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Code Issues Projects Releases Wiki Activity

Update to bring back mention of container links compatibility

pull/31331/head
Yashodhan Mohan Bhatnagar 2022-01-24 01:56:44 +05:30
parent 36336334c3
commit 12653d2266
1 changed files with 1 additions and 3 deletions
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content/en/docs/concepts/services-networking/service.md
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@ -450,9 +450,7 @@ variables and DNS.
### Environment variables ### Environment variables
When a Pod is run on a Node, the kubelet adds a set of environment variables When a Pod is run on a Node, the kubelet adds a set of environment variables
for each active Service. It supports both granular variables like `{SVCNAME}_PORT_{SVCPORT}_PROTO` and more (see [makeLinkVariables](https://github.com/kubernetes/kubernetes/blob/dd2d12f6dc0e654c15d5db57a5f9f6ba61192726/pkg/kubelet/envvars/envvars.go#L72)) for each active Service. It adds `{SVCNAME}_SERVICE_HOST` and `{SVCNAME}_SERVICE_PORT` variables, where the Service name is upper-cased and dashes are converted to underscores. It also supports variables (see [makeLinkVariables](https://github.com/kubernetes/kubernetes/blob/dd2d12f6dc0e654c15d5db57a5f9f6ba61192726/pkg/kubelet/envvars/envvars.go#L72)) that are compatible with Docker Engine's "_[legacy container links](https://docs.docker.com/network/links/)_" feature.
as well as simpler `{SVCNAME}_SERVICE_HOST` and `{SVCNAME}_SERVICE_PORT` variables,
where the Service name is upper-cased and dashes are converted to underscores.
For example, the Service `redis-master` which exposes TCP port 6379 and has been For example, the Service `redis-master` which exposes TCP port 6379 and has been
allocated cluster IP address 10.0.0.11, produces the following environment allocated cluster IP address 10.0.0.11, produces the following environment