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Merge pull request #7864 from caesarxuchao/wordpress-example 

update mysql-wordpress example to use v1beta3 API
pull/6/head
Nikhil Jindal 2015-05-07 11:41:53 -07:00
parent a1c305c390 284cd205d2
commit c41982dac5
9 changed files with 169 additions and 288 deletions
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187
examples/mysql-wordpress-pd/README.md
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@ -22,7 +22,13 @@ Then, set the gcloud default project name to point to the project you want to us
gcloud config set project <project-name>
```
Next, grab the Kubernetes [release binary](https://github.com/GoogleCloudPlatform/kubernetes/releases). You can do this via:
Next, grab the Kubernetes [release binary](https://github.com/GoogleCloudPlatform/kubernetes/releases) and start up a Kubernetes cluster:
```
$ <kubernetes>/cluster/kube-up.sh
```
where `<kubernetes>` is the path to your Kubernetes installation.
Or, as [described here](http://docs.k8s.io/getting-started-guides/gce.md), you can do this via:
```shell
wget -q -O - https://get.k8s.io | bash
```
@ -31,14 +37,6 @@ or
curl -sS https://get.k8s.io | bash
```
Then, start up a Kubernetes cluster as [described here](http://docs.k8s.io/getting-started-guides/gce.md).
```
$ <kubernetes>/cluster/kube-up.sh
```
where `<kubernetes>` is the path to your Kubernetes installation.
## Create two persistent disks
For this WordPress installation, we're going to configure our Kubernetes [pods](http://docs.k8s.io/pods.md) to use [persistent disks](https://cloud.google.com/compute/docs/disks). This means that we can preserve installation state across pod shutdown and re-startup.
@ -69,37 +67,38 @@ First, **edit `mysql.yaml`**, the mysql pod definition, to use a database passwo
`mysql.yaml` looks like this:
```yaml
apiVersion: v1beta1
id: mysql
desiredState:
manifest:
version: v1beta1
id: mysql
containers:
- name: mysql
image: mysql
env:
- name: MYSQL_ROOT_PASSWORD
# change this
value: yourpassword
cpu: 100
ports:
- containerPort: 3306
volumeMounts:
# name must match the volume name below
- name: mysql-persistent-storage
# mount path within the container
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
source:
persistentDisk:
# This GCE PD must already exist
pdName: mysql-disk
fsType: ext4
labels:
name: mysql
apiVersion: v1beta3
kind: Pod
metadata:
name: mysql
labels:
name: mysql
spec:
containers:
- resources:
limits :
cpu: 1
image: mysql
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
# change this
value: yourpassword
ports:
- containerPort: 3306
name: mysql
volumeMounts:
# name must match the volume name below
- name: mysql-persistent-storage
# mount path within the container
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
gcePersistentDisk:
# This GCE PD must already exist.
pdName: mysql-disk
fsType: ext4
```
Note that we've defined a volume mount for `/var/lib/mysql`, and specified a volume that uses the persistent disk (`mysql-disk`) that you created.
@ -130,28 +129,26 @@ If you want to do deeper troubleshooting, e.g. if it seems a container is not st
### Start the Mysql service
We'll define and start a [service](http://docs.k8s.io/services.md) that lets other pods access the mysql database on a known port and host.
We will specifically name the service `mysql`. This will let us leverage the support for [Docker-links-compatible](http://docs.k8s.io/services.md#how-do-they-work) service environment variables when we up the wordpress pod. The wordpress Docker image expects to be linked to a mysql container named `mysql`, as you can see in the "How to use this image" section on the wordpress docker hub [page](https://registry.hub.docker.com/_/wordpress/).
We will specifically name the service `mysql`. This will let us leverage the support for [Docker-links-compatible](http://docs.k8s.io/services.md#how-do-they-work) service environment variables when we set up the wordpress pod. The wordpress Docker image expects to be linked to a mysql container named `mysql`, as you can see in the "How to use this image" section on the wordpress docker hub [page](https://registry.hub.docker.com/_/wordpress/).
So if we label our Kubernetes mysql service `mysql`, the wordpress pod will be able to use the Docker-links-compatible environment variables, defined by Kubernetes, to connect to the database.
The `mysql-service.yaml` file looks like this:
```yaml
apiVersion: v1beta3
kind: Service
apiVersion: v1beta1
id: mysql
# the port that this service should serve on
port: 3306
# just like the selector in the replication controller,
# but this time it identifies the set of pods to load balance
# traffic to.
selector:
name: mysql
# the container on each pod to connect to, can be a name
# (e.g. 'www') or a number (e.g. 80)
containerPort: 3306
labels:
metadata:
labels:
name: mysql
name: mysql
spec:
ports:
# the port that this service should serve on
- port: 3306
# label keys and values that must match in order to receive traffic for this service
selector:
name: mysql
```
Start the service like this:
@ -174,37 +171,34 @@ Once the mysql service is up, start the wordpress pod, specified in
Note that this config file also defines a volume, this one using the `wordpress-disk` persistent disk that you created.
```yaml
apiVersion: v1beta1
id: wordpress
desiredState:
manifest:
version: v1beta1
id: frontendController
containers:
- name: wordpress
image: wordpress
ports:
- containerPort: 80
volumeMounts:
# name must match the volume name below
- name: wordpress-persistent-storage
# mount path within the container
mountPath: /var/www/html
env:
- name: WORDPRESS_DB_PASSWORD
# change this - must match mysql.yaml password
value: yourpassword
volumes:
- name: wordpress-persistent-storage
source:
# emptyDir: {}
persistentDisk:
# This GCE PD must already exist
pdName: wordpress-disk
fsType: ext4
labels:
name: wpfrontend
apiVersion: v1beta3
kind: Pod
metadata:
name: wordpress
labels:
name: wordpress
spec:
containers:
- image: wordpress
name: wordpress
env:
- name: WORDPRESS_DB_PASSWORD
# change this - must match mysql.yaml password
value: yourpassword
ports:
- containerPort: 80
name: wordpress
volumeMounts:
# name must match the volume name below
- name: wordpress-persistent-storage
# mount path within the container
mountPath: /var/www/html
volumes:
- name: wordpress-persistent-storage
gcePersistentDisk:
# This GCE PD must already exist.
pdName: wordpress-disk
fsType: ext4
```
Create the pod:
@ -227,26 +221,23 @@ Once the wordpress pod is running, start its service, specified by `wordpress-se
The service config file looks like this:
```yaml
apiVersion: v1beta3
kind: Service
apiVersion: v1beta1
id: wpfrontend
# the port that this service should serve on.
port: 80
# just like the selector in the replication controller,
# but this time it identifies the set of pods to load balance
# traffic to.
selector:
metadata:
labels:
name: wpfrontend
name: wpfrontend
# the container on each pod to connect to, can be a name
# (e.g. 'www') or a number (e.g. 80)
containerPort: 80
labels:
name: wpfrontend
createExternalLoadBalancer: true
spec:
createExternalLoadBalancer: true
ports:
# the port that this service should serve on
- port: 80
# label keys and values that must match in order to receive traffic for this service
selector:
name: wordpress
```
Note the `createExternalLoadBalancer` setting. This will set up the wordpress service behind an external IP.
`createExternalLoadBalancer` only works on GCE.
Note also that we've set the service port to 80. We'll return to that shortly.
Start the service:

24
examples/mysql-wordpress-pd/mysql-service.yaml
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@ -1,15 +1,13 @@
apiVersion: v1beta3
kind: Service
apiVersion: v1beta1
id: mysql
# the port that this service should serve on
port: 3306
# just like the selector in the replication controller,
# but this time it identifies the set of pods to load balance
# traffic to.
selector:
name: mysql
# the container on each pod to connect to, can be a name
# (e.g. 'www') or a number (e.g. 80)
containerPort: 3306
labels:
metadata:
labels:
name: mysql
name: mysql
spec:
ports:
# the port that this service should serve on
- port: 3306
# label keys and values that must match in order to receive traffic for this service
selector:
name: mysql

61
examples/mysql-wordpress-pd/mysql.yaml
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@ -1,32 +1,31 @@
apiVersion: v1beta1
id: mysql
desiredState:
manifest:
version: v1beta1
id: mysql
containers:
- name: mysql
image: mysql
env:
- name: MYSQL_ROOT_PASSWORD
# change this
value: yourpassword
cpu: 100
ports:
- containerPort: 3306
volumeMounts:
# name must match the volume name below
- name: mysql-persistent-storage
# mount path within the container
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
source:
# emptyDir: {}
persistentDisk:
# This GCE PD must already exist.
pdName: mysql-disk
fsType: ext4
labels:
name: mysql
apiVersion: v1beta3
kind: Pod
metadata:
name: mysql
labels:
name: mysql
spec:
containers:
- resources:
limits :
cpu: 1
image: mysql
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
# change this
value: yourpassword
ports:
- containerPort: 3306
name: mysql
volumeMounts:
# name must match the volume name below
- name: mysql-persistent-storage
# mount path within the container
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
gcePersistentDisk:
# This GCE PD must already exist.
pdName: mysql-disk
fsType: ext4

13
examples/mysql-wordpress-pd/v1beta3/mysql-service.yaml
View File

@ -1,13 +0,0 @@
apiVersion: v1beta3
kind: Service
metadata:
labels:
name: mysql
name: mysql
spec:
ports:
- port: 3306
targetPort: 3306
selector:
name: mysql

40
examples/mysql-wordpress-pd/v1beta3/mysql.yaml
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@ -1,40 +0,0 @@
apiVersion: v1beta3
kind: ReplicationController
metadata:
labels:
name: mysql
name: mysql
spec:
replicas: 1
selector:
name: mysql
template:
metadata:
labels:
name: mysql
spec:
containers:
- resources:
limits :
cpu: 1
image: mysql
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
# change this
value: yourpassword
ports:
- containerPort: 3306
name: mysql
volumeMounts:
# name must match the volume name below
- name: mysql-persistent-storage
# mount path within the container
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
gcePersistentDisk:
# This GCE PD must already exist.
pdName: mysql-disk
fsType: ext4

13
examples/mysql-wordpress-pd/v1beta3/wordpress-service.yaml
View File

@ -1,13 +0,0 @@
apiVersion: v1beta3
kind: Service
metadata:
labels:
name: wpfrontend
name: wpfrontend
spec:
ports:
- port: 80
targetPort: 80
selector:
name: wpfrontend

37
examples/mysql-wordpress-pd/v1beta3/wordpress.yaml
View File

@ -1,37 +0,0 @@
apiVersion: v1beta3
kind: ReplicationController
metadata:
labels:
name: wordpress
name: wordpress
spec:
replicas: 1
selector:
name: wordpress
template:
metadata:
labels:
name: wordpress
spec:
containers:
- image: wordpress
name: wordpress
env:
- name: WORDPRESS_DB_PASSWORD
# change this - must match mysql.yaml password
value: yourpassword
ports:
- containerPort: 80
name: wordpress
volumeMounts:
# name must match the volume name below
- name: wordpress-persistent-storage
# mount path within the container
mountPath: /var/www/html
volumes:
- name: wordpress-persistent-storage
gcePersistentDisk:
# This GCE PD must already exist.
pdName: wordpress-disk
fsType: ext4

25
examples/mysql-wordpress-pd/wordpress-service.yaml
View File

@ -1,15 +1,14 @@
apiVersion: v1beta3
kind: Service
apiVersion: v1beta1
id: wpfrontend
# the port that this service should serve on
port: 80
# identifies the set of pods to load balance
# traffic to.
selector:
metadata:
labels:
name: wpfrontend
name: wpfrontend
# the container on each pod to connect to, can be a name
# (e.g. 'www') or a number (e.g. 80)
containerPort: 80
labels:
name: wpfrontend
createExternalLoadBalancer: true
spec:
createExternalLoadBalancer: true
ports:
# the port that this service should serve on
- port: 80
# label keys and values that must match in order to receive traffic for this service
selector:
name: wordpress

57
examples/mysql-wordpress-pd/wordpress.yaml
View File

@ -1,31 +1,28 @@
apiVersion: v1beta1
id: wordpress
desiredState:
manifest:
version: v1beta1
id: wordpress
containers:
- name: wordpress
image: wordpress
ports:
- containerPort: 80
volumeMounts:
# name must match the volume name below
- name: wordpress-persistent-storage
# mount path within the container
mountPath: /var/www/html
env:
- name: WORDPRESS_DB_PASSWORD
# change this - must match mysql.yaml password
value: yourpassword
volumes:
- name: wordpress-persistent-storage
source:
# emptyDir: {}
persistentDisk:
# This GCE PD must already exist.
pdName: wordpress-disk
fsType: ext4
labels:
name: wpfrontend
apiVersion: v1beta3
kind: Pod
metadata:
name: wordpress
labels:
name: wordpress
spec:
containers:
- image: wordpress
name: wordpress
env:
- name: WORDPRESS_DB_PASSWORD
# change this - must match mysql.yaml password
value: yourpassword
ports:
- containerPort: 80
name: wordpress
volumeMounts:
# name must match the volume name below
- name: wordpress-persistent-storage
# mount path within the container
mountPath: /var/www/html
volumes:
- name: wordpress-persistent-storage
gcePersistentDisk:
# This GCE PD must already exist.
pdName: wordpress-disk
fsType: ext4