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Update debug-service.md --- add ipvs part on kube-proxy (#8652)

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Weibin Lin
2018-05-22 00:38:51 +08:00
committed by k8s-ci-robot
parent 314084404d
commit 3953da98b0
1 changed files with 18 additions and 2 deletions
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content/en/docs/tasks/debug-application-cluster/debug-service.md
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@@ -459,8 +459,8 @@ One of the main responsibilities of `kube-proxy` is to write the `iptables`
rules which implement `Services`. Let's check that those rules are getting
written.
The kube-proxy can run in either "userspace" mode or "iptables" mode.
Hopefully you are using the newer, faster, more stable "iptables" mode. You
The kube-proxy can run in "userspace" mode, "iptables" mode or "ipvs" mode.
Hopefully you are using the "iptables" mode or "ipvs" mode. You
should see one of the following cases.
#### Userspace
@@ -500,6 +500,22 @@ There should be 1 rule in `KUBE-SERVICES`, 1 or 2 rules per endpoint in
per endpoint, and a few rules in each `KUBE-SEP-(hash)` chain. The exact rules
will vary based on your exact config (including node-ports and load-balancers).
#### IPVS
```shell
u@node$ ipvsadm -ln
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
...
TCP 10.0.1.175:80 rr
-> 10.244.0.5:9376 Masq 1 0 0
-> 10.244.0.6:9376 Masq 1 0 0
-> 10.244.0.7:9376 Masq 1 0 0
...
```
IPVS proxy will create a virtual server for each service address(e.g. Cluster IP, External IP, NodePort IP, Load Balancer IP etc.) and some corresponding real servers for endpoints of the service, if any. In this example, service hostnames(`10.0.1.175:80`) has 3 endpoints(`10.244.0.5:9376`, `10.244.0.6:9376`, `10.244.0.7:9376`) and you'll get results similar to above.
### Is kube-proxy proxying?
Assuming you do see the above rules, try again to access your `Service` by IP: