确保docker0与flannel.1在同一网段。
测试不同节点互通,在当前节点访问另一个Node节点docker0 IP:
如果能通说明Flannel部署成功。如果不通检查下日志:journalctl -u flannel
4. 在Master节点部署组件在部署Kubernetes之前一定要确保etcd、flannel、docker是正常工作的,否则先解决问题再继续。
4.1 生成证书创建CA证书:
# cat ca-config.json { "signing": { "default": { "expiry": "87600h" }, "profiles": { "kubernetes": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } # cat ca-csr.json { "CN": "kubernetes", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing", "O": "k8s", "OU": "System" } ] } # cfssl gencert -initca ca-csr.json | cfssljson -bare ca -生成apiserver证书:
# cat server-csr.json { "CN": "kubernetes", "hosts": [ "10.0.0.1", "127.0.0.1", "192.168.31.63", "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" } ] } cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server生成kube-proxy证书:
# cat 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" } ] } # cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy最终生成以下证书文件:
# ls *pem ca-key.pem ca.pem kube-proxy-key.pem kube-proxy.pem server-key.pem server.pem 4.2 部署apiserver组件下载二进制包:https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md
下载这个包(kubernetes-server-linux-amd64.tar.gz)就够了,包含了所需的所有组件。
创建token文件,用途后面会讲到:
# cat /opt/kubernetes/cfg/token.csv 674c457d4dcf2eefe4920d7dbb6b0ddc,kubelet-bootstrap,10001,"system:kubelet-bootstrap"第一列:随机字符串,自己可生成
第二列:用户名
第三列:UID
第四列:用户组
创建apiserver配置文件:
# cat /opt/kubernetes/cfg/kube-apiserver KUBE_APISERVER_OPTS="--logtostderr=true \ --v=4 \ --etcd-servers=https://192.168.31.63:2379,https://192.168.31.65:2379,https://192.168.31.66:2379 \ --bind-address=192.168.31.63 \ --secure-port=6443 \ --advertise-address=192.168.31.63 \ --allow-privileged=true \ --service-cluster-ip-range=10.0.0.0/24 \ --enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction \ --authorization-mode=RBAC,Node \ --enable-bootstrap-token-auth \ --token-auth-file=/opt/kubernetes/cfg/token.csv \ --service-node-port-range=30000-50000 \ --tls-cert-file=/opt/kubernetes/ssl/server.pem \ --tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \ --client-ca-file=/opt/kubernetes/ssl/ca.pem \ --service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \ --etcd-cafile=/opt/etcd/ssl/ca.pem \ --etcd-certfile=/opt/etcd/ssl/server.pem \ --etcd-keyfile=/opt/etcd/ssl/server-key.pem"配置好前面生成的证书,确保能连接etcd。
参数说明:
--logtostderr 启用日志
---v 日志等级
--etcd-servers etcd集群地址
--bind-address 监听地址
--secure-port https安全端口
--advertise-address 集群通告地址
--allow-privileged 启用授权
--service-cluster-ip-range Service虚拟IP地址段
--enable-admission-plugins 准入控制模块
--authorization-mode 认证授权,启用RBAC授权和节点自管理
--enable-bootstrap-token-auth 启用TLS bootstrap功能,后面会讲到
--token-auth-file token文件
--service-node-port-range Service Node类型默认分配端口范围
systemd管理apiserver:
# cat /usr/lib/systemd/system/kube-apiserver.service [Unit] Description=Kubernetes API Server Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target启动:
# systemctl daemon-reload # systemctl enable kube-apiserver # systemctl restart kube-apiserver 4.3 部署scheduler组件创建schduler配置文件:
# cat /opt/kubernetes/cfg/kube-scheduler KUBE_SCHEDULER_OPTS="--logtostderr=true \ --v=4 \ --master=127.0.0.1:8080 \ --leader-elect"参数说明:
--master 连接本地apiserver
--leader-elect 当该组件启动多个时,自动选举(HA)