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Canary Deployments

Using the ring-balancer, target weights can be adjusted granularly, allowing for a smooth, controlled canary release.

Using a very simple two target example:

# first target at 1000
curl -X POST http://localhost:8001/upstreams/address.v2.service/targets \
    --data "target=192.168.34.17:80"
    --data "weight=1000"

# second target at 0
curl -X POST http://localhost:8001/upstreams/address.v2.service/targets \
    --data "target=192.168.34.18:80"
    --data "weight=0"

By repeating the requests, but altering the weights each time, traffic will slowly be routed towards the other target. For example, set it at 10%:

# first target at 900
curl -X POST http://localhost:8001/upstreams/address.v2.service/targets \
    --data "target=192.168.34.17:80"
    --data "weight=900"

# second target at 100
curl -X POST http://localhost:8001/upstreams/address.v2.service/targets \
    --data "target=192.168.34.18:80"
    --data "weight=100"

The changes through the Kong Gateway Admin API are dynamic and take effect immediately. No reload or restart is required, and no in progress requests are dropped.