開始改造我們之前搭建的基礎(chǔ)集群,加上安全機(jī)制焰宣。
準(zhǔn)備工作
1. 停止master節(jié)點(diǎn)的所有服務(wù)
查看已有的service
kubectl get services
刪除service(例如有一個(gè)叫xxx的service)
kubectl delete service xxx
查看已有的deployments
kubectl get deploy
刪除deployments
kubectl delete deploy xxx
停止master的服務(wù)
service kube-calico stop
service kube-scheduler stop
service kube-controller-manager stop
service kube-apiserver stop
service etcd stop && rm -fr /var/lib/etcd/*
2. 停止worker節(jié)點(diǎn)的所有服務(wù)
service kubelet stop
rm -fr /var/lib/kubelet/*
service kube-proxy stop
rm -fr /var/lib/kube-proxy/*
service kube-calico stop
3. 安裝需要的工具
在所有節(jié)點(diǎn)上安裝cfssl:
CFSSL是CloudFlare開源的一款PKI/TLS工具盈罐。 CFSSL 包含一個(gè)命令行工具 和一個(gè)用于 簽名,驗(yàn)證并且捆綁TLS證書的 HTTP API 服務(wù)钓葫。 用Go寫的湾揽。具體相關(guān)信息自行g(shù)oogle库物。
下載
wget -q --show-progress --https-only --timestamping \
https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 \
https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
修改權(quán)限
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64
放到可執(zhí)行目錄
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
在worker節(jié)點(diǎn)上安裝conntrack
apt install conntrack
4.在master上生成根證書
mkdir -p /etc/kubernetes/ca
cd /etc/kubernetes/ca
編輯ca-config.json文件戚揭,內(nèi)容如下:
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "87600h"
}
}
}
}
編輯ca-csr.json文件民晒,內(nèi)容如下:
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "XS",
"O": "k8s",
"OU": "System"
}
]
}
執(zhí)行生成證書的命令:
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
OK锄禽。
master節(jié)點(diǎn)設(shè)置
1. etcd設(shè)置
設(shè)置etcd的證書:
mkdir -p /etc/kubernetes/ca/etcd
cd /etc/kubernetes/ca/etcd
編輯etcd-csr.json文件沃但,內(nèi)容如下:
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.32.131"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "XS",
"O": "k8s",
"OU": "System"
}
]
}
執(zhí)行簽發(fā)證書的命令:
cfssl gencert \
-ca=/etc/kubernetes/ca/ca.pem \
-ca-key=/etc/kubernetes/ca/ca-key.pem \
-config=/etc/kubernetes/ca/ca-config.json \
-profile=kubernetes etcd-csr.json | cfssljson -bare etcd
編輯/lib/systemd/system/etcd.service宵晚,內(nèi)容如下:
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/home/anakin/bin/etcd \
--name=192.168.32.131 \
--listen-client-urls=https://192.168.32.131:2379,http://127.0.0.1:2379 \
--advertise-client-urls=https://192.168.32.131:2379 \
--data-dir=/var/lib/etcd \
--listen-peer-urls=https://192.168.32.131:2380 \
--initial-advertise-peer-urls=https://192.168.32.131:2380 \
--cert-file=/etc/kubernetes/ca/etcd/etcd.pem \
--key-file=/etc/kubernetes/ca/etcd/etcd-key.pem \
--peer-cert-file=/etc/kubernetes/ca/etcd/etcd.pem \
--peer-key-file=/etc/kubernetes/ca/etcd/etcd-key.pem \
--trusted-ca-file=/etc/kubernetes/ca/ca.pem \
--peer-trusted-ca-file=/etc/kubernetes/ca/ca.pem
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
然后啟動(dòng)服務(wù):
systemctl daemon-reload
service etcd start
2. apiserver設(shè)置
創(chuàng)建一個(gè)存放證書的目錄:
mkdir -p /etc/kubernetes/ca/kubernetes
cd /etc/kubernetes/ca/kubernetes/
編輯kubernetes-csr.json文件淤刃,內(nèi)容如下:
{
"CN": "kubernetes",
"hosts": [
"127.0.0.1",
"192.168.32.131",
"10.68.0.1",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "XS",
"O": "k8s",
"OU": "System"
}
]
}
簽發(fā)證書:
cfssl gencert \
-ca=/etc/kubernetes/ca/ca.pem \
-ca-key=/etc/kubernetes/ca/ca-key.pem \
-config=/etc/kubernetes/ca/ca-config.json \
-profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes
生成一個(gè)token文件:
head -c 16 /dev/urandom | od -An -t x | tr -d ' '
c81fb8ce5502f19d510d159ff8a1cf12
把這個(gè)token存入文件:
echo "c81fb8ce5502f19d510d159ff8a1cf12,kubelet-bootstrap,10001,\"system:kubelet-bootstrap\"" > /etc/kubernetes/ca/kubernetes/token.csv
編輯/lib/systemd/system/kube-apiserver.service逸贾,內(nèi)容如下:
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
ExecStart=/home/anakin/bin/kube-apiserver \
--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota,NodeRestriction \
--insecure-bind-address=127.0.0.1 \
--kubelet-https=true \
--bind-address=192.168.32.131 \
--authorization-mode=Node,RBAC \
--runtime-config=rbac.authorization.k8s.io/v1 \
--enable-bootstrap-token-auth \
--token-auth-file=/etc/kubernetes/ca/kubernetes/token.csv \
--tls-cert-file=/etc/kubernetes/ca/kubernetes/kubernetes.pem \
--tls-private-key-file=/etc/kubernetes/ca/kubernetes/kubernetes-key.pem \
--client-ca-file=/etc/kubernetes/ca/ca.pem \
--service-account-key-file=/etc/kubernetes/ca/ca-key.pem \
--etcd-cafile=/etc/kubernetes/ca/ca.pem \
--etcd-certfile=/etc/kubernetes/ca/kubernetes/kubernetes.pem \
--etcd-keyfile=/etc/kubernetes/ca/kubernetes/kubernetes-key.pem \
--service-cluster-ip-range=10.68.0.0/16 \
--service-node-port-range=20000-40000 \
--etcd-servers=https://192.168.32.131:2379 \
--enable-swagger-ui=true \
--allow-privileged=true \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/var/lib/audit.log \
--event-ttl=1h \
--v=2
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
然后啟動(dòng)服務(wù):
systemctl daemon-reload
service kube-apiserver start
3. controller-manager設(shè)置
編輯/lib/systemd/system/kube-controller-manager.service文件灼伤,內(nèi)容如下:
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
[Service]
ExecStart=/home/anakin/bin/kube-controller-manager \
--address=127.0.0.1 \
--master=http://127.0.0.1:8080 \
--allocate-node-cidrs=true \
--service-cluster-ip-range=10.68.0.0/16 \
--cluster-cidr=172.20.0.0/16 \
--cluster-name=kubernetes \
--leader-elect=true \
--cluster-signing-cert-file=/etc/kubernetes/ca/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ca/ca-key.pem \
--service-account-private-key-file=/etc/kubernetes/ca/ca-key.pem \
--root-ca-file=/etc/kubernetes/ca/ca.pem \
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
啟動(dòng)服務(wù)
systemctl daemon-reload
service kube-controller-manager start
4. scheduler設(shè)置
scheduler不需要重新設(shè)置饺蔑,直接啟動(dòng)就ok了嗜诀。
5. kubectl設(shè)置
先創(chuàng)建一個(gè)叫做admin的系統(tǒng)管理員:
mkdir -p /etc/kubernetes/ca/admin
cd /etc/kubernetes/ca/admin/
編輯admin-csr.json文件,內(nèi)容如下:
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "XS",
"O": "system:masters",
"OU": "System"
}
]
}
簽發(fā)證書:
cfssl gencert \
-ca=/etc/kubernetes/ca/ca.pem \
-ca-key=/etc/kubernetes/ca/ca-key.pem \
-config=/etc/kubernetes/ca/ca-config.json \
-profile=kubernetes admin-csr.json | cfssljson -bare admin
然后開始設(shè)置kubectl
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/ca/ca.pem \
--embed-certs=true \
--server=https://192.168.32.131:6443
kubectl config set-credentials admin \
--client-certificate=/etc/kubernetes/ca/admin/admin.pem \
--embed-certs=true \
--client-key=/etc/kubernetes/ca/admin/admin-key.pem
kubectl config set-context kubernetes \
--cluster=kubernetes --user=admin
kubectl config use-context kubernetes
6. calico設(shè)置
生成證書:
mkdir -p /etc/kubernetes/ca/calico
cd /etc/kubernetes/ca/calico/
編輯calico-csr.json文件崔慧,內(nèi)容如下:
{
"CN": "calico",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "XS",
"O": "k8s",
"OU": "System"
}
]
}
簽發(fā)證書:
cfssl gencert \
-ca=/etc/kubernetes/ca/ca.pem \
-ca-key=/etc/kubernetes/ca/ca-key.pem \
-config=/etc/kubernetes/ca/ca-config.json \
-profile=kubernetes calico-csr.json | cfssljson -bare calico
編輯/lib/systemd/system/kube-calico.service文件惶室,內(nèi)容如下:
[Unit]
Description=calico node
After=docker.service
Requires=docker.service
[Service]
User=root
PermissionsStartOnly=true
ExecStart=/usr/bin/docker run --net=host --privileged --name=calico-node \
-e NODENAME="calico1" \
-e ETCD_ENDPOINTS=https://192.168.32.131:2379 \
-e ETCD_CA_CERT_FILE=/etc/kubernetes/ca/ca.pem \
-e ETCD_CERT_FILE=/etc/kubernetes/ca/calico/calico.pem \
-e ETCD_KEY_FILE=/etc/kubernetes/ca/calico/calico-key.pem \
-e CALICO_LIBNETWORK_ENABLED=true \
-e CALICO_NETWORKING_BACKEND=bird \
-e CALICO_DISABLE_FILE_LOGGING=true \
-e CALICO_IPV4POOL_CIDR=172.20.0.0/16 \
-e CALICO_IPV4POOL_IPIP=off \
-e FELIX_DEFAULTENDPOINTTOHOSTACTION=ACCEPT \
-e FELIX_IPV6SUPPORT=false \
-e FELIX_LOGSEVERITYSCREEN=info \
-e FELIX_IPINIPMTU=1440 \
-e FELIX_HEALTHENABLED=true \
-e IP=192.168.32.131 \
-v /etc/kubernetes/ca:/etc/kubernetes/ca \
-v /var/run/calico:/var/run/calico \
-v /lib/modules:/lib/modules \
-v /run/docker/plugins:/run/docker/plugins \
-v /var/run/docker.sock:/var/run/docker.sock \
-v /var/log/calico:/var/log/calico \
calico/node:release-v2.6
ExecStop=/usr/bin/docker rm -f calico-node
Restart=always
RestartSec=10
[Install]
WantedBy=multi-user.target
啟動(dòng)服務(wù):
systemctl daemon-reload
service kube-calico start
還有一步皇钞,就是把/etc/kubernetes/ca/calico目錄下的這幾個(gè)證書拷貝到worker節(jié)點(diǎn)對(duì)應(yīng)的位置上去備用
7. 設(shè)置kubelet的角色綁定
kubectl -n kube-system get clusterrole
kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
worker節(jié)點(diǎn)設(shè)置
1. calico設(shè)置
編輯/lib/systemd/system/kube-calico.service文件夹界,參考master節(jié)點(diǎn)的內(nèi)容可柿,只需要修改一下NODENAME就可以了丙者,然后啟動(dòng)服務(wù)
2. kubelet設(shè)置
設(shè)置kubelet參數(shù):
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/ca/ca.pem \
--embed-certs=true \
--server=https://192.168.32.131:6443 \
--kubeconfig=bootstrap.kubeconfig
kubectl config set-credentials kubelet-bootstrap \
--token=c81fb8ce5502f19d510d159ff8a1cf12\
--kubeconfig=bootstrap.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=bootstrap.kubeconfig
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
mv bootstrap.kubeconfig /etc/kubernetes/
設(shè)置cni:
cd /etc/cni/net.d/
編輯10-calico.conf文件械媒,內(nèi)容如下:
{
"name": "calico-k8s-network",
"cniVersion": "0.1.0",
"type": "calico",
"etcd_endpoints": "https://192.168.32.131:2379",
"etcd_key_file": "/etc/kubernetes/ca/calico/calico-key.pem",
"etcd_cert_file": "/etc/kubernetes/ca/calico/calico.pem",
"etcd_ca_cert_file": "/etc/kubernetes/ca/ca.pem",
"log_level": "info",
"ipam": {
"type": "calico-ipam"
},
"kubernetes": {
"kubeconfig": "/etc/kubernetes/kubelet.kubeconfig"
}
}
編輯/lib/systemd/system/kubelet.service文件滥沫,內(nèi)容如下:
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service
[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/home/anakin/bin/kubelet \
--address=192.168.32.132 \
--hostname-override=192.168.32.132 \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/imooc/pause-amd64:3.0 \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
--experimental-bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig \
--cert-dir=/etc/kubernetes/ca \
--hairpin-mode hairpin-veth \
--network-plugin=cni \
--cni-conf-dir=/etc/cni/net.d \
--cni-bin-dir=/home/anakin/bin \
--cluster-dns=10.68.0.2 \
--cluster-domain=cluster.local. \
--allow-privileged=true \
--fail-swap-on=false \
--logtostderr=true \
--v=2
#kubelet cAdvisor 默認(rèn)在所有接口監(jiān)聽 4194 端口的請(qǐng)求, 以下iptables限制內(nèi)網(wǎng)訪問
ExecStartPost=/sbin/iptables -A INPUT -s 10.0.0.0/8 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -s 172.16.0.0/12 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -s 192.168.0.0/16 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -p tcp --dport 4194 -j DROP
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
啟動(dòng)服務(wù):
systemctl daemon-reload
service kubelet start
啟動(dòng)之后兰绣,需要去master節(jié)點(diǎn)進(jìn)行授權(quán)操作:
kubectl get csr|grep 'Pending' | awk '{print $1}'| xargs kubectl certificate approve
3. kube-proxy設(shè)置
準(zhǔn)備證書:
mkdir -p /etc/kubernetes/ca/kube-proxy
cd /etc/kubernetes/ca/kube-proxy
編輯kube-proxy-csr.json文件缀辩,內(nèi)容如下:
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "XS",
"O": "k8s",
"OU": "System"
}
]
}
簽發(fā)證書:
cfssl gencert \
-ca=/etc/kubernetes/ca/ca.pem \
-ca-key=/etc/kubernetes/ca/ca-key.pem \
-config=/etc/kubernetes/ca/ca-config.json \
-profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
生成各種配置文件:
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/ca/ca.pem \
--embed-certs=true \
--server=https://192.168.32.131:6443 \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=/etc/kubernetes/ca/kube-proxy/kube-proxy.pem \
--client-key=/etc/kubernetes/ca/kube-proxy/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
mv kube-proxy.kubeconfig /etc/kubernetes/kube-proxy.kubeconfig
編輯/lib/systemd/system/kube-proxy.service文件臀玄,內(nèi)容如下:
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/home/anakin/bin/kube-proxy \
--bind-address=192.168.32.132 \
--hostname-override=192.168.32.132 \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig \
--logtostderr=true \
--v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
啟動(dòng)服務(wù):
systemctl daemon-reload
service kube-proxy start
總結(jié)
中間可能會(huì)遇到的問題:
- calico
calico是以docker的方式運(yùn)行的,有時(shí)候重啟服務(wù)的時(shí)候荣恐,之前的container還沒殺死叠穆,日志里會(huì)報(bào)錯(cuò)誤:
Error response from daemon: Conflict. The container name "/aaa" is already in use by conta
iner "xxx".
這時(shí)候只要?jiǎng)h除這個(gè)container就可以了:
docker rm -f xxx
如果是報(bào)node的名字被占用的錯(cuò)誤,到master節(jié)點(diǎn)刪除就ok了:
calicoctl delete node
- 一些常用的命令:
查看集群節(jié)點(diǎn):
kubectl get nodes
查看calico節(jié)點(diǎn):
calicoctl node status
每個(gè)服務(wù)啟動(dòng)之后示损,都可以用下面的命令查看服務(wù)的日志信息:
journalctl -f -u xxx
ok嚷硫。寫的好累仔掸。