不使用pvc的方式在K8S中部署apisix-gateway

我的apisix使用etcd作为数据存储服务器，官方的使用pvc方式或者docker-compose的方式，对于新手不太友好，本篇是从etcd的安装到apisix的打通都会涉及。

etcd 是一个分布式键值对存储，设计用来可靠而快速的保存关键数据并提供访问。通过分布式锁，leader选举和写屏障(write barriers)来实现可靠的分布式协作。etcd集群是为高可用，持久性数据存储和检索而准备。

ubuntu部署etcd
- ubuntu中部署etcd的两种方式：
  
  一种是去GitHub下载二进制的安装包，还有一种是apt-get install etcd，第二种方式我也尝试过，可能是我软件源的问题，版本有点老，所以我就换成了使用第一种方式，而且也比较推荐使用第一种方式。
- 我用的etcd下载的版本是3.5.2，废话不多说直接看步骤：
  
  1、将etcd etcdctl etcdutl 二进制文件拷贝到/usr/local/bin目录下
```
/usr/local/bin
```
  2、创建一个etcd的etcd.conf.yml，将下面代码拷贝进去，我这里etcd就简单的配置了一下，没有做集群，所以yml很简单。
```
name: etcd-1
data-dir: /home/etcd/data
listen-client-urls: http://0.0.0.0:2379
advertise-client-urls: http://0.0.0.0:2379
```
  3、通过etcd --config-file etcd.conf.yml的路径运行，如下图就是成功了，也可以使用etcd manager客户端来测试。
  
  4、如果使用etcd直接启动的话没有办法后台运行，所以我们需要在/etc/systemd/system目录下创建一个etcd.service来进行后台运行。
```
[Unit]
Description=ETCD Server
Documentation=https://github.com/coreos/etcd
After=network-online.target
Wants=network-online.target

[Service]
User=root
Group=root
ExecStart= etcd --config-file /home/etcd/etcd.conf.yml

[Install]
WantedBy=multi-user.target
```
  5、创建好之后可以通过以下命令来确定运行状态如下图：
```
# 启动
sudo systemctl start etcd.service
# 查看状态
sudo systemctl status etcd.service
# 开机自启
sudo systemctl enable etcd.service
```
  6、设置用户名和密码
```
# 设置版本为V3
export ETCDCTL_API=3
# 添加用户
etcdctl user add root
# 开启认证
etcdctl auth enable
```

apisix-gateway在部署的时候分为两块，分别是apisix和apisix-dashboard面板，所以看起来比较绕，不过apisix在部署的时候使用的是yaml文件覆盖的方式，所以我这里是将yaml存储到configmap中了，方便进行统一管理。我使用的k8s是Ubuntu出品的microk8s，用它的主要原因是因为配置简单。

apisix是服务端，用来进行网络请求转发。

apisix-dashboard是他的控制面板，用来进行可视化配置。

apisix介绍

apisix是基于 OpenResty + etcd 实现的云原生、高性能、可扩展的微服务 API 网关。它是国人开源，目前已经进入 Apache 进行孵化。APISIX 通过插件机制，提供了动态负载平衡、身份验证、限流限速等等功能，当然我们也可以自己开发插件进行拓展。
- 动态负载均衡：跨多个上游服务的动态负载均衡，目前已支持 round-robin 轮询和一致性哈希算法。
- 身份验证：支持 key-auth、JWT、basic-auth、wolf-rbac 等多种认证方式。
- 限流限速：可以基于速率、请求数、并发等维度限制。

部署apisix

1、创建apisix.conf.yaml，并存储到configmap中，

apisix:
node_listen: 9080              # APISIX listening port
enable_ipv6: false

allow_admin:                  # http://nginx.org/en/docs/http/ngx_http_access_module.html#allow
    - 0.0.0.0/0              # We need to restrict ip access rules for security. 0.0.0.0/0 is for test.

admin_key:
- name: "admin"
    key: edd1c9f034335f136f87ad84b625c8f1
    role: admin                 # admin: manage all configuration data
                                # viewer: only can view configuration data
- name: "viewer"
    key: 4054f7cf07e344346cd3f287985e76a2
    role: viewer

enable_control: true
control:
    ip: "0.0.0.0"
    port: 9092

etcd:
host:          # supports defining multiple etcd host addresses for an etcd cluster
    - "http://192.168.31.170:2379"
user: "root"    # ignore etcd username if not enable etcd auth
password: "root"  # ignore etcd password if not enable etcd auth

discovery:
nacos:
    host:
    - "http://47.100.213.49:8848"
    prefix: "/nacos/v1/"
    fetch_interval: 30    # default 30 sec
    weight: 100           # default 100
    timeout:
    connect: 2000       # default 2000 ms
    send: 2000          # default 2000 ms
    read: 5000          # default 5000 ms

plugin_attr:
prometheus:
    export_addr:
    ip: "0.0.0.0"
    port: 9091

plugins:
- client-control
- ext-plugin-pre-req
- zipkin
- request-id
- fault-injection
- serverless-pre-function
- batch-requests
- cors
- ip-restriction
- ua-restriction
- referer-restriction
- uri-blocker
- request-validation
- openid-connect
- wolf-rbac
- hmac-auth
- basic-auth
- jwt-auth
- key-auth
- consumer-restriction
- authz-keycloak
- proxy-mirror
- proxy-cache
- proxy-rewrite
- api-breaker
- limit-conn
- limit-count
- limit-req
- gzip
- server-info
- traffic-split
- redirect
- response-rewrite
- grpc-transcode
- prometheus
- echo
- http-logger
- sls-logger
- tcp-logger
- kafka-logger
- syslog
- udp-logger
- serverless-post-function
- ext-plugin-post-req

stream_plugins:
- ip-restriction
- limit-conn
- mqtt-proxy

2、使用kubectl命令创建configmap

kubectl create configmap sukt-apisix-gateway-config --from-file=config.yaml=/home/sukt-platform/apisix/apisix-gateway-config.yaml -n sukt-platform

3、新建apisix-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
name: sukt-apisix-gateway
namespace: sukt-platform
spec:
selector:
    matchLabels:
    app: sukt-apisix-gateway
template:
    metadata:
    labels:
        app: sukt-apisix-gateway
    spec:
    containers:
    - name: sukt-apisix-gateway
        image: apache/apisix:2.10.3-alpine
        imagePullPolicy: IfNotPresent
        resources:
        limits:
            cpu: 500m
            memory: 1Gi
        requests:
            cpu: 250m
            memory: 256Mi
        securityContext:
        privileged: false
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /usr/local/apisix/conf/config.yaml
        name: config
        subPath: config.yaml
        ports:
        - containerPort: 9080
        - containerPort: 9443
    dnsPolicy: ClusterFirst
    restartPolicy: Always
    schedulerName: default-scheduler
    securityContext: {}
    terminationGracePeriodSeconds: 30
    volumes:
        - configMap:
            defaultMode: 420
            name: sukt-apisix-gateway-config
        name: config

4、新建apisix-service.yaml

apiVersion: v1
kind: Service
metadata:
name: sukt-apisix-gateway-nodetype
labels:
    app: sukt-apisix-gateway-nodetype
namespace: sukt-platform
spec:
type: NodePort
selector:
    app: sukt-apisix-gateway
ports:
- port: 9080
    name: transfer1
    targetPort: 9080
    nodePort: 30107
- port: 9443
    name: transfer2
    targetPort: 9443
    nodePort: 30108

部署apisix-dashboard

1、创建apisix-dashboard-config.yaml，并存储到configmap中，

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

conf:
listen:
    host: 0.0.0.0     # `manager api` listening ip or host name
    port: 9000          # `manager api` listening port
allow_list:           # If we don't set any IP list, then any IP access is allowed by default.
    - 0.0.0.0/0
etcd:
    endpoints:          # supports defining multiple etcd host addresses for an etcd cluster
    - "http://192.168.31.170:2379"
                        # yamllint disable rule:comments-indentation
                        # etcd basic auth info
    username: "root"    # ignore etcd username if not enable etcd auth
    password: "root"  # ignore etcd password if not enable etcd auth
    mtls:
    key_file: ""          # Path of your self-signed client side key
    cert_file: ""         # Path of your self-signed client side cert
    ca_file: ""           # Path of your self-signed ca cert, the CA is used to sign callers' certificates
    # prefix: /apisix     # apisix config's prefix in etcd, /apisix by default
log:
    error_log:
    level: warn       # supports levels, lower to higher: debug, info, warn, error, panic, fatal
    file_path:
        logs/error.log  # supports relative path, absolute path, standard output
                        # such as: logs/error.log, /tmp/logs/error.log, /dev/stdout, /dev/stderr
    access_log:
    file_path:
        logs/access.log  # supports relative path, absolute path, standard output
                        # such as: logs/access.log, /tmp/logs/access.log, /dev/stdout, /dev/stderr
                        # log example: 2020-12-09T16:38:09.039+0800    INFO    filter/logging.go:46    /apisix/admin/routes/r1 {"status": 401, "host": "127.0.0.1:9000", "query": "asdfsafd=adf&a=a", "requestId": "3d50ecb8-758c-46d1-af5b-cd9d1c820156", "latency": 0, "remoteIP": "127.0.0.1", "method": "PUT", "errs": []}
authentication:
secret:
    secret              # secret for jwt token generation.
                        # NOTE: Highly recommended to modify this value to protect `manager api`.
                        # if it's default value, when `manager api` start, it will generate a random string to replace it.
expire_time: 3600     # jwt token expire time, in second
users:                # yamllint enable rule:comments-indentation
    - username: admin   # username and password for login `manager api`
    password: P@ssW0rd
    - username: user
    password: P@ssW0rd

plugins:                          # plugin list (sorted in alphabetical order)
- api-breaker
- authz-keycloak
- basic-auth
- batch-requests
- consumer-restriction
- cors
# - dubbo-proxy
- echo
# - error-log-logger
# - example-plugin
- fault-injection
- grpc-transcode
- hmac-auth
- http-logger
- ip-restriction
- jwt-auth
- kafka-logger
- key-auth
- limit-conn
- limit-count
- limit-req
# - log-rotate
# - node-status
- openid-connect
- prometheus
- proxy-cache
- proxy-mirror
- proxy-rewrite
- redirect
- referer-restriction
- request-id
- request-validation
- response-rewrite
- serverless-post-function
- serverless-pre-function
# - skywalking
- sls-logger
- syslog
- tcp-logger
- udp-logger
- uri-blocker
- wolf-rbac
- zipkin
- server-info
- traffic-split

2、使用kubectl命令创建configmap

kubectl create configmap sukt-apisix-dashboard-config --from-file=config.yaml=/home/sukt-platform/apisix/apisix-dashboard-config.yaml -n sukt-platform

3、新建apisix-dashboard-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
name: sukt-apisix-dashboard
namespace: sukt-platform
spec:
selector:
    matchLabels:
    app: sukt-apisix-dashboard
template:
    metadata:
    labels:
        app: sukt-apisix-dashboard
    spec:
    nodeName: microk8sslave1 # 部署到指定的node节点
    containers:
    - name: sukt-apisix-dashboard
        image: apache/apisix-dashboard:2.10.1-alpine
        imagePullPolicy: IfNotPresent
        resources:
        limits:
            cpu: 500m
            memory: 1Gi
        requests:
            cpu: 250m
            memory: 256Mi
        securityContext:
        privileged: false
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /usr/local/apisix-dashboard/conf/conf.yaml
        name: config
        subPath: config.yaml #这个位置对应的是comfigmap中的名字，不是 /usr/local/apisix-dashboard/conf/conf.yaml
        ports:
        - containerPort: 9000
    dnsPolicy: ClusterFirst
    restartPolicy: Always
    schedulerName: default-scheduler
    securityContext: {}
    terminationGracePeriodSeconds: 30
    volumes:
        - configMap:
            defaultMode: 420
            name: sukt-apisix-dashboard-config
        name: config

4、新建apisix-dashboard-service.yaml

apiVersion: v1
kind: Service
metadata:
name: sukt-apisix-dashboard-nodetype
labels:
    app: sukt-apisix-dashboard-nodetype
namespace: sukt-platform
spec:
type: NodePort
selector:
    app: sukt-apisix-dashboard
ports:
- port: 9000
    name: transfer1
    targetPort: 9000
    nodePort: 30109