Centos7 下Kubernetes集群安装部署

avatar 2021年4月22日18:18:28 评论 720 次浏览

前面已经Kubernetes的基础，原理，以及组件和组件的作用。这个章节我们就说一下Kubernetes的安装，如果安装Kubernetes，这里说明一下我自己的机器不够所以我就把etcd安装在master节点上了，如果在生产环境中注意不要把etcd和master节点安装在一起。

安装前准备

首先同步三台服务器的时间

[root@Serve01 ~]#  yum -y install ntpdate
[root@Serve01 ~]# ntpdate -u cn.pool.ntp.org 
[root@Serve02 ~]# yum -y install ntpdate
[root@Serve02 ~]# ntpdate -u cn.pool.ntp.org
[root@Serve03 ~]# yum -y install ntpdate
[root@Serve03 ~]# ntpdate -u cn.pool.ntp.org

在node节点上安装redhat-ca.crt

[root@Serve02 ~]# yum install *rhsm* -y    
[root@Serve03 ~]# yum install *rhsm* -y

master节点安装kubernetes etcd

[root@Serve01 ~]# yum -y install kubernetes-master etcd

配置master节点etcd

[root@Serve01 ~]# vim /etc/etcd/etcd.conf

#[Member]
#ETCD_CORS=""
ETCD_DATA_DIR="/var/lib/etcd/etcd1.etcd"
#ETCD_WAL_DIR=""
ETCD_LISTEN_PEER_URLS="http://10.211.55.16:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.211.55.16:2379,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://10.211.55.16:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://10.211.55.16:2379"
#ETCD_DISCOVERY=""
#ETCD_DISCOVERY_FALLBACK="proxy"
#ETCD_DISCOVERY_PROXY=""
#ETCD_DISCOVERY_SRV=""
ETCD_INITIAL_CLUSTER="etcd1=http://10.211.55.16:2380,etcd2=http://10.211.55.17:2380,etcd3=http://10.211.55.18:2380"
#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
#ETCD_INITIAL_CLUSTER_STATE="new"
.........................................

配置node节点安装部署kubernetes-node/etcd/flannel/docker

[root@Serve02 ~]# yum -y install kubernetes-node etcd flannel docker
[root@Serve03 ~]# yum -y install kubernetes-node etcd flannel docker

nodes节点配置etcd，node1和node2一样方法

[root@Serve02 ~]# vim /etc/etcd/etcd.conf 
#[Member]
#ETCD_CORS=""
ETCD_DATA_DIR="/var/lib/etcd/etcd2.etcd"
#ETCD_WAL_DIR=""
ETCD_LISTEN_PEER_URLS="http://10.211.55.17:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.211.55.17:2379,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://10.211.55.17:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://10.211.55.17:2379"
#ETCD_DISCOVERY=""
#ETCD_DISCOVERY_FALLBACK="proxy"
#ETCD_DISCOVERY_PROXY=""
#ETCD_DISCOVERY_SRV=""
ETCD_INITIAL_CLUSTER="etcd1=http://10.211.55.16:2380,etcd2=http://10.211.55.17:2380,etcd3=http://10.211.55.18:2380"
#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
#ETCD_INITIAL_CLUSTER_STATE="new"
....................................
[root@Serve03 ~]# vim /etc/etcd/etcd.conf 
#[Member]
#ETCD_CORS=""
ETCD_DATA_DIR="/var/lib/etcd/etcd3.etcd"
#ETCD_WAL_DIR=""
ETCD_LISTEN_PEER_URLS="http://10.211.55.18:2380"
ETCD_LISTEN_CLIENT_URLS="http://10.211.55.18:2379,http://127.0.0.1:2379"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
ETCD_NAME="etcd3"
#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://10.211.55.18:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://10.211.55.18:2379"
#ETCD_DISCOVERY=""
#ETCD_DISCOVERY_FALLBACK="proxy"
#ETCD_DISCOVERY_PROXY=""
#ETCD_DISCOVERY_SRV=""
ETCD_INITIAL_CLUSTER="etcd1=http://10.211.55.16:2380,etcd2=http://10.211.55.17:2380,etcd3=http://10.211.55.18:2380"
#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
#ETCD_INITIAL_CLUSTER_STATE="new"
..............................................

启动etcd，三台分别启动，启动之前需要先关闭防火墙，要不请求超时

[root@Serve01 ~]# systemctl start etcd.service 
[root@Serve02 ~]# systemctl start etcd.service  
[root@Serve03 ~]# systemctl start etcd.service

nodes重启kubernetes-node

[root@Serve02 ~]# systemctl start kubelet   
[root@Serve03 ~]# systemctl start kubelet

查看启动日志

journalctl -xefu kubelet
nodes重启docker
systemctl start docker.service

nodes重启flanneld
systemctl enable flanneld.service
systemctl start flanneld.service

启动kube-master

[root@Serve01 ~]# systemctl start kube-apiserver
[root@Serve01 ~]# systemctl start kube-controller-manager
[root@Serve01 ~]#  systemctl start kube-scheduler
[root@Serve01 ~]# systemctl enable kube-apiserver
ln -s '/usr/lib/systemd/system/kube-apiserver.service' '/etc/systemd/system/multi-user.target.wants/kube-apiserver.service'
[root@Serve01 ~]# systemctl enable kube-controller-manager
ln -s '/usr/lib/systemd/system/kube-controller-manager.service' '/etc/systemd/system/multi-user.target.wants/kube-controller-manager.service'
[root@Serve01 ~]# systemctl enable kube-scheduler
ln -s '/usr/lib/systemd/system/kube-scheduler.service' '/etc/systemd/system/multi-user.target.wants/kube-scheduler.service'
[root@Serve01 ~]#

检查一下etcd集群状态

[root@Serve01 ~]# kubectl get nodes
NAME           STATUS    AGE
10.211.55.17   Ready     3h
10.211.55.18   Ready     3h
[root@Serve01 ~]# etcdctl  member list
624ca8b470886bb8: name=etcd1 peerURLs=http://10.211.55.16:2380 clientURLs=http://10.211.55.16:2379 isLeader=false
979db527c07d3884: name=etcd3 peerURLs=http://10.211.55.18:2380 clientURLs=http://10.211.55.18:2379 isLeader=false
ea7f70db8857f25e: name=etcd2 peerURLs=http://10.211.55.17:2380 clientURLs=http://10.211.55.17:2379 isLeader=true
[root@Serve01 ~]# etcdctl cluster-health
member 624ca8b470886bb8 is healthy: got healthy result from http://10.211.55.16:2379
member 979db527c07d3884 is healthy: got healthy result from http://10.211.55.18:2379
member ea7f70db8857f25e is healthy: got healthy result from http://10.211.55.17:2379
cluster is healthy

现在2个节点上手动下载pod images，以及测试使用的nginx images

[root@Serve02 ~]# docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest
Trying to pull repository registry.access.redhat.com/rhel7/pod-infrastructure ... 
latest: Pulling from registry.access.redhat.com/rhel7/pod-infrastructure
26e5ed6899db: Pull complete 
66dbe984a319: Pull complete 
9138e7863e08: Pull complete 
Digest: sha256:92d43c37297da3ab187fc2b9e9ebfb243c1110d446c783ae1b989088495db931
Status: Downloaded newer image for registry.access.redhat.com/rhel7/pod-infrastructure:latest
[root@Serve02 ~]# docker pull  nginx
Using default tag: latest
Trying to pull repository docker.io/library/nginx ... 
latest: Pulling from docker.io/library/nginx
743f2d6c1f65: Pull complete 
6bfc4ec4420a: Pull complete 
688a776db95f: Pull complete 
Digest: sha256:23b4dcdf0d34d4a129755fc6f52e1c6e23bb34ea011b315d87e193033bcd1b68
Status: Downloaded newer image for docker.io/nginx:latest
[root@Serve02 ~]# 

[root@Serve03 ~]# docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest                                     Trying to pull repository registry.access.redhat.com/rhel7/pod-infrastructure ... 
latest: Pulling from registry.access.redhat.com/rhel7/pod-infrastructure
26e5ed6899db: Pull complete 
66dbe984a319: Pull complete 
9138e7863e08: Pull complete 
Digest: sha256:92d43c37297da3ab187fc2b9e9ebfb243c1110d446c783ae1b989088495db931
Status: Downloaded newer image for registry.access.redhat.com/rhel7/pod-infrastructure:latest
[root@Serve03 ~]# docker pull  nginx
Using default tag: latest
Trying to pull repository docker.io/library/nginx ... 
latest: Pulling from docker.io/library/nginx
743f2d6c1f65: Pull complete 
6bfc4ec4420a: Pull complete 
688a776db95f: Pull complete 
Digest: sha256:23b4dcdf0d34d4a129755fc6f52e1c6e23bb34ea011b315d87e193033bcd1b68
Status: Downloaded newer image for docker.io/nginx:latest

运行nginx

[root@Serve01 ~]# kubectl  run my-nginx --image=nginx --replicas=2 --port=80
deployment "my-nginx" created

查看一下node的镜像

[root@Serve02 ~]# docker images
REPOSITORY                                            TAG                 IMAGE ID            CREATED             SIZE
docker.io/nginx                                       latest              53f3fd8007f7        13 days ago         109 MB
registry.access.redhat.com/rhel7/pod-infrastructure   latest              99965fb98423        19 months ago       209 MB
[root@Serve03 ~]# docker images 
REPOSITORY                                            TAG                 IMAGE ID            CREATED             SIZE
docker.io/nginx                                       latest              53f3fd8007f7        13 days ago         109 MB
registry.access.redhat.com/rhel7/pod-infrastructure   latest              99965fb98423        19 months ago       209 MB

现在Kubernete集群已经安装好了，其实，现在有很多利用脚本写的Kubernete安装方法已经很成熟了，只是版本的问题，不过如果我们在生产环境中使用不建议使用太新的版本，因为旧版本使用的第一是比较多，出现的漏洞等等都已修复，出现的问题解决方法在网上有很多，可以帮助我们在以后的工作中或者学习中学习更多问题解决方法。下面介绍一下利用ansible安装Kubernete的方法，先看一下https://github.com/wolf27w/kubeasz，我们根据规划配置，从0到7安装，有兴趣的可以了解一下，这里就不多说了

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