mirror of https://github.com/helm/helm
Robert Leenders
10 years ago
parent
1cff534a6d
commit
320a0e9b6d
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# Wordpress Example
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Welcome to the Wordpress example. It shows you how to deploy a Wordpress application using Deployment Manager.
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## Prerequisites
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### Deployment Manager
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First, make sure DM is installed in your Kubernetes cluster by following the instructions in the top level
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[README.md](../../README.md).
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### Google Cloud Resources
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The Wordpress application will make use of several persistent disks, which we will host on Google Cloud. To create these disks we will create a deployment using Google Cloud Deployment Manager:
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```gcloud deployment-manager deployments create wordpress-resources --config wordpress-resources.yaml```
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where `wordpress-resources.yaml` looks as follows:
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```
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resources:
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- name: nfs-disk
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type: compute.v1.disk
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properties:
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zone: us-central1-b
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sizeGb: 200
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- name: mysql-disk
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type: compute.v1.disk
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properties:
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zone: us-central1-b
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sizeGb: 200
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```
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### Privileged containers
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To use NFS we need to be able to launch privileged containers. If your Kubernetes cluster doesn't support this you can either manually change this in every Kubernetes minion or you could set the flag at `kubernetes/saltbase/pillar/privilege.sls` to true and (re)launch your Kubernetes cluster. Once Kubernetes 1.1 releases this should be enabled by default.
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## Understanding the Wordpress example template
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Let's take a closer look at the template used by the Wordpress example. The Wordpress application consists of 4 microservices: an nginx service, a wordpress-php service, a MySQL service, and an NFS service. The architecture looks as follows:
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### Variables
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The template contains the following variables:
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```
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{% set PROJECT = properties['project'] or 'dm-k8s-testing' %}
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{% set NFS_SERVER = properties['nfs-server'] or {} %}
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{% set NFS_SERVER_IP = NFS_SERVER['ip'] or '10.0.253.247' %}
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{% set NFS_SERVER_PORT = NFS_SERVER['port'] or 2049 %}
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{% set NFS_SERVER_DISK = NFS_SERVER['disk'] or 'nfs-disk' %}
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{% set NFS_SERVER_DISK_FSTYPE = NFS_SERVER['fstype'] or 'ext4' %}
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{% set NGINX = properties['nginx'] or {} %}
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{% set NGINX_PORT = 80 %}
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{% set NGINX_REPLICAS = NGINX['replicas'] or 2 %}
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{% set WORDPRESS_PHP = properties['wordpress-php'] or {} %}
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{% set WORDPRESS_PHP_REPLICAS = WORDPRESS_PHP['replicas'] or 2 %}
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{% set WORDPRESS_PHP_PORT = WORDPRESS_PHP['port'] or 9000 %}
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{% set MYSQL = properties['mysql'] or {} %}
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{% set MYSQL_PORT = MYSQL['port'] or 3306 %}
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{% set MYSQL_PASSWORD = MYSQL['password'] or 'mysql-password' %}
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{% set MYSQL_DISK = MYSQL['disk'] or 'mysql-disk' %}
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{% set MYSQL_DISK_FSTYPE = MYSQL['fstype'] or 'ext4' %}
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```
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### Nginx service
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The nginx service is a replicated service with 2 replicas:
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```
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- name: nginx
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_port: {{ NGINX_PORT }}
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container_port: {{ NGINX_PORT }}
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replicas: {{ NGINX_REPLICAS }}
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external_service: true
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image: gcr.io/{{ PROJECT }}/nginx:latest
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volumes:
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- mount_path: /var/www/html
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nfs:
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server: {{ NFS_SERVER_IP }}
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path: /
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```
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The nginx image builds upon the standard nginx image and simply copies a custom configuration file.
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### Wordpress-php service
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The wordpress-php service is a replicated service with 2 replicas:
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```
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- name: wordpress-php
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_name: wordpress-php
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service_port: {{ WORDPRESS_PHP_PORT }}
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container_port: {{ WORDPRESS_PHP_PORT }}
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replicas: 2
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image: wordpress:fpm
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env:
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- name: WORDPRESS_DB_PASSWORD
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value: {{ MYSQL_PASSWORD }}
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- name: WORDPRESS_DB_HOST
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value: mysql-service
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volumes:
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- mount_path: /var/www/html
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nfs:
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server: {{ NFS_SERVER_IP }}
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path: /
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```
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### MySQL service
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The MySQL service is a replicated service with a single replica:
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```
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- name: mysql
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_port: {{ MYSQL_PORT }}
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container_port: {{ MYSQL_PORT }}
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replicas: 1
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image: mysql:5.6
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env:
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- name: MYSQL_ROOT_PASSWORD
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value: {{ MYSQL_PASSWORD }}
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volumes:
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- mount_path: /var/lib/mysql
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gcePersistentDisk:
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pdName: {{ MYSQL_DISK }}
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fsType: {{ MYSQL_DISK_FSTYPE }}
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```
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### NFS service
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The NFS service is a replicated service with a single replica:
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```
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- name: nfs-server
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_port: {{ NFS_SERVER_PORT }}
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container_port: {{ NFS_SERVER_PORT }}
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replicas: 1 # Has to be 1 because of the persistent disk
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image: jsafrane/nfs-data
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privileged: true
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cluster_ip: {{ NFS_SERVER_IP }}
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volumes:
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- mount_path: /mnt/data
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gcePersistentDisk:
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pdName: {{ NFS_SERVER_DISK }}
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fsType: {{ NFS_SERVER_DISK_FSTYPE }}
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```
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## Deploying Wordpress
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We can now deploy Wordpress using:
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```
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dm deploy examples/wordpress/wordpress.jinja
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```
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@ -0,0 +1,2 @@
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FROM nginx
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COPY default.conf /etc/nginx/conf.d/default.conf
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.PHONY: all build push clean
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PREFIX = gcr.io/$(PROJECT)
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IMAGE = nginx
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TAG = latest
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DIR = .
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all: build
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build:
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docker build -t $(PREFIX)/$(IMAGE):$(TAG) $(DIR)
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push: build
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gcloud docker push $(PREFIX)/$(IMAGE):$(TAG)
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clean:
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docker rmi $(PREFIX)/$(IMAGE):$(TAG)
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@ -0,0 +1,48 @@
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upstream phpcgi {
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server wordpress-php:9000;
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}
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server {
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listen 80 ;
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root /var/www/html;
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index index.php index.html index.htm;
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server_name localhost;
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location / {
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try_files $uri $uri/ =404;
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}
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location ~ \.php$ {
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fastcgi_split_path_info ^(.+\.php)(/.+)$;
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# NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
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# With php5-cgi alone:
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fastcgi_pass phpcgi;
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# With php5-fpm:
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fastcgi_index index.php;
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fastcgi_param QUERY_STRING $query_string;
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fastcgi_param REQUEST_METHOD $request_method;
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fastcgi_param CONTENT_TYPE $content_type;
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fastcgi_param CONTENT_LENGTH $content_length;
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fastcgi_param SCRIPT_NAME $fastcgi_script_name;
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fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
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fastcgi_param REQUEST_URI $request_uri;
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fastcgi_param DOCUMENT_URI $document_uri;
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fastcgi_param DOCUMENT_ROOT $document_root;
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fastcgi_param SERVER_PROTOCOL $server_protocol;
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fastcgi_param GATEWAY_INTERFACE CGI/1.1;
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fastcgi_param SERVER_SOFTWARE nginx;
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fastcgi_param REMOTE_ADDR $remote_addr;
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fastcgi_param REMOTE_PORT $remote_port;
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fastcgi_param SERVER_ADDR $server_addr;
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fastcgi_param SERVER_PORT $server_port;
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fastcgi_param SERVER_NAME $server_name;
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#include fastcgi_params;
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}
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}
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@ -0,0 +1,11 @@
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resources:
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- name: nfs-disk
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type: compute.v1.disk
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properties:
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zone: us-central1-b
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sizeGb: 200
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- name: mysql-disk
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type: compute.v1.disk
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properties:
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zone: us-central1-b
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sizeGb: 200
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@ -0,0 +1,80 @@
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{% set PROJECT = properties['project'] or 'dm-k8s-testing' %}
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{% set NFS_SERVER = properties['nfs-server'] or {} %}
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{% set NFS_SERVER_IP = NFS_SERVER['ip'] or '10.0.253.247' %}
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{% set NFS_SERVER_PORT = NFS_SERVER['port'] or 2049 %}
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{% set NFS_SERVER_DISK = NFS_SERVER['disk'] or 'nfs-disk' %}
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{% set NFS_SERVER_DISK_FSTYPE = NFS_SERVER['fstype'] or 'ext4' %}
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{% set NGINX = properties['nginx'] or {} %}
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{% set NGINX_PORT = 80 %}
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{% set NGINX_REPLICAS = NGINX['replicas'] or 2 %}
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{% set WORDPRESS_PHP = properties['wordpress-php'] or {} %}
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{% set WORDPRESS_PHP_REPLICAS = WORDPRESS_PHP['replicas'] or 2 %}
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{% set WORDPRESS_PHP_PORT = WORDPRESS_PHP['port'] or 9000 %}
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{% set MYSQL = properties['mysql'] or {} %}
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{% set MYSQL_PORT = MYSQL['port'] or 3306 %}
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{% set MYSQL_PASSWORD = MYSQL['password'] or 'mysql-password' %}
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{% set MYSQL_DISK = MYSQL['disk'] or 'mysql-disk' %}
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{% set MYSQL_DISK_FSTYPE = MYSQL['fstype'] or 'ext4' %}
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imports:
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- path: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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resources:
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- name: nfs-server
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_port: {{ NFS_SERVER_PORT }}
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container_port: {{ NFS_SERVER_PORT }}
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replicas: 1 # Has to be 1 because of the persistent disk
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image: jsafrane/nfs-data
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privileged: true
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cluster_ip: {{ NFS_SERVER_IP }}
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volumes:
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- mount_path: /mnt/data
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gcePersistentDisk:
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pdName: {{ NFS_SERVER_DISK }}
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fsType: {{ NFS_SERVER_DISK_FSTYPE }}
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- name: nginx
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_port: {{ NGINX_PORT }}
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container_port: {{ NGINX_PORT }}
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replicas: {{ NGINX_REPLICAS }}
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external_service: true
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image: gcr.io/{{ PROJECT }}/nginx:latest
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volumes:
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- mount_path: /var/www/html
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nfs:
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server: {{ NFS_SERVER_IP }}
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path: /
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- name: mysql
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_port: {{ MYSQL_PORT }}
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container_port: {{ MYSQL_PORT }}
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replicas: 1
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image: mysql:5.6
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env:
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- name: MYSQL_ROOT_PASSWORD
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value: {{ MYSQL_PASSWORD }}
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volumes:
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- mount_path: /var/lib/mysql
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gcePersistentDisk:
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pdName: {{ MYSQL_DISK }}
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fsType: {{ MYSQL_DISK_FSTYPE }}
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- name: wordpress-php
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type: https://raw.githubusercontent.com/leendersr/deployment-manager/master/types/replicatedservice/v2/replicatedservice.py
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properties:
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service_name: wordpress-php
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service_port: {{ WORDPRESS_PHP_PORT }}
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container_port: {{ WORDPRESS_PHP_PORT }}
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replicas: 2
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image: wordpress:fpm
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env:
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- name: WORDPRESS_DB_PASSWORD
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value: {{ MYSQL_PASSWORD }}
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- name: WORDPRESS_DB_HOST
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value: mysql-service
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volumes:
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- mount_path: /var/www/html
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nfs:
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server: {{ NFS_SERVER_IP }}
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path: /
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@ -0,0 +1,69 @@
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info:
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title: Wordpress
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description: |
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Defines a Wordpress website by defining four replicatedservices: an NFS service, an NGINX service, an Wordpress-PHP service, and a MySQL service.
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The NGINX service and the Wordpress-fpm service both use NFS to share files.
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properties:
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project:
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type: string
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default: dm-k8s-testing
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description: Project location to load the images from.
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nfs-service:
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type: object
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properties:
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ip:
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type: string
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default: 10.0.253.247
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description: The IP of the NFS service.
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port:
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type: int
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default: 2049
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description: The port of the NFS service.
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disk:
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type: string
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default: nfs-disk
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description: The name of the persistent disk the NFS service uses.
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fstype:
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type: string
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default: ext4
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description: The filesystem the disk of the NFS service uses.
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nginx:
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type: object
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properties:
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replicas:
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type: int
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default: 2
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description: The number of replicas for the nginx service.
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wordpress-php:
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type: object
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properties:
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replicas:
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type: int
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default: 2
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description: The number of replicas for the wordpress-php service.
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port:
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type: int
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default: 9000
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description: The port the wordpress-php service runs on.
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mysql:
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type: object
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properties:
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port:
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type: int
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default: 3306
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description: The port the MySQL service runs on.
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password:
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type: string
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default: mysql-password
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description: The root password of the MySQL service.
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disk:
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type: string
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default: mysql-disk
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description: The name of the persistent disk the MySQL service uses.
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fstype:
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type: string
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default: ext4
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description: The filesystem the disk of the MySQL service uses.
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@ -0,0 +1,194 @@
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"""Defines a ReplicatedService type by creating both a Service and an RC.
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This module creates a typical abstraction for running a service in a
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Kubernetes cluster, namely a replication controller and a service packaged
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together into a single unit.
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"""
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import yaml
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SERVICE_TYPE_COLLECTION = 'Service'
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RC_TYPE_COLLECTION = 'ReplicationController'
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def GenerateConfig(context):
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"""Generates a Replication Controller and a matching Service.
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Args:
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context: Template context. See schema for context properties
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Returns:
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A Container Manifest as a YAML string.
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"""
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# YAML config that we're going to create for both RC & Service
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config = {'resources': []}
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name = context.env['name']
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container_name = context.properties.get('container_name', name)
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namespace = context.properties.get('namespace', 'default')
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# Define things that the Service cares about
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service_name = context.properties.get('service_name', name + '-service')
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service_type = SERVICE_TYPE_COLLECTION
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# Define things that the Replication Controller (rc) cares about
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rc_name = context.properties.get('rc_name', name + '-rc')
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rc_type = RC_TYPE_COLLECTION
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service = {
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'name': service_name,
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'type': service_type,
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'properties': {
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'apiVersion': 'v1',
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'kind': 'Service',
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'namespace': namespace,
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'metadata': {
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'name': service_name,
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'labels': GenerateLabels(context, service_name),
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},
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'spec': {
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'ports': [GenerateServicePorts(context, container_name)],
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'selector': GenerateLabels(context, name)
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}
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}
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}
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set_up_external_lb = context.properties.get('external_service', None)
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if set_up_external_lb:
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service['properties']['spec']['type'] = 'LoadBalancer'
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cluster_ip = context.properties.get('cluster_ip', None)
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if cluster_ip:
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service['properties']['spec']['clusterIP'] = cluster_ip
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config['resources'].append(service)
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rc = {
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'name': rc_name,
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'type': rc_type,
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'properties': {
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'apiVersion': 'v1',
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'kind': 'ReplicationController',
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'namespace': namespace,
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'metadata': {
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'name': rc_name,
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'labels': GenerateLabels(context, rc_name),
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},
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'spec': {
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'replicas': context.properties['replicas'],
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'selector': GenerateLabels(context, name),
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'template': {
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'metadata': {
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'labels': GenerateLabels(context, name),
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},
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'spec': {
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'containers': [
|
||||
{
|
||||
'env': GenerateEnv(context),
|
||||
'name': container_name,
|
||||
'image': context.properties['image'],
|
||||
'ports': [
|
||||
{
|
||||
'name': container_name,
|
||||
'containerPort': context.properties['container_port'],
|
||||
}
|
||||
],
|
||||
}
|
||||
],
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
# Set up volume mounts
|
||||
if context.properties.get('volumes', None):
|
||||
rc['properties']['spec']['template']['spec']['containers'][0]['volumeMounts'] = []
|
||||
rc['properties']['spec']['template']['spec']['volumes'] = []
|
||||
for volume in context.properties['volumes']:
|
||||
# mountPath should be unique
|
||||
volume_name = volume['mount_path'].replace('/', '-').lstrip('-') + '-storage'
|
||||
rc['properties']['spec']['template']['spec']['containers'][0]['volumeMounts'].append(
|
||||
{
|
||||
'name': volume_name,
|
||||
'mountPath': volume['mount_path']
|
||||
}
|
||||
)
|
||||
del volume['mount_path']
|
||||
volume['name'] = volume_name
|
||||
rc['properties']['spec']['template']['spec']['volumes'].append(volume)
|
||||
|
||||
if context.properties.get('privileged', False):
|
||||
rc['properties']['spec']['template']['spec']['containers'][0]['securityContext'] = {
|
||||
'privileged': True
|
||||
}
|
||||
|
||||
config['resources'].append(rc)
|
||||
return yaml.dump(config)
|
||||
|
||||
|
||||
# Generates labels either from the context.properties['labels'] or generates
|
||||
# a default label 'name':name
|
||||
def GenerateLabels(context, name):
|
||||
"""Generates labels from context.properties['labels'] or creates default.
|
||||
|
||||
We make a deep copy of the context.properties['labels'] section to avoid
|
||||
linking in the yaml document, which I believe reduces readability of the
|
||||
expanded template. If no labels are given, generate a default 'name':name.
|
||||
|
||||
Args:
|
||||
context: Template context, which can contain the following properties:
|
||||
labels - Labels to generate
|
||||
|
||||
Returns:
|
||||
A dict containing labels in a name:value format
|
||||
"""
|
||||
tmp_labels = context.properties.get('labels', None)
|
||||
ret_labels = {'name': name}
|
||||
if isinstance(tmp_labels, dict):
|
||||
for key, value in tmp_labels.iteritems():
|
||||
ret_labels[key] = value
|
||||
return ret_labels
|
||||
|
||||
|
||||
def GenerateServicePorts(context, name):
|
||||
"""Generates a ports section for a service.
|
||||
|
||||
Args:
|
||||
context: Template context, which can contain the following properties:
|
||||
service_port - Port to use for the service
|
||||
target_port - Target port for the service
|
||||
protocol - Protocol to use.
|
||||
|
||||
Returns:
|
||||
A dict containing a port definition
|
||||
"""
|
||||
service_port = context.properties.get('service_port', None)
|
||||
target_port = context.properties.get('target_port', None)
|
||||
protocol = context.properties.get('protocol')
|
||||
|
||||
ports = {}
|
||||
if name:
|
||||
ports['name'] = name
|
||||
if service_port:
|
||||
ports['port'] = service_port
|
||||
if target_port:
|
||||
ports['targetPort'] = target_port
|
||||
if protocol:
|
||||
ports['protocol'] = protocol
|
||||
|
||||
return ports
|
||||
|
||||
def GenerateEnv(context):
|
||||
"""Generates environmental variables for a pod.
|
||||
|
||||
Args:
|
||||
context: Template context, which can contain the following properties:
|
||||
env - Environment variables to set.
|
||||
|
||||
Returns:
|
||||
A list containing env variables in dict format {name: 'name', value: 'value'}
|
||||
"""
|
||||
env = []
|
||||
tmp_env = context.properties.get('env', [])
|
||||
for entry in tmp_env:
|
||||
if isinstance(entry, dict):
|
||||
env.append({'name': entry.get('name'), 'value': entry.get('value')})
|
||||
return env
|
||||
@ -0,0 +1,91 @@
|
||||
info:
|
||||
title: Replicated Service
|
||||
description: |
|
||||
Defines a ReplicatedService type by creating both a Service and an RC.
|
||||
|
||||
This module creates a typical abstraction for running a service in a
|
||||
Kubernetes cluster, namely a replication controller and a service packaged
|
||||
together into a single unit.
|
||||
|
||||
required:
|
||||
- image
|
||||
|
||||
properties:
|
||||
container_name:
|
||||
type: string
|
||||
description: Name to use for container. If omitted, name is used.
|
||||
service_name:
|
||||
type: string
|
||||
description: Name to use for service. If omitted, name-service is used.
|
||||
namespace:
|
||||
type: string
|
||||
description: Namespace to create resources in. If omitted, 'default' is
|
||||
used.
|
||||
default: default
|
||||
protocol:
|
||||
type: string
|
||||
description: Protocol to use for the service.
|
||||
service_port:
|
||||
type: int
|
||||
description: Port to use for the service.
|
||||
target_port:
|
||||
type: int
|
||||
description: Target port to use for the service.
|
||||
container_port:
|
||||
type: int
|
||||
description: Port to use for the container.
|
||||
replicas:
|
||||
type: int
|
||||
description: Number of replicas to create in RC.
|
||||
image:
|
||||
type: string
|
||||
description: Docker image to use for replicas.
|
||||
labels:
|
||||
type: object
|
||||
description: Labels to apply.
|
||||
env:
|
||||
type: array
|
||||
description: Environment variables to apply.
|
||||
properties:
|
||||
name:
|
||||
type: string
|
||||
value:
|
||||
type: string
|
||||
external_service:
|
||||
type: boolean
|
||||
description: If set to true, enable external load balancer.
|
||||
cluster_ip:
|
||||
type: string
|
||||
description: IP to use for the service
|
||||
privileged:
|
||||
type: boolean
|
||||
description: If set to true, enable privileged container
|
||||
volumes:
|
||||
type: array
|
||||
description: Volumes to mount.
|
||||
items:
|
||||
type: object
|
||||
properties:
|
||||
mounth_path:
|
||||
type: string
|
||||
description: Path to mount volume
|
||||
# See https://cloud.google.com/container-engine/docs/spec-schema?hl=en for possible volumes. Since we only use gcePersistentDisk and NFS in our examples we have only added these ones.
|
||||
oneOf:
|
||||
gcePersistentDisk:
|
||||
pdName:
|
||||
type: string
|
||||
description: Persistent's disk name
|
||||
fsType:
|
||||
type: string
|
||||
description: Filesystem type of the persistent disk
|
||||
nfs:
|
||||
server:
|
||||
type: string
|
||||
description: The hostname or IP address of the NFS server
|
||||
path:
|
||||
type: string
|
||||
description: The path that is exported by the NFS server
|
||||
readOnly:
|
||||
type: boolean
|
||||
description: Forces the NFS export to be mounted with read-only permissions
|
||||
|
||||
Loading…
Reference in new issue