C

Canary testing:
- at Google, using a subset of real traffic to test the production performance of a new version
  - https://sre.google/workbook/canarying-releases/
- Elsewhere: serving a release to a predefined test population, as opposed to A/B which is statistics-based
CIDR = Classless Inter-Domain Routing
- A 1993 replacement for the legacy class-based (A, B, C..) IPv4 addressing architecture, replacing the old fixed size network addresses by sizes defined as powers of two, leading to the x.y.z.t/nn notation (1 < nn < 23), describing the number of bits making up the network part in an IP address, starting from the leftmost bits.
- The largest network, with mask /0 covers the entire IPv4 addressing space
- The smallest network, with mask /32 covers a single IPv4 address
- In practice, GCP networks need a minimum of 4 reserved IP addresses, hence 8 to be practical, for a smallest network mask of 32-log2(8) = /29, and the largest network is a /16 for 64 addresses.
- Standardized as RFC 4632
Cloud Load Balancing
- An umbrella product for GCP load balancing offerings
- See Maglev
Compute Engine instance: a VM hosted on Google's infrastructure
- Includes GKE clusters, AppEngine flexible environment instances, and other products build on Compute Engine VMs.
Cascading Failures: when one component fails to work, and alternate systems pick up the load, then get overwhelmed too.
- Protect with degraded results, load shedding, graceful degradation
CFE = Cloud Front End.
- Customer equivalent of GFE.
CNCF = Cloud Native Computing Foundation
Correlated Failures: when related items fail simultaneously
- Reduce impact by containerizing apps and implementing microservices that can run on multiple platforms. Ideally multi-zone or multi-region.