Kubernetes集群 for openEuler 22.03 LTS 二进制手动部署

本文档介绍在 openEuler 操作系统上，通过二进制部署 K8S 集群的一个参考方法。

说明：本文所有操作均使用root权限执行。

一、集群状态

本文所使用的集群状态如下：

集群结构：6 台openEuler 22.03 LTS系统的虚拟机，3 个 master 和 3 个 node 节点。
物理机：openEuler 22.03 LTS的x86/ARM服务器

二、手动部署集群

本章介绍手动部署 Kubernets 集群的方法。

环境说明

虚拟机列表：

HostName	配置	IPv4
k8smaster0	8C/8G/200G	192.168.122.154/24
k8smaster1	8C/8G/200G	192.168.122.155/24
k8smaster2	8C/8G/200G	192.168.122.156/24
k8snode1	8C/8G/300G	192.168.122.157/24
k8snode2	8C/8G/300G	192.168.122.158/24
k8snode3	8C/8G/300G	192.168.122.159/24

三、安装 Kubernetes 软件包

# dnf install -y docker conntrack-tools socat

EPOL 之后，可以直接通过 dnf 安装 K8S

# rpm -ivh kubernetes*.rpm

四、准备证书

声明：本文使用的证书为自签名，不能用于商用环境

部署集群前，需要生成集群各组件之间通信所需的证书。本文使用开源 CFSSL 作为验证部署工具，以便用户了解证书的配置和集群组件之间证书的关联关系。用户可以根据实际情况选择合适的工具，例如 OpenSSL 。

4.1 编译安装 CFSSL

编译安装 CFSSL 的参考命令如下（需要互联网下载权限，需要配置代理的请先完成配置），

# wget --no-check-certificate https://github.com/cloudflare/cfssl/archive/v1.5.0.tar.gz
# tar -zxf v1.5.0.tar.gz
# cd cfssl-1.5.0/
# make -j6
# cp bin/* /usr/local/bin/

4.2 生成根证书

编写 CA 配置文件，例如 ca-config.json：

# cat ca-config.json | jq
{
 "signing": {
  "default": {
    "expiry":"8760h"
 },
  "profiles": {
    "kubernetes": {
      "usages": [
        "signing",
        "key encipherment",
        "server auth",
        "client auth"
     ],
      "expiry":"8760h"
   }
 }
}
}

编写 CA CSR 文件，例如 ca-csr.json：

# cat ca-csr.json | jq
{
 "CN":"Kubernetes",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"openEuler",
    "OU":"WWW",
    "ST":"BinJiang"
 }
]
}

生成 CA 证书和密钥：

# cfssl gencert -initca ca-csr.json | cfssljson -bare ca

得到如下证书：

ca.csr ca-key.pem ca.pem

4.3 生成 admin 账户证书

admin 是 K8S 用于系统管理的一个账户，编写 admin 账户的 CSR 配置，例如 admin-csr.json：

# cat admin-csr.json | jq
{
 "CN":"admin",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"system:masters",
    "OU":"Containerum",
    "ST":"BinJiang"
 }
]
}

生成证书：

# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

结果如下：

admin.csr admin-key.pem admin.pem

4.4 生成 service-account 账户证书

编写 service-account 账户的 CSR 配置文件，例如 service-account-csr.json：

# cat service-account-csr.json | jq
{
 "CN":"service-accounts",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"Kubernetes",
    "OU":"openEuler k8s install",
    "ST":"BinJiang"
 }
]
}

生成证书：

# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json -profile=kubernetes service-account-csr.json | cfssljson -bare service-account

结果如下：

service-account.csr service-account-key.pem service-account.pem

4.5 生成 kube-controller-manager 组件证书

编写 kube-controller-manager 的 CSR 配置：

{
 "CN":"system:kube-controller-manager",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"system:kube-controller-manager",
    "OU":"openEuler k8s kcm",
    "ST":"BinJiang"
 }
]
}

生成证书：

# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json-profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager

结果如下：

kube-controller-manager.csr kube-controller-manager-key.pem kube-controller-manager.pem

4.6 生成 kube-proxy 证书

编写 kube-proxy 的 CSR 配置：

{
 "CN":"system:kube-proxy",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"system:node-proxier",
    "OU":"openEuler k8s kube proxy",
    "ST":"BinJiang"
 }
]
}

生成证书：

# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

结果如下：

kube-proxy.csr kube-proxy-key.pem kube-proxy.pem

4.7 生成 kube-scheduler 证书

编写 kube-scheduler 的 CSR 配置：

{
 "CN":"system:kube-scheduler",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"system:kube-scheduler",
    "OU":"openEuler k8s kube scheduler",
    "ST":"BinJiang"
 }
]
}

生成证书：

# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler

结果如下：

kube-scheduler.csr kube-scheduler-key.pem kube-scheduler.pem

4.8 生成 kubelet 证书

由于证书涉及到 kubelet 所在机器的 hostname 和 IP 地址信息，因此每个 node 节点配置不尽相同，所以编写脚本完成，生成脚本如下：

# cat node_csr_gen.bash

#!/bin/bash

nodes=(k8snode1 k8snode2 k8snode3)
IPs=("192.168.122.157""192.168.122.158""192.168.122.159")

for iin"${!nodes[@]}";do

cat >"${nodes[$i]}-csr.json" <<EOF
{
 "CN":"system:node:${nodes[$i]}",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"system:nodes",
    "OU":"openEuler k8s kubelet",
    "ST":"BinJiang"
 }
]
}
EOF

# generate ca
echo"generate:${nodes[$i]}${IPs[$i]}"
cfssl gencert-ca=../ca/ca.pem-ca-key=../ca/ca-key.pem-config=../ca/ca-config.json-hostname=${nodes[$i]},${IPs[$i]}-profile=kubernetes${nodes[$i]}-csr.json | cfssljson-bare${nodes[$i]}
done

说明：如果节点存在多个 IP 或者其他别名，-hostname 可以增加其他的 IP 或者 hostname

结果如下：

k8snode1.csr       k8snode1.pem       k8snode2-key.pem k8snode3-csr.json
k8snode1-csr.json k8snode2.csr       k8snode2.pem     k8snode3-key.pem
k8snode1-key.pem   k8snode2-csr.json k8snode3.csr     k8snode3.pem

CSR 配置信息，以 k8snode1 为例如下：

# cat k8snode1-csr.json
{
 "CN":"system:node:k8snode1",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"system:nodes",
    "OU":"openEuler k8s kubelet",
    "ST":"BinJiang"
 }
]
}

注意：由于每个 node 所属的账户组为system:node，因此 CSR 的 CN 字段都为system:node加上hostname。

4.9 生成 kube-apiserver 证书

编写 kube api server 的 CSR 配置文件：

# cat kubernetes-csr.json | jq
{
 "CN":"kubernetes",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"Kubernetes",
    "OU":"openEuler k8s kube api server",
    "ST":"BinJiang"
 }
]
}

生成证书和密钥：

# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json -hostname=10.32.0.1,192.168.122.154,192.168.122.155,192.168.122.156,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.svc.cluster.local -profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes

结果如下：

kubernetes.csr kubernetes-key.pem kubernetes.pem

说明：10.32.0.1 是内部 services 使用的 IP 地址区间，可以设置为其他值，后面启动 apiserver 服务时，会设置该参数。

4.10 生成 etcd 证书（可选）

部署 etcd 有两种方式：

在每个 api-server 对应的机器都启动一个 etcd 服务
独立部署一个 etcd 集群服务

如果是和 api-server 一起部署，那么直接使用上面生成的kubernetes-key.pem和kubernetes.pem证书即可。

如果是独立的etcd集群，那么需要创建证书如下：

编写 etcd 的 CSR 配置：

# cat etcd-csr.json | jq
{
 "CN":"ETCD",
 "key": {
  "algo":"rsa",
  "size":2048
},
 "names": [
 {
    "C":"CN",
    "L":"HangZhou",
    "O":"ETCD",
    "OU":"openEuler k8s etcd",
    "ST":"BinJiang"
 }
]
}

生成证书：

# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json -hostname=192.168.122.154,192.168.122.155,192.168.122.156,127.0.0.1 -profile=kubernetes etcd-csr.json | cfssljson -bare etcd

说明：假设 etcd 集群的 IP地址是 192.168.122.154,192.168.122.155,192.168.122.156

结果如下：

etcd.csr etcd-key.pem etcd.pem

五、安装 etcd

5.1 准备环境

使能 etcd 使用的端口：

# firewall-cmd --zone=public --add-port=2379/tcp
# firewall-cmd --zone=public --add-port=2380/tcp

5.2 安装 etcd 二进制

当前是通过 rpm 包安装

# rpm -ivh etcd*.rpm

准备目录

# mkdir -p /etc/etcd /var/lib/etcd
# cp ca.pem /etc/etcd/
# cp kubernetes-key.pem /etc/etcd/
# cp kubernetes.pem /etc/etcd/
--- 关闭selinux
# setenforce 0
--- 禁用/etc/etcd/etcd.conf文件的默认配置
--- 注释掉即可，例如：ETCD_LISTEN_CLIENT_URLS="http://localhost:2379"

5.3 编写 etcd.service 文件

以k8smaster0机器为例：

# cat /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=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash-c"ETCD_UNSUPPORTED_ARCH=arm64 /usr/bin/etcd --name=k8smaster0 --cert-file=/etc/etcd/kubernetes.pem --key-file=/etc/etcd/kubernetes-key.pem --peer-cert-file=/etc/etcd/kubernetes.pem --peer-key-file=/etc/etcd/kubernetes-key.pem --trusted-ca-file=/etc/etcd/ca.pem --peer-trusted-ca-file=/etc/etcd/ca.pem --peer-client-cert-auth --client-cert-auth --initial-advertise-peer-urls https://192.168.122.154:2380 --listen-peer-urls https://192.168.122.154:2380 --listen-client-urls https://192.168.122.154:2379,https://127.0.0.1:2379 --advertise-client-urls https://192.168.122.154:2379 --initial-cluster-token etcd-cluster-0 --initial-cluster k8smaster0=https://192.168.122.154:2380,k8smaster1=https://192.168.122.155:2380,k8smaster2=https://192.168.122.156:2380 --initial-cluster-state new --data-dir /var/lib/etcd"

Restart=always
RestartSec=10s
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

注意:

arm64上面需要增加启动设置ETCD_UNSUPPORTED_ARCH=arm64；
由于本文把etcd和k8s control部署在相同机器，所以使用了kubernetes.pem和kubernetes-key.pem证书来启动；
ca证书，在整个部署流程里面使用了一个，etcd可以生成自己的ca，然后用自己的ca签名其他证书，但是需要在apiserver访问etcd的client用该ca签名的证书；
initial-cluster需要把所有部署etcd的配置加上；
为了提高etcd的存储效率，可以使用ssd硬盘的目录，作为data-dir；

启动服务

# systemctl enable etcd
# systemctl start etcd

然后，依次部署其他机器即可。

5.4 验证基本功能

# ETCDCTL_API=3 etcdctl -w table endpoint status --endpoints=https://192.168.122.155:2379,https://192.168.122.156:2379,https://192.168.122.154:2379   --cacert=/etc/etcd/ca.pem   --cert=/etc/etcd/kubernetes.pem   --key=/etc/etcd/kubernetes-key.pem
+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|           ENDPOINT           |       ID       | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFTAPPLIED INDEX | ERRORS |
+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://192.168.122.155:2379 | b50ec873e253ebaa |  3.4.14 |  262 kB |    false |      false |      819 |        21 |          21 |       |
| https://192.168.122.156:2379 | e2b0d126774c6d02 |  3.4.14 |  262 kB |      true |      false |      819 |        21 |          21 |       |
| https://192.168.122.154:2379 | f93b3808e944c379 |  3.4.14 |  328 kB |    false |      false |      819 |        21 |          21 |       |
+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------

六、部署控制面组件

6.1 准备所有组件的 kubeconfig

6.1.1 kube-proxy

# kubectl config set-cluster openeuler-k8s --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.122.154:6443 --kubeconfig=kube-proxy.kubeconfig
# kubectl config set-credentials system:kube-proxy --client-certificate=/etc/kubernetes/pki/kube-proxy.pem --client-key=/etc/kubernetes/pki/kube-proxy-key.pem --embed-certs=true --kubeconfig=kube-proxy.kubeconfig
# kubectl config set-context default --cluster=openeuler-k8s --user=system:kube-proxy --kubeconfig=kube-proxy.kubeconfig
# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

6.1.2 kube-controller-manager

# kubectl config set-cluster openeuler-k8s --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://127.0.0.1:6443 --kubeconfig=kube-controller-manager.kubeconfig
# kubectl config set-credentials system:kube-controller-manager --client-certificate=/etc/kubernetes/pki/kube-controller-manager.pem --client-key=/etc/kubernetes/pki/kube-controller-manager-key.pem --embed-certs=true --kubeconfig=kube-controller-manager.kubeconfig
# kubectl config set-context default --cluster=openeuler-k8s --user=system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
# kubectl config use-context default --kubeconfig=kube-controller-manager.kubeconfig

6.1.3 kube-scheduler

# kubectl config set-cluster openeuler-k8s --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://127.0.0.1:6443 --kubeconfig=kube-scheduler.kubeconfig
# kubectl config set-credentials system:kube-scheduler --client-certificate=/etc/kubernetes/pki/kube-scheduler.pem --client-key=/etc/kubernetes/pki/kube-scheduler-key.pem --embed-certs=true --kubeconfig=kube-scheduler.kubeconfig
# kubectl config set-context default --cluster=openeuler-k8s --user=system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig
# kubectl config use-context default --kubeconfig=kube-scheduler.kubeconfig

6.1.4 admin

# kubectl config set-cluster openeuler-k8s --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://127.0.0.1:6443 --kubeconfig=admin.kubeconfig
# kubectl config set-credentials admin --client-certificate=/etc/kubernetes/pki/admin.pem --client-key=/etc/kubernetes/pki/admin-key.pem --embed-certs=true --kubeconfig=admin.kubeconfig
# kubectl config set-context default --cluster=openeuler-k8s --user=admin --kubeconfig=admin.kubeconfig
# kubectl config use-context default --kubeconfig=admin.kubeconfig

6.1.5 获得相关 kubeconfig 配置文件

admin.kubeconfig kube-proxy.kubeconfig kube-controller-manager.kubeconfig kube-scheduler.kubeconfig

6.2 生成密钥提供者的配置

api-server 启动时需要提供一个密钥对--encryption-provider-config=/etc/kubernetes/pki/encryption-config.yaml，本文通过 urandom 生成一个：

# cat generate.bash
#!/bin/bash

ENCRYPTION_KEY=$(head -c 32 /dev/urandom | base64)

cat > encryption-config.yaml <<EOF
kind: EncryptionConfig
apiVersion: v1
resources:
 - resources:
    - secrets
 providers:
    - aescbc:
       keys:
          - name: key1
           secret:${ENCRYPTION_KEY}
    - identity: {}
EOF
# api-server启动配置 --encryption-provider-config=/etc/kubernetes/pki/encryption-config.yaml

6.3 拷贝证书

本文把所有组件使用的证书、密钥以及配置统一放到/etc/kubernetes/pki/目录下。

--- 准备证书目录
# mkdir -p /etc/kubernetes/pki/
# ls /etc/kubernetes/pki/
admin-key.pem encryption-config.yaml             kube-proxy-key.pem     kubernetes.pem             service-account-key.pem
admin.pem     kube-controller-manager-key.pem     kube-proxy.kubeconfig kube-scheduler-key.pem     service-account.pem
ca-key.pem     kube-controller-manager.kubeconfig kube-proxy.pem         kube-scheduler.kubeconfig
ca.pem         kube-controller-manager.pem         kubernetes-key.pem     kube-scheduler.pem

6.4 部署 admin 角色的 RBAC

使能 admin role

# cat admin_cluster_role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
 rbac.authorization.kubernetes.io/autoupdate:"true"
labels:
 kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
 - apiGroups:
    -""
 resources:
    - nodes/proxy
    - nodes/stats
    - nodes/log
    - nodes/spec
    - nodes/metrics
 verbs:
    -"*"

--- 使能admin role
# kubectl apply --kubeconfig admin.kubeconfig -f admin_cluster_role.yaml

绑定 admin role

# cat admin_cluster_rolebind.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace:""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
 - apiGroup: rbac.authorization.k8s.io
 kind: User
 name: kubernetes

---# 绑定admin role
# kubectl apply --kubeconfig admin.kubeconfig -f admin_cluster_rolebind.yaml

6.5 部署 api server 服务

6.5.1 修改 apiserver 的 etc 配置文件

# cat /etc/kubernetes/apiserver
KUBE_ADVERTIS_ADDRESS="--advertise-address=192.168.122.154"
KUBE_ALLOW_PRIVILEGED="--allow-privileged=true"
KUBE_AUTHORIZATION_MODE="--authorization-mode=Node,RBAC"
KUBE_ENABLE_ADMISSION_PLUGINS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota"
KUBE_SECURE_PORT="--secure-port=6443"
KUBE_ENABLE_BOOTSTRAP_TOKEN_AUTH="--enable-bootstrap-token-auth=true"
KUBE_ETCD_CAFILE="--etcd-cafile=/etc/kubernetes/pki/ca.pem"
KUBE_ETCD_CERTFILE="--etcd-certfile=/etc/kubernetes/pki/kubernetes.pem"
KUBE_ETCD_KEYFILE="--etcd-keyfile=/etc/kubernetes/pki/kubernetes-key.pem"
KUBE_ETCD_SERVERS="--etcd-servers=https://192.168.122.154:2379,https://192.168.122.155:2379,https://192.168.122.156:2379"
KUBE_CLIENT_CA_FILE="--client-ca-file=/etc/kubernetes/pki/ca.pem"
KUBE_KUBELET_CERT_AUTH="--kubelet-certificate-authority=/etc/kubernetes/pki/ca.pem"
KUBE_KUBELET_CLIENT_CERT="--kubelet-client-certificate=/etc/kubernetes/pki/kubernetes.pem"
KUBE_KUBELET_CLIENT_KEY="--kubelet-client-key=/etc/kubernetes/pki/kubernetes-key.pem"
KUBE_KUBELET_HTTPS="--kubelet-https=true"
KUBE_PROXY_CLIENT_CERT_FILE="--proxy-client-cert-file=/etc/kubernetes/pki/kube-proxy.pem"
KUBE_PROXY_CLIENT_KEY_FILE="--proxy-client-key-file=/etc/kubernetes/pki/kube-proxy-key.pem"
KUBE_TLS_CERT_FILE="--tls-cert-file=/etc/kubernetes/pki/kubernetes.pem"
KUBE_TLS_PRIVATE_KEY_FILE="--tls-private-key-file=/etc/kubernetes/pki/kubernetes-key.pem"
KUBE_SERVICE_CLUSTER_IP_RANGE="--service-cluster-ip-range=10.32.0.0/16"
KUBE_SERVICE_ACCOUNT_ISSUER="--service-account-issuer=https://kubernetes.default.svc.cluster.local"
KUBE_SERVICE_ACCOUNT_KEY_FILE="--service-account-key-file=/etc/kubernetes/pki/service-account.pem"
KUBE_SERVICE_ACCOUNT_SIGN_KEY_FILE="--service-account-signing-key-file=/etc/kubernetes/pki/service-account-key.pem"
KUBE_SERVICE_NODE_PORT_RANGE="--service-node-port-range=30000-32767"
KUB_ENCRYPTION_PROVIDER_CONF="--encryption-provider-config=/etc/kubernetes/pki/encryption-config.yaml"
KUBE_REQUEST_HEADER_ALLOWED_NAME="--requestheader-allowed-names=front-proxy-client"
KUBE_REQUEST_HEADER_EXTRA_HEADER_PREF="--requestheader-extra-headers-prefix=X-Remote-Extra-"
KUBE_REQUEST_HEADER_GROUP_HEADER="--requestheader-group-headers=X-Remote-Group"
KUBE_REQUEST_HEADER_USERNAME_HEADER="--requestheader-username-headers=X-Remote-User"
KUBE_API_ARGS=""

所有apiserver的配置都/etc/kubernetes/config文件中定义，然后在后面的service文件中直接使用即可。

大部分配置都是比较固定的，部分需要注意：

--service-cluster-ip-range该地址需要和后面的设置的clusterDNS需要一致；

6.5.2 编写 apiserver 的 systemd 配置

# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://kubernetes.io/docs/reference/generated/kube-apiserver/
After=network.target
After=etcd.service

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/apiserver
ExecStart=/usr/bin/kube-apiserver \
    $KUBE_ADVERTIS_ADDRESS \
    $KUBE_ALLOW_PRIVILEGED \
    $KUBE_AUTHORIZATION_MODE \
    $KUBE_ENABLE_ADMISSION_PLUGINS \
    $KUBE_SECURE_PORT \
    $KUBE_ENABLE_BOOTSTRAP_TOKEN_AUTH \
    $KUBE_ETCD_CAFILE \
    $KUBE_ETCD_CERTFILE \
    $KUBE_ETCD_KEYFILE \
    $KUBE_ETCD_SERVERS \
    $KUBE_CLIENT_CA_FILE \
    $KUBE_KUBELET_CERT_AUTH \
    $KUBE_KUBELET_CLIENT_CERT \
    $KUBE_KUBELET_CLIENT_KEY \
    $KUBE_PROXY_CLIENT_CERT_FILE \
    $KUBE_PROXY_CLIENT_KEY_FILE \
    $KUBE_TLS_CERT_FILE \
    $KUBE_TLS_PRIVATE_KEY_FILE \
    $KUBE_SERVICE_CLUSTER_IP_RANGE \
    $KUBE_SERVICE_ACCOUNT_ISSUER \
    $KUBE_SERVICE_ACCOUNT_KEY_FILE \
    $KUBE_SERVICE_ACCOUNT_SIGN_KEY_FILE \
    $KUBE_SERVICE_NODE_PORT_RANGE \
    $KUBE_LOGTOSTDERR \
    $KUBE_LOG_LEVEL \
    $KUBE_API_PORT \
    $KUBELET_PORT \
    $KUBE_ALLOW_PRIV \
    $KUBE_SERVICE_ADDRESSES \
    $KUBE_ADMISSION_CONTROL \
    $KUB_ENCRYPTION_PROVIDER_CONF \
    $KUBE_REQUEST_HEADER_ALLOWED_NAME \
    $KUBE_REQUEST_HEADER_EXTRA_HEADER_PREF \
    $KUBE_REQUEST_HEADER_GROUP_HEADER \
    $KUBE_REQUEST_HEADER_USERNAME_HEADER \
    $KUBE_API_ARGS
Restart=on-failure
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

6.6 部署 controller-manager 服务

6.6.1 修改 controller-manager 配置文件

# cat /etc/kubernetes/controller-manager
KUBE_BIND_ADDRESS="--bind-address=127.0.0.1"
KUBE_CLUSTER_CIDR="--cluster-cidr=10.200.0.0/16"
KUBE_CLUSTER_NAME="--cluster-name=kubernetes"
KUBE_CLUSTER_SIGNING_CERT_FILE="--cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem"
KUBE_CLUSTER_SIGNING_KEY_FILE="--cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem"
KUBE_KUBECONFIG="--kubeconfig=/etc/kubernetes/pki/kube-controller-manager.kubeconfig"
KUBE_LEADER_ELECT="--leader-elect=true"
KUBE_ROOT_CA_FILE="--root-ca-file=/etc/kubernetes/pki/ca.pem"
KUBE_SERVICE_ACCOUNT_PRIVATE_KEY_FILE="--service-account-private-key-file=/etc/kubernetes/pki/service-account-key.pem"
KUBE_SERVICE_CLUSTER_IP_RANGE="--service-cluster-ip-range=10.32.0.0/24"
KUBE_USE_SERVICE_ACCOUNT_CRED="--use-service-account-credentials=true"
KUBE_CONTROLLER_MANAGER_ARGS="--v=2"

6.6.2 编写 controller-manager 的 systemd 配置文件

# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://kubernetes.io/docs/reference/generated/kube-controller-manager/

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/controller-manager
ExecStart=/usr/bin/kube-controller-manager \
    $KUBE_BIND_ADDRESS \
    $KUBE_LOGTOSTDERR \
    $KUBE_LOG_LEVEL \
    $KUBE_CLUSTER_CIDR \
    $KUBE_CLUSTER_NAME \
    $KUBE_CLUSTER_SIGNING_CERT_FILE \
    $KUBE_CLUSTER_SIGNING_KEY_FILE \
    $KUBE_KUBECONFIG \
    $KUBE_LEADER_ELECT \
    $KUBE_ROOT_CA_FILE \
    $KUBE_SERVICE_ACCOUNT_PRIVATE_KEY_FILE \
    $KUBE_SERVICE_CLUSTER_IP_RANGE \
    $KUBE_USE_SERVICE_ACCOUNT_CRED \
    $KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

6.7 部署 scheduler 服务

6.7.1 修改 scheduler 配置文件

# cat /etc/kubernetes/scheduler
KUBE_CONFIG="--kubeconfig=/etc/kubernetes/pki/kube-scheduler.kubeconfig"
KUBE_AUTHENTICATION_KUBE_CONF="--authentication-kubeconfig=/etc/kubernetes/pki/kube-scheduler.kubeconfig"
KUBE_AUTHORIZATION_KUBE_CONF="--authorization-kubeconfig=/etc/kubernetes/pki/kube-scheduler.kubeconfig"
KUBE_BIND_ADDR="--bind-address=127.0.0.1"
KUBE_LEADER_ELECT="--leader-elect=true"
KUBE_SCHEDULER_ARGS=""

6.7.2 编写 scheduler 的 systemd 配置文件

# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler Plugin
Documentation=https://kubernetes.io/docs/reference/generated/kube-scheduler/

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/scheduler
ExecStart=/usr/bin/kube-scheduler \
    $KUBE_LOGTOSTDERR \
    $KUBE_LOG_LEVEL \
    $KUBE_CONFIG \
    $KUBE_AUTHENTICATION_KUBE_CONF \
    $KUBE_AUTHORIZATION_KUBE_CONF \
    $KUBE_BIND_ADDR \
    $KUBE_LEADER_ELECT \
    $KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

6.8 使能各组件

# systemctl enable kube-controller-manager kube-scheduler kube-proxy
# systemctl restart kube-controller-manager kube-scheduler kube-proxy

6.9 基本功能验证

# curl --cacert /etc/kubernetes/pki/ca.pem https://192.168.122.154:6443/version
{
"major":"1",
"minor":"20",
"gitVersion":"v1.20.2",
"gitCommit":"faecb196815e248d3ecfb03c680a4507229c2a56",
"gitTreeState":"archive",
"buildDate":"2021-03-02T07:26:14Z",
"goVersion":"go1.15.7",
"compiler":"gc",
"platform":"linux/arm64"
}

七、部署 Node 节点组件

本章节仅以k8snode1节点为例。

7.1 环境准备

# 内网需要配置代理
# dnf install -y docker iSulad conntrack-tools socat containernetworking-plugins
# swapoff -a
# mkdir -p /etc/kubernetes/pki/
# mkdir -p /etc/cni/net.d
# mkdir -p /opt/cni
--- 删除默认kubeconfig
# rm /etc/kubernetes/kubelet.kubeconfig

--- 使用isulad作为运行时########
--- 配置iSulad
# cat /etc/isulad/daemon.json
{
      "registry-mirrors": [
              "docker.io"
     ],
      "insecure-registries": [
              "k8s.gcr.io",
              "quay.io"
     ],
      "pod-sandbox-image":"k8s.gcr.io/pause:3.2",# pause类型
      "network-plugin":"cni",# 置空表示禁用cni网络插件则下面两个路径失效， 安装插件后重启isulad即可
      "cni-bin-dir":"/usr/libexec/cni/",
      "cni-conf-dir":"/etc/cni/net.d",
}

--- 在iSulad环境变量中添加代理，下载镜像
# cat /usr/lib/systemd/system/isulad.service
[Service]
Type=notify
Environment="HTTP_PROXY=http://name:password@proxy:8080"
Environment="HTTPS_PROXY=http://name:password@proxy:8080"

--- 重启iSulad并设置为开机自启
# systemctl daemon-reload
# systemctl restart isulad




--- 如果使用docker作为运行时########
# dnf install -y docker
--- 如果需要代理的环境，可以给docker配置代理，新增配置文件http-proxy.conf，并编写如下内容，替换name，password和proxy-addr为实际的配置。
# cat /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
Environment="HTTP_PROXY=http://name:password@proxy-addr:8080"
# systemctl daemon-reload
# systemctl restart docker

7.2 创建 kubeconfig 配置文件

对各节点依次如下操作创建配置文件：

# kubectl config set-cluster openeuler-k8s \
  --certificate-authority=/etc/kubernetes/pki/ca.pem \
  --embed-certs=true \
  --server=https://192.168.122.154:6443 \
  --kubeconfig=k8snode1.kubeconfig

# kubectl config set-credentials system:node:k8snode1 \
  --client-certificate=/etc/kubernetes/pki/k8snode1.pem \
  --client-key=/etc/kubernetes/pki/k8snode1-key.pem \
  --embed-certs=true \
  --kubeconfig=k8snode1.kubeconfig

# kubectl config set-context default \
  --cluster=openeuler-k8s \
  --user=system:node:k8snode1 \
  --kubeconfig=k8snode1.kubeconfig

# kubectl config use-context default --kubeconfig=k8snode1.kubeconfig

注：修改k8snode1为对应节点名

7.3 拷贝证书

和控制面一样，所有证书、密钥和相关配置都放到/etc/kubernetes/pki/目录。

# ls /etc/kubernetes/pki/
ca.pem                 k8snode1.kubeconfig kubelet_config.yaml     kube-proxy-key.pem     kube-proxy.pem
k8snode1-key.pem k8snode1.pem         kube_proxy_config.yaml kube-proxy.kubeconfig

7.4 CNI 网络配置

先通过 containernetworking-plugins 作为 kubelet 使用的 cni 插件，后续可以引入 calico，flannel 等插件，增强集群的网络能力。

--- 桥网络配置
# cat /etc/cni/net.d/10-bridge.conf
{
 "cniVersion":"0.3.1",
 "name":"bridge",
 "type":"bridge",
 "bridge":"cnio0",
 "isGateway":true,
 "ipMasq":true,
 "ipam": {
  "type":"host-local",
  "subnet":"10.244.0.0/16",
  "gateway":"10.244.0.1"
},
 "dns": {
  "nameservers": [
    "10.244.0.1"
 ]
}
}

--- 回环网络配置
# cat /etc/cni/net.d/99-loopback.conf
{
  "cniVersion":"0.3.1",
  "name":"lo",
  "type":"loopback"
}

7.5 部署 kubelet 服务

7.5.1 kubelet 依赖的配置文件

# cat /etc/kubernetes/pki/kubelet_config.yaml
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
anonymous:
 enabled:false
webhook:
 enabled:true
x509:
 clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
mode: Webhook
clusterDNS:
-10.32.0.10
clusterDomain: cluster.local
runtimeRequestTimeout:"15m"
tlsCertFile:"/etc/kubernetes/pki/k8snode1.pem"
tlsPrivateKeyFile:"/etc/kubernetes/pki/k8snode1-key.pem"

注意：clusterDNS 的地址为：10.32.0.10，必须和之前设置的 service-cluster-ip-range 一致

7.5.2编写 systemd 配置文件

# cat /usr/lib/systemd/system/kubelet.service
[Unit]
Description=kubelet: The Kubernetes Node Agent
Documentation=https://kubernetes.io/docs/
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/usr/bin/kubelet \
--config=/etc/kubernetes/pki/kubelet_config.yaml \
--network-plugin=cni \
--pod-infra-container-image=k8s.gcr.io/pause:3.2 \
--kubeconfig=/etc/kubernetes/pki/k8snode1.kubeconfig \
--register-node=true \
--hostname-override=k8snode1 \
--cni-bin-dir="/usr/libexec/cni/" \
--v=2

Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target

注意：如果使用isulad作为runtime，需要增加如下配置

--container-runtime=remote \
--container-runtime-endpoint=unix:///var/run/isulad.sock \

7.6 部署 kube-proxy

7.6.1 kube-proxy 依赖的配置文件

# cat /etc/kubernetes/pki/kube_proxy_config.yaml
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
clientConnection:
kubeconfig: /etc/kubernetes/pki/kube-proxy.kubeconfig
clusterCIDR:10.244.0.0/16
mode:"iptables"

7.6.2 编写 systemd 配置文件

# cat /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://kubernetes.io/docs/reference/generated/kube-proxy/
After=network.target

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/proxy
ExecStart=/usr/bin/kube-proxy \
    $KUBE_LOGTOSTDERR \
    $KUBE_LOG_LEVEL \
    --config=/etc/kubernetes/pki/kube_proxy_config.yaml \
    --hostname-override=k8snode1 \
    $KUBE_PROXY_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

7.7 启动组件服务

# systemctl enable kubelet kube-proxy
# systemctl start kubelet kube-proxy

其他节点依次部署即可。

7.8 验证集群状态

等待几分钟，使用如下命令查看node状态：

# kubectl get nodes --kubeconfig /etc/kubernetes/pki/admin.kubeconfig
NAME           STATUS   ROLES   AGE   VERSION
k8snode1   Ready   <none>   17h   v1.20.2
k8snode2   Ready   <none>   19m   v1.20.2
k8snode3   Ready   <none>   12m   v1.20.2

7.9 部署 coredns

coredns可以部署到node节点或者master节点，本文这里部署到节点k8snode1。

7.9.1 编写 coredns 配置文件

# cat /etc/kubernetes/pki/dns/Corefile
.:53 {
 errors
 health {
   lameduck 5s
 }
 ready
 kubernetes cluster.local in-addr.arpa ip6.arpa {
   pods insecure
   endpoint https://192.168.122.154:6443
   tls /etc/kubernetes/pki/ca.pem /etc/kubernetes/pki/admin-key.pem /etc/kubernetes/pki/admin.pem
   kubeconfig /etc/kubernetes/pki/admin.kubeconfig default
   fallthrough in-addr.arpa ip6.arpa
 }
 prometheus :9153
 forward . /etc/resolv.conf {
   max_concurrent1000
 }
 cache30
 loop
 reload
 loadbalance
}

说明：

监听53端口；
设置kubernetes插件配置：证书、kube api的URL；

7.9.2 准备 systemd 的 service 文件

# cat /usr/lib/systemd/system/coredns.service
[Unit]
Description=Kubernetes Core DNS server
Documentation=https://github.com/coredns/coredns
After=network.target

[Service]
ExecStart=bash-c"KUBE_DNS_SERVICE_HOST=10.32.0.10 coredns -conf /etc/kubernetes/pki/dns/Corefile"

Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

7.9.3 启动服务

# systemctl enable coredns
# systemctl start coredns

7.9.4 创建 coredns 的 Service 对象

# cat coredns_server.yaml
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
 prometheus.io/port:"9153"
 prometheus.io/scrape:"true"
labels:
 k8s-app: kube-dns
 kubernetes.io/cluster-service:"true"
 kubernetes.io/name:"CoreDNS"
spec:
clusterIP:10.32.0.10
ports:
 - name: dns
 port:53
 protocol: UDP
 - name: dns-tcp
 port:53
 protocol: TCP
 - name: metrics
 port:9153
 protocol: TCP

7.9.5 创建 coredns 的 endpoint 对象

# cat coredns_ep.yaml
apiVersion: v1
kind: Endpoints
metadata:
name: kube-dns
namespace: kube-system
subsets:
 - addresses:
    - ip:192.168.122.157
 ports:
    - name: dns-tcp
     port:53
     protocol: TCP
    - name: dns
     port:53
     protocol: UDP
    - name: metrics
     port:9153
     protocol: TCP

7.9.6 确认 coredns 服务

--- 查看service对象
# kubectl get service -n kube-system kube-dns
NAME       TYPE       CLUSTER-IP   EXTERNAL-IP   PORT(S)                 AGE
kube-dns   ClusterIP  10.32.0.10   <none>        53/UDP,53/TCP,9153/TCP   51m
--- 查看endpoint对象
# kubectl get endpoints -n kube-system kube-dns
NAME       ENDPOINTS                                                   AGE
kube-dns  192.168.122.157:53,192.168.122.157:53,192.168.122.157:9153   52m

八、运行测试 pod

8.1 配置文件

# cat nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
 app: nginx
spec:
replicas:3
selector:
 matchLabels:
   app: nginx
template:
 metadata:
   labels:
     app: nginx
 spec:
   containers:
    - name: nginx
     image: nginx:1.14.2
     ports:
      - containerPort:80

8.2 启动 pod

通过kubectl命令运行nginx。

# kubectl apply -f nginx.yaml
deployment.apps/nginx-deployment created
# kubectl get pods
NAME                               READY   STATUS   RESTARTS   AGE
nginx-deployment-66b6c48dd5-6rnwz  1/1     Running  0         33s
nginx-deployment-66b6c48dd5-9pq49  1/1     Running  0         33s
nginx-deployment-66b6c48dd5-lvmng  1/1     Running  0         34s

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