二进制部署k8s
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最后更新于
本文主要介绍了如何在centos上采用二进制搭建k8s集群。
k8s-master| 192.168.21.31| kube-apiserver,kube-controller-manager,kube-scheduler,etcd k8s-node1| 192.168.21.32| kubelet,kube-proxy,docker,flannel,etcd k8s-node2| 192.168.21.33 |kubelet,kube-proxy,docker,flannel,etcd
以下操作每台机器都需要执行
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
setenforce 0
sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
systemctl stop firewalld
echo "192.168.21.31 master
192.168.21.32 node1
192.168.21.33 node2" >> /etc/hosts
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
mkdir /root/k8s/etcd
cd /root/k8s/etcd
cat <<EOF > ca-config.json
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
cat <<EOF > ca-csr.json
{
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF
cat <<EOF > server-csr.json
{
"CN": "etcd",
"hosts": [
"192.168.31.63",
"192.168.31.65",
"192.168.31.66"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF
执行命令生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
ls *pem
ca-key.pem ca.pem server-key.pem server.pem
二进制包下载地址:https://github.com/etcd-io/etcd/releases/download/v3.3.10/etcd-v3.3.10-linux-amd64.tar.gz
创建目录存放包
mkdir -p /root/k8s/software
获取包解压
# wget https://github.com/etcd-io/etcd/releases/download/v3.3.10/etcd-v3.3.10-linux-amd64.tar.gz
# tar zxvf etcd-v3.2.12-linux-amd64.tar.gz
创建etcd存放配置文件,bin文件和证书的目录,并拷贝对应的文件过去
mkdir /opt/etcd/{bin,cfg,ssl} -p
mv etcd-v3.3.10-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
创建etcd的配置文件
cat <<EOF > /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.21.31:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.21.31:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.21.31:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.21.31:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.21.31:2380,etcd02=https://192.168.21.32:2380,etcd03=https://192.168.21.33:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
设置systemd管理etcd
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=/opt/etcd/cfg/etcd
ExecStart=/opt/etcd/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=/opt/etcd/ssl/server.pem \\
--key-file=/opt/etcd/ssl/server-key.pem \\
--peer-cert-file=/opt/etcd/ssl/server.pem \\
--peer-key-file=/opt/etcd/ssl/server-key.pem \\
--trusted-ca-file=/opt/etcd/ssl/ca.pem \\
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
拷贝之前生成的etcd证书
# cp ca*pem server*pem /opt/etcd/ssl
master启动etcd
# systemctl start etcd
# systemctl enable etcd
node节点上部署etcd只需要把master的文件拷贝过来,然后修改下etcd的配置文件就行
scp -r /opt/etcd/ root@192.168.21.32:/opt
scp -r /opt/etcd/ root@192.168.21.33:/opt
scp /usr/lib/systemd/system/etcd.service root@192.168.21.32:/usr/lib/systemd/system
scp /usr/lib/systemd/system/etcd.service root@192.168.21.33:/usr/lib/systemd/system
node1和node2上修改/opt/etcd/cfg/etcd
修改后如下
node1
[root@node1 cfg]# cat /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd02"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.21.32:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.21.32:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.21.32:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.21.32:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.21.31:2380,etcd02=https://192.168.21.32:2380,etcd03=https://192.168.21.33:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
node2
[root@node2 kubernetes]# cat /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd03"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.21.33:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.21.33:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.21.33:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.21.33:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.21.31:2380,etcd02=https://192.168.21.32:2380,etcd03=https://192.168.21.33:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
然后再node1和node2上启动etcd
# systemctl start etcd
# systemctl enable etcd
验证etcd集群
# cd /opt/etcd/ssl
# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.21.31:2379,https://192.168.21.32:2379,https://192.168.21.33:2379" cluster-health
所有机器节点都执行
# sudo yum install -y yum-utils device-mapper-persistent-data lvm2
# sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# sudo yum -y install docker-ce
# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://bc437cce.m.daocloud.io
# systemctl start docker
# systemctl enable docker
部署flannel网络需要用etcd存储一个子网信息,所以要保证能成功连接etcd
master上执行命令写入
# cd /opt/etcd/ssl
# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.21.31:2379,https://192.168.21.32:2379,https://192.168.21.33:2379" set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
在node1节点上执行操作,其他节点后续拷贝文件就行
下载二进制包
cd /root/k8s/software
# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
# tar zxvf flannel-v0.9.1-linux-amd64.tar.gz
# mv flanneld mk-docker-opts.sh /opt/kubernetes/bin
配置Flannel.
# mkdir -p /opt/kubernetes/{cfg,bin,ssl}
# cat << EOF > /opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.21.31:2379,https://192.168.21.32:2379,https://192.168.21.33:2379 -etcd-cafile=/opt/etcd/ssl/ca.pem -etcd-certfile=/opt/etcd/ssl/server.pem -etcd-keyfile=/opt/etcd/ssl/server-key.pem"
EOF
systemd管理Flannel
# cat << EOF > /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
EOF
配置docker启动指定子网段
cat << EOF > /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
EOF
重启flannel和docker
# systemctl daemon-reload
# systemctl start flanneld
# systemctl enable flanneld
# systemctl restart docker
其他节点部署(master上可部署也可不部署)
# scp -r /opt/kubernetes/ root@192.168.21.33:/opt
# scp -r /opt/kubernetes/ root@192.168.21.31:/opt
# scp -r /usr/lib/systemd/system/{flanneld,docker}.service root@192.168.21.31:/usr/lib/systemd/system
# scp -r /usr/lib/systemd/system/{flanneld,docker}.service root@192.168.21.33:/usr/lib/systemd/system
其他节点重启flannel和docker
# systemctl daemon-reload
# systemctl start flanneld
# systemctl enable flanneld
# systemctl restart docker
测试
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:
# mkdir /root/k8s/master
# cd /root/k8s/master
创建ca证书
# cat << EOF > ca-config.json
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
# cat << EOF > 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 -
生成apiserver证书
下面配置文件中的ip包含lb的ip,masterip和网络ip还有本地ip
# cat << EOF > server-csr.json
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.21.31",
"192.168.21.32",
"192.168.21.33",
"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的证书
# cat << EOF > 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
最终生成证书如下
# ls *pem
ca-key.pem ca.pem kube-proxy-key.pem kube-proxy.pem server-key.pem server.pem
下载二进制包
wget https://dl.k8s.io/v1.15.12/kubernetes-server-linux-amd64.tar.gz /root/k8s/software
拷贝所需要的文件
# mkdir /opt/kubernetes/{bin,cfg,ssl} -p
# tar zxvf kubernetes-server-linux-amd64.tar.gz
# cd kubernetes/server/bin
# cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin
创建token文件
# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
# cat << EOF > /opt/kubernetes/cfg/token.csv
231f18a1d882a5037e4374e51c6ec7e0,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
第一列:随机字符串,自己执行第一条命令生成
第二列:用户名
第三列:UID
第四列:用户组
创建apiserver配置文件
# cat << EOF > /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \\
--v=4 \\
--etcd-servers=https://192.168.21.31:2379,https://192.168.21.32:2379,https://192.168.21.33:2379 \\
--bind-address=192.168.21.31 \\
--secure-port=6443 \\
--advertise-address=192.168.21.31 \\
--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
systemd管理apiserver
# 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
启动apiserver
# systemctl daemon-reload
# systemctl enable kube-apiserver
# systemctl restart kube-apiserver
创建scheduler配置文件
cat << EOF > /opt/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true \\
--v=4 \\
--master=127.0.0.1:8080 \\
--leader-elect"
EOF
systemd管理scheduler组件
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
启动scheduler
# systemctl daemon-reload
# systemctl enable kube-scheduler
# systemctl restart kube-scheduler
创建controller-manager配置文件
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
systemd管理controller-manager组件
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
启动controller-manager
# systemctl daemon-reload
# systemctl enable kube-controller-manager
# systemctl restart kube-controller-manager
检查组件状态
[root@master cfg]# /opt/kubernetes/bin/kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-1 Healthy {"health":"true"}
etcd-2 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
# kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
在生成kubernetes证书的目录下执行以下命令生成kubeconfig文件
[root@node1 cfg]# cd /opt/kubernetes/ssl/
[root@master ssl]# cat kubeconfig.sh
BOOTSTRAP_TOKEN=231f18a1d882a5037e4374e51c6ec7e0
KUBE_APISERVER="https://192.168.21.31:6443"
# 设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=./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=${BOOTSTRAP_TOKEN} \
--kubeconfig=bootstrap.kubeconfig
# 设置上下文参数
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=bootstrap.kubeconfig
# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
#----------------------
# 创建kube-proxy kubeconfig文件
kubectl config set-cluster kubernetes \
--certificate-authority=./ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=./kube-proxy.pem \
--client-key=./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
将文件拷贝到节点的配置文件目录
scp *.kubeconfig root@192.168.21.32: /opt/kubernetes/cfg
scp *.kubeconfig root@192.168.21.33: /opt/kubernetes/cfg
从master上拷贝执行文件
# cd /root/k8s/software/kubernetes/server/bin
# scp kubelet kube-proxy root2192.168.21.32: /opt/kubernetes/bin
# scp kubelet kube-proxy root2192.168.21.33: /opt/kubernetes/bin
创建kubelet配置文件(node上都要执行,注意修改ip)
cat << EOF > /opt/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=192.168.21.32 \\
--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
配置kubelet.config配置文件(node上都要执行,注意修改ip)
cat << EOF > /opt/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.21.32
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS: ["10.0.0.2"]
clusterDomain: cluster.local.
failSwapOn: false
authentication:
anonymous:
enabled: true
EOF
systemd管理kubelet组件(node上都要执行)
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
启动kubelet(node上都要执行)
# systemctl daemon-reload
# systemctl enable kubelet
# systemctl restart kubelet
master上审批node加入集群
启动后还没加入到集群中,需要手动允许该节点才可以。
在Master节点查看请求签名的Node:
# kubectl get csr
# kubectl certificate approve XXXXID
# kubectl get node
创建kube-proxy配置文件(node上都要执行,注意修改ip)
cat << EOF > /opt/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=192.168.21.32 \\
--cluster-cidr=10.0.0.0/24 \\
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"
EOF
systemd管理kube-proxy组件(node上都要执行)
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
启动kube-proxy
# systemctl daemon-reload
# systemctl enable kube-proxy
# systemctl restart kube-proxy
执行下面操作部署
# cp /root/k8s/software/kubernetes/cluster/addons/dns/coredns/ coredns.yaml.base /root/cordns.yam
# sed -i -e "s/__PILLAR__DNS__DOMAIN__/cluster.local./" -e "s/__PILLAR__DNS__SERVER__/10.0.0.2/" coredns.yaml
# sed -i -e "s/__PILLAR__DNS__MEMORY__LIMIT__/150Mi/"
# sed -i -e "s/ k8s.gcr.io\/coredns:1.3.1/"coredns\/coredns:1.3.1
# kubectl apply -f /root/ coredns.yaml
# kubectl run nginx --image=nginx --replicas=3
# kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort
[root@master coredns]# kubectl get pods
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 12 15h
nginx-7bb7cd8db5-g7pxs 1/1 Running 0 15h
nginx-7bb7cd8db5-p22cb 1/1 Running 0 15h
nginx-7bb7cd8db5-z6dwn 1/1 Running 0 15h
[root@master coredns]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 16h
nginx NodePort 10.0.0.63 <none> 88:43614/TCP 15h
访问集群中部署的Nginx,打开浏览器输入:http://192.168.31.32:43614
Master apiserver启用TLS认证后,Node节点kubelet组件想要加入集群,必须使用CA签发的有效证书才能与apiserver通信,当Node节点很多时,签署证书是一件很繁琐的事情,因此有了TLS Bootstrapping机制,kubelet会以一个低权限用户自动向apiserver申请证书,kubelet的证书由apiserver动态签署。