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.
In the example below, ETCD_DISCOVERY
will be set to https://discovery.etcd.io/d1cd18f5ee1c1e2223aed6a1734719f7
for the etcd
service.
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_
.
rancher:
environment:
ETCD_DISCOVERY: https://discovery.etcd.io/d1cd18f5ee1c1e2223aed6a1734719f7
services:
etcd:
...
environment:
- ETCD_*
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.
rancher:
environment:
path: /opt/bin,/home/rancher/bin