<p><a href="https://github.com/kubernetes/kubernetes/blob/master/cluster/centos/master/scripts/apiserver.sh" rel="nofollow noreferrer">https://github.com/kubernetes/kubernetes/blob/master/cluster/centos/master/scripts/apiserver.sh</a></p>

<blockquote>
<pre><code># Insecure kube configuration parameters go under here when node['kubernetes']['secure']['enabled'] == 'false'
&lt;% if node['kubernetes']['secure']['enabled'] == 'false' -%&gt;
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
...

# Secure kube configuration parameters go under here when node['kubernetes']['secure']['enabled'] == 'true'
&lt;% if node['kubernetes']['secure']['enabled'] == 'true' -%&gt;
KUBE_API_ADDRESS="--bind-address=0.0.0.0 --insecure-bind-address=127.0.0.1 "
...
</code></pre>
</blockquote>

<p>It seems that the <code>KUBE_API_ADDRESS</code> will only listen to 0.0.0.0 if kubernetes has been secured.</p>

CC BY-SA 3.0
2017-11-12T14:04:55.253Z
2017-11-12T14:18:08.507Z
2017-11-12T14:18:08.507Z
030
<h2>Questions</h2>

<p>Where is the explanations or documentations of the Kubernetes API Server configuration parameters?</p>

<h2>Background</h2>

<p>There are parameters to configure for Kubernetes API server e.g. KUBE_API_ADDRESS (which seems needs to be changed from 127.0.0.1) for multi node cluster to work.</p>

<p>Looking for a definite configuration documentation of how to configure API server but so far could not find one. </p>

<p><a href="https://kubernetes.io/docs/getting-started-guides/centos/centos_manual_config/" rel="noreferrer">Setup CentOS (Kubernetes.io)</a> says below.</p>

<pre><code># The address on the local server to listen to.
KUBE_API_ADDRESS="--address=0.0.0.0"
</code></pre>

<p><a href="https://github.com/kubernetes/kubernetes/blob/master/cluster/centos/master/scripts/apiserver.sh" rel="noreferrer">Kubernetes GitHub</a> says below.</p>

<pre><code># --insecure-bind-address=127.0.0.1: The IP address on which to serve the --insecure-port.
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
</code></pre>

<p><a href="https://github.com/projectatomic/adb-atomic-developer-bundle/issues/250" rel="noreferrer">Connecting to Kubernetes API server from outside of Vagrant box #250</a> says below.</p>

<blockquote>
  <p>By default kube-apiserver listens only on 127.0.0.1.
  Without reconfiguring it it is not possible to connect to Kubernetes using kubectl from another machine.</p>
</blockquote>

<p>Kubernetes 1.7 /etc/kubernetes/apiserver is below.</p>

<pre><code>###
# kubernetes system config
#
# The following values are used to configure the kube-apiserver
#

# The address on the local server to listen to.
KUBE_API_ADDRESS="--insecure-bind-address=127.0.0.1"

# The port on the local server to listen on.
# KUBE_API_PORT="--port=8080"

# Port minions listen on
# KUBELET_PORT="--kubelet-port=10250"

# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

# default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"

# Add your own!
KUBE_API_ARGS=""
</code></pre>

CC BY-SA 3.0
2017-11-09T12:19:55.910Z
https://kubernetes.io/docs/reference/ and https://kubernetes.io/docs/admin/kube-apiserver/
Tensibai
CC BY-SA 3.0
2017-11-09T19:00:34.027Z
@Tensibai, I am afraid it has no reference to "--address=0.0.0.0" nor KUBE_API_ADDRESS. Would like to know where they are explained.
mon
CC BY-SA 3.0
2017-11-09T22:14:35.243Z
Direct link goes to api v1. 8, I've no idea what centos version your example comes from, see bind-address
Tensibai
<kubernetes><documentation>
Where is the documentation of Kubernetes API server configurations?
mon
# Where is the documentation of Kubernetes API server configurations?

(Asked by: username_0 on 2017-11-08)

Questions
Where is the explanations or documentations of the Kubernetes API Server configuration parameters?
Background
There are parameters to configure for Kubernetes API server e.g. KUBE_API_ADDRESS (which seems needs to be changed from 127.0.0.1) for multi node cluster to work.
Looking for a definite configuration documentation of how to configure API server but so far could not find one. 
Setup CentOS (Kubernetes.io) says below.
# The address on the local server to listen to.
KUBE_API_ADDRESS="--address=0.0.0.0"

Kubernetes GitHub says below.
# --insecure-bind-address=127.0.0.1: The IP address on which to serve the --insecure-port.
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"

Connecting to Kubernetes API server from outside of Vagrant box #250 says below.

By default kube-apiserver listens only on 127.0.0.1.
  Without reconfiguring it it is not possible to connect to Kubernetes using kubectl from another machine.

Kubernetes 1.7 /etc/kubernetes/apiserver is below.
###
# kubernetes system config
#
# The following values are used to configure the kube-apiserver
#

# The address on the local server to listen to.
KUBE_API_ADDRESS="--insecure-bind-address=127.0.0.1"

# The port on the local server to listen on.
# KUBE_API_PORT="--port=8080"

# Port minions listen on
# KUBELET_PORT="--kubelet-port=10250"

# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

# default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"

# Add your own!
KUBE_API_ARGS=""

**Tags:** kubernetes, documentation

> **Comments:**
> **username_1**: https://kubernetes.io/docs/reference/ and https://kubernetes.io/docs/admin/kube-apiserver/  
> **username_0**: @username_1, I am afraid it has no reference to "--address=0.0.0.0" nor KUBE_API_ADDRESS. Would like to know where they are explained.  
> **username_1**: Direct link goes to api v1. 8, I've no idea what centos version your example comes from, see bind-address  

---

## 1 answers

### Answer by username_2 on 2017-11-12. Score: 4

https://github.com/kubernetes/kubernetes/blob/master/cluster/centos/master/scripts/apiserver.sh

# Insecure kube configuration parameters go under here when node['kubernetes']['secure']['enabled'] == 'false'
<% if node['kubernetes']['secure']['enabled'] == 'false' -%>
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
...

# Secure kube configuration parameters go under here when node['kubernetes']['secure']['enabled'] == 'true'
<% if node['kubernetes']['secure']['enabled'] == 'true' -%>
KUBE_API_ADDRESS="--bind-address=0.0.0.0 --insecure-bind-address=127.0.0.1 "
...


It seems that the KUBE_API_ADDRESS will only listen to 0.0.0.0 if kubernetes has been secured.


---

