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Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
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Mrunal Patel 2017-01-31 16:45:59 -08:00
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## Phabricator example
This example shows how to build a simple multi-tier web application using Kubernetes and Docker.
The example combines a web frontend and an external service that provides MySQL database. We use CloudSQL on Google Cloud Platform in this example, but in principle any approach to running MySQL should work.
### Step Zero: Prerequisites
This example assumes that you have a basic understanding of kubernetes [services](../../docs/user-guide/services.md) and that you have forked the repository and [turned up a Kubernetes cluster](../../docs/getting-started-guides/):
```sh
$ cd kubernetes
$ cluster/kube-up.sh
```
### Step One: Set up Cloud SQL instance
Follow the [official instructions](https://cloud.google.com/sql/docs/getting-started) to set up Cloud SQL instance.
In the remaining part of this example we will assume that your instance is named "phabricator-db", has IP 1.2.3.4, is listening on port 3306 and the password is "1234".
### Step Two: Authenticate phabricator in Cloud SQL
In order to allow phabricator to connect to your Cloud SQL instance you need to run the following command to authorize all your nodes within a cluster:
```bash
NODE_NAMES=`kubectl get nodes | cut -d" " -f1 | tail -n+2`
NODE_IPS=`gcloud compute instances list $NODE_NAMES | tr -s " " | cut -d" " -f 5 | tail -n+2`
gcloud sql instances patch phabricator-db --authorized-networks $NODE_IPS
```
Otherwise you will see the following logs:
```bash
$ kubectl logs phabricator-controller-02qp4
[...]
Raw MySQL Error: Attempt to connect to root@1.2.3.4 failed with error
#2013: Lost connection to MySQL server at 'reading initial communication packet', system error: 0.
```
### Step Three: Turn up the phabricator
To start Phabricator server use the file [`examples/phabricator/phabricator-controller.json`](phabricator-controller.json) which describes a [replication controller](../../docs/user-guide/replication-controller.md) with a single [pod](../../docs/user-guide/pods.md) running an Apache server with Phabricator PHP source:
<!-- BEGIN MUNGE: EXAMPLE phabricator-controller.json -->
```json
{
"kind": "ReplicationController",
"apiVersion": "v1",
"metadata": {
"name": "phabricator-controller",
"labels": {
"name": "phabricator"
}
},
"spec": {
"replicas": 1,
"selector": {
"name": "phabricator"
},
"template": {
"metadata": {
"labels": {
"name": "phabricator"
}
},
"spec": {
"containers": [
{
"name": "phabricator",
"image": "fgrzadkowski/example-php-phabricator",
"ports": [
{
"name": "http-server",
"containerPort": 80
}
],
"env": [
{
"name": "MYSQL_SERVICE_IP",
"value": "1.2.3.4"
},
{
"name": "MYSQL_SERVICE_PORT",
"value": "3306"
},
{
"name": "MYSQL_PASSWORD",
"value": "1234"
}
]
}
]
}
}
}
}
```
[Download example](phabricator-controller.json?raw=true)
<!-- END MUNGE: EXAMPLE phabricator-controller.json -->
Create the phabricator pod in your Kubernetes cluster by running:
```sh
$ kubectl create -f examples/phabricator/phabricator-controller.json
```
**Note:** Remember to substitute environment variable values in json file before create replication controller.
Once that's up you can list the pods in the cluster, to verify that it is running:
```sh
kubectl get pods
```
You'll see a single phabricator pod. It will also display the machine that the pod is running on once it gets placed (may take up to thirty seconds):
```
NAME READY STATUS RESTARTS AGE
phabricator-controller-9vy68 1/1 Running 0 1m
```
If you ssh to that machine, you can run `docker ps` to see the actual pod:
```sh
me@workstation$ gcloud compute ssh --zone us-central1-b kubernetes-node-2
$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
54983bc33494 fgrzadkowski/phabricator:latest "/run.sh" 2 hours ago Up 2 hours k8s_phabricator.d6b45054_phabricator-controller-02qp4.default.api_eafb1e53-b6a9-11e4-b1ae-42010af05ea6_01c2c4ca
```
(Note that initial `docker pull` may take a few minutes, depending on network conditions. During this time, the `get pods` command will return `Pending` because the container has not yet started )
### Step Four: Turn up the phabricator service
A Kubernetes 'service' is a named load balancer that proxies traffic to one or more containers. The services in a Kubernetes cluster are discoverable inside other containers via *environment variables*. Services find the containers to load balance based on pod labels. These environment variables are typically referenced in application code, shell scripts, or other places where one node needs to talk to another in a distributed system. You should catch up on [kubernetes services](../../docs/user-guide/services.md) before proceeding.
The pod that you created in Step Three has the label `name=phabricator`. The selector field of the service determines which pods will receive the traffic sent to the service.
Use the file [`examples/phabricator/phabricator-service.json`](phabricator-service.json):
<!-- BEGIN MUNGE: EXAMPLE phabricator-service.json -->
```json
{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "phabricator"
},
"spec": {
"ports": [
{
"port": 80,
"targetPort": "http-server"
}
],
"selector": {
"name": "phabricator"
},
"type": "LoadBalancer"
}
}
```
[Download example](phabricator-service.json?raw=true)
<!-- END MUNGE: EXAMPLE phabricator-service.json -->
To create the service run:
```sh
$ kubectl create -f examples/phabricator/phabricator-service.json
phabricator
```
To play with the service itself, find the external IP of the load balancer:
```console
$ kubectl get services
NAME LABELS SELECTOR IP(S) PORT(S)
kubernetes component=apiserver,provider=kubernetes <none> 10.0.0.1 443/TCP
phabricator <none> name=phabricator 10.0.31.173 80/TCP
$ kubectl get services phabricator -o json | grep ingress -A 4
"ingress": [
{
"ip": "104.197.13.125"
}
]
```
and then visit port 80 of that IP address.
**Note**: Provisioning of the external IP address may take few minutes.
**Note**: You may need to open the firewall for port 80 using the [console][cloud-console] or the `gcloud` tool. The following command will allow traffic from any source to instances tagged `kubernetes-node`:
```sh
$ gcloud compute firewall-rules create phabricator-node-80 --allow=tcp:80 --target-tags kubernetes-node
```
### Step Six: Cleanup
To turn down a Kubernetes cluster:
```sh
$ cluster/kube-down.sh
```
<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/examples/phabricator/README.md?pixel)]()
<!-- END MUNGE: GENERATED_ANALYTICS -->

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{
"kind": "ReplicationController",
"apiVersion": "v1",
"metadata": {
"name": "phabricator-controller",
"labels": {
"name": "phabricator"
}
},
"spec": {
"replicas": 1,
"selector": {
"name": "phabricator"
},
"template": {
"metadata": {
"labels": {
"name": "phabricator"
}
},
"spec": {
"containers": [
{
"name": "phabricator",
"image": "fgrzadkowski/example-php-phabricator",
"ports": [
{
"name": "http-server",
"containerPort": 80
}
],
"env": [
{
"name": "MYSQL_SERVICE_IP",
"value": "1.2.3.4"
},
{
"name": "MYSQL_SERVICE_PORT",
"value": "3306"
},
{
"name": "MYSQL_PASSWORD",
"value": "1234"
}
]
}
]
}
}
}
}

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{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "phabricator"
},
"spec": {
"ports": [
{
"port": 80,
"targetPort": "http-server"
}
],
"selector": {
"name": "phabricator"
},
"type": "LoadBalancer"
}
}

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<Directory /home/www-data/phabricator/webroot>
Require all granted
</Directory>
<VirtualHost *>
DocumentRoot /home/www-data/phabricator/webroot
RewriteEngine on
RewriteRule ^/rsrc/(.*) - [L,QSA]
RewriteRule ^/favicon.ico - [L,QSA]
RewriteRule ^(.*)$ /index.php?__path__=$1 [B,L,QSA]
</VirtualHost>

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# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
FROM ubuntu:14.04
# Install all the required packages.
RUN apt-get update
RUN apt-get -y install \
git apache2 dpkg-dev python-pygments \
php5 php5-mysql php5-gd php5-dev php5-curl php-apc php5-cli php5-json php5-xhprof
RUN a2enmod rewrite
RUN apt-get source php5
RUN (cd `ls -1F | grep '^php5-.*/$'`/ext/pcntl && phpize && ./configure && make && sudo make install)
# Load code source.
RUN mkdir /home/www-data
RUN cd /home/www-data && git clone https://github.com/phacility/libphutil.git
RUN cd /home/www-data && git clone https://github.com/phacility/arcanist.git
RUN cd /home/www-data && git clone https://github.com/phacility/phabricator.git
RUN chown -R www-data /home/www-data
RUN chgrp -R www-data /home/www-data
ADD 000-default.conf /etc/apache2/sites-available/000-default.conf
ADD run.sh /run.sh
RUN chmod a+x /*.sh
# Run Apache2.
EXPOSE 80
CMD ["/run.sh"]

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#!/bin/bash
# Copyright 2015 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
echo "MySQL host IP ${MYSQL_SERVICE_IP} port ${MYSQL_SERVICE_PORT}."
/home/www-data/phabricator/bin/config set mysql.host $MYSQL_SERVICE_IP
/home/www-data/phabricator/bin/config set mysql.port $MYSQL_SERVICE_PORT
/home/www-data/phabricator/bin/config set mysql.pass $MYSQL_PASSWORD
echo "Running storage upgrade"
/home/www-data/phabricator/bin/storage --force upgrade || exit 1
source /etc/apache2/envvars
echo "Starting Apache2"
apache2 -D FOREGROUND

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#!/bin/bash
# Copyright 2015 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
echo "Create Phabricator replication controller" && kubectl create -f phabricator-controller.json
echo "Create Phabricator service" && kubectl create -f phabricator-service.json
echo "Create firewall rule" && gcloud compute firewall-rules create phabricator-node-80 --allow=tcp:80 --target-tags kubernetes-node

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#!/bin/bash
# Copyright 2015 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
echo "Deleting Phabricator service" && kubectl delete -f phabricator-service.json
echo "Deleting Phabricator replication controller" && kubectl delete rc phabricator-controller
echo "Delete firewall rule" && gcloud compute firewall-rules delete -q phabricator-node-80