课程内容主要为k8s基础和一些部署实践
集群安装
工具的配置源：
/etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
安装命令
yum install -y kubelet-1.17.17-0 kubectl-1.17.17-0 kubeadm-1.17.17-0
初始化集群
kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.17.17 --pod-network-cidr=10.244.0.0/16
安装网络组件
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: psp.flannel.unprivileged
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
privileged: false
volumes:
- configMap
- secret
- emptyDir
- hostPath
allowedHostPaths:
- pathPrefix: "/etc/cni/net.d"
- pathPrefix: "/etc/kube-flannel"
- pathPrefix: "/run/flannel"
readOnlyRootFilesystem: false
# Users and groups
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
# Privilege Escalation
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
# Capabilities
allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
defaultAddCapabilities: []
requiredDropCapabilities: []
# Host namespaces
hostPID: false
hostIPC: false
hostNetwork: true
hostPorts:
- min: 0
max: 65535
# SELinux
seLinux:
# SELinux is unused in CaaSP
rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
rules:
- apiGroups: ['extensions']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames: ['psp.flannel.unprivileged']
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-system
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni-plugin
#image: flannelcni/flannel-cni-plugin:v1.0.1 for ppc64le and mips64le (dockerhub limitations may apply)
image: rancher/mirrored-flannelcni-flannel-cni-plugin:v1.0.1
command:
- cp
args:
- -f
- /flannel
- /opt/cni/bin/flannel
volumeMounts:
- name: cni-plugin
mountPath: /opt/cni/bin
- name: install-cni
#image: flannelcni/flannel:v0.17.0 for ppc64le and mips64le (dockerhub limitations may apply)
image: rancher/mirrored-flannelcni-flannel:v0.17.0
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
#image: flannelcni/flannel:v0.17.0 for ppc64le and mips64le (dockerhub limitations may apply)
image: rancher/mirrored-flannelcni-flannel:v0.17.0
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: EVENT_QUEUE_DEPTH
value: "5000"
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: xtables-lock
mountPath: /run/xtables.lock
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni-plugin
hostPath:
path: /opt/cni/bin
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
kubectl create -f 命令即可
删除污点
kubectl get nodes 查看节点
kubectl taint nodes 节点名称 node-role.kubernetes.io/master:NoSchedule-
k8s部署的三板斧：Pod Deployment Service
高可用的要求
- 冗余： 多副本部署 – Deployment
- 负载均衡 – Service
k8s中部署分布式UI自动化的浏览器集群
hub.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: selenium-hub
labels:
name: selenium-hub
spec:
replicas: 1
selector:
matchLabels:
name: selenium-hub
template:
metadata:
labels:
name: selenium-hub
spec:
containers:
- name: selenium-hub
image: selenium/hub:4.0.0-rc-2-prerelease-20210923
imagePullPolicy: IfNotPresent
ports:
- containerPort: 4444
- containerPort: 4442
- containerPort: 4443
- containerPort: 5557
env:
- name: TZ
value: "Asia/Shanghai"
volumeMounts:
- mountPath: "/etc/localtime"
name: "host-time"
livenessProbe:
httpGet:
path: /grid/console
port: 4444
initialDelaySeconds: 30
timeoutSeconds: 1
periodSeconds: 5
failureThreshold: 3
readinessProbe:
httpGet:
path: /grid/console
port: 4444
initialDelaySeconds: 30
timeoutSeconds: 1
periodSeconds: 5
failureThreshold: 3
volumes:
- name: "host-time"
hostPath:
path: "/etc/localtime"
---
apiVersion: v1
kind: Service
metadata:
name: selenium-hub
labels:
name: selenium-hub
spec:
type: NodePort
ports:
- name: port1
protocol: TCP
port: 4442
targetPort: 4442
- name: port2
protocol: TCP
port: 4443
targetPort: 4443
- name: port3
protocol: TCP
port: 5557
targetPort: 5557
- port: 4444
targetPort: 4444
name: port0
nodePort: 32757
selector:
name: selenium-hub
sessionAffinity: None
node.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: selenium-node-chrome
labels:
name: selenium-node-chrome
spec:
replicas: 2
selector:
matchLabels:
name: selenium-node-chrome
template:
metadata:
labels:
name: selenium-node-chrome
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- topologyKey: kubernetes.io/hostname
labelSelector:
matchLabels:
name: selenium-node-chrome
containers:
- name: selenium-node-chrome
image: selenium/node-chrome:4.0.0-rc-2-prerelease-20210923
imagePullPolicy: IfNotPresent
ports:
- containerPort: 5900
- containerPort: 5553
env:
- name: SE_EVENT_BUS_HOST
value: "selenium-hub"
- name: SE_EVENT_BUS_PUBLISH_PORT
value: "4442"
- name: SE_EVENT_BUS_SUBSCRIBE_PORT
value: "4443"
- name: SE_NODE_MAX_SESSIONS
value: "20"
- name: SE_NODE_OVERRIDE_MAX_SESSIONS
value: "true"
- name: TZ
value: "Asia/Shanghai"
resources:
requests:
memory: "500Mi"
volumeMounts:
- mountPath: "/dev/shm"
name: "dshm"
- mountPath: "/etc/localtime"
name: "host-time"
volumes:
- name: "dshm"
hostPath:
path: "/dev/shm"
- name: "host-time"
hostPath:
path: "/etc/localtime"
---
apiVersion: v1
kind: Service
metadata:
name: selenium-node-chrome
labels:
name: selenium-node-chrome
spec:
type: NodePort
ports:
- port: 5900
targetPort: 5900
name: port0
nodePort: 31002
selector:
name: selenium-node-chrome
sessionAffinity: None