Continental Innovates with Rancher and Kubernetes
The environment key can be used to customize system services. When a value is not assigned, RancherOS looks up the value from the rancher.environment key.
rancher.environment
In the example below, ETCD_DISCOVERY will be set to https://discovery.etcd.io/d1cd18f5ee1c1e2223aed6a1734719f7 for the etcd service.
ETCD_DISCOVERY
https://discovery.etcd.io/d1cd18f5ee1c1e2223aed6a1734719f7
etcd
rancher: environment: ETCD_DISCOVERY: https://discovery.etcd.io/d1cd18f5ee1c1e2223aed6a1734719f7 services: etcd: ... environment: - ETCD_DISCOVERY
Wildcard globbing is also supported. In the example below, ETCD_DISCOVERY will be set as in the previous example, along with any other environment variables beginning with ETCD_.
ETCD_
rancher: environment: ETCD_DISCOVERY: https://discovery.etcd.io/d1cd18f5ee1c1e2223aed6a1734719f7 services: etcd: ... environment: - ETCD_*
Available as of v1.2
There is also a way to extend PATH environment variable, PATH or path can be set, and multiple values can be comma-separated. Note that need to reboot before taking effect.
PATH
path
rancher: environment: path: /opt/bin,/home/rancher/bin