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1、系统概述
2、自签Etcd SSL证书
3、Etcd数据库集群部署
4、Node安装Docker
5、Flannel容器集群网络部署
6、自签APIServer SSL证书
7、部署Master组件
8、生产Node kubeconfig文件
9、部署Node组件
10、安装nginx
11、安装keepalived
12、节点发现
13、运行一个测试示例
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1、系统概述
操作系统版本:CentOS7.5
k8s版本:1.12
系统要求:关闭swap、selinux、iptables
具体信息:
拓扑图:
二进制包下载地址
etcd:
https://github.com/coreos/etcd/releases/tag/v3.2.12
flannel:
https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
k8s:
https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md
2、自签Etcd SSL证书
master01操作:
# cat cfssl.sh #!/bin/bash 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
自签Etcd SSL证书
# cat cert-etcd.sh cat > ca-config.json <<EOF { "signing": { "default": { "expiry": "87600h" }, "profiles": { "www": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } EOF cat > ca-csr.json <<EOF { "CN": "etcd CA", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing" } ] } EOF cat > server-csr.json <<EOF { "CN": "etcd", "hosts": [ "192.168.247.161", "192.168.247.162", "192.168.247.163" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing" } ] } EOF cfssl gencert -initca ca-csr.json | cfssljson -bare ca - cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
# ll *.pem -rw------- 1 root root 1675 Jan 11 15:50 ca-key.pem -rw-r--r-- 1 root root 1265 Jan 11 15:50 ca.pem -rw------- 1 root root 1679 Jan 11 15:50 server-key.pem -rw-r--r-- 1 root root 1338 Jan 11 15:50 server.pem
3、Etcd数据库集群部署
master01 02 03操作:
# mkdir -pv /opt/etcd/{bin,cfg,ssl} # tar zxvf etcd-v3.2.12-linux-amd64.tar.gz # mv etcd-v3.2.12-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
master01操作:
# cd cert-etcd/ [root@master01 cert-etcd]# ll total 40 -rw-r--r-- 1 root root 287 Jan 11 15:50 ca-config.json -rw-r--r-- 1 root root 956 Jan 11 15:50 ca.csr -rw-r--r-- 1 root root 209 Jan 11 15:50 ca-csr.json -rw------- 1 root root 1675 Jan 11 15:50 ca-key.pem -rw-r--r-- 1 root root 1265 Jan 11 15:50 ca.pem -rw-r--r-- 1 root root 1013 Jan 11 15:50 server.csr -rw-r--r-- 1 root root 296 Jan 11 15:50 server-csr.json -rw------- 1 root root 1679 Jan 11 15:50 server-key.pem -rw-r--r-- 1 root root 1338 Jan 11 15:50 server.pem -rwxr-xr-x 1 root root 1076 Jan 11 15:50 ssl-etcd.sh [root@master01 cert-etcd]# cp *.pem /opt/etcd/ssl/
# scp -r /opt/etcd master02:/opt/ # scp -r /opt/etcd master03:/opt/
分别在master01 02 03操作:
# cat etcd.sh #!/bin/bash # example: ./etcd.sh etcd01 192.168.1.10 etcd02=https://192.168.1.11:2380,etcd03=https://192.168.1.12:2380 ETCD_NAME=$1 ETCD_IP=$2 ETCD_CLUSTER=$3 WORK_DIR=/opt/etcd cat <<EOF >$WORK_DIR/cfg/etcd #[Member] ETCD_NAME="${ETCD_NAME}" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380" ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379" #[Clustering] ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380" ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379" ETCD_INITIAL_CLUSTER="${ETCD_NAME}=https://${ETCD_IP}:2380,${ETCD_CLUSTER}" ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" ETCD_INITIAL_CLUSTER_STATE="new" EOF cat <<EOF >/usr/lib/systemd/system/etcd.service [Unit] Description=Etcd Server After=network.target After=network-online.target Wants=network-online.target [Service] Type=notify EnvironmentFile=${WORK_DIR}/cfg/etcd ExecStart=${WORK_DIR}/bin/etcd \ --name=\${ETCD_NAME} \ --data-dir=\${ETCD_DATA_DIR} \ --listen-peer-urls=\${ETCD_LISTEN_PEER_URLS} \ --listen-client-urls=\${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \ --advertise-client-urls=\${ETCD_ADVERTISE_CLIENT_URLS} \ --initial-advertise-peer-urls=\${ETCD_INITIAL_ADVERTISE_PEER_URLS} \ --initial-cluster=\${ETCD_INITIAL_CLUSTER} \ --initial-cluster-token=\${ETCD_INITIAL_CLUSTER_TOKEN} \ --initial-cluster-state=new \ --cert-file=${WORK_DIR}/ssl/server.pem \ --key-file=${WORK_DIR}/ssl/server-key.pem \ --peer-cert-file=${WORK_DIR}/ssl/server.pem \ --peer-key-file=${WORK_DIR}/ssl/server-key.pem \ --trusted-ca-file=${WORK_DIR}/ssl/ca.pem \ --peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl start etcd systemctl enable etcd
# ./etcd.sh etcd01 192.168.247.161 etcd02=https://192.168.247.162:2380,etcd03=https://192.168.247.163:2380
# scp etcd.sh master02:/root/ # scp etcd.sh master03:/root/
[root@master02 ~]# ./etcd.sh etcd02 192.168.247.162 etcd01=https://192.168.247.161:2380,etcd03=https://192.168.247.163:2380 [root@master03 ~]# ./etcd.sh etcd03 192.168.247.163 etcd01=https://192.168.247.161:2380,etcd02=https://192.168.247.162:2380
[root@master01 ~]# systemctl restart etcd # cd /opt/etcd/ssl # /opt/etcd/bin/etcdctl \ --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \ --endpoints="https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379" \ cluster-health member 1afd7ff8f95cf93 is healthy: got healthy result from https://192.168.247.161:2379 member 8f4e6ce663f0d49a is healthy: got healthy result from https://192.168.247.162:2379 member b6230d9c6f20feeb is healthy: got healthy result from https://192.168.247.163:2379 cluster is healthy
如有报错,查看/var/log/message日志
4、node节点安装docker
可以放到脚本内执行
# cat docker.sh yum remove -y docker docker-common docker-selinux docker-engine yum install -y yum-utils device-mapper-persistent-data lvm2 wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo sed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo yum makecache fast yum install -y docker-ce systemctl enable docker systemctl start docker docker version
如果拉取镜像较慢,可以配置daocloud提供的docker加速器
5、Flannel网络部署
master01执行:
# pwd /opt/etcd/ssl # /opt/etcd/bin/etcdctl \ --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \ --endpoints="https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379" \ set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
node01执行:
# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz # tar zxvf flannel-v0.10.0-linux-amd64.tar.gz # mkdir -pv /opt/kubernetes/{bin,cfg,ssl} # mv flanneld mk-docker-opts.sh /opt/kubernetes/bin/
# cat /opt/kubernetes/cfg/flanneld FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379 -etcd-cafile=/opt/etcd/ssl/ca.pem -etcd-certfile=/opt/etcd/ssl/server.pem -etcd-keyfile=/opt/etcd/ssl/server-key.pem"
将master节点的/opt/etcd/ssl/*拷贝到node节点
[root@master01 ~]# scp -r /opt/etcd/ssl node01:/opt/etcd/
# cat /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=/opt/kubernetes/cfg/flanneld ExecStart=/opt/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env Restart=on-failure [Install] WantedBy=multi-user.target
# cat /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
重启flannel和docker:
# systemctl daemon-reload # systemctl start flanneld # systemctl enable flanneld # systemctl restart docker # systemctl enable docker
# cat /run/flannel/subnet.env DOCKER_OPT_BIP="--bip=172.17.12.1/24" DOCKER_OPT_IPMASQ="--ip-masq=false" DOCKER_OPT_MTU="--mtu=1450" DOCKER_NETWORK_OPTIONS=" --bip=172.17.12.1/24 --ip-masq=false --mtu=1450"
# ip a 5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether 02:42:f0:62:07:73 brd ff:ff:ff:ff:ff:ff inet 172.17.12.1/24 brd 172.17.12.255 scope global docker0 valid_lft forever preferred_lft forever 6: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default link/ether ca:e9:e0:d4:05:be brd ff:ff:ff:ff:ff:ff inet 172.17.12.0/32 scope global flannel.1 valid_lft forever preferred_lft forever inet6 fe80::c8e9:e0ff:fed4:5be/64 scope link valid_lft forever preferred_lft forever
将介质及配置文件拷贝至node02节点
# scp -r /opt/kubernetes node02:/opt/ # cd /usr/lib/systemd/system/ # scp flanneld.service docker.service node02:/usr/lib/systemd/system/ # scp -r /opt/etcd/ssl/ node02:/opt/etcd/
node02执行:
# mkdir /opt/etcd
# systemctl daemon-reload # systemctl start flanneld # systemctl enable flanneld # systemctl restart docker
# ip a 5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether 02:42:ca:2c:48:df brd ff:ff:ff:ff:ff:ff inet 172.17.16.1/24 brd 172.17.16.255 scope global docker0 valid_lft forever preferred_lft forever 6: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default link/ether ee:73:b2:e8:46:c1 brd ff:ff:ff:ff:ff:ff inet 172.17.16.0/32 scope global flannel.1 valid_lft forever preferred_lft forever inet6 fe80::ec73:b2ff:fee8:46c1/64 scope link valid_lft forever preferred_lft forever
网络测试:
[root@node02 opt]# ping 172.17.12.1 PING 172.17.12.1 (172.17.12.1) 56(84) bytes of data. 64 bytes from 172.17.12.1: icmp_seq=1 ttl=64 time=1.07 ms 64 bytes from 172.17.12.1: icmp_seq=2 ttl=64 time=0.300 ms
[root@node01 system]# ping 172.17.16.1 PING 172.17.16.1 (172.17.16.1) 56(84) bytes of data. 64 bytes from 172.17.16.1: icmp_seq=1 ttl=64 time=1.13 ms
6、自签APIServer SSL证书
在master01执行:
# cat cert-k8s.sh #创建ca证书 cat > ca-config.json <<EOF { "signing": { "default": { "expiry": "87600h" }, "profiles": { "kubernetes": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } EOF cat > ca-csr.json <<EOF { "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 - #生成apiserver证书: #注意IP地址,包括master和LB地址 cat > server-csr.json <<EOF { "CN": "kubernetes", "hosts": [ "10.0.0.1", "127.0.0.1", "192.168.247.160", "192.168.247.161", "192.168.247.162", "192.168.247.163", "192.168.247.164", "192.168.247.165", "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 #生成kube-proxy证书: cat > kube-proxy-csr.json <<EOF { "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 cat > admin-csr.json <<EOF { "CN": "admin", "hosts": [], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "system:masters", "OU": "System" } ] } EOF cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
# ll *.pem -rw------- 1 root root 1679 Jan 11 22:06 admin-key.pem -rw-r--r-- 1 root root 1399 Jan 11 22:06 admin.pem -rw------- 1 root root 1679 Jan 11 22:06 ca-key.pem -rw-r--r-- 1 root root 1359 Jan 11 22:06 ca.pem -rw------- 1 root root 1675 Jan 11 22:06 kube-proxy-key.pem -rw-r--r-- 1 root root 1403 Jan 11 22:06 kube-proxy.pem -rw------- 1 root root 1679 Jan 11 22:06 server-key.pem -rw-r--r-- 1 root root 1651 Jan 11 22:06 server.pem
7、部署Master组件
master01、02、03执行:
# mkdir -pv /opt/kubernetes/{bin,cfg,ssl} # tar zxvf kubernetes-server-linux-amd64.tar.gz # cd kubernetes/server/bin # cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin/ # pwd /root/cert-k8s # cp *.pem /opt/kubernetes/ssl/ # head -c 16 /dev/urandom |od -An -t x |tr -d ' ' 1c96cf8a12d4555a52e89bf3925a5c87 # cat /opt/kubernetes/cfg/token.csv 1c96cf8a12d4555a52e89bf3925a5c87,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
1)、api-server:
# cat api-server.sh #!/bin/bash # example: ./api-server.sh 192.168.247.161 https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379 MASTER_IP=$1 ETCD_SERVERS=$2 cat <<EOF > /opt/kubernetes/cfg/kube-apiserver KUBE_APISERVER_OPTS="--logtostderr=true \\ --v=4 \\ --etcd-servers=${ETCD_SERVERS} \\ --bind-address=${MASTER_IP} \\ --secure-port=6443 \\ --advertise-address=${MASTER_IP} \\ --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" EOF cat <<EOF >/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 EOF systemctl daemon-reload systemctl enable kube-apiserver systemctl restart kube-apiserver
# ./api-server.sh 192.168.247.161 https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379
2)、scheduler组件
# cat scheduler.sh cat <<EOF >/opt/kubernetes/cfg/kube-scheduler KUBE_SCHEDULER_OPTS="--logtostderr=true \\ --v=4 \\ --master=127.0.0.1:8080 \\ --leader-elect" EOF cat <<EOF >/usr/lib/systemd/system/kube-scheduler.service [Unit] Description=Kubernetes Scheduler Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl enable kube-scheduler systemctl restart kube-scheduler # ./scheduler.sh 部署controller-manager组件 # cat controller-manager.sh cat <<EOF >/opt/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=10.0.0.0/24 \\ --cluster-name=kubernetes \\ --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\ --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \\ --root-ca-file=/opt/kubernetes/ssl/ca.pem \\ --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem" EOF cat <<EOF >/usr/lib/systemd/system/kube-controller-manager.service [Unit] Description=Kubernetes Controller Manager Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl enable kube-controller-manager systemctl restart kube-controller-manager
# sh controller-manager.sh
添加环境变量
K8S_HOME=/opt/kubernetes PATH=$K8S_HOME/bin:$PATH
[root@master01 ~]# kubectl get cs # kubectl get cs NAME STATUS MESSAGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-1 Healthy {"health": "true"} etcd-2 Healthy {"health": "true"} etcd-0 Healthy {"health": "true"} [root@master02 ~]# kubectl get cs NAME STATUS MESSAGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-2 Healthy {"health": "true"} etcd-0 Healthy {"health": "true"} etcd-1 Healthy {"health": "true"} [root@master03 ~]# kubectl get cs NAME STATUS MESSAGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-1 Healthy {"health": "true"} etcd-0 Healthy {"health": "true"} etcd-2 Healthy {"health": "true"}
8、生成Node kubeconfig文件
[root@master01 ~]# scp kubernetes/server/bin/{kubelet,kube-proxy} node01:/opt/kubernetes/bin/ [root@master01 ~]# scp kubernetes/server/bin/{kubelet,kube-proxy} node02:/opt/kubernetes/bin/
master01执行: kubectl create clusterrolebinding kubelet-bootstrap \ --clusterrole=system:node-bootstrapper \ --user=kubelet-bootstrap
在master01执行:
cat kubeconfig.sh # 创建kubelet bootstrapping kubeconfig APISERVER=$1 SSL_DIR=$2 export BOOTSTRAP_TOKEN=`cat /opt/kubernetes/cfg/token.csv |awk -F',' '{print $1}'` export KUBE_APISERVER="https://$APISERVER:6443" # 设置集群参数 kubectl config set-cluster kubernetes \ --certificate-authority=$SSL_DIR/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=bootstrap.kubeconfig # 设置客户端认证参数 kubectl config set-credentials kubelet-bootstrap \ --token=${BOOTSTRAP_TOKEN} \ --kubeconfig=bootstrap.kubeconfig # 设置上下文参数 kubectl config set-context default \ --cluster=kubernetes \ --user=kubelet-bootstrap \ --kubeconfig=bootstrap.kubeconfig # 设置默认上下文 kubectl config use-context default --kubeconfig=bootstrap.kubeconfig #---------------------- # 创建kube-proxy kubeconfig文件 kubectl config set-cluster kubernetes \ --certificate-authority=$SSL_DIR/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kube-proxy.kubeconfig kubectl config set-credentials kube-proxy \ --client-certificate=$SSL_DIR/kube-proxy.pem \ --client-key=$SSL_DIR/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
# ./kubeconfig.sh 192.168.247.160 /opt/kubernetes/ssl
# ll total 16 -rw------- 1 root root 2169 Jan 12 08:09 bootstrap.kubeconfig -rwxr-xr-x 1 root root 1419 Jan 12 08:07 kubeconfig.sh -rw------- 1 root root 6271 Jan 12 08:09 kube-proxy.kubeconfig
# scp bootstrap.kubeconfig kube-proxy.kubeconfig node01:/opt/kubernetes/cfg/ # scp bootstrap.kubeconfig kube-proxy.kubeconfig node02:/opt/kubernetes/cfg/
9、部署Node组件
在node01、02执行:
1)、部署kubelet组件
cat kubelet.sh #!/bin/bash NODE_IP=$1 cat <<EOF >/opt/kubernetes/cfg/kubelet KUBELET_OPTS="--logtostderr=true \\ --v=4 \\ --address=${NODE_IP} \\ --hostname-override=${NODE_IP} \\ --kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\ --bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\ --config=/opt/kubernetes/cfg/kubelet.config \\ --cert-dir=/opt/kubernetes/ssl \\ --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0" EOF cat <<EOF >/opt/kubernetes/cfg/kubelet.config kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 address: ${NODE_IP} port: 10250 readOnlyPort: 10255 cgroupDriver: cgroupfs clusterDNS: ["10.0.0.2"] clusterDomain: cluster.local. failSwapOn: false authentication: anonymous: enabled: true EOF cat <<EOF >/usr/lib/systemd/system/kubelet.service [Unit] Description=Kubernetes Kubelet After=docker.service Requires=docker.service [Service] EnvironmentFile=/opt/kubernetes/cfg/kubelet ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS Restart=on-failure KillMode=process [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl enable kubelet systemctl restart kubelet
# ./kubelet.sh 192.168.247.171
# ./kubelet.sh 192.168.247.172
2)、部署kube-proxy组件:
cat kube-proxy.sh #!/bin/bash NODE_IP=$1 cat <<EOF >/opt/kubernetes/cfg/kube-proxy KUBE_PROXY_OPTS="--logtostderr=true \\ --v=4 \\ --hostname-override=${NODE_IP} \\ --cluster-cidr=10.0.0.0/24 \\ --proxy-mode=ipvs \\ --kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig" EOF cat <<EOF >/usr/lib/systemd/system/kube-proxy.service [Unit] Description=Kubernetes Proxy After=network.target [Service] EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS Restart=on-failure [Install] WantedBy=multi-user.target EOF systemctl daemon-reload systemctl enable kube-proxy systemctl restart kube-proxy
# ./kube-proxy.sh 192.168.247.171
# ./kube-proxy.sh 192.168.247.172
10、安装nginx
使用nginx四层进行转发
# cat nginx.repo [nginx] name=nginx repo baseurl=http://nginx.org/packages/centos/7/$basearch/ gpgcheck=0 enabled=1
# yum install nginx
1) LB01和LB02配置:
nginx配置文件添加以下内容:
# cat /etc/nginx/nginx.conf stream{ log_format main "$remote_addr $upstream_addr $time_local $status"; access_log /var/log/nginx/k8s-access.log main; upstream k8s-apiserver { server 192.168.247.161:6443; server 192.168.247.162:6443; server 192.168.247.163:6443; } server { listen 0.0.0.0:6443; proxy_pass k8s-apiserver; } }
11、安装keepalived
# yum install keepalived # yum install libnl3-devel ipset-devel
# cat /etc/keepalived/check_nginx.sh #!/bin/bash count=$(ps -ef |grep nginx |egrep -cv "grep|$$") if [ "$count" -eq 0 ];then systemctl stop keeplived fi
# chmod 755 check_nginx.sh
LB01配置:
# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_strict vrrp_garp_interval 0 vrrp_gna_interval 0 } vrrp_script check_nginx { script "/etc/keepalived/check_nginx.sh" } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.247.160/24 } track_script { check_nginx } }
LB02配置:
# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_strict vrrp_garp_interval 0 vrrp_gna_interval 0 } vrrp_script check_nginx { script "/etc/keepalived/check_nginx.sh" } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.247.160/24 } track_script { check_nginx } }
# systemctl enable nginx # systemctl start nginx # systemctl enable keepalived # systemctl start keepalived
12、节点发现
# kubectl get csr NAME AGE REQUESTOR CONDITION node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8 17m kubelet-bootstrap Pending node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE 20m kubelet-bootstrap Pending # kubectl certificate approve node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8 certificatesigningrequest.certificates.k8s.io/node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8 approved # kubectl certificate approve node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE certificatesigningrequest.certificates.k8s.io/node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE approved # kubectl get node NAME STATUS ROLES AGE VERSION 192.168.247.171 Ready <none> 12s v1.12.4 192.168.247.172 Ready <none> 9m41s v1.12.4
13、运行一个测试示例
# kubectl run nginx --image=nginx --replicas=3 # kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE nginx-dbddb74b8-dkhcw 1/1 Running 0 38m 172.17.35.2 192.168.247.172 <none> nginx-dbddb74b8-rdf2v 1/1 Running 0 38m 172.17.17.2 192.168.247.171 <none> nginx-dbddb74b8-rn9l6 1/1 Running 0 38m 172.17.35.3 192.168.247.172 <none> # kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort service/nginx exposed # kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 12h nginx NodePort 10.0.0.30 <none> 88:48363/TCP 6s
浏览器访问:
http://192.168.247.171:48363
http://192.168.247.172:48363