K8S实战-构建Django项目-01-初始化

其他 2019-10-18 16:34:11 阅读次数: 0

前面的教程，已经带着大家初步了解了K8S，接下来我们要通过实战，使用K8S去设计和构建常用项目。第一个项目，我选择Django，这是一个非常成熟的Web后台系统，通过Django我们可以构建一个稳健的Web业务。

准备

K8S

前期需要准备一个K8S环境，在前面的教程，我们已经可以通过自动化脚本搭建。可以参考这边博文

Images

django2.02

Dockerfile

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FROM centos7:ssh
MAINTAINER from cgls
RUN yum -y install openssh* tar zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make && 
    mkdir /usr/local/python3 && 
    cd /usr/local/python3 && 
    wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz && 
    tar -zxf Python-3.6.4.tgz && 
    cd Python-3.6.4 && 
    ./configure --prefix=/usr/local/python3 && 
    make && make install && 
    cd /usr/bin && 
    mv python python.bk && 
    ln -s /usr/local/python3/bin/python3 /usr/bin/python && 
    sed -i "s/python/python2.7/" /usr/bin/yum && 
    sed -i "s/python/python2.7/" /usr/libexec/urlgrabber-ext-down && 
    sed -i "s/python/python2.7/" /usr/bin/yum-config-manager && 
    cd && 
    python -m pip install --upgrade pip && 
    python -m pip install django==2.0.2 && 
    python -m pip install django-bootstrap3 && 
    python -m pip install pymysql && 
    python -m pip install requests && 
    python -m pip install bs4
CMD ["/usr/sbin/init"]

这里我是在centos7:ssh镜像基础上构建的，这个镜像就是在官方镜像上添加了ssh服务。大家可以自行构建~~

docker build -t centos:django2.02 .

mysql:5.7

Dockerfile

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FROM centos7:ssh
MAINTAINER from cgls
RUN yum -y install wget && 
    cd /usr/local/src/ && 
    wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm && 
    rpm -ivh mysql57-community-release-el7-8.noarch.rpm && 
    yum -y install mysql-server && 
    mkdir -p /raiddisk/mysqldata && 
    chown mysql:mysql /raiddisk/mysqldata && 
    /usr/sbin/mysqld --initialize-insecure --datadir=/raiddisk/mysqldata --user=mysql && 
    sed -i 's/datadir=/var/lib/mysql/# datadir=/var/lib/mysql/g' /etc/my.cnf && 
    echo -e "# addncharacter-set-server = utf8ndatadir = /raiddisk/mysqldatanlower_case_table_names = 1nexpire_logs_days = 2ninnodb_buffer_pool_size = 512Mnmax_connections=1500nmax_connect_errors = 50nmax_allowed_packet = 64Mninnodb_file_per_table=1nkey_buffer_size = 4096Mnsort_buffer_size=64Mnmyisam_sort_buffer_size=64Mnread_buffer_size=2Mntable_open_cache = 2048ntmp_table_size = 128Mnmax_heap_table_size = 128Mnread_rnd_buffer_size = 128Mnthread_cache_size = 64nbulk_insert_buffer_size = 64Mnmyisam_max_sort_file_size = 30Gnmyisam_repair_threads = 1nquery_cache_size = 64Mnquery_cache_limit = 2Mnthread_stack = 192Knslow_query_log" >> /etc/my.cnf && 
    systemctl enable mysqld.service
CMD ["/usr/sbin/init"]

create.sh

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!/bin/bash
mysql -uroot<<EOF 
alter user 'root'@'localhost' identified by '123qwe'; 
grant all privileges on *.* to 'cgls'@'%' identified by '123qwe'; 
flush privileges; 
exit 
EOF

install.sh

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!/bin/bash
docker build -t centos7:mysql .
sleep 3
docker run -itd --name mysql_create centos7:mysql
docker cp create.sh mysql_create:/root
docker -it exec mysql_create sh create.sh
docker commit mysql_create centos7:mysql5.7
docker rm -f -v mysql_create

sh install.sh

设计

我们的django项目，精简版只需要2个服务，mysql服务、django服务。现在镜像已经准备好了，现在要设计服务。

之前我们学习过健康检查，如果服务不能正常运行，一切都是白搭，所以健康检查是一定要有的。除此之外，我们要考虑获取django工程，在构建django服务时，获取最新的django工程并运行。如果django工程需要正常运行，那么我们还需要mysql服务能够正常运行，mysql服务这次暂不做读写分离，仅仅固定cluster_ip即可。

扫描二维码关注公众号，回复： 7499109 查看本文章

mysql_deployment.yaml

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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: mysql
  name: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:  
      containers:
      - image: mysql
        name: mysql
        imagePullPolicy: IfNotPresent
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: 123qwe
        readinessProbe:
          exec:
            command:
            - /bin/sh
            - "-c"
            - MYSQL_PWD="${MYSQL_ROOT_PASSWORD}"
            - mysql -h 127.0.0.1 -u root -e "SELECT 1"
          initialDelaySeconds: 10
          timeoutSeconds: 1
          successThreshold: 1
          failureThreshold: 3
          periodSeconds: 5

mysql_service.yaml

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大专栏  K8S实战-构建Django项目-01-初始化ass="line">6
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apiVersion: v1
kind: Service
metadata:
  name: mysql-svc
spec:
  selector:
    run: mysql
  clusterIP: 10.101.1.1
  ports:
  - protocol: TCP
    port: 3306
    targetPort: 3306

django_deployment.yaml

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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: django
  name: django
spec:
  replicas: 1
  selector:
    matchLabels:
      app: django
  template:
    metadata:
      labels:
        app: django
    spec:
      containers:
      - image: centos7:django2.02
        name: django
        args:
        - /bin/sh
        - -c
        - cd /root; wget http://172.16.1.150/healthy.conf; sleep 365d
        readinessProbe:
          exec:
            command:
            - cat
            - /root/healthy.conf
          initialDelaySeconds: 10
          periodSeconds: 5

django_service.yaml

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apiVersion: v1
kind: Service
metadata:
  name: django-svc
spec:
  selector:
    run: django
  clusterIP: 10.101.1.2
  ports:
  - protocol: TCP
    port: 8000
    targetPort: 8000

启动的时候，需要按照顺序依次执行即可~~

kubectl apply -f mysql_deployment.yaml

kubectl apply -f mysql_service.yaml

kubectl apply -f django_deployment.yaml

kubectl apply -f django_service.yaml

如果嫌麻烦，可以把所有文件整成一个

django_deploy.yaml

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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: mysql
  name: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:  
      containers:
      - image: mysql
        name: mysql
        imagePullPolicy: IfNotPresent
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: 123qwe
        readinessProbe:
          exec:
            command:
            - /bin/sh
            - "-c"
            - MYSQL_PWD="${MYSQL_ROOT_PASSWORD}"
            - mysql -h 127.0.0.1 -u root -e "SELECT 1"
          initialDelaySeconds: 10
          timeoutSeconds: 1
          successThreshold: 1
          failureThreshold: 3
          periodSeconds: 5
      
---

apiVersion: v1
kind: Service
metadata:
  name: mysql-svc
spec:
  selector:
    run: mysql
  clusterIP: 10.101.1.1
  ports:
  - protocol: TCP
    port: 3306
    targetPort: 3306
    
---

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: django
  name: django
spec:
  replicas: 1
  selector:
    matchLabels:
      app: django
  template:
    metadata:
      labels:
        app: django
    spec:
      containers:
      - image: centos7:django2.02
        name: django
        args:
        - /bin/sh
        - -c
        - cd /root; wget http://172.16.1.150:/healthy.conf; sleep 365d
        readinessProbe:
          exec:
            command:
            - cat
            - /root/healthy.conf
          initialDelaySeconds: 10
          periodSeconds: 5
          
---

apiVersion: v1
kind: Service
metadata:
  name: django-svc
spec:
  selector:
    run: django
  clusterIP: 10.101.1.2
  ports:
  - protocol: TCP
    port: 8000
    targetPort: 8000

1541573929203

1541573948720

最基础的架子已经打好，接下来我们要一般般优化直至可以用于生产环境。

大家可以思考一下，如何在资源创建后立马启动django工程~~~

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