ansible二进制部署k8s集群
K爷 DevOps视角
服务器部署
服务器环境
root@k8s-master1:~# uname -r
4.15.0-112-generic
root@k8s-master1:~# cat /etc/issue
Ubuntu 18.04.4 LTS \n \l基础环境同使用kubeadm部署kubernetes集群
ha-node1与ha-node2安装keepalived与haproxy，虚拟IP为 172.16.1.188，作为apiserver的vip。ha-node1作为master节点，ha-node2作为backup节点。
harbor-node1部署harbor服务，用于存放镜像。
以上服务暂不做详细部署。
部署ansible
k8s-master作为部署服务器
基础环境配置
- 安装python2.7
在master、node、etcd节点安装
# apt-get install python2.7 -y
# ln -s /usr/bin/python2.7 /usr/bin/python- 安装ansible
# apt install ansible- 在ansible控制端配置免密登录
# ssh-keygen- 分发密钥
root@k8s-master1:~# ssh-copy-id 172.16.1.31将密钥分发到master节点、node节点、etcd节点
下载项目
#export release=2.2.0
# curl -C- -fLO --retry 3 https://github.com/easzlab/kubeasz/releases/download/${release}/easzup
# vim easzup
export DOCKER_VER=19.03.12
export KUBEASZ_VER=2.2.0
# chmod +x easzup
# ./easzup -D准备hosts文件
# cd /etc/ansible/
# cp example/hosts.multi-node ./hosts
# vim hosts
# 'etcd' cluster should have odd member(s) (1,3,5,...)
# variable 'NODE_NAME' is the distinct name of a member in 'etcd' cluster
[etcd]
172.16.1.39 NODE_NAME=etcd1
172.16.1.40 NODE_NAME=etcd2
172.16.1.41 NODE_NAME=etcd3
# master node(s)
[kube-master]
172.16.1.30
172.16.1.31
# work node(s)
[kube-node]
172.16.1.33
172.16.1.34
# [optional] harbor server, a private docker registry
# 'NEW_INSTALL': 'yes' to install a harbor server; 'no' to integrate with existed one
# 'SELF_SIGNED_CERT': 'no' you need put files of certificates named harbor.pem and harbor-key.pem in directory 'down'
[harbor]
#172.16.1.8 HARBOR_DOMAIN="harbor.yourdomain.com" NEW_INSTALL=no SELF_SIGNED_CERT=yes
# [optional] loadbalance for accessing k8s from outside
# 外部负载均衡，用于自有环境负载转发 NodePort 暴露的服务等
[ex-lb]
172.16.1.36 LB_ROLE=master EX_APISERVER_VIP=172.16.1.188 EX_APISERVER_PORT=6443
172.16.1.37 LB_ROLE=backup EX_APISERVER_VIP=172.16.1.188 EX_APISERVER_PORT=6443
# [optional] ntp server for the cluster
[chrony]
#172.16.1.1
[all:vars]
# --------- Main Variables ---------------
# Cluster container-runtime supported: docker, containerd
CONTAINER_RUNTIME="docker"
# Network plugins supported: calico, flannel, kube-router, cilium, kube-ovn
CLUSTER_NETWORK="flannel"
# Service proxy mode of kube-proxy: 'iptables' or 'ipvs'
PROXY_MODE="ipvs"
# K8S Service CIDR, not overlap with node(host) networking
SERVICE_CIDR="172.20.0.0/16"
# Cluster CIDR (Pod CIDR), not overlap with node(host) networking
CLUSTER_CIDR="10.20.0.0/16"
# NodePort Range
NODE_PORT_RANGE="30000-60000"
# Cluster DNS Domain
CLUSTER_DNS_DOMAIN="kevin.local."
# -------- Additional Variables (don't change the default value right now) ---
# Binaries Directory
bin_dir="/usr/bin"
# CA and other components cert/key Directory
ca_dir="/etc/kubernetes/ssl"
# Deploy Directory (kubeasz workspace)
base_dir="/etc/ansible"网络以flannel为例，可以更改为calico
按步骤部署
环境初始化
root@k8s-master1:/etc/ansible# vim 01.prepare.yml
# [optional] to synchronize system time of nodes with 'chrony'
- hosts:
- kube-master
- kube-node
- etcd
# - ex-lb
# - chrony
roles:
- { role: chrony, when: "groups['chrony']|length > 0" }
# to create CA, kubeconfig, kube-proxy.kubeconfig etc.
- hosts: localhost
roles:
- deploy
# prepare tasks for all nodes
- hosts:
- kube-master
- kube-node
- etcd
roles:
- prepare
root@k8s-master1:/etc/ansible# apt install python-pip
root@k8s-master1:/etc/ansible# ansible-playbook 01.prepare.yml安装etcd
root@k8s-master1:/etc/ansible# ansible-playbook 02.etcd.yml- 各etcd服务器验证etcd服务
root@etc-node1:~# export NODE_IPS="172.16.1.39 172.16.1.40 172.16.1.41"
root@etc-node1:~# for ip in ${NODE_IPS};do /usr/bin/etcdctl --endpoints=https://${ip}:2379 --cacert=/etc/kubernetes/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem endpoint health;done
https://172.16.1.39:2379 is healthy: successfully committed proposal: took = 11.288725ms
https://172.16.1.40:2379 is healthy: successfully committed proposal: took = 14.079052ms
https://172.16.1.41:2379 is healthy: successfully committed proposal: took = 13.639416ms安装docker
docker部署同使用kubeadm部署kubernetes集群。
部署master
root@k8s-master1:/etc/ansible# ansible-playbook 04.kube-master.yml
root@k8s-master1:/etc/ansible# kubectl get node
NAME STATUS ROLES AGE VERSION
172.16.1.30 Ready,SchedulingDisabled master 65s v1.17.2
172.16.1.31 Ready,SchedulingDisabled master 65s v1.17.2部署node
- 配置镜像
# docker pull mirrorgooglecontainers/pause-amd64:3.1
# docker tag mirrorgooglecontainers/pause-amd64:3.1 harbor.kevin.com/base/pause-amd64:3.1
# docker push harbor.kevin.com/base/pause-amd64:3.1- 修改镜像地址
root@k8s-master1:/etc/ansible# vim roles/kube-node/defaults/main.yml
# 基础容器镜像
SANDBOX_IMAGE: "harbor.kevin.com/base/pause-amd64:3.1"
root@k8s-master1:/etc/ansible# ansible-playbook 05.kube-node.yml
root@k8s-master1:/etc/ansible# kubectl get node
NAME STATUS ROLES AGE VERSION
172.16.1.30 Ready,SchedulingDisabled master 16m v1.17.2
172.16.1.31 Ready,SchedulingDisabled master 16m v1.17.2
172.16.1.33 Ready node 10s v1.17.2
172.16.1.34 Ready node 10s v1.17.2部署网络组件
root@k8s-master1:/etc/ansible# ansible-playbook 06.network.yml- 验证网络
root@k8s-master1:~# kubectl run net-test1 --image=alpine --replicas=3 sleep 360000
\kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/net-test1 created
root@k8s-master1:~# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
net-test1-5fcc69db59-67gtx 1/1 Running 0 37s 10.20.2.3 172.16.1.33 <none> <none>
net-test1-5fcc69db59-skpfl 1/1 Running 0 37s 10.20.2.2 172.16.1.33 <none> <none>
net-test1-5fcc69db59-w4chj 1/1 Running 0 37s 10.20.3.2 172.16.1.34 <none> <none>
root@k8s-master1:~# kubectl exec -it net-test1-5fcc69db59-67gtx sh
/ # ping 10.20.3.2
PING 10.20.3.2 (10.20.3.2): 56 data bytes
64 bytes from 10.20.3.2: seq=0 ttl=62 time=1.272 ms
64 bytes from 10.20.3.2: seq=1 ttl=62 time=0.449 ms
^C
--- 10.20.3.2 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.449/0.860/1.272 ms
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=127 time=112.847 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 1 packets received, 50% packet loss
round-trip min/avg/max = 112.847/112.847/112.847 ms网络通之后，k8s底层就好了
添加master节点
root@k8s-master1:~# easzctl add-master 172.16.1.32
root@k8s-master1:~# kubectl get node
NAME STATUS ROLES AGE VERSION
172.16.1.30 Ready,SchedulingDisabled master 46h v1.17.2
172.16.1.31 Ready,SchedulingDisabled master 46h v1.17.2
172.16.1.32 Ready,SchedulingDisabled master 3m28s v1.17.2
172.16.1.33 Ready node 45h v1.17.2
172.16.1.34 Ready node 45h v1.17.2添加node节点
root@k8s-master1:~# easzctl add-node 172.16.1.35
root@k8s-master1:~# kubectl get node
NAME STATUS ROLES AGE VERSION
172.16.1.30 Ready,SchedulingDisabled master 46h v1.17.2
172.16.1.31 Ready,SchedulingDisabled master 46h v1.17.2
172.16.1.32 Ready,SchedulingDisabled master 11m v1.17.2
172.16.1.33 Ready node 46h v1.17.2
172.16.1.34 Ready node 46h v1.17.2
172.16.1.35 Ready node 3m44s v1.17.2DNS服务
目前常用的dns组件有kube-dns和coredns两个，这里以安装CoreDNS
部署coreDNS
root@k8s-master1:~# mkdir /opt/dns/
root@k8s-master1:~# cd /opt/dns/
root@k8s-master1:/opt/dns# git clone https://github.com/coredns/deployment.git
root@k8s-master1:/opt/dns# cd deployment/kubernetes/
root@k8s-master1:/opt/dns/deployment/kubernetes# ./deploy.sh >/opt/dns/coredns.yml
root@k8s-master1:/opt/dns/deployment/kubernetes# cd /opt/dns/
root@k8s-master1:/opt/dns# docker pull coredns/coredns:1.7.0
root@k8s-master1:/opt/dns# docker tag coredns/coredns:1.7.0 harbor.kevin.com/base/coredns:1.7.0
root@k8s-master1:/opt/dns# docker push harbor.kevin.com/base/coredns:1.7.0
root@k8s-master1:/opt/dns# vim coredns.yml
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes kevin.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . 223.6.6.6 {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: harbor.kevin.com/base/coredns:1.7.0
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 512Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 172.20.0.2
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
root@k8s-master1:/opt/dns# kubectl delete -f kube-dns.yaml
root@k8s-master1:/opt/dns# kubectl apply -f coredns.ym部署dashboard
部署同使用kubeadm部署kubernetes集群。