菜鸟系列k8s——k8s集群部署(2)
2019-05-22 19:25
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k8s集群部署
1. 角色分配
角色 | IP | 安装组件 |
---|---|---|
k8s-master | 10.0.0.170 | kube-apiserver,kube-controller-manager,kube-scheduler,etcd |
k8s-node0 | 10.0.0.113 | kubelet,kube-proxy,docker,flannel,etcd |
k8s-node1 | 10.0.0.56 | kubelet,kube-proxy,docker,flannel,etcd |
2. 环境预备
#系统更新 sudo yum install -y epel-release; sudo yum update -y sudo apt-get install -y epel-release; sudo apt-get update -y
3. 下载组件
链接:https://pan.baidu.com/s/1cOUJyQ8tuT_lT4a1ofY1Jw 提取码:6n31
4. cfssl安装
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64 mv cfssl_linux-amd64 /usr/local/bin/cfssl mv cfssljson_linux-amd64 /usr/local/bin/cfssljson mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo
5. etcd集群部署
Etcd是Kubernetes集群中的一个十分重要的组件,用于保存集群所有的网络配置和对象的状态信息
5.1 etcd证书生成
- etcd ca配置
cat << EOF | tee ca-config.json { "signing": { "default": { "expiry": "87600h" }, "profiles": { "etcd": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } EOF
- etcd ca证书
cat << EOF | tee ca-csr.json { "CN": "etcd CA", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing" } ] } EOF
- etcd server证书
cat << EOF | tee server-csr.json { "CN": "etcd", "hosts": [ "10.0.0.170", "10.0.0.113", "10.0.0.56" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing" } ] } EOF
生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=etcd server-csr.json | cfssljson -bare server [centos@jiliguo ssl]$ ls ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem server.csr server-csr.json server-key.pem server.pem
5.2 etcd安装
- 解压缩
tar -xvf etcd-v3.3.10-linux-amd64.tar.gz cd etcd-v3.3.10-linux-amd64/ cp etcd etcdctl /k8s/etcd/bin/
- 配置etcd配置文件
vim /k8s/etcd/cfg/etcd.conf #[Member] ETCD_NAME="etcd01" ETCD_DATA_DIR="/data1/etcd" ETCD_LISTEN_PEER_URLS="https://10.0.0.170:2380" ETCD_LISTEN_CLIENT_URLS="https://10.0.0.170:2379,https://127.0.0.1:2379" #[Clustering] ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.0.0.170:2380" ETCD_ADVERTISE_CLIENT_URLS="https://10.0.0.170:2379" ETCD_INITIAL_CLUSTER="etcd01=https://10.0.0.170:2380,etcd02=https://10.0.0.113:2380,etcd03=https://10.0.0.56:2380" ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" ETCD_INITIAL_CLUSTER_STATE="new" #[Security] ETCD_CERT_FILE="/k8s/etcd/ssl/server.pem" ETCD_KEY_FILE="/k8s/etcd/ssl/server-key.pem" ETCD_TRUSTED_CA_FILE="/k8s/etcd/ssl/ca.pem" ETCD_CLIENT_CERT_AUTH="true" ETCD_PEER_CERT_FILE="/k8s/etcd/ssl/server.pem" ETCD_PEER_KEY_FILE="/k8s/etcd/ssl/server-key.pem" ETCD_PEER_TRUSTED_CA_FILE="/k8s/etcd/ssl/ca.pem" ETCD_PEER_CLIENT_CERT_AUTH="true"
- 配置etcd启动文件
mkdir /data1/etcd vim /usr/lib/systemd/system/etcd.service [Unit] Description=Etcd Server After=network.target After=network-online.target Wants=network-online.target [Service] Type=notify WorkingDirectory=/data1/etcd/ EnvironmentFile=-/k8s/etcd/cfg/etcd.conf ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /k8s/etcd/bin/etcd" Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target
5.2 etcd集群测试
[centos@jiliguo etcd]$ sudo /k8s/etcd/bin/etcdctl --ca-file=/k8s/etcd/ssl/ca.pem --cert-file=/k8s/etcd/ssl/server.pem --key-file=/k8s/etcd/ssl/server-key.pem --endpoints="https://10.0.0.170:2379,https://10.0.0.113:2379,https://10.0.0.56:2379" cluster-health member 5369b6e78dc66d92 is healthy: got healthy result from https://10.0.0.113:2379 member aa55e29e6ec202ab is healthy: got healthy result from https://10.0.0.170:2379 member b5010a06fcd898a8 is healthy: got healthy result from https://10.0.0.56:2379
6. kubernets证书与私钥
- kubernetes ca证书
cat << EOF | tee ca-config.json { "signing": { "default": { "expiry": "87600h" }, "profiles": { "kubernetes": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } EOF cat << EOF | tee ca-csr.json { "CN": "kubernetes", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing", "O": "k8s", "OU": "System" } ] } EOF cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
- apiserver证书
cat << EOF | tee server-csr.json { "CN": "kubernetes", "hosts": [ "10.254.0.1", "127.0.0.1", "10.0.0.170", "10.0.0.113", "10.0.0.56", "kubernetes", "kubernetes.default", "kubernetes.default.svc", "kubernetes.default.svc.cluster", "kubernetes.default.svc.cluster.local" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing", "O": "k8s", "OU": "System" } ] } EOF cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
- kube-proxy证书
cat << EOF | tee kube-proxy-csr.json { "CN": "system:kube-proxy", "hosts": [], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing", "O": "k8s", "OU": "System" } ] } EOF cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
4、5、6在一台机器执行即可,后续将配置文件传输到其他节点
7. 部署master节点
tar -zxvf kubernetes-server-linux-amd64.tar.gz cd kubernetes/server/bin/ cp kube-scheduler kube-apiserver kube-controller-manager kubectl /k8s/kubernetes/bin/
7.1 部署kube-apiserver组件
- 部署kube-apiserver组件 创建TLS Bootstrapping Token
[centos@jiliguo bin]$ head -c 16 /dev/urandom | od -An -t x | tr -d ' ' c3daa4aea38e73da480df317c0fd63f9 vim /k8s/kubernetes/cfg/token.csv c3daa4aea38e73da480df317c0fd63f9,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
- 创建Apiserver配置文件
vim /k8s/kubernetes/cfg/kube-apiserver KUBE_APISERVER_OPTS="--logtostderr=true \ --v=4 \ --etcd-servers=https://10.0.0.170:2379,https://10.0.0.113:2379,https://10.0.0.56:2379 \ --bind-address=10.0.0.170 \ --secure-port=6443 \ --advertise-address=10.0.0.170 \ --allow-privileged=true \ --service-cluster-ip-range=10.254.0.0/16 \ --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \ --authorization-mode=RBAC,Node \ --enable-bootstrap-token-auth \ --token-auth-file=/k8s/kubernetes/cfg/token.csv \ --service-node-port-range=30000-50000 \ --tls-cert-file=/k8s/kubernetes/ssl/server.pem \ --tls-private-key-file=/k8s/kubernetes/ssl/server-key.pem \ --client-ca-file=/k8s/kubernetes/ssl/ca.pem \ --service-account-key-file=/k8s/kubernetes/ssl/ca-key.pem \ --etcd-cafile=/k8s/etcd/ssl/ca.pem \ --etcd-certfile=/k8s/etcd/ssl/server.pem \ --etcd-keyfile=/k8s/etcd/ssl/server-key.pem"
- 创建apiserver systemd文件
vim /usr/lib/systemd/system/kube-apiserver.service [Unit] Description=Kubernetes API Server Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/k8s/kubernetes/cfg/kube-apiserver ExecStart=/k8s/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target
- 启动服务
systemctl daemon-reload systemctl enable kube-apiserver systemctl start kube-apiserver
7.2 部署kube-scheduler组件
- 创建kube-scheduler配置文件
vim /k8s/kubernetes/cfg/kube-scheduler KUBE_SCHEDULER_OPTS=" --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect "
- 创建kube-scheduler systemd文件
[Unit] Description=Kubernetes Scheduler Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/k8s/kubernetes/cfg/kube-scheduler ExecStart=/k8s/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target
- 启动服务
systemctl daemon-reload systemctl enable kube-scheduler.service systemctl start kube-scheduler.service
7.3 部署kube-controller-manager组件
- 创建kube-controller-manager配置文件
vim /k8s/kubernetes/cfg/kube-controller-manager KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \ --v=4 \ --master=127.0.0.1:8080 \ --leader-elect=true \ --address=127.0.0.1 \ --service-cluster-ip-range=10.254.0.0/16 \ --cluster-name=kubernetes \ --cluster-signing-cert-file=/k8s/kubernetes/ssl/ca.pem \ --cluster-signing-key-file=/k8s/kubernetes/ssl/ca-key.pem \ --root-ca-file=/k8s/kubernetes/ssl/ca.pem \ --service-account-private-key-file=/k8s/kubernetes/ssl/ca-key.pem"
- 创建kube-controller-manager systemd文件
vim /usr/lib/systemd/system/kube-controller-manager.service [Unit] Description=Kubernetes Controller Manager Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/k8s/kubernetes/cfg/kube-controller-manager ExecStart=/k8s/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target
- 启动服务
systemctl daemon-reload systemctl enable kube-scheduler.service systemctl start kube-scheduler.service
7.4 验证kubeserver服务
vim /etc/profile export PATH=/k8s/kubernetes/bin:$PATH source /etc/profile [centos@jiliguo ~]$ kubectl get cs,nodes NAME STATUS MESSAGE ERROR componentstatus/controller-manager Healthy ok componentstatus/scheduler Healthy ok componentstatus/etcd-2 Healthy {"health":"true"} componentstatus/etcd-0 Healthy {"health":"true"} componentstatus/etcd-1 Healthy {"health":"true"}
8. 部署node节点
8.1 部署kubelet组件
以下2步骤在master节点执行
- 将kubelet-bootstrap用户绑定到系统集群角色
kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
- 创建kubelet-bootsreap kubeconfig文件
#!/bin/bash #创建kubelet bootstrapping kubeconfig BOOTSTRAP_TOKEN=c3daa4aea38e73da480df317c0fd63f9 KUBE_APISERVER="https://10.0.0.170:6443" #设置集群参数 kubectl config set-cluster kubernetes \ --certificate-authority=/k8s/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=bootstrap.kubeconfig #设置客户端认证参数 kubectl config set-credentials kubelet-bootstrap \ --token=${BOOTSTRAP_TOKEN} \ --kubeconfig=bootstrap.kubeconfig # 设置上下文参数 kubectl config set-context default \ --cluster=kubernetes \ --user=kubelet-bootstrap \ --kubeconfig=bootstrap.kubeconfig # 设置默认上下文 kubectl config use-context default --kubeconfig=bootstrap.kubeconfig #---------------------- # 创建kube-proxy kubeconfig文件 kubectl config set-cluster kubernetes \ --certificate-authority=/k8s/kubernetes/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kube-proxy.kubeconfig # 此处需要换个路径,普通用户出现无法读取,加sudo出现没有找到命令 kubectl config set-credentials kube-proxy \ --client-certificate=/home/centos/k8s/kubernetes/ssl/kube-proxy.pem \ --client-key=/home/centos/k8s/kubernetes/ssl/kube-proxy-key.pem \ --embed-certs=true \ --kubeconfig=kube-proxy.kubeconfig kubectl config set-context default \ --cluster=kubernetes \ --user=kube-proxy \ --kubeconfig=kube-proxy.kubeconfig kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
sh /k8s/kubernetes/cfg/environment.sh
将配置文件传输到node节点目录下/k8s/kubernetes/cfg
node节点
- 安装二进制文件
tar zxvf kubernetes-node-linux-amd64.tar.gz cd kubernetes/node/bin/ cp kube-proxy kubelet kubectl /k8s/kubernetes/bin/
- 创建kubelet参数配置模板文件
vim /k8s/kubernetes/cfg/kubelet.config kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 address: 10.0.0.113 port: 10250 readOnlyPort: 10255 cgroupDriver: cgroupfs clusterDNS: ["10.254.0.10"] clusterDomain: cluster.local. failSwapOn: false authentication: anonymous: enabled: true
- 创建kubelet配置文件
vim /k8s/kubernetes/cfg/kubelet KUBELET_OPTS="--logtostderr=true \ --v=4 \ --hostname-override=10.0.0.113 \ --kubeconfig=/k8s/kubernetes/cfg/kubelet.kubeconfig \ --bootstrap-kubeconfig=/k8s/kubernetes/cfg/bootstrap.kubeconfig \ --config=/k8s/kubernetes/cfg/kubelet.config \ --cert-dir=/k8s/kubernetes/ssl \ --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"
- 创建kubelet systemd文件
vim /usr/lib/systemd/system/kubelet.service [Unit] Description=Kubernetes Kubelet After=docker.service Requires=docker.service [Service] EnvironmentFile=/k8s/kubernetes/cfg/kubelet ExecStart=/k8s/kubernetes/bin/kubelet $KUBELET_OPTS Restart=on-failure KillMode=process [Install] WantedBy=multi-user.target
- 启动服务
sudo systemctl daemon-reload sudo systemctl enable kubelet sudo systemctl start kubelet sudo systemctl status kubelet
- master节点 Master接受kubelet CSR请求 可以手动或自动 approve CSR 请求。推荐使用自动的方式,因为从 v1.8 版本开始,可以自动轮转approve csr 后生成的证书,如下是手动 approve CSR请求操作方法 查看CSR列表
[centos@jiliguo k8s]$ kubectl get csr NAME AGE REQUESTOR CONDITION node-csr-uOJ3ElpCCtzi4E1JKCGzf6zm8B8769kKX4OHRtYuPVM 67s kubelet-bootstrap Pending [centos@jiliguo k8s]$ kubectl certificate approve node-csr-uOJ3ElpCCtzi4E1JKCGzf6zm8B8769kKX4OHRtYuPVM certificatesigningrequest.certificates.k8s.io/node-csr-uOJ3ElpCCtzi4E1JKCGzf6zm8B8769kKX4OHRtYuPVM [centos@jiliguo k8s]$ kubectl get csr NAME AGE REQUESTOR CONDITION node-csr-uOJ3ElpCCtzi4E1JKCGzf6zm8B8769kKX4OHRtYuPVM 3m20s kubelet-bootstrap Approved,Issued
8.2 部署kube-proxy组件
kube-proxy 运行在所有 node节点上,它监听 apiserver 中 service 和 Endpoint的变化情况,创建路由规则来进行服务负载均衡
- 创建 kube-proxy 配置文件
vim /k8s/kubernetes/cfg/kube-proxy KUBE_PROXY_OPTS="--logtostderr=true \ --v=4 \ --hostname-override=10.0.0.113 \ --cluster-cidr=10.254.0.0/16 \ --kubeconfig=/k8s/kubernetes/cfg/kube-proxy.kubeconfig"
- 创建kube-proxy systemd文件
vim /usr/lib/systemd/system/kube-proxy.service [Unit] Description=Kubernetes Proxy After=network.target [Service] EnvironmentFile=-/k8s/kubernetes/cfg/kube-proxy ExecStart=/k8s/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS Restart=on-failure [Install] WantedBy=multi-user.target
- 启动服务
sudo systemctl daemon-reload sudo systemctl enable kube-proxy sudo systemctl start kube-proxy sudo systemctl status kube-proxy
按照上述流程操作另一node节点
9. 安装flannel网络
默认没有flanneld网络,Node节点间的pod不能通信,只能Node内通信,为了部署步骤简洁明了,故flanneld放在后面安装 flannel服务需要先于docker启动。flannel服务启动时主要做了以下几步的工作: 从etcd中获取network的配置信息 划分subnet,并在etcd中进行注册 将子网信息记录到/run/flannel/subnet.env中
以下操作在需要加入flannel网络节点间操作
9.1 etcd注册网段
/k8s/etcd/bin/etcdctl --ca-file=/k8s/etcd/ssl/ca.pem --cert-file=/k8s/etcd/ssl/server.pem --key-file=/k8s/etcd/ssl/server-key.pem --endpoints="https://10.0.0.170:2379,https://10.0.0.113:2379,https://10.0.0.56:2379" set /k8s/network/config '{ "Network": "10.254.0.0/16", "Backend": {"Type": "vxlan"}}' { "Network": "10.254.0.0/16", "Backend": {"Type": "vxlan"}}
9.2 flannel部署
- 解压安装
tar -xvf flannel-v0.10.0-linux-amd64.tar.gz mv flanneld mk-docker-opts.sh /k8s/kubernetes/bin/
- 配置flanneld
vim /k8s/kubernetes/cfg/flanneld FLANNEL_OPTIONS="--etcd-endpoints=https://10.0.0.170:2379,https://10.0.0.113:2379,https://10.0.0.56:2379 -etcd-cafile=/k8s/etcd/ssl/ca.pem -etcd-certfile=/k8s/etcd/ssl/server.pem -etcd-keyfile=/k8s/etcd/ssl/server-key.pem -etcd-prefix=/k8s/network"
- 创建flanneld systemd文件
vim /usr/lib/systemd/system/flanneld.service [Unit] Description=Flanneld overlay address etcd agent After=network-online.target network.target Before=docker.service [Service] Type=notify EnvironmentFile=/k8s/kubernetes/cfg/flanneld ExecStart=/k8s/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS ExecStartPost=/k8s/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env Restart=on-failure [Install] WantedBy=multi-user.target
- 配置Docker启动指定子网 修改EnvironmentFile=/run/flannel/subnet.env,ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS即可
vim /usr/lib/systemd/system/docker.service [Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network-online.target firewalld.service Wants=network-online.target [Service] Type=notify EnvironmentFile=/run/flannel/subnet.env ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS ExecReload=/bin/kill -s HUP $MAINPID LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity TimeoutStartSec=0 Delegate=yes KillMode=process Restart=on-failure StartLimitBurst=3 StartLimitInterval=60s [Install] WantedBy=multi-user.target
- 启动服务
注意启动flannel前要关闭docker及相关的kubelet这样flannel才会覆盖docker0网桥
sudo systemctl daemon-reload sudo systemctl stop docker sudo systemctl start flanneld sudo systemctl enable flanneld sudo systemctl start docker
master节点: sudo systemctl restart kube-apiserver.service sudo systemctl restart kube-controller-manager.service sudo systemctl restart kube-scheduler.service node 节点: sudo systemctl restart kubelet sudo systemctl restart kube-proxy
- 验证服务
[centos@jiliguo k8s1.13]$ cat /run/flannel/subnet.env DOCKER_OPT_BIP="--bip=10.254.55.1/24" DOCKER_OPT_IPMASQ="--ip-masq=false" DOCKER_OPT_MTU="--mtu=1450" DOCKER_NETWORK_OPTIONS=" --bip=10.254.55.1/24 --ip-masq=false --mtu=1450" [centos@jiliguo k8s1.13]$ ip a 5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether 02:42:d4:14:40:81 brd ff:ff:ff:ff:ff:ff inet 10.254.55.1/24 brd 10.254.55.255 scope global docker0 valid_lft forever preferred_lft forever inet6 fe80::42:d4ff:fe14:4081/64 scope link valid_lft forever preferred_lft forever
10. 集群测试
通过部署nginx服务来进行测试。
- 部署nginx deployment
kubectl create deployment nginx --image=nginxkubectl
- 创建nginx服务
kubectl create service nodeport nginx --tcp 80:80
- 查看nginx服务
[centos@jiliguo ~]$ kubectl get service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.254.0.1 <none> 443/TCP 25h nginx NodePort 10.254.219.203 <none> 80:31900/TCP 13m
- 测试服务
在node节点执行 curl 127.0.0.1:31900 或在浏览器输入node节点ip:31900
问题
- 用192.168.9段ip etcd服务无法启动,一直显示cannot assign requested address,但是换成本机ens0 10.0.0段ip后成功
参考:https://github.com/minminmsn/k8s1.13/blob/master/kubernetes/kubernetes1.13.1%2Betcd3.3.10%2Bflanneld0.10%E9%9B%86%E7%BE%A4%E9%83%A8%E7%BD%B2.md
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