大鹏一日同风起

手动搭建kubernetes1.7.5集群

作者：

pbdatacn

在

ip
组件
备注
192.168.151.41 kube-api-server

kube-controller

kube-schedular

etcd
192.168.151.40 etcd

flannel

docker

kubelet

kube-proxy

 
192.168.151.38 etcd

参考文档： kubernetes-handbook

软件依赖

  • golang，略过
  • cfssl，证书相关
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$ go get -u github.com/cloudflare/cfssl/cmd/cfssl
$ go get -u github.com/cloudflare/cfssl/cmd/...

cfssl的使用请参考： cfssl使用文档

CA

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$ mkdir /root/zhaoming9/ssl
$ cd /root/zhaoming9/ssl
$ cfssl print-defaults config > config.json
$ cfssl print-defaults csr > csr.json
# 根据config.json文件的格式创建如下的ca-config.json文件
# 过期时间设置成了 87600h
$ cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ],
        "expiry": "87600h"
      }
    }
  }
}
EOF

kubernetes证书

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$ vi kubernetes-csr.json
{
    "CN": "kubernetes",
    "hosts": [
      "127.0.0.1",
      "192.168.151.41",
      "192.168.151.40",
      "192.168.151.38",
      "192.168.151.33",
      "10.1.0.1",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "BeiJing",
            "L": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
$ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes 

 

admin证书

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$ vi admin-csr.json
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
$ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

kube-proxy证书

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$ vi kube-proxy-csr.json
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
$ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy

证书分发

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$ mkdir -p /etc/kubernetes/ssl
$ cp *.pem /etc/kubernetes/ssl

每台主机都相同

 

ETCD集群安装

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$ wget https://github.com/coreos/etcd/releases/download/v3.2.7/etcd-v3.2.7-linux-amd64.tar.gz
$ tar xzvf etcd-v3.2.7-linux-amd64.tar.gz
$ mv etcd-v3.2.7-linux-amd64/etcd* /usr/local/bin
$ vi /etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd \
  --name ${ETCD_NAME} \
  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  --peer-cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --peer-key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  --trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --peer-trusted-ca-file=/etc/kubernetes/ssl/ca.pem \
  --initial-advertise-peer-urls ${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
  --listen-peer-urls ${ETCD_LISTEN_PEER_URLS} \
  --listen-client-urls ${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
  --advertise-client-urls ${ETCD_ADVERTISE_CLIENT_URLS} \
  --initial-cluster-token ${ETCD_INITIAL_CLUSTER_TOKEN} \
  --initial-cluster ${ETCD_INITIAL_CLUSTER} \
  --initial-cluster-state new \
  --data-dir=${ETCD_DATA_DIR}
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
$ vi /etc/etcd/etcd.conf
# [member]
ETCD_NAME=infra1
ETCD_DATA_DIR="/var/lib/etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.151.41:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.151.41:2379"
# [cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.151.41:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER="infra1=https://192.168.151.41:2380,infra2=https://192.168.151.40:2380,infra3=https://192.168.151.38:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.151.41:2379"
$ systemctl daemon-reload
$ systemctl enable etcd
$ systemctl start etcd
$ stemctl status etcd
$ etcdctl \
  --ca-file=/etc/kubernetes/ssl/ca.pem \
  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  cluster-health

 

kubernetes

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$ cd /root/zhaoming9
$ wget https://github.com/kubernetes/kubernetes/releases/download/v1.7.5/kubernetes.tar.gz
$ tar xzvf kubernetes.tar.gz

 

kubectl kubeconfig

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$ export KUBE_APISERVER="https://192.168.151.41:6443"
# 设置集群参数
$ kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER}
# 设置客户端认证参数
$ kubectl config set-credentials admin \
  --client-certificate=/etc/kubernetes/ssl/admin.pem \
  --embed-certs=true \
  --client-key=/etc/kubernetes/ssl/admin-key.pem
# 设置上下文参数
$ kubectl config set-context kubernetes \
  --cluster=kubernetes \
  --user=admin
# 设置默认上下文
$ kubectl config use-context kubernetes

 

kube-apiserver

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$ vi /etc/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Service
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
After=etcd.service
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/apiserver
ExecStart=/usr/local/bin/kube-apiserver \
        $KUBE_LOGTOSTDERR \
        $KUBE_LOG_LEVEL \
        $KUBE_ETCD_SERVERS \
        $KUBE_API_ADDRESS \
        $KUBE_API_PORT \
        $KUBELET_PORT \
        $KUBE_ALLOW_PRIV \
        $KUBE_SERVICE_ADDRESSES \
        $KUBE_ADMISSION_CONTROL \
        $KUBE_API_ARGS
Restart=on-failure
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
 
$ 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=true"
# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://192.168.151.41:8080"
 
$ 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="--advertise-address=192.168.151.41 --bind-address=192.168.151.41 --insecure-bind-address=192.168.151.41"
#
## The port on the local server to listen on.
KUBE_API_PORT="--insecure-port=8080 --secure-port=6443"
#
## Port minions listen on
#KUBELET_PORT="--kubelet-port=10250"
#
## Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=https://192.168.151.41:2379,https://192.168.151.40:2379,https://192.168.151.38:2379 --etcd-cafile=/etc/kubernetes/ssl/ca.pem --etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem --etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem"
#
## Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.1.0.0/16"
#
## default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=ServiceAccount,NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
#
## Add your own!
KUBE_API_ARGS="--authorization-mode=RBAC --runtime-config=rbac.authorization.k8s.io/v1beta1 --service-node-port-range=30000-32767 --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem --client-ca-file=/etc/kubernetes/ssl/ca.pem --service-account-key-file=/etc/kubernetes/ssl/ca-key.pem  --enable-swagger-ui=true --apiserver-count=3 --audit-log-maxage=30 --audit-log-maxbackup=3 --audit-log-maxsize=100 --audit-log-path=/var/lib/audit.log --event-ttl=1h --kubelet-https=true  --kubelet-certificate-authority=/etc/kubernetes/ssl/ca.pem --kubelet-client-certificate=/etc/kubernetes/ssl/kubernetes.pem --kubelet-client-key=/etc/kubernetes/ssl/kubernetes-key.pem"
 
$ systemctl daemon-reload
$ systemctl enable kube-apiserver
$ systemctl start kube-apiserver
$ systemctl status kube-apiserver

 

kube-controler-manager

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$ vi /etc/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/controller-manager
ExecStart=/usr/local/bin/kube-controller-manager \
        $KUBE_LOGTOSTDERR \
        $KUBE_LOG_LEVEL \
        $KUBE_MASTER \
        $KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
$ vi /etc/kubernetes/controller-manager
###
# The following values are used to configure the kubernetes controller-manager
# defaults from config and apiserver should be adequate
# Add your own!
KUBE_CONTROLLER_MANAGER_ARGS="--address=127.0.0.1 --service-cluster-ip-range=10.1.0.0/16 --cluster-name=kubernetes --cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem --cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem  --service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem --root-ca-file=/etc/kubernetes/ssl/ca.pem --leader-elect=true"
 
$ systemctl daemon-reload
$ systemctl enable kube-controller-manager
$ systemctl start kube-controller-manager

 

kube-scheduler

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$ vi /etc/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler Plugin
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/scheduler
ExecStart=/usr/local/bin/kube-scheduler \
            $KUBE_LOGTOSTDERR \
            $KUBE_LOG_LEVEL \
            $KUBE_MASTER \
            $KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
 
$ vi /etc/kubernetes/scheduler
###
# kubernetes scheduler config
# default config should be adequate
# Add your own!
KUBE_SCHEDULER_ARGS="--leader-elect=true --address=127.0.0.1"
 
$ systemctl daemon-reload
$ systemctl enable kube-scheduler
$ systemctl start kube-scheduler

Flannel

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$ yum install -y flannel
$ vi /etc/systemd/system/flannel.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
After=network-online.target
Wants=network-online.target
After=etcd.service
Before=docker.service
[Service]
Type=notify
EnvironmentFile=/etc/flannel/flanneld
ExecStart=/usr/bin/flanneld-start \
  -etcd-endpoints=${ETCD_ENDPOINTS} \
  -etcd-prefix=${ETCD_PREFIX} \
  $FLANNEL_OPTIONS
ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -i
Restart=on-failure
[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
 
$ vi /etc/flannel/flanneld
# Flanneld configuration options 
# etcd url location.  Point this to the server where etcd runs
ETCD_ENDPOINTS="https://192.168.151.41:2379,https://192.168.151.40:2379,https://192.168.151.38:2379"
# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
ETCD_PREFIX="/kube-flannel/network"
# Any additional options that you want to pass
FLANNEL_OPTIONS="-etcd-cafile=/etc/kubernetes/ssl/ca.pem -etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem -etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem"
# docker.service 增加以下
EnvironmentFile=-/run/flannel/docker
EnvironmentFile=-/run/docker_opts.env
EnvironmentFile=-/run/flannel/subnet.env
 
# docker 配置cgroup为systemd
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --api-cors-header='*' --exec-opt native.cgroupdriver=systemd
$ etcdctl \
  --ca-file=/etc/kubernetes/ssl/ca.pem \
  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  mkdir /kube-flannel/network
etcdctl \
  --ca-file=/etc/kubernetes/ssl/ca.pem \
  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  mk /kube-flannel/network/config '{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"vxlan"}}'
 
$ systemctl daemon-reload
$ systemctl start flannel
$ systemctl status flannel
$ systemctl restart docker
$ etcdctl \
  --ca-file=/etc/kubernetes/ssl/ca.pem \
  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  ls /kube-flannel/network/subnets

 

kubelet

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$ vi /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
WorkingDirectory=/var/lib/kubelet
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/kubelet
ExecStart=/usr/local/bin/kubelet \
            $KUBE_LOGTOSTDERR \
            $KUBE_LOG_LEVEL \
            $KUBELET_API_SERVER \
            $KUBELET_ADDRESS \
            $KUBELET_PORT \
            $KUBELET_HOSTNAME \
            $KUBE_ALLOW_PRIV \
            $KUBELET_POD_INFRA_CONTAINER \
            $KUBELET_ARGS
Restart=on-failure
[Install]
WantedBy=multi-user.target
 
$ 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=192.168.151.40"
#
## The port for the info server to serve on
KUBELET_PORT="--port=10250 --client-ca-file=/etc/kubernetes/ssl/ca.pem"
#
## You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname-override=192.168.151.40"
#
## location of the api-server
#KUBELET_API_SERVER="--api-servers=https://192.168.151.41:6443"
#
## pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=gcr.io/google_containers/pause-amd64:3.0"
#
## Add your own!
KUBELET_ARGS="--allow-privileged=true --cgroup-driver=systemd --cluster-dns=10.1.0.2 --cluster-domain=cluster.local --cert-dir=/etc/kubernetes/ssl  --hairpin-mode promiscuous-bridge --serialize-image-pulls=false --kubeconfig=/etc/kubernetes/kubelet.kubeconfig --require-kubeconfig --cert-dir=/etc/kubernetes/ssl"
$ docker pull index.tenxcloud.com/google_containers/pause-amd64:3.0
$ docker tag index.tenxcloud.com/google_containers/pause-amd64:3.0 gcr.io/google_containers/pause-amd64:3.0
$ docker rmi index.tenxcloud.com/google_containers/pause-amd64:3.0
$ systemctl daemon-reload
$ systemctl enable kubelet
$ systemctl start kubelet
$ systemctl status kubelet

 

kube-proxy

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$ vi /etc/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/proxy
ExecStart=/usr/local/bin/kube-proxy \
        $KUBE_LOGTOSTDERR \
        $KUBE_LOG_LEVEL \
        $KUBE_MASTER \
        $KUBE_PROXY_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
 
$ vi /etc/kubernetes/proxy
###
# kubernetes proxy config
# default config should be adequate
# Add your own!
KUBE_PROXY_ARGS="--bind-address=192.168.151.40 --hostname-override=192.168.151.40 --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig --cluster-cidr=10.1.0.0/16"
 
$ export KUBE_APISERVER="https://192.168.151.41:6443"
# 设置集群参数
$ kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER}
# 设置客户端认证参数
$ kubectl config set-credentials proxy \
  --client-certificate=/etc/kubernetes/ssl/kube-proxy.pem \
  --embed-certs=true \
  --client-key=/etc/kubernetes/ssl/kube-proxy-key.pem
# 设置上下文参数
$ kubectl config set-context kube-proxy \
  --cluster=kubernetes \
  --user=proxy
# 设置默认上下文
$ kubectl config use-context kube-proxy
$ systemctl daemon-reload
$ systemctl enable kube-proxy
$ systemctl start kube-proxy
$ systemctl status kube-proxy

集群测试

1
$ kubectl run nginx --replicas=2 --labels="run=load-balancer-example" --image=nginx

 

 

 

 

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