vRealize Operations
- Upgrade to vRealize Operations Manager 8.x fails due to low space on /dev/sda
- Upgrade to vRealize Operations Manager 8.0 fails due to low space on /dev/sdc
- Continuous disk space alerts for /storage/archive Guest File System in vRealize Operations Manager
- Rebooting nodes in vRealize Operations Manager
- Minimum Collection User Permissions in vRealize Operations Manager 6.x and later
- How to take a Snapshot of vRealize Operations
- Change the IP Address of a vRealize Operations Manager Multi Node Deployment
- vRealize Operations Data Collection
- Reload the default certificate in vRealize Operations Manager
Monday, July 20, 2020
Using Custom Certificates in Usage Meter 4.x
As we get to move on with customers and service providers asking to implement to use a secure web browser access to Usage Meter .The old versions of UM has methods to replace the certificates.
Beginning from 3.6.1 versions there is no official or supported methods to use a custom certificates for Usage Meter and we are still allowed with default certificates.
Recently we are receiving request from customer using their own internal or custom signed certificates for Usage Meter 4.x versions. It still in the road map and i believe it will be taken care in the upcoming versions.
I have tested in my lab since the Usage Meter 4.x version uses ngnix web servers so i found a possibility to replace the certificates.
Note: Its official not supported and no supported documentation available at this moment and you have to repeat ever time you upgrade or patch the Usage Meter appliance make sure to take a snapshot or a valid backup before performing the steps
• Please take a snapshot of the Usage Meter Appliance
• Once you have the certificate and the key file generated from your CA
• Access the Usage Meter appliance via SSH using the root account
• Take a backup of the crt and key files from the location and copy the new crt and key files to
• ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt
• ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key
• Edit the configuration file
vi /opt/vmware/cloudusagemetering/conf/nginx.conf to match the crt and key location
Replacing vROPS Certificates
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