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Update README to match with json files and remove duplicate index.php

pull/6/head
Alen Komljen 2014-11-20 21:00:58 +01:00 committed by Alen Komljen
parent 16ea5a0dd0
commit d7ffc5e8f0
2 changed files with 66 additions and 89 deletions
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94
examples/guestbook/README.md
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@ -13,24 +13,26 @@ $ cd kubernetes
$ hack/dev-build-and-up.sh $ hack/dev-build-and-up.sh
``` ```
### Step One: Turn up the redis master. ### Step One: Turn up the redis master
Use the file `examples/guestbook/redis-master.json` which describes a single pod running a redis key-value server in a container. Use the file `examples/guestbook/redis-master.json` which describes a single pod running a redis key-value server in a container:
```javascript ```js
{ {
"id": "redis-master-2", "id": "redis-master",
"kind": "Pod", "kind": "Pod",
"apiVersion": "v1beta1", "apiVersion": "v1beta1",
"desiredState": { "desiredState": {
"manifest": { "manifest": {
"version": "v1beta1", "version": "v1beta1",
"id": "redis-master-2", "id": "redis-master",
"containers": [{ "containers": [{
"name": "master", "name": "master",
"image": "dockerfile/redis", "image": "dockerfile/redis",
"cpu": 100,
"ports": [{ "ports": [{
"containerPort": 6379, "containerPort": 6379,
"hostPort": 6379
}] }]
}] }]
} }
@ -41,7 +43,7 @@ Use the file `examples/guestbook/redis-master.json` which describes a single pod
} }
``` ```
Create the redis pod in your Kubernetes cluster using the `kubecfg` CLI: Create the redis pod in your Kubernetes cluster by running:
```shell ```shell
$ cluster/kubecfg.sh -c examples/guestbook/redis-master.json create pods $ cluster/kubecfg.sh -c examples/guestbook/redis-master.json create pods
@ -53,12 +55,12 @@ Once that's up you can list the pods in the cluster, to verify that the master i
cluster/kubecfg.sh list pods cluster/kubecfg.sh list pods
``` ```
You'll see a single redis master pod. It will also display the machine that the pod is running on once it gets placed (may take up to thirty seconds). You'll see a single redis master pod. It will also display the machine that the pod is running on once it gets placed (may take up to thirty seconds):
``` ```
ID Image(s) Host Labels Status ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
redis-master-2 dockerfile/redis kubernetes-minion-3.c.briandpe-api.internal name=redis-master Running redis-master dockerfile/redis kubernetes-minion-3.c.briandpe-api.internal name=redis-master Running
``` ```
If you ssh to that machine, you can run `docker ps` to see the actual pod: If you ssh to that machine, you can run `docker ps` to see the actual pod:
@ -69,46 +71,49 @@ $ sudo docker ps
me@kubernetes-minion-3:~$ sudo docker ps me@kubernetes-minion-3:~$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
417ab993cdf8 dockerfile/redis:latest redis-server /etc/re 8 minutes ago Up 8 minutes 0.0.0.0:6379->6379/tcp master--redis_-_master_-_2--6b944b49 e3eed3e5e6d1 dockerfile/redis:latest redis-server /etc/re 8 minutes ago Up 8 minutes k8s_master.9c0a9146_redis-master.etcd_6296f4bd-70fa-11e4-8469-0800279696e1_45331ebc
``` ```
(Note that initial `docker pull` may take a few minutes, depending on network conditions.) (Note that initial `docker pull` may take a few minutes, depending on network conditions.)
### Step Two: Turn up the master service. ### Step Two: Turn up the master 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. 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.
The pod that you created in Step One has the label `name=redis-master`. The selector field of the service determines which pods will receive the traffic sent to the service. Use the file `examples/guestbook/redis-master-service.json` The pod that you created in Step One has the label `name=redis-master`. The selector field of the service determines which pods will receive the traffic sent to the service. Use the file `examples/guestbook/redis-master-service.json`:
```js ```js
{ {
"id": "redismaster", "id": "redis-master",
"kind": "Service", "kind": "Service",
"apiVersion": "v1beta1", "apiVersion": "v1beta1",
"port": 6379, "port": 6379,
"containerPort": 6379, "containerPort": 6379,
"selector": { "selector": {
"name": "redis-master" "name": "redis-master"
},
"labels": {
"name": "redis-master"
} }
} }
``` ```
to create the service with the `kubecfg` cli: to create the service by running:
```shell ```shell
$ cluster/kubecfg.sh -c examples/guestbook/redis-master-service.json create services $ cluster/kubecfg.sh -c examples/guestbook/redis-master-service.json create services
ID Labels Selector Port ID Labels Selector Port
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
redismaster name=redis-master 6379 redis-master name=redis-master name=redis-master 6379
``` ```
This will cause all pods to see the redis master apparently running on <ip>:6379. This will cause all pods to see the redis master apparently running on <ip>:6379.
Once created, the service proxy on each minion is configured to set up a proxy on the specified port (in this case port 6379). Once created, the service proxy on each minion is configured to set up a proxy on the specified port (in this case port 6379).
### Step Three: Turn up the replicated slave pods. ### Step Three: Turn up the replicated slave pods
Although the redis master is a single pod, the redis read slaves are a 'replicated' pod. In Kubernetes, a replication controller is responsible for managing multiple instances of a replicated pod. Although the redis master is a single pod, the redis read slaves are a 'replicated' pod. In Kubernetes, a replication controller is responsible for managing multiple instances of a replicated pod.
Use the file `examples/guestbook/redis-slave-controller.json` Use the file `examples/guestbook/redis-slave-controller.json`:
```js ```js
{ {
@ -126,11 +131,15 @@ Use the file `examples/guestbook/redis-slave-controller.json`
"containers": [{ "containers": [{
"name": "slave", "name": "slave",
"image": "brendanburns/redis-slave", "image": "brendanburns/redis-slave",
"ports": [{"containerPort": 6379}] "cpu": 200,
"ports": [{"containerPort": 6379, "hostPort": 6380}]
}] }]
} }
}, },
"labels": {"name": "redisslave"} "labels": {
"name": "redisslave",
"uses": "redis-master",
}
}}, }},
"labels": {"name": "redisslave"} "labels": {"name": "redisslave"}
} }
@ -148,7 +157,7 @@ redisSlaveController brendanburns/redis-slave name=redisslave 2
The redis slave configures itself by looking for the Kubernetes service environment variables in the container environment. In particular, the redis slave is started with the following command: The redis slave configures itself by looking for the Kubernetes service environment variables in the container environment. In particular, the redis slave is started with the following command:
```shell ```shell
redis-server --slaveof ${REDISMASTER_SERVICE_HOST:-$SERVICE_HOST} $REDISMASTER_SERVICE_PORT redis-server --slaveof ${REDIS_MASTER_SERVICE_HOST:-$SERVICE_HOST} $REDIS_MASTER_SERVICE_PORT
``` ```
Once that's up you can list the pods in the cluster, to verify that the master and slaves are running: Once that's up you can list the pods in the cluster, to verify that the master and slaves are running:
@ -157,16 +166,16 @@ Once that's up you can list the pods in the cluster, to verify that the master a
$ cluster/kubecfg.sh list pods $ cluster/kubecfg.sh list pods
ID Image(s) Host Labels Status ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
redis-master-2 dockerfile/redis kubernetes-minion-3.c.briandpe-api.internal name=redis-master Running redis-master dockerfile/redis kubernetes-minion-3.c.briandpe-api.internal name=redis-master Running
4d65822107fcfd52 brendanburns/redis-slave kubernetes-minion-3.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController Running e4469b52-70e7-11e4-9154-0800279696e1 brendanburns/redis-slave kubernetes-minion-3.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController,uses=redis-master Running
78629a0f5f3f164f brendanburns/redis-slave kubernetes-minion-4.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController Running e446dfc0-70e7-11e4-9154-0800279696e1 brendanburns/redis-slave kubernetes-minion-4.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController,uses=redis-master Running
``` ```
You will see a single redis master pod and two redis slave pods. You will see a single redis master pod and two redis slave pods.
### Step Four: Create the redis slave service. ### Step Four: Create the redis slave service
Just like the master, we want to have a service to proxy connections to the read slaves. In this case, in addition to discovery, the slave service provides transparent load balancing to clients. The service specification for the slaves is in `examples/guestbook/redis-slave-service.json` Just like the master, we want to have a service to proxy connections to the read slaves. In this case, in addition to discovery, the slave service provides transparent load balancing to clients. The service specification for the slaves is in `examples/guestbook/redis-slave-service.json`:
```js ```js
{ {
@ -184,9 +193,9 @@ Just like the master, we want to have a service to proxy connections to the read
} }
``` ```
This time the selector for the service is `name=redisslave`, because that identifies the pods running redis slaves. It may also be helpful to set labels on your service itself--as we've done here--to make it easy to locate them with the `kubecfg -l "label=value" list services` command. This time the selector for the service is `name=redisslave`, because that identifies the pods running redis slaves. It may also be helpful to set labels on your service itself as we've done here to make it easy to locate them with the `cluster/kubecfg.sh -l "label=value" list services` command.
Now that you have created the service specification, create it in your cluster with the `kubecfg` CLI: Now that you have created the service specification, create it in your cluster by running:
```shell ```shell
$ cluster/kubecfg.sh -c examples/guestbook/redis-slave-service.json create services $ cluster/kubecfg.sh -c examples/guestbook/redis-slave-service.json create services
@ -195,7 +204,7 @@ $ cluster/kubecfg.sh -c examples/guestbook/redis-slave-service.json create servi
redisslave name=redisslave name=redisslave 6379 redisslave name=redisslave name=redisslave 6379
``` ```
### Step Five: Create the frontend pod. ### Step Five: Create the frontend pod
This is a simple PHP server that is configured to talk to either the slave or master services depending on whether the request is a read or a write. It exposes a simple AJAX interface, and serves an angular-based UX. Like the redis read slaves it is a replicated service instantiated by a replication controller. This is a simple PHP server that is configured to talk to either the slave or master services depending on whether the request is a read or a write. It exposes a simple AJAX interface, and serves an angular-based UX. Like the redis read slaves it is a replicated service instantiated by a replication controller.
@ -217,11 +226,16 @@ The pod is described in the file `examples/guestbook/frontend-controller.json`:
"containers": [{ "containers": [{
"name": "php-redis", "name": "php-redis",
"image": "brendanburns/php-redis", "image": "brendanburns/php-redis",
"cpu": 100,
"memory": 50000000,
"ports": [{"containerPort": 80, "hostPort": 8000}] "ports": [{"containerPort": 80, "hostPort": 8000}]
}] }]
} }
}, },
"labels": {"name": "frontend"} "labels": {
"name": "frontend",
"uses": "redisslave,redis-master"
}
}}, }},
"labels": {"name": "frontend"} "labels": {"name": "frontend"}
} }
@ -242,12 +256,12 @@ Once that's up (it may take ten to thirty seconds to create the pods) you can li
$ cluster/kubecfg.sh list pods $ cluster/kubecfg.sh list pods
ID Image(s) Host Labels Status ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
redis-master-2 dockerfile/redis kubernetes-minion-3.c.briandpe-api.internal name=redis-master Running redis-master dockerfile/redis kubernetes-minion-3.c.briandpe-api.internal name=redis-master Running
4d65822107fcfd52 brendanburns/redis-slave kubernetes-minion-3.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController Running e4469b52-70e7-11e4-9154-0800279696e1 brendanburns/redis-slave kubernetes-minion-3.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController,uses=redis-master Running
380704bb7b4d7c03 brendanburns/php-redis kubernetes-minion-3.c.briandpe-api.internal name=frontend,replicationController=frontendController Running e446dfc0-70e7-11e4-9154-0800279696e1 brendanburns/redis-slave kubernetes-minion-4.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController,uses=redis-master Running
55104dc76695721d brendanburns/php-redis kubernetes-minion-2.c.briandpe-api.internal name=frontend,replicationController=frontendController Running 6b584847-70ee-11e4-9154-0800279696e1 brendanburns/php-redis kubernetes-minion-3.c.briandpe-api.internal name=frontend,replicationController=frontendController,uses=redisslave,redis-master Running
365a858149c6e2d1 brendanburns/php-redis kubernetes-minion-1.c.briandpe-api.internal name=frontend,replicationController=frontendController Running 6b59e6d5-70ee-11e4-9154-0800279696e1 brendanburns/php-redis kubernetes-minion-2.c.briandpe-api.internal name=frontend,replicationController=frontendController,uses=redisslave,redis-master Running
78629a0f5f3f164f brendanburns/redis-slave kubernetes-minion-4.c.briandpe-api.internal name=redisslave,replicationController=redisSlaveController Running 6b57a25d-70ee-11e4-9154-0800279696e1 brendanburns/php-redis kubernetes-minion-1.c.briandpe-api.internal name=frontend,replicationController=frontendController,uses=redisslave,redis-master Running
``` ```
You will see a single redis master pod, two redis slaves, and three frontend pods. You will see a single redis master pod, two redis slaves, and three frontend pods.
@ -269,20 +283,20 @@ if (isset($_GET['cmd']) === true) {
if ($_GET['cmd'] == 'set') { if ($_GET['cmd'] == 'set') {
$client = new Predis\Client([ $client = new Predis\Client([
'scheme' => 'tcp', 'scheme' => 'tcp',
'host' => getenv('REDISMASTER_SERVICE_HOST') ?: getenv('SERVICE_HOST'), 'host' => getenv('REDIS_MASTER_SERVICE_HOST') ?: getenv('SERVICE_HOST'),
'port' => getenv('REDISMASTER_SERVICE_PORT'), 'port' => getenv('REDIS_MASTER_SERVICE_PORT'),
]); ]);
$client->set($_GET['key'], $_GET['value']); $client->set($_GET['key'], $_GET['value']);
print('{"message": "Updated"}'); print('{"message": "Updated"}');
} else { } else {
$read_port = getenv('REDISMASTER_SERVICE_PORT'); $read_port = getenv('REDIS_MASTER_SERVICE_PORT');
if (isset($_ENV['REDISSLAVE_SERVICE_PORT'])) { if (isset($_ENV['REDISSLAVE_SERVICE_PORT'])) {
$read_port = getenv('REDISSLAVE_SERVICE_PORT'); $read_port = getenv('REDISSLAVE_SERVICE_PORT');
} }
$client = new Predis\Client([ $client = new Predis\Client([
'scheme' => 'tcp', 'scheme' => 'tcp',
'host' => getenv('REDISMASTER_SERVICE_HOST') ?: getenv('SERVICE_HOST'), 'host' => getenv('REDIS_MASTER_SERVICE_HOST') ?: getenv('SERVICE_HOST'),
'port' => $read_port, 'port' => $read_port,
]); ]);
@ -306,8 +320,8 @@ You may need to open the firewall for port 8000 using the [console][cloud-consol
$ gcutil addfirewall --allowed=tcp:8000 --target_tags=kubernetes-minion kubernetes-minion-8000 $ gcutil addfirewall --allowed=tcp:8000 --target_tags=kubernetes-minion kubernetes-minion-8000
``` ```
If you are running Kubernetes locally, you can just visit http://localhost:8000 If you are running Kubernetes locally, you can just visit http://localhost:8000.
For details about limiting traffic to specific sources, see the [gcutil documentation][gcutil-docs] For details about limiting traffic to specific sources, see the [gcutil documentation][gcutil-docs].
[cloud-console]: https://console.developer.google.com [cloud-console]: https://console.developer.google.com
[gcutil-docs]: https://developers.google.com/compute/docs/gcutil/reference/firewall#addfirewall [gcutil-docs]: https://developers.google.com/compute/docs/gcutil/reference/firewall#addfirewall

37
examples/guestbook/index.php
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@ -1,37 +0,0 @@
<?
set_include_path('.:/usr/share/php:/usr/share/pear:/vendor/predis');
error_reporting(E_ALL);
ini_set('display_errors', 1);
require 'predis/autoload.php';
if (isset($_GET['cmd']) === true) {
header('Content-Type: application/json');
if ($_GET['cmd'] == 'set') {
$client = new Predis\Client([
'scheme' => 'tcp',
'host' => getenv('REDISMASTER_SERVICE_HOST') ?: getenv('SERVICE_HOST'),
'port' => getenv('REDISMASTER_SERVICE_PORT'),
]);
$client->set($_GET['key'], $_GET['value']);
print('{"message": "Updated"}');
} else {
$read_port = getenv('REDISMASTER_SERVICE_PORT');
if (isset($_ENV['REDISSLAVE_SERVICE_PORT'])) {
$read_port = getenv('REDISSLAVE_SERVICE_PORT');
}
$client = new Predis\Client([
'scheme' => 'tcp',
'host' => getenv('REDISMASTER_SERVICE_HOST') ?: getenv('SERVICE_HOST'),
'port' => $read_port,
]);
$value = $client->get($_GET['key']);
print('{"data": "' . $value . '"}');
}
} else {
phpinfo();
} ?>