今天是K8S实战-构建Django项目，最后一讲。前面5将我们一步步通过k8s构建了一个django项目，通过考虑实际生产环境，我们添加了初始化功能，自动化构建功能，共享存储，数据加密，监控方案，日志方案。从无到有，我们一同走了一遍。最后一讲，我将带着大家利用现有的资源实现最简单的持续构建。
持续构建
设计
gitlab+jenkins+node+dockerfile+k8s
gitlab作为仓库，jenkins设置触发器，node作为执行节点，dockerfile生产镜像，k8s构建资源。
实现自动化构建环境
你需要参照我之前的教程搭建gitlab+jenkins创建一个自动化构建环境。请一定要确保你的自动化构建环境是正常的！
创建gitlab工程项目
创建一个工程，这里的工程名是接下来jenkins的任务名，通过设定好的gitlab地址，可以获取到gitlab上代码的变更，从而触发jenkins任务。
编写Jenkins触发任务
新建一个job，然后选择一个可以进行构建的节点。
我之前已经构建好了相关镜像，这次就不用重新构建镜像。
验证node节点
这里只需要确保node节点有java环境，docker环境，k8s环境。
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验证持续集成
通过更新gitlab相关工程代码，jenkins检测到gitlab代码变更，开始执行shell 任务，在选定的执行机上，执行了django项目的构建。
从控制台输出中可以看出资源已经创建，然后再去访问项目地址，发现项目可以正常访问。
如果你要重现这些，我建议你必须阅读之前的《》《》《》《》。还有我上传到gitlab上的代码是3.0版本的django项目的django_deploy.yaml和django_nfs.yaml。如果你需要测试4.0版本django项目，你还需自行上传相关资源。最后附上目录gitlab上django_polls的工程结构和相关代码。
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:
initContainers:
- name: mysql-init
image: busybox
imagePullPolicy: IfNotPresent
command:
- sh
- "-c"
- |
set -ex
cat > /start_script/mysql_init.sh <<EOF
#!/bin/bash
sed -i "/log-error/iskip-grant-tables" /etc/my.cnf
systemctl restart mysqld
sleep 50
mysql -uroot -p123qwe -e "CREATE DATABASE polls DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;"
mysql -uroot -p123qwe -e "use mysql;"
mysql -uroot -p123qwe -e "grant all privileges on *.* to root@'%' identified by "123qwe";"
mysql -uroot -p123qwe -e "flush privileges;"
systemctl restart mysqld
EOF
chmod +x /start_script/mysql_init.sh
volumeMounts:
- name: mysql-initdb
mountPath: /start_script
volumes:
- name: mysql-initdb
persistentVolumeClaim:
claimName: mypvc1
- name: mysql-data
persistentVolumeClaim:
claimName: mysqlpvc
containers:
- image: centos7:mysql3
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 -p $MYSQL_PWD -e "SELECT 1"
initialDelaySeconds: 10
timeoutSeconds: 1
successThreshold: 1
failureThreshold: 3
periodSeconds: 5
volumeMounts:
- name: mysql-initdb
mountPath: /start_script
- name: mysql-data
mountPath: /raiddisk
apiVersion: v1
kind: Service
metadata:
name: mysql-svc
spec:
selector:
app: 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:
initContainers:
- name: django-init
image: busybox
imagePullPolicy: IfNotPresent
command:
- sh
- "-c"
- |
set -ex
cat > /start_script/django_init.sh <<EOF
#!/bin/bash
mkdir /root/django
cd /root/django
git clone https://github.com/cuigelasi/learn_django.git
cd /root/django/learn_django
git checkout -t origin/polls
sed -i "s/172.10.1.2/10.101.1.1/" learn_django/settings.py
sleep 60
python manage.py makemigrations
python manage.py migrate
echo "from django.contrib.auth.models import User; User.objects.create_superuser('admin', '[email protected]', '123qwe')" | python manage.py shell
python manage.py runserver 0.0.0.0:8000
EOF
chmod +x /start_script/django_init.sh
volumeMounts:
- name: django-initdb
mountPath: /start_script
containers:
- image: centos7:django3
name: django
volumeMounts:
- name: django-initdb
mountPath: /start_script
readinessProbe:
exec:
command:
- cat
- /root/django/learn_django/learn_django/settings.py
initialDelaySeconds: 10
periodSeconds: 5
volumes:
- name: django-initdb
persistentVolumeClaim:
claimName: mypvc1
- name: django-data
persistentVolumeClaim:
claimName: djangopvc
apiVersion: v1
kind: Service
metadata:
name: django-svc
spec:
type: NodePort
selector:
app: django
clusterIP: 10.101.1.2
ports:
- protocol: TCP
nodePort: 30008
port: 8000
targetPort: 8000
|
django_nfs.yaml
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|
apiVersion: v1
kind: PersistentVolume
metadata:
name: mypv1
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: mynfs
nfs:
path: /nfs-share
server: 172.16.2.237
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mypvc1
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: mynfs
apiVersion: v1
kind: PersistentVolume
metadata:
name: mysqlpv
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: mysqlnfs
nfs:
path: /mysql-share
server: 172.16.2.237
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysqlpvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: mysqlnfs
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: djangopv
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: djangonfs
nfs:
path: /django-share
server: 172.16.2.237
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: djangopvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: djangonfs
|
结束语
K8S实战-构建Django项目，已经圆满结束。感谢大家的一路支持，作为一个IT人，每天都有无尽的知识等待学习，我相信天道酬勤，努力学习总有展示才华的机会。
原文:大专栏 K8S实战-构建Django项目-06-持续构建
