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add service ipvs overview

pull/5571/head
Lion-Wei 2017-09-23 12:03:20 +08:00
parent ed5d92d91e
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docs/concepts/services-networking/service.md
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@ -203,6 +203,36 @@ having working [readiness probes](/docs/tasks/configure-pod-container/configure-
![Services overview diagram for iptables proxy](/images/docs/services-iptables-overview.svg)
### Proxy-mode: ipvs[alpha]
**Warning:** This is an alpha feature and not recommended for production clusters yet.
In this mode, kube-proxy watches Kubernetes `services` and `endpoints`,
call `netlink` interface create ipvs rules accordingly and sync ipvs rules with Kubernetes
`services` and `endpoints` periodically, to make sure ipvs status is
consistent with the expectation. When access the `service`, traffic will
be redirect to one of the backend `pod`.
Similar to iptables, Ipvs is based on netfilter hook function, but use hash
table as the underlying data structure and work in the kernal state.
That means ipvs redirects traffic can be much faster, and have much
better performance when sync proxy rules. Furthermore, ipvs provides more
options for load balancing algorithm, such as:
- rr: round-robin
- lc: least connection
- dh: destination hashing
- sh: source hashing
- sed: shortest expected delay
- nq: never queue
**Note:** ipvs mode assumed IPVS kernel modules are installed on the node
before running kube-proxy. When kube-proxy starts, if proxy mode is ipvs,
kube-proxy would validate if IPVS modules are installed on the node, if
it's not installed kube-proxy will fall back to iptables proxy mode.
![Services overview diagram for ipvs proxy](/images/docs/services-ipvs-overview.svg)
## Multi-Port Services
Many `Services` need to expose more than one port. For this case, Kubernetes

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