Kubernetes最小集群配置

迈不过友情╰ 2022-06-04 09:26 227阅读 0赞

Docker那么轻量意味着一个机器上可以跑很多的容器，容器一多，那么必然会涉及到管理，微服务需要进行管理，同样的容器也需要管理，这时候各种各样的管理工具出现了，而Kubernetes正是其中一款比较火热滴一个~

Kubernetes架构图：（来源：http://blog.csdn.net/lic95/article/details/55015284）：

![format_png][]

各个组件起什么作用，有什么职责，前人之述备矣，不再赘述。  
下面记录一下安装的过程：  
环境：  
master:centos 7.0  192.168.32.128   
node1:centos 7.0   192.168.32.129  
准备工作(所有机器需要做的操作)：  
1.安装Docker  
略...  
2.关闭防火墙  
\[root@localhost ~\]\# systemctl stop firewalld  
\[root@localhost ~\]\# systemctl disable firewalld  
3.为了保证各个机器之间的时间同步，需要安装ntp服务  
yum -y install ntp  
对所有的选项都选择y，直接安装  
主机部分：  
\[root@localhost ~\]\# yum install etcd kubernetes flannel-y  
在主机master上同时部署etcd server，kubernetes master,并且安装docker。  
  
更改etcd配置(标红处)：  
\# \[member\]  
ETCD\_NAME=master  
ETCD\_DATA\_DIR="/var/lib/etcd/default.etcd"  
\#ETCD\_WAL\_DIR=""  
\#ETCD\_SNAPSHOT\_COUNT="10000"  
\#ETCD\_HEARTBEAT\_INTERVAL="100"  
\#ETCD\_ELECTION\_TIMEOUT="1000"  
\#ETCD\_LISTEN\_PEER\_URLS="http://localhost:2380"  
ETCD\_LISTEN\_CLIENT\_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"  
\#ETCD\_MAX\_SNAPSHOTS="5"  
\#ETCD\_MAX\_WALS="5"  
\#ETCD\_CORS=""  
\#  
\#\[cluster\]  
\#ETCD\_INITIAL\_ADVERTISE\_PEER\_URLS="http://localhost:2380"  
\# if you use different ETCD\_NAME (e.g. test), set ETCD\_INITIAL\_CLUSTER value for this name, i.e. "test=http://..."  
\#ETCD\_INITIAL\_CLUSTER="default=http://localhost:2380"  
\#ETCD\_INITIAL\_CLUSTER\_STATE="new"  
\#ETCD\_INITIAL\_CLUSTER\_TOKEN="etcd-cluster"  
ETCD\_ADVERTISE\_CLIENT\_URLS="http://192.168.32.128:2379,http://192.168.32.128:4001"  
  
  
配置  
\[root@localhost ~\]\# vi /etc/sysconfig/flanneld  
\# Flanneld configuration options  
\# etcd url location.  Point this to the server where etcd runs  
FLANNEL\_ETCD\_ENDPOINTS="http://192.168.32.128:2379"  
\# etcd config key.  This is the configuration key that flannel queries  
\# For address range assignment  
FLANNEL\_ETCD\_PREFIX="/coreos.com/network"  
\# Any additional options that you want to pass  
\#FLANNEL\_OPTIONS=""

启动  
\[root@localhost ~\]\# systemctl start etcd  
添加如下的命令，配置etcd中关于flannel的key:  
\[root@localhost ~\]\# etcdctl set /coreos.com/network/config '\{ "Network": "192.168.0.0/16" \}'（设置了一个B类的IP地址网段，和上边的  
FLANNEL\_ETCD\_PREFIX="/coreos.com/network"的要对应）  
参考文章:  
http://www.cnblogs.com/zhenyuyaodidiao/p/6237019.html  
修改k8s server的配置文件:

vi/etc/kubernetes/apiserver  
\#\#\#  
\# 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://192.168.32.128:2379"  
\# Address range to use for services  
KUBE\_SERVICE\_ADDRESSES="--service-cluster-ip-range=192.168.0.0/16"  
\# default admission control policies

\[root@localhost ~\]\# vi /etc/kubernetes/controller-manager  
修改:  
\# Add your own!  
KUBE\_CONTROLLER\_MANAGER\_ARGS="--node-monitor-grace-period=10s --pod-eviction-timeout=10s"

\[root@localhost ~\]\# vi /etc/kubernetes/config  
修改:  
\# How the controller-manager, scheduler, and proxy find the apiserver  
KUBE\_MASTER="--master=http://192.168.32.128:8080"

启动  
systemctl enable kube-apiserver kube-scheduler kube-controller-manager  
systemctl start kube-apiserver kube-scheduler kube-controller-manager  
  
显示端口号:  
ss -antl

![Center][]

启动成功。  
\----------------------  
node1设置:  
安装kubernetes-nodes以及flanneld  
\[root@localhost ~\]\# yum install kubernetes flannel -y  
修改配置文件  
vi /etc/kubernetes/config  
\#\#\#  
\# kubernetes system config  
\#  
\# The following values are used to configure various aspects of all  
\# kubernetes services, including  
\#  
\#   kube-apiserver.service  
\#   kube-controller-manager.service  
\#   kube-scheduler.service  
\#   kubelet.service  
\#   kube-proxy.service  
\# logging to stderr means we get it in the systemd journal  
KUBE\_LOGTOSTDERR="--logtostderr=true"

\# journal message level, 0 is debug  
KUBE\_LOG\_LEVEL="--v=0"  
\# Should this cluster be allowed to run privileged docker containers  
KUBE\_ALLOW\_PRIV="--allow-privileged=false"  
\# How the controller-manager, scheduler, and proxy find the apiserver  
KUBE\_MASTER="--master=http://192.168.32.128:8080"  
  
\[root@localhost ~\]\# vi /etc/kubernetes/kubelet  
\#\#\#  
\# kubernetes kubelet (minion) config  
\# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)  
KUBELET\_ADDRESS="--address=0.0.0.0"  
\# The port for the info server to serve on  
\# KUBELET\_PORT="--port=10250"  
\# You may leave this blank to use the actual hostname  
KUBELET\_HOSTNAME="--hostname-override=192.168.32.129"  
\# location of the api-server  
KUBELET\_API\_SERVER="--api-servers=http://192.168.32.128:8080"  
\# pod infrastructure container  
KUBELET\_POD\_INFRA\_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest  
\# Add your own!  
KUBELET\_ARGS=""  
  
  
\[root@localhost ~\]\# vi /etc/sysconfig/flanneld  
\# Flanneld configuration options  
\# etcd url location.  Point this to the server where etcd runs  
FLANNEL\_ETCD\_ENDPOINTS="http://192.168.32.128:2379"  
\# etcd config key.  This is the configuration key that flannel queries  
\# For address range assignment  
FLANNEL\_ETCD\_PREFIX="/coreos.com/network"  
\# Any additional options that you want to pass  
\#FLANNEL\_OPTIONS=""

最后，  
Master:  
\[root@localhost ~\]\# systemctl start flanneld.service   
\[root@localhost ~\]\# service docker restart  
Redirecting to /bin/systemctl restart  docker.service  
\[root@localhost ~\]\# systemctl restart kube-apiserver.service  
\[root@localhost ~\]\# systemctl restart kube-controller-manager.service  
\[root@localhost ~\]\# systemctl restart kube-scheduler.service  
node节点:  
\[root@localhost ~\]\# systemctl enable flanneld.service  
\[root@localhost ~\]\# systemctl start flanneld.service  
Redirecting to /bin/systemctl restart  docker.service  
\[root@localhost ~\]\# systemctl restart kubelet.service  
\[root@localhost ~\]\# systemctl restart kube-proxy.service

![Center 1][]

至此，一个最简单的kubernetes集群创建完毕。

[format_png]: /images/20220604/d197897f50e34d11b8e5df10cb4b4e09.png
[Center]: /images/20220604/04d4708786624e3fa58efbe0e2b9ccca.png
[Center 1]: /images/20220604/2de007613b7a4c61bb126a8e494d2e56.png