k8s 部署一个应用到容器

这里以nginx为例，主要是提供一种思路。

　　　　需要用到基础镜像的时候，优先使用官方的，如果官方的不符合要求，则自己做一个，(不用使用centos镜像，推荐使用Alpine、busybox，都是精简过的，达到同样的功能，占用空间少了几百兆)

1.将配置文件储存为configmap

apiVersion: v1
data:
  nginx.conf: "user nginx;                     \nworker_processes auto;             \npid        /var/run/nginx.pid;\nworker_rlimit_nofile    65536;     \nevents {      \n      use epoll;                       \n      worker_connections 65535;    \n}\nhttp {\ncharset UTF-8; \nsendfile on;                \ntcp_nopush on;  \ntcp_nodelay on;\ntypes_hash_max_size 2048;\nkeepalive_timeout  65;\nclient_header_timeout 60s;\nclient_body_timeout 60s;\nsend_timeout 300s;\nserver_tokens off;               \nclient_max_body_size 8m;      \ninclude /etc/nginx/mime.types;\ndefault_type application/octet-stream;\nlog_format  main   - []       ;                     \naccess_log /var/log/nginx/nginx-access.log  main;\nerror_log /var/log/nginx/nginx-error.log;\n\n        limit_conn_zone $binary_remote_addr zone=perip:10m;\n        limit_conn_zone $server_name zone=perserver:10m;\n        limit_conn perip 200;\nlimit_conn perserver 200;\nlimit_rate 3000k;\n        add_header X-Cache $upstream_cache_status;\n        add_header X-Content-Type-Options nosniff;\ngzip on;\ngzip_disable \"msie6\";\n        gzip_vary on;\n        gzip_proxied any;\n        gzip_comp_level 6;\n        gzip_buffers 16 8k;\n        gzip_http_version 1.1;\n        gzip_types image/png text/plain application/javascript application/x-javascript text/css application/xml text/javascript application/x-httpd-php image/jpeg image/gif;   \ninclude /etc/nginx/conf.d/*.conf;     \n}\n\n\n"
kind: ConfigMap
metadata:
  name: nginx-conf
  namespace: default

2.创建一个deployment。

注：mountPath的方式挂载会覆盖整个nginx目录，挂载配置文件数据卷，通过subpath的方式指定挂载单个文件

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations: {}
  labels:
    app: nginx-test
  name: nginx-test
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx-test
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx-test
    spec:
      affinity: {}
      containers:
      - env:
        - name: TZ
          value: Asia/Shanghai
        - name: LANG
          value: C.UTF-8
        image: nginx:latest
        imagePullPolicy: Always
        lifecycle: {}
        name: nginx-test
        ports:
        - containerPort: 80
          name: web
          protocol: TCP
        resources:
          limits:
            cpu: 100m
            memory: 100Mi
          requests:
            cpu: 10m
            memory: 10Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /usr/share/zoneinfo/Asia/Shanghai
          name: tz-config
        - mountPath: /etc/localtime
          name: tz-config
        - mountPath: /etc/timezone
          name: timezone
        - mountPath: /etc/nginx/nginx.conf
          name: nginx-config
          readOnly: true
          subPath: nginx.conf
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
      volumes:
      - hostPath:
          path: /usr/share/zoneinfo/Asia/Shanghai
          type: ""
        name: tz-config
      - hostPath:
          path: /etc/timezone
          type: ""
        name: timezone
      - configMap:
          defaultMode: 420
          name: nginx-conf
        name: nginx-config

就是做了一件事，将之前保存到configmap的nginx配置文件挂载到镜像里面覆盖了原有的配置文件

注解：

配置文件挂载方式：
      volumes:
        - mountPath: /etc/nginx/nginx.conf
          name: nginx-config
          readOnly: true
          subPath: nginx.conf  #一定要指定文件这样他只会覆盖这个文件，要不然覆盖整个目录nginx就没办法启动了

k8s 部署一个应用到容器

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