【Automatic installation】

One: operating environment

operating system

centos7

firewall selinux

#systemctl stop firewalld && systemctl disable firewalld
#setenforce 0
#vim /etc/selinux/config
 SELINUX=disabled

Set /etc/host to resolve to all hosts

192.168.50.128 k8s-master 192.168.50.135 k8sr-node1

Two: installation and deployment

2.1 Preparation before installation

Before installing and deploying the cluster, first synchronize the time of the three servers through NTP, otherwise, an error may be prompted in the subsequent operation

ntpdate -u 192.168.2.68 (my physical machine is configured with ntp)

Install redhat-ca.crt on the node node

  yum install *rhsm* -y

2.2 etcd cluster configuration

master node configuration

1. Install kubernetes etcd

 yum -y install kubernetes-master etcd

2. Configure etcd options

  #vi /etc/etcd/etcd.conf

#[Member] #ETCD_CORS="" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" #ETCD_WAL_DIR="" ETCD_LISTEN_PEER_URLS="http://192.168.50.128:2380" ETCD_LISTEN_CLIENT_URLS="http://192.168.50.128:2379,http://127.0.0.1:2379" #ETCD_MAX_SNAPSHOTS="5" ETCD_MAX_WALS="5" ETCD_NAME="etcd1" #ETCD_SNAPSHOT_COUNT="100000" #ETCD_HEARTBEAT_INTERVAL="100" #ETCD_ELECTION_TIMEOUT="1000" #ETCD_QUOTA_BACKEND_BYTES="0" #ETCD_MAX_REQUEST_BYTES="1572864" #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s" #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s" #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s" # #[Clustering] ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.50.128:2380" ETCD_ADVERTISE_CLIENT_URLS="http://192.168.50.128:2379" #ETCD_DISCOVERY="" #ETCD_DISCOVERY_FALLBACK="proxy" #ETCD_DISCOVERY_PROXY="" #ETCD_DISCOVERY_SRV="" ETCD_INITIAL_CLUSTER="etcd1=http://192.168.50.128:2380,etcd2=http://192.168.50.135:2380" #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #ETCD_INITIAL_CLUSTER_STATE="new" #ETCD_STRICT_RECONFIG_CHECK="true" #ETCD_ENABLE_V2="true" #

nodes节点配置

1. Install and deploy kubernetes-node/etcd/flannel/docker

#yum -y install kubernetes-node etcd flannel docker

2. Configure etcd of k8s-node1

#vi /etc/etcd/etcd.conf

#[Member]

#ETCD_CORS="" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" #ETCD_WAL_DIR="" ETCD_LISTEN_PEER_URLS="http://192.168.50.135:2380" ETCD_LISTEN_CLIENT_URLS="http://192.168.50.135:2379,http://127.0.0.1:2379" #ETCD_MAX_SNAPSHOTS="5" #ETCD_MAX_WALS="5" ETCD_NAME="etcd2" #ETCD_SNAPSHOT_COUNT="100000" #ETCD_HEARTBEAT_INTERVAL="100" #ETCD_ELECTION_TIMEOUT="1000" #ETCD_QUOTA_BACKEND_BYTES="0" #ETCD_MAX_REQUEST_BYTES="1572864" #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s" #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s" #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s" # #[Clustering] ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.50.135:2380" ETCD_ADVERTISE_CLIENT_URLS="http://192.168.50.135:2379" #ETCD_DISCOVERY="" #ETCD_DISCOVERY_FALLBACK="proxy" #ETCD_DISCOVERY_PROXY="" #ETCD_DISCOVERY_SRV="" ETCD_INITIAL_CLUSTER="etcd1=http://192.168.50.128:2380,etcd2=http://192.168.50.135:2380" #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #ETCD_INITIAL_CLUSTER_STATE="new" #ETCD_STRICT_RECONFIG_CHECK="true" #ETCD_ENABLE_V2="true"

启动etcd cluster

  #systemctl start etcd.service
  #systemctl status etcd.service

View etcd cluster status

[root@k8s-master ~]# systemctl start etcd.service
[root@k8s-master ~]# etcdctl cluster-health
member 272e2ecbe3d84558 is healthy: got healthy result from http://192.168.50.128:2379
member 94b5d90215d70e1e is healthy: got healthy result from http://192.168.50.135:2379
cluster is healthy

A simple explanation for several URLS:

[member]
ETCD_NAME ：
ETCD_DATA_DIR：
ETCD_SNAPSHOT_COUNTER：
ETCD_HEARTBEAT_INTERVAL：
ETCD_ELECTION_TIMEOUT：
ETCD_LISTEN_PEER_URLS：
ETCD_LISTEN_CLIENT_URLS：
[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS：
ETCD_INITIAL_CLUSTER：
ETCD_ADVERTISE_CLIENT_URLS：

Two: Kubernetes cluster configuration

master node configuration

1. Modify the master configuration file

#vi /etc/kubernetes/apiserver

# The address on the local server to listen to. #KUBE_API_ADDRESS="--insecure-bind-address=127.0.0.1" KUBE_API_ADDRESS="--address=0.0.0.0"

# 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://192.168.50.128:2379,http://192.168.50.135:2379"

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

# Add your own! KUBE_API_ARGS=""

2. Start the service

systemctl start kube-apiserver.service 
systemctl start kube-controller-manager.service 
systemctl start kube-scheduler.service 
systemctl enable kube-apiserver.service 
systemctl enable kube-controller-manager.service 
systemctl enable kube-scheduler.service

nodes node configuration

1.Modify the configuration file of k8s-node1

 cat /etc/kubernetes/config

# 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://192.168.50.128:8080"

2.Configuring kubelet

cat /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=127.0.0.1"

# 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=192.168.50.135"

# location of the api-server KUBELET_API_SERVER="--api-servers=http://192.168.50.128:8080"

# pod infrastructure container KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

# Add your own! KUBELET_ARGS=""

3. Network configuration

Configure flannel on the k8s-node1 node

cat /etc/sysconfig/flanneld

# Flanneld configuration options

# etcd url location. Point this to the server where etcd runs FLANNEL_ETCD_ENDPOINTS="http://192.168.50.128:2379"

# etcd config key. This is the configuration key that flannel queries # For address range assignment FLANNEL_ETCD_PREFIX="/atomic.io/network"

# Any additional options that you want to pass #FLANNEL_OPTIONS=""

Start related services

 systemctl start kubelet && systemctl start kube-proxy
 systemctl enable kubelet && systemctl enable kube-proxy

Test on k8s-master

[root@k8s-master ~]#  kubectl get nodes
NAME             STATUS    AGE
192.168.50.135   Ready     21h
[root@k8s-master ~]#  etcdctl member list
272e2ecbe3d84558: name=etcd1 peerURLs=http://192.168.50.128:2380 clientURLs=http://192.168.50.128:2379 isLeader=true
94b5d90215d70e1e: name=etcd2 peerURLs=http://192.168.50.135:2380 clientURLs=http://192.168.50.135:2379 isLeader=false
[root@k8s-master ~]# etcdctl cluster-health
member 272e2ecbe3d84558 is healthy: got healthy result from http://192.168.50.128:2379
member 94b5d90215d70e1e is healthy: got healthy result from http://192.168.50.135:2379
cluster is healthy

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