Netscaler High Availability A high availability (HA) deployment of two NetScaler appliances can provide uninterrupted operation in any transaction. With one appliance configured as the primary node and the other as the secondary node, the primary node accepts connections and manages servers while the secondary node monitors the primary. If, for any reason, the primary node is unable to accept connections, the secondary node takes over.
The secondary node monitors the primary by sending periodic messages (often called heartbeat messages or health checks) to determine whether the primary node is accepting connections.
Issue: vcenter certificate replaced. From thereon, Citrix studio cant connect to vcenter. Power control options grayed out in director and studio doesn’t show power options at all.
Troubleshooting: Hypervisor tests on the vcenter server url in studio->hosting tab, show that studio cant connect to vcenter because of certificate issue.
Solution:
Goto your vcenter url: https://vcenter.domain.com on IE, download the certificate in DER encoded cert format. Install it to trusted people, select show physical stores.
Issue: Citrix VDA is not registered.
Troubleshooting:
Checked Citrix services on the VDI. Citrix ICA service wasnt started. Throws error, “windows could not start the citrix ica service on local computer 1067” and fails to start.
Solutions:
On the VDI, check if authenticated users group is added to local administrators group. If you find it, remove it. Start ICA service and other citrix services. Restart citrix desktop service. On the VDI, check if local service account is added to local administrators group on the VDA.
Those who are on IOS 14 OS might have seen below prompt when opening apps. VNC Viewer is an example shown here. In IOS 14 we see similar prompt for almost all apps.
If you do not allow access for these apps to your local network, they wont work. In case if you have disabled access, goto settings, select the app and enable local network option.
While upgrading or installing linux OS from one version to another you might end up in below error. In my case, I tried to install linux mint 20 (Ulyana), and faced the error. Note: I have already disabled secure boot in my laptop.
I have downloaded Linux mint 20 ISO from their website and made it bootable with Rufus software (MBR partition scheme and BIOS or UEFI target system). Attached USB to laptop and installed Linux Mint 20.
When you try to add a vcenter connection under “Hosting” tab in Studio, you get the below error sometimes: Solution:
Open your vcenter server in IE, like, https://vcenterServer.yourcompany.com. You will see certificate error. Click on “Continue to this Website (not recommended). Click on Certificate error in the address bar. Click View certificates and install the certificate. Make sure you install it to Local machine and select “Trusted People” in certificate store dialog box.
Azure important points:
Use locks on critical resources. Use resource groups to segregate your resources into virtual groups so that they can be managed as a single entity. Create policy to set compliance and rules on your Azure resources. Use Initiatives if you have multiple policies. Even if you have a single policy today, It is recommended using initiatives. This will be helpful in future if you create more number of policies.
Azure Learning Links:
Azure Docs: https://docs.microsoft.com/en-us/learn/browse/
AZ-900:
https://docs.microsoft.com/en-us/learn/paths/azure-fundamentals/
https://github.com/ddneves/awesome-azure-learning/blob/master/topics/certifications/az-900.md
https://azure.microsoft.com/en-ca/community/events/ - Change country and select course.
https://microsoft.github.io/AzureTipsAndTricks/
Windows Virtual Desktop:
WVD Introduction: https://docs.microsoft.com/en-us/learn/paths/m365-wvd/
Youtube playlist: Azure Academy
When users complain that they are experiencing slowness in their VDIs, there are some points to check within in citrix.
If you have Citrix ADM (Application Delivery Management) installed and configured, you should see users sessions and bandwidth details in ADM. You may see high ICA RTT even though users say that they have very good internet plan. They always try to download a file or stream a YouTube video in HD and say, my internet is good.
Here are few recommendations to save money on azure:
Reduce costs by eliminating unprovisioned Azure ExpressRoute circuits. Buy reserved instances to save money over pay-as-you-go. Right-size or shutdown underutilized virtual machines. Use Reserved Instance.Choose low-cost locations and regions. Right-size underutilized virtual machines. Deallocate virtual machines in off hours. Delete unused virtual machines. Migrate to PaaS or SaaS services. Use right size VMs. Azure Hybrid Benefit for Windows Server and SQL Server Use Dev/Test subscription offers Bring your own SQL Server license Use SQL Server Developer Edition for non-production use
