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k8s安装部署
更新时间 2020-9-21 浏览2136次
k8s安装部署
Kubernetes集群组件:
- etcd 一个高可用的K/V键值对存储和服务发现系统
- flannel 实现夸主机的容器网络的通信
- kube-apiserver 提供kubernetes集群的API调用
- kube-controller-manager 确保集群服务
- kube-scheduler 调度容器，分配到Node
- kubelet 在Node节点上按照配置文件中定义的容器规格启动容器
- kube-proxy 提供网络代理服务
master: etcd：提供分布式数据存储的数据库吧，用于持久化存储k8s集群的配置和状态 kube-apiserver：api service提供了http rest接口，是整个集群的入口，K8s其它组件之间不直接通信，而是通过API server通信的。（只有API server连接了etcd，即其它组件更新K8s集群的状态时，只能通过API server读写etcd中的数据） kube-scheduler：scheduler负责资源的调度 kube-controller-manager：整个集群的管理控制中心，此组件里面是由多个控制器组成的，如：Replication Manager（管理ReplicationController 资源），ReplicaSet Controller，PersistentVolume controller。主要作用用来复制组件、追踪工作结点状态、处理失败结点。 node: flannel：好像是用来支持网络通信的吧 kube-proxy：用来负载均衡网络流量 kubelet：用来管理node节点机上的容器 docker：运行项目镜像容器的组件
1、准备机器节点如下：192.168.1.102、192.168.1.103
所有机器上执行以下命令，准备安装环境：(注意是所有机器，主机master，从机node都要安装)
1.1、安装epel-release源（可选）
yum -y install epel-release
这个软件包会自动配置yum的软件仓库。
1.2 所有机器关闭防火墙（实现服务之间通信：Flannel 0.7.0需要关闭防火墙,并连接网络。)
systemctl stop firewalld systemctl disable firewalld setenforce 0#查看防火墙状态 firewall-cmd --state not running
现在开始master主机上192.168.1.102安装kubernetes Master 使用yum安装etcd、kubernetes-master
yum -y install etcd kubernetes-master
============================================================================================================================================= 安装 2 软件包 (+1 依赖软件包) 总下载量：49 M 安装大小：269 M Downloading packages: (1/3): etcd-3.3.11-2.el7.centos.x86_64.rpm | 10 MB 00:00:01 (2/3): kubernetes-client-1.5.2-0.7.git269f928.el7.x86_64.rpm | 14 MB 00:00:01 (3/3): kubernetes-master-1.5.2-0.7.git269f928.el7.x86_64.rpm | 25 MB 00:00:02 --------------------------------------------------------------------------------------------------------------------------------------------- 总计 17 MB/s | 49 MB 00:00:02 Running transaction check Running transaction test Transaction test succeeded Running transaction 正在安装 : kubernetes-client-1.5.2-0.7.git269f928.el7.x86_64 1/3 正在安装 : kubernetes-master-1.5.2-0.7.git269f928.el7.x86_64 2/3 正在安装 : etcd-3.3.11-2.el7.centos.x86_64 3/3 验证中 : kubernetes-client-1.5.2-0.7.git269f928.el7.x86_64 1/3 验证中 : kubernetes-master-1.5.2-0.7.git269f928.el7.x86_64 2/3 验证中 : etcd-3.3.11-2.el7.centos.x86_64 3/3 已安装: etcd.x86_64 0:3.3.11-2.el7.centos kubernetes-master.x86_64 0:1.5.2-0.7.git269f928.el7 作为依赖被安装: kubernetes-client.x86_64 0:1.5.2-0.7.git269f928.el7 完毕！
编辑：vi /etc/etcd/etcd.conf文件，修改结果如下：
#[Member] #ETCD_CORS="" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" #ETCD_WAL_DIR="" #ETCD_LISTEN_PEER_URLS=" #监听地址 ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379" #ETCD_MAX_SNAPSHOTS="5" #ETCD_MAX_WALS="5" #名称 ETCD_NAME="default" #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=" #url ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379" #ETCD_DISCOVERY="" #ETCD_DISCOVERY_FALLBACK="proxy" #ETCD_DISCOVERY_PROXY="" #ETCD_DISCOVERY_SRV="" #ETCD_INITIAL_CLUSTER="default=http://localhost:2380" #ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #ETCD_INITIAL_CLUSTER_STATE="new" #ETCD_STRICT_RECONFIG_CHECK="true" #ETCD_ENABLE_V2="true" # #[Proxy] #ETCD_PROXY="off" #ETCD_PROXY_FAILURE_WAIT="5000" #ETCD_PROXY_REFRESH_INTERVAL="30000" #ETCD_PROXY_DIAL_TIMEOUT="1000"
vi /etc/kubernetes/apiserver文件，配置结果如下：
### #内容包括：绑定主机的IP地址、端口号、etcd服务地址、Service所需的Cluster IP池、一系列admission控制策略等 # 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="--insecure-bind-address=0.0.0.0" # The port on the local server to listen on. KUBE_API_PORT="--port=8080" # Port minions listen on KUBELET_PORT="--kubelet-port=10250" # Comma separated list of nodes in the etcd cluster KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379" # Address range to use for services KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16" # default admission control policies,此处删除了ServiceAccount KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota" # Add your own! KUBE_API_ARGS="" ~
启动etcd、kube-apiserver、kube-controller-manager、kube-scheduler等服务，并设置开机启动。
systemctl start etcd systemctl start kube-apiserver.service systemctl start kube-controller-manager.service systemctl start kube-scheduler.service systemctl enable etcd systemctl enable kube-apiserver.service systemctl enable kube-controller-manager.service systemctl enable kube-scheduler.service
上面命令也可通过下面命令代替：
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES ; done
在etcd中定义flannel网络
[root@localhost ~]# etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'
{"Network":"172.17.0.0/16"}
[root@localhost ~]#接下来在node节点上执行：
在node机上192.168.1.103安装kubernetes Node和flannel组件应用
yum -y install flannel kubernetes-node
错误：docker-ce conflicts with 2:docker-1.13.1-162.git64e9980.el7.centos.x86_64 错误：docker-ce-cli conflicts with 2:docker-1.13.1-162.git64e9980.el7.centos.x86_64 您可以尝试添加 --skip-broken 选项来解决该问题 您可以尝试执行：rpm -Va --nofiles --nodigest [root@localhost ~]# yum list installed | grep docker containerd.io.x86_64 1.2.13-3.2.el7 @docker-ce-stable docker-ce.x86_64 3:19.03.12-3.el7 @docker-ce-stable docker-ce-cli.x86_64 1:19.03.12-3.el7 @docker-ce-stable [root@localhost ~]# yum remove -y docker-ce.x86_64 [root@localhost ~]# yum remove -y docker-ce-cli.x86_64
yum -y install flannel kubernetes-node
为flannel网络指定etcd服务，修改/etc/sysconfig/flanneld文件，配置结果如下：
# Flanneld configuration options # etcd url location. Point this to the server where etcd runs,和Flannel组件有关，改为master的ip:2379 FLANNEL_ETCD_ENDPOINTS="http://192.168.1.102:2379" # etcd config key. This is the configuration key that flannel queries # For address range assignment FLANNEL_ETCD_PREFIX="/atomic.io/network" # Any additional options that you want to pass #FLANNEL_OPTIONS=""
修改vi /etc/kubernetes/config文件
### # 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=false" # How the controller-manager, scheduler, and proxy find the apiserver #修改为master的ip KUBE_MASTER="--master=http://192.168.1.102:8080"
修改node机的kubelet配置文件/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)改成0.0.0.0 KUBELET_ADDRESS="--address=0.0.0.0" # The port for the info server to serve on KUBELET_PORT="--port=10250" # You may leave this blank to use the actual hostname 本机ip KUBELET_HOSTNAME="--hostname-override=192.168.1.103" # location of the api-server master ip地址 KUBELET_API_SERVER="--api-servers=http://192.168.1.102:8080" # pod infrastructure container KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest" # Add your own! KUBELET_ARGS=""
node节点机上启动kube-proxy,kubelet,docker,flanneld等服务，并设置开机启动。
for SERVICES in kube-proxy kubelet docker flanneld;do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done
[root@localhost ~]# for SERVICES in kube-proxy kubelet docker flanneld;do systemctl restart $SERVICES;systemctl enable $SERVICES;systemctl status $SERVICES; done Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service. ● kube-proxy.service - Kubernetes Kube-Proxy Server Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled) Active: active (running) since 日 2020-09-13 08:07:45 CST; 253ms ago Docs: https://github.com/GoogleCloudPlatform/kubernetes Main PID: 3866 (kube-proxy) CGroup: /system.slice/kube-proxy.service ├─3866 /usr/bin/kube-proxy --logtostderr=true --v=0 --master=http://192.168.1.102:8080 └─3890 iptables -w -C OUTPUT -t nat -m comment --comment handle ClusterIPs; NOTE: this must be before the NodePort rules -j KUB... 9月 13 08:07:45 localhost.localdomain systemd[1]: Started Kubernetes Kube-Proxy Server. 9月 13 08:07:45 localhost.localdomain kube-proxy[3866]: E0913 08:07:45.362710 3866 server.go:421] Can't get Node "localhost.loca... found 9月 13 08:07:45 localhost.localdomain kube-proxy[3866]: I0913 08:07:45.365496 3866 server.go:215] Using iptables Proxier. 9月 13 08:07:45 localhost.localdomain kube-proxy[3866]: W0913 08:07:45.368580 3866 server.go:468] Failed to retrieve node info: ... found 9月 13 08:07:45 localhost.localdomain kube-proxy[3866]: W0913 08:07:45.368682 3866 proxier.go:248] invalid nodeIP, initialize ku...nodeIP 9月 13 08:07:45 localhost.localdomain kube-proxy[3866]: W0913 08:07:45.368689 3866 proxier.go:253] clusterCIDR not specified, un...raffic 9月 13 08:07:45 localhost.localdomain kube-proxy[3866]: I0913 08:07:45.368699 3866 server.go:227] Tearing down userspace rules. Hint: Some lines were ellipsized, use -l to show in full. Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service. ● kubelet.service - Kubernetes Kubelet Server Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled) Active: active (running) since 日 2020-09-13 08:07:46 CST; 150ms ago Docs: https://github.com/GoogleCloudPlatform/kubernetes Main PID: 4150 (kubelet) CGroup: /system.slice/kubelet.service └─4150 /usr/bin/kubelet --logtostderr=true --v=0 --api-servers=http://192.168.1.102:8080 --address=0.0.0.0 --port=10250 --hostn... 9月 13 08:07:46 localhost.localdomain systemd[1]: Started Kubernetes Kubelet Server. Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service. ● docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled) Drop-In: /usr/lib/systemd/system/docker.service.d └─flannel.conf Active: active (running) since 日 2020-09-13 08:07:49 CST; 139ms ago Docs: http://docs.docker.com Main PID: 4238 (dockerd-current) CGroup: /system.slice/docker.service ├─4238 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc... └─4243 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 -... 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.295365720+08:00" level=warning msg="overlay2: the ... 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.340199748+08:00" level=info msg="Graph migrat...onds" 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.340686273+08:00" level=info msg="Loading cont...art." 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.347235461+08:00" level=info msg="Firewalld ru...alse" 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.417613975+08:00" level=info msg="Default brid...ress" 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.435988926+08:00" level=info msg="Loading cont...one." 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.443345913+08:00" level=info msg="Daemon has c...tion" 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.443359161+08:00" level=info msg="Docker daemo....13.1 9月 13 08:07:49 localhost.localdomain systemd[1]: Started Docker Application Container Engine. 9月 13 08:07:49 localhost.localdomain dockerd-current[4238]: time="2020-09-13T08:07:49.453920665+08:00" level=info msg="API listen o...sock" Hint: Some lines were ellipsized, use -l to show in full. Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. Created symlink from /etc/systemd/system/docker.service.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service. ● flanneld.service - Flanneld overlay address etcd agent Loaded: loaded (/usr/lib/systemd/system/flanneld.service; enabled; vendor preset: disabled) Active: active (running) since 日 2020-09-13 08:07:49 CST; 175ms ago Main PID: 4400 (flanneld) CGroup: /system.slice/flanneld.service └─4400 /usr/bin/flanneld -etcd-endpoints=http://192.168.1.102:2379 -etcd-prefix=/atomic.io/network 9月 13 08:07:49 localhost.localdomain systemd[1]: Starting Flanneld overlay address etcd agent... 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.776700 4400 main.go:132] Installing signal handlers 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.777052 4400 manager.go:136] Determining IP address of ...rface 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.783183 4400 manager.go:149] Using interface with name ...1.103 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.783212 4400 manager.go:166] Defaulting external addres....103) 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.799237 4400 local_manager.go:179] Picking subnet in ra...255.0 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.854985 4400 manager.go:250] Lease acquired: 172.17.29.0/24 9月 13 08:07:49 localhost.localdomain flanneld-start[4400]: I0913 08:07:49.860685 4400 network.go:98] Watching for new subnet leases 9月 13 08:07:49 localhost.localdomain systemd[1]: Started Flanneld overlay address etcd agent. Hint: Some lines were ellipsized, use -l to show in full. [root@localhost ~]#
然后在master上执行
[root@localhost ~]# kubectl get nodes NAME STATUS AGE 192.168.1.103 Ready 1m [root@localhost ~]#