Mitigating Common CloudStack Instance Deployment Failures - Jithin Raju - ShapeBlue

Dec 1, 20231 like734 views

A discussion on the common failures when using CloudStack taking instance deployment as an example. The session includes 15 specific failure scenarios, their causes, and possible mitigation steps. ----------------------------------------- The CloudStack Collaboration Conference 2023 took place on 23-24th November. The conference, arranged by a group of volunteers from the Apache CloudStack Community, took place in the voco hotel, in Porte de Clichy, Paris. It hosted over 350 attendees, with 47 speakers holding technical talks, user stories, new features and integrations presentations and more.

Mitigating Common
CloudStack Instance
Deployment Failures
Jithin Raju
jithin.raju@shapeblue.com

About Me
• Cloud Architect at ShapeBlue
• Involved with CloudStack/ Forks
since 2013.
• Citrix > Accelerite > ShapeBlue

Agenda
Common CloudStack Instance
Deployment Failures
Q&A
Discussion

Insufficient
Capacity
Capacity is fully utilized
Add
Add more Capacity
(Compute/Storage).
Delete
Delete unused
instances and volumes.
Resource
Resource limits
Monitor
Monitor utilization

Insufficient
Address Capacity • Add new public IP
address range/subnet.
Add
• Resource limits.
Resource
• Plan capacity well
Plan
Public IPs are fully allocated

Unable to allocate
vnet Extend the VLAN range
Resource Limits on Networks
Plan capacity well.
Guest VLAN range in the zone fully utilized

Tag Mismatch Review
Review the
configuration.
Add
Add the tag to
more hosts/
storage.
Avoid Avoid using tags
if not required.
The host / Storage tag is not configured
correctly.
Tagged host/storage are fully utilized.

Overconfidence
with over
provisioning Use realistic values.
Thorough testing.
Leave headroom.
Higher used capacity compared to allocated
capacity

Deployment
options
Avoid using
combinations
which can’t
be deployed.
Reduce the
choices
Conflicting choices

No destination found
for a deployment for
VM instance Ensure
Host/Hardware
Health.
Ensure free
capacity.
Hypervisor
monitoring.
Hosts are disconnected
Lost vCenter access
No Free Capacity

Capability
Mismatch
Revise the compute offerings
along with hardware changes.
Review compute offerings.
Unable to find hosts with a suitable number
of vCPUs, CPU MHz, or any other
specification in the compute offering.

Resource Limits
Increase the limit. Free up resources.
Resource limit on account or domain for
instance, volumes, primary storage,
public IPs, and networks.

Null Pointer
Exceptions
Avoid DB
modifications.
Apply fixes. Report/ Fix
bugs.
Manual DB changes
Cloudstack bugs.

Database Errors Monitor Monitor the server.
Connectivity
Ensure good
connectivity to
Database.
MySQL
Use tested and
supported MySQL
versions.
DB Server performance
JDBC Errors.
Errors executing statements.
DB server filesystem filled up.

Instance not
booting
Fix the guest OS
mapping.
Use supported
controller types.
Fix the
template.
Incorrect Guest OS mapping.
Unsupported controller type.
Corrupted template/ISO.

Timeouts
Update timeouts to
match the environment
and use cases.
Identify the sub-task
causing the delay.
Review underlying
platform performance.
“Wait” timeouts
Job timeout

Issues with VR
Inspect the VR. Restart the network
with clean-up.
Fix / Report bug.
Unresponsive VR.
Filesystem filled up.
Unreachable VR.
Storage issues.
Cloudstack bugs.

Session Description: A discussion on the common failures when using CloudStack taking instance deployment as an example. The session includes 15 specific failure scenarios, their causes, and possible mitigation steps. Speaker Bio: For work, Jithin is a cloud architect at ShapeBlue. Jithin has helped organisations around the globe use commercial distributions of Apache CloudStack in the past 10 years. --------------------------------------------- On Friday 18th August, the Apache CloudStack India User Group 2023 took place in Bangalore, seeing CloudStack enthusiasts, experts, and industry leaders from across the country, discuss the open-source project. The meetup served as a vibrant platform to delve into the depths of Apache CloudStack, share insights, and forge new connections.

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