安装k8s Master高可用集群
安装k8s Master高可用集群主机角色组件172.18.6.101K8S MasterKubelet,kubectl,cni,etcd172.18.6.102K8S MasterKubelet,kubectl,cni,etcd172.18.6.103K8S MasterKubelet,kubectl,cni,etcd17
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安装k8s Master高可用集群
| 主机 | 角色 | 组件 |
|---|---|---|
| 172.18.6.101 | K8S Master | Kubelet,kubectl,cni,etcd |
| 172.18.6.102 | K8S Master | Kubelet,kubectl,cni,etcd |
| 172.18.6.103 | K8S Master | Kubelet,kubectl,cni,etcd |
| 172.18.6.104 | K8S Worker | Kubelet,cni |
| 172.18.6.105 | K8S Worker | Kubelet,cni |
| 172.18.6.106 | K8S Worker | Kubelet,cni |
etcd安装
保证k8smaster高可用，不建议使用container的方式启动etcd集群，因为container可能会出现随时死掉的情况，etcd每个节点的启动service又是有状态的。因此此处将以二进制方式进行部署，建议在正式环境中最少部署3个节点的etcd集群，etcd具体安装步骤参考本地服务方式搭建etcd集群
必要组件以及证书安装
ca证书
参考kubernetes中证书生成创建CA证书，并将ca-key.pem与ca.pem放置到k8s集群中所有节点下的/etc/kubernetes/ssl下
woker证书制作
参考kubernetes中证书生成从节点证书生成段落，进行worker节点证书生成。对应ip的证书放置到对应worker节点的/etc/kubernetes/ssl下
kubelet.conf配置安装
创建/etc/kubernetes/kubelet.conf内容如下：
apiVersion: v1
kind: Config
clusters:
- name: local
cluster:
server: https://[负载均衡IP]:[apiserver端口]
certificate-authority: /etc/kubernetes/ssl/ca.pem
users:
- name: kubelet
user:
client-certificate: /etc/kubernetes/ssl/worker.pem
client-key: /etc/kubernetes/ssl/worker-key.pem
contexts:
- context:
cluster: local
user: kubelet
name: kubelet-context
current-context: kubelet-contextcni插件安装
从containernetworking的cni项目中下载cni的必须二进制文件，需要放置到k8s集群中所有节点下的/opt/cni/bin下。
后续将提供rpm包进行一键安装。
kubelet服务部署
注意：后续将提供rpm包进行一键安装。
将对应版本的
kubelet二进制文件放置到k8s集群中所有节点下的/usr/bin下创建
/etc/systemd/system/kubelet.service内容如下：# /etc/systemd/system/kubelet.service [Unit] Description=kubelet: The Kubernetes Node Agent Documentation=http://kubernetes.io/docs/ [Service] Environment="KUBELET_KUBECONFIG_ARGS=--kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true" Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true" Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin" Environment="KUBELET_DNS_ARGS=--cluster-dns=10.100.0.10 --cluster-domain=cluster.local" Environment="KUBELET_EXTRA_ARGS=--pod-infra-container-image=registry.aliyuncs.com/shenshouer/pause-amd64:3.0" ExecStart= ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_SYSTEM_PODS_ARGS $KUBELET_NETWORK_ARGS $KUBELET_DNS_ARGS $KUBELET_EXTRA_ARGS Restart=always StartLimitInterval=0 RestartSec=10 [Install] WantedBy=multi-user.target创建如下目录：
/etc/kubernetes/ |-- kubelet.conf |-- manifests `-- ssl |-- ca-key.pem |-- ca.pem |-- worker.csr |-- worker-key.pem |-- worker-openssl.cnf `-- worker.pem
master组件安装
配置负载均衡
配置LVS使用VIP172.18.6.254指向后端172.18.6.101、172.18.6.102、172.18.6.103， 如需简单，则可使用nginx进行TCP4层的负载。
证书生成
openssl.cnf内容如下：
[req]
req_extensions = v3_req
distinguished_name = req_distinguished_name
[req_distinguished_name]
[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names
[alt_names]
DNS.1 = kubernetes
DNS.2 = kubernetes.default
DNS.3 = kubernetes.default.svc
DNS.4 = kubernetes.default.svc.cluster.local
DNS.5 = test.example.com.cn
IP.1 = 10.96.0.1
IP.2 = 172.18.6.101
IP.3 = 172.18.6.102
IP.3 = 172.18.6.103
IP.4 = 172.18.6.254# 三个master的IP
IP.2 = 172.18.6.101
IP.3 = 172.18.6.102
IP.3 = 172.18.6.103
# LVS负载均衡的VIP
IP.4 = 172.18.6.254
# 可能会用到的负载均衡domain
DNS.5 = test.example.com.cn证书生成具体步骤请参考kubernetes中证书生成 Master证书生成部分与Worker证书生成部分，生成后的证书需要放置到三台Master节点对应路径上
其他组件安装
Master节点上/etc/kubernetes/manifests下放置如下三个文件
- kube-apiserver.manifest:
# /etc/kubernetes/manifests/kube-apiserver.manifest
{
"kind": "Pod",
"apiVersion": "v1",
"metadata": {
"name": "kube-apiserver",
"namespace": "kube-system",
"creationTimestamp": null,
"labels": {
"component": "kube-apiserver",
"tier": "control-plane"
}
},
"spec": {
"volumes": [
{
"name": "k8s",
"hostPath": {
"path": "/etc/kubernetes"
}
},
{
"name": "certs",
"hostPath": {
"path": "/etc/ssl/certs"
}
}
],
"containers": [
{
"name": "kube-apiserver",
"image": "registry.aliyuncs.com.cn/shenshouer/kube-apiserver:v1.5.2",
"command": [
"kube-apiserver",
"--insecure-bind-address=127.0.0.1",
"--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,ResourceQuota",
"--service-cluster-ip-range=10.96.0.0/12",
"--service-account-key-file=/etc/kubernetes/ssl/apiserver-key.pem",
"--client-ca-file=/etc/kubernetes/ssl/ca.pem",
"--tls-cert-file=/etc/kubernetes/ssl/apiserver.pem",
"--tls-private-key-file=/etc/kubernetes/ssl/apiserver-key.pem",
"--secure-port=6443",
"--allow-privileged",
"--advertise-address=[当前Master节点IP]",
"--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname",
"--anonymous-auth=false",
"--etcd-servers=http://127.0.0.1:2379"
],
"resources": {
"requests": {
"cpu": "250m"
}
},
"volumeMounts": [
{
"name": "k8s",
"readOnly": true,
"mountPath": "/etc/kubernetes/"
},
{
"name": "certs",
"mountPath": "/etc/ssl/certs"
}
],
"livenessProbe": {
"httpGet": {
"path": "/healthz",
"port": 8080,
"host": "127.0.0.1"
},
"initialDelaySeconds": 15,
"timeoutSeconds": 15,
"failureThreshold": 8
}
}
],
"hostNetwork": true
},
"status": {}
}kube-controller-manager.manifest
{ "kind": "Pod", "apiVersion": "v1", "metadata": { "name": "kube-controller-manager", "namespace": "kube-system", "creationTimestamp": null, "labels": { "component": "kube-controller-manager", "tier": "control-plane" } }, "spec": { "volumes": [ { "name": "k8s", "hostPath": { "path": "/etc/kubernetes" } }, { "name": "certs", "hostPath": { "path": "/etc/ssl/certs" } } ], "containers": [ { "name": "kube-controller-manager", "image": "registry.aliyuncs.com/shenshouer/kube-controller-manager:v1.5.2", "command": [ "kube-controller-manager", "--address=127.0.0.1", "--leader-elect", "--master=127.0.0.1:8080", "--cluster-name=kubernetes", "--root-ca-file=/etc/kubernetes/ssl/ca.pem", "--service-account-private-key-file=/etc/kubernetes/ssl/apiserver-key.pem", "--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem", "--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem", "--insecure-experimental-approve-all-kubelet-csrs-for-group=system:kubelet-bootstrap", "--allocate-node-cidrs=true", "--cluster-cidr=10.244.0.0/16" ], "resources": { "requests": { "cpu": "200m" } }, "volumeMounts": [ { "name": "k8s", "readOnly": true, "mountPath": "/etc/kubernetes/" }, { "name": "certs", "mountPath": "/etc/ssl/certs" } ], "livenessProbe": { "httpGet": { "path": "/healthz", "port": 10252, "host": "127.0.0.1" }, "initialDelaySeconds": 15, "timeoutSeconds": 15, "failureThreshold": 8 } } ], "hostNetwork": true }, "status": {} }
kube-scheduler.manifest
{ "kind": "Pod", "apiVersion": "v1", "metadata": { "name": "kube-scheduler", "namespace": "kube-system", "creationTimestamp": null, "labels": { "component": "kube-scheduler", "tier": "control-plane" } }, "spec": { "containers": [ { "name": "kube-scheduler", "image": "registry.aliyuncs.com/shenshouer/kube-scheduler:v1.5.2", "command": [ "kube-scheduler", "--address=127.0.0.1", "--leader-elect", "--master=127.0.0.1:8080" ], "resources": { "requests": { "cpu": "100m" } }, "livenessProbe": { "httpGet": { "path": "/healthz", "port": 10251, "host": "127.0.0.1" }, "initialDelaySeconds": 15, "timeoutSeconds": 15, "failureThreshold": 8 } } ], "hostNetwork": true }, "status": {}
其他组件安装
kube-proxy安装
在任意master上执行kubectl create -f kube-proxy-ds.yaml，其中kube-proxy-ds.yaml内容如下：
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
labels:
component: kube-proxy
k8s-app: kube-proxy
kubernetes.io/cluster-service: "true"
name: kube-proxy
tier: node
name: kube-proxy
namespace: kube-system
spec:
selector:
matchLabels:
component: kube-proxy
k8s-app: kube-proxy
kubernetes.io/cluster-service: "true"
name: kube-proxy
tier: node
template:
metadata:
labels:
component: kube-proxy
k8s-app: kube-proxy
kubernetes.io/cluster-service: "true"
name: kube-proxy
tier: node
spec:
containers:
- command:
- kube-proxy
- --kubeconfig=/run/kubeconfig
- --cluster-cidr=10.244.0.0/16
image: registry.aliyuncs.com/shenshouer/kube-proxy:v1.5.2
imagePullPolicy: IfNotPresent
name: kube-proxy
resources: {}
securityContext:
privileged: true
terminationMessagePath: /dev/termination-log
volumeMounts:
- mountPath: /var/run/dbus
name: dbus
- mountPath: /run/kubeconfig
name: kubeconfig
- mountPath: /etc/kubernetes/ssl
name: ssl
dnsPolicy: ClusterFirst
hostNetwork: true
restartPolicy: Always
securityContext: {}
terminationGracePeriodSeconds: 30
volumes:
- hostPath:
path: /etc/kubernetes/kubelet.conf
name: kubeconfig
- hostPath:
path: /var/run/dbus
name: dbus
- hostPath:
path: /etc/kubernetes/ssl
name: ssl网络组件安装
在任意master上执行kubectl apply -f kube-flannel.yaml，其中kube-flannel.yaml内容如下，注意，如果是在vagrant启动的虚拟机中运行，请修改flannled启动参数将--iface指向具体通讯网卡
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
namespace: kube-system
name: kube-flannel-cfg
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"type": "flannel",
"delegate": {
"ipMasq": true,
"bridge": "cbr0",
"hairpinMode": true,
"forceAddress": true,
"isDefaultGateway": true
}
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
namespace: kube-system
name: kube-flannel-ds
labels:
tier: node
app: flannel
spec:
template:
metadata:
labels:
tier: node
app: flannel
spec:
hostNetwork: true
nodeSelector:
beta.kubernetes.io/arch: amd64
serviceAccountName: flannel
containers:
- name: kube-flannel
image: registry.aliyuncs.com/shenshouer/flannel:v0.7.0
command: [ "/opt/bin/flanneld", "--ip-masq", "--kube-subnet-mgr", "--iface=eth0" ]
securityContext:
privileged: true
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: install-cni
image: registry.aliyuncs.com/shenshouer/flannel:v0.7.0
command: [ "/bin/sh", "-c", "set -e -x; cp -f /etc/kube-flannel/cni-conf.json /etc/cni/net.d/10-flannel.conf; while true; do sleep 3600; done" ]
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfgDNS部署
在任意master上执行kubectl create -f skydns.yaml，其中skydns.yaml内容如下
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "KubeDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.100.0.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
spec:
# replicas: not specified here:
# 1. In order to make Addon Manager do not reconcile this replicas parameter.
# 2. Default is 1.
# 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
rollingUpdate:
maxSurge: 10%
maxUnavailable: 0
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
spec:
containers:
- name: kubedns
image: registry.aliyuncs.com/shenshouer/kubedns-amd64:1.9
resources:
# TODO: Set memory limits when we've profiled the container for large
# clusters, then set request = limit to keep this container in
# guaranteed class. Currently, this container falls into the
# "burstable" category so the kubelet doesn't backoff from restarting it.
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
livenessProbe:
httpGet:
path: /healthz-kubedns
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /readiness
port: 8081
scheme: HTTP
# we poll on pod startup for the Kubernetes master service and
# only setup the /readiness HTTP server once that's available.
initialDelaySeconds: 3
timeoutSeconds: 5
args:
- --domain=cluster.local.
- --dns-port=10053
- --config-map=kube-dns
# This should be set to v=2 only after the new image (cut from 1.5) has
# been released, otherwise we will flood the logs.
- --v=0
- --federations=myfederation=federation.test
env:
- name: PROMETHEUS_PORT
value: "10055"
ports:
- containerPort: 10053
name: dns-local
protocol: UDP
- containerPort: 10053
name: dns-tcp-local
protocol: TCP
- containerPort: 10055
name: metrics
protocol: TCP
- name: dnsmasq
image: registry.aliyuncs.com/shenshouer/kube-dnsmasq-amd64:1.4
livenessProbe:
httpGet:
path: /healthz-dnsmasq
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
args:
- --cache-size=1000
- --no-resolv
- --server=127.0.0.1#10053
- --log-facility=-
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
# see: https://github.com/kubernetes/kubernetes/issues/29055 for details
resources:
requests:
cpu: 150m
memory: 10Mi
- name: dnsmasq-metrics
image: registry.aliyuncs.com/shenshouer/dnsmasq-metrics-amd64:1.0
livenessProbe:
httpGet:
path: /metrics
port: 10054
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
args:
- --v=2
- --logtostderr
ports:
- containerPort: 10054
name: metrics
protocol: TCP
resources:
requests:
memory: 10Mi
- name: healthz
image: registry.aliyuncs.com/shenshouer/exechealthz-amd64:1.2
resources:
limits:
memory: 50Mi
requests:
cpu: 10m
# Note that this container shouldn't really need 50Mi of memory. The
# limits are set higher than expected pending investigation on #29688.
# The extra memory was stolen from the kubedns container to keep the
# net memory requested by the pod constant.
memory: 50Mi
args:
- --cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1 >/dev/null
- --url=/healthz-dnsmasq
- --cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1:10053 >/dev/null
- --url=/healthz-kubedns
- --port=8080
- --quiet
ports:
- containerPort: 8080
protocol: TCP
dnsPolicy: Default # Don't use cluster DNS.Node节点安装
Docker安装
新建
/etc/kubernetes/目录|-- kubelet.conf |-- manifests `-- ssl |-- ca-key.pem |-- ca.pem |-- ca.srl |-- worker.csr |-- worker-key.pem |-- worker-openssl.cnf `-- worker.pem新建
/etc/kubernetes/kubelet.conf配置，参考kubelet.conf配置新建
/etc/kubernetes/ssl，证书制作参考worker证书制作新建
/etc/kubernetes/manifests新建
/opt/cni/bin,安装CNI参考cni安装步骤安装
kubelet,参考kubelet安装systemctl enable kubelet && systemctl restart kubelet && journalctl -fu kubelet
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