YARN-7201. Added an apache httpd example YARN service. Contributed by Billie Rinaldi
This commit is contained in:
parent
ce74e64363
commit
c70e5df100
|
@ -0,0 +1,62 @@
|
|||
{
|
||||
"name": "httpd-service-no-dns",
|
||||
"lifetime": "3600",
|
||||
"components": [
|
||||
{
|
||||
"name": "httpd",
|
||||
"number_of_containers": 2,
|
||||
"artifact": {
|
||||
"id": "centos/httpd-24-centos7:latest",
|
||||
"type": "DOCKER"
|
||||
},
|
||||
"launch_command": "/usr/bin/run-httpd",
|
||||
"resource": {
|
||||
"cpus": 1,
|
||||
"memory": "1024"
|
||||
},
|
||||
"readiness_check": {
|
||||
"type": "HTTP",
|
||||
"props": {
|
||||
"url": "http://${THIS_HOST}:8080"
|
||||
}
|
||||
},
|
||||
"configuration": {
|
||||
"files": [
|
||||
{
|
||||
"type": "ENV",
|
||||
"dest_file": "/var/www/html/index.html",
|
||||
"props": {
|
||||
"content": "<html><header><title>Title</title></header><body>Hello from ${COMPONENT_INSTANCE_NAME}!</body></html>"
|
||||
}
|
||||
}
|
||||
]
|
||||
}
|
||||
},
|
||||
{
|
||||
"name": "httpd-proxy",
|
||||
"number_of_containers": 1,
|
||||
"dependencies": [ "httpd" ],
|
||||
"artifact": {
|
||||
"id": "centos/httpd-24-centos7:latest",
|
||||
"type": "DOCKER"
|
||||
},
|
||||
"launch_command": "/usr/bin/run-httpd",
|
||||
"resource": {
|
||||
"cpus": 1,
|
||||
"memory": "1024"
|
||||
},
|
||||
"configuration": {
|
||||
"files": [
|
||||
{
|
||||
"type": "TEMPLATE",
|
||||
"dest_file": "/etc/httpd/conf.d/httpd-proxy.conf",
|
||||
"src_file": "httpd-proxy-no-dns.conf"
|
||||
}
|
||||
]
|
||||
}
|
||||
}
|
||||
],
|
||||
"quicklinks": {
|
||||
"Apache HTTP Server": "http://httpd-proxy-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080"
|
||||
}
|
||||
}
|
|
@ -0,0 +1,24 @@
|
|||
#
|
||||
# Licensed to the Apache Software Foundation (ASF) under one or more
|
||||
# contributor license agreements. See the NOTICE file distributed with
|
||||
# this work for additional information regarding copyright ownership.
|
||||
# The ASF licenses this file to You 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.
|
||||
|
||||
<Proxy balancer://test>
|
||||
BalancerMember http://${HTTPD-0_IP}:8080
|
||||
BalancerMember http://${HTTPD-1_IP}:8080
|
||||
ProxySet lbmethod=bytraffic
|
||||
</Proxy>
|
||||
|
||||
ProxyPass "/" "balancer://test/"
|
||||
ProxyPassReverse "/" "balancer://test/"
|
|
@ -0,0 +1,24 @@
|
|||
#
|
||||
# Licensed to the Apache Software Foundation (ASF) under one or more
|
||||
# contributor license agreements. See the NOTICE file distributed with
|
||||
# this work for additional information regarding copyright ownership.
|
||||
# The ASF licenses this file to You 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.
|
||||
|
||||
<Proxy balancer://test>
|
||||
BalancerMember http://httpd-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080
|
||||
BalancerMember http://httpd-1.${SERVICE_NAME}.${USER}.${DOMAIN}:8080
|
||||
ProxySet lbmethod=bytraffic
|
||||
</Proxy>
|
||||
|
||||
ProxyPass "/" "balancer://test/"
|
||||
ProxyPassReverse "/" "balancer://test/"
|
|
@ -0,0 +1,55 @@
|
|||
{
|
||||
"name": "httpd-service",
|
||||
"lifetime": "3600",
|
||||
"components": [
|
||||
{
|
||||
"name": "httpd",
|
||||
"number_of_containers": 2,
|
||||
"artifact": {
|
||||
"id": "centos/httpd-24-centos7:latest",
|
||||
"type": "DOCKER"
|
||||
},
|
||||
"launch_command": "/usr/bin/run-httpd",
|
||||
"resource": {
|
||||
"cpus": 1,
|
||||
"memory": "1024"
|
||||
},
|
||||
"configuration": {
|
||||
"files": [
|
||||
{
|
||||
"type": "ENV",
|
||||
"dest_file": "/var/www/html/index.html",
|
||||
"props": {
|
||||
"content": "<html><header><title>Title</title></header><body>Hello from ${COMPONENT_INSTANCE_NAME}!</body></html>"
|
||||
}
|
||||
}
|
||||
]
|
||||
}
|
||||
},
|
||||
{
|
||||
"name": "httpd-proxy",
|
||||
"number_of_containers": 1,
|
||||
"artifact": {
|
||||
"id": "centos/httpd-24-centos7:latest",
|
||||
"type": "DOCKER"
|
||||
},
|
||||
"launch_command": "/usr/bin/run-httpd",
|
||||
"resource": {
|
||||
"cpus": 1,
|
||||
"memory": "1024"
|
||||
},
|
||||
"configuration": {
|
||||
"files": [
|
||||
{
|
||||
"type": "TEMPLATE",
|
||||
"dest_file": "/etc/httpd/conf.d/httpd-proxy.conf",
|
||||
"src_file": "httpd-proxy.conf"
|
||||
}
|
||||
]
|
||||
}
|
||||
}
|
||||
],
|
||||
"quicklinks": {
|
||||
"Apache HTTP Server": "http://httpd-proxy-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080"
|
||||
}
|
||||
}
|
|
@ -52,6 +52,11 @@ public interface ServiceApiConstants {
|
|||
|
||||
String CONTAINER_ID = $("CONTAINER_ID");
|
||||
|
||||
// Templates for component instance host/IP
|
||||
String COMPONENT_HOST = $("%s_HOST");
|
||||
|
||||
String COMPONENT_IP = $("%s_IP");
|
||||
|
||||
// Constants for default cluster ZK
|
||||
String CLUSTER_ZK_QUORUM = $("CLUSTER_ZK_QUORUM");
|
||||
|
||||
|
|
|
@ -47,8 +47,10 @@ import org.slf4j.LoggerFactory;
|
|||
|
||||
import java.text.MessageFormat;
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collection;
|
||||
import java.util.Collections;
|
||||
import java.util.EnumSet;
|
||||
import java.util.HashMap;
|
||||
import java.util.LinkedList;
|
||||
import java.util.List;
|
||||
import java.util.Map;
|
||||
|
@ -58,6 +60,7 @@ import java.util.concurrent.atomic.AtomicLong;
|
|||
import java.util.concurrent.locks.ReentrantReadWriteLock;
|
||||
|
||||
import static org.apache.hadoop.yarn.api.records.ContainerExitStatus.*;
|
||||
import static org.apache.hadoop.yarn.service.api.ServiceApiConstants.*;
|
||||
import static org.apache.hadoop.yarn.service.component.ComponentEventType.*;
|
||||
import static org.apache.hadoop.yarn.service.component.instance.ComponentInstanceEventType.START;
|
||||
import static org.apache.hadoop.yarn.service.component.instance.ComponentInstanceEventType.STOP;
|
||||
|
@ -386,6 +389,34 @@ public class Component implements EventHandler<ComponentEvent> {
|
|||
return true;
|
||||
}
|
||||
|
||||
public Map<String, String> getDependencyHostIpTokens() {
|
||||
Map<String, String> tokens = new HashMap<>();
|
||||
List<String> dependencies = componentSpec.getDependencies();
|
||||
if (SliderUtils.isEmpty(dependencies)) {
|
||||
return tokens;
|
||||
}
|
||||
for (String dependency : dependencies) {
|
||||
Collection<ComponentInstance> instances = scheduler.getAllComponents()
|
||||
.get(dependency).getAllComponentInstances().values();
|
||||
for (ComponentInstance instance : instances) {
|
||||
if (instance.getContainerStatus() == null) {
|
||||
continue;
|
||||
}
|
||||
if (SliderUtils.isEmpty(instance.getContainerStatus().getIPs()) ||
|
||||
SliderUtils.isUnset(instance.getContainerStatus().getHost())) {
|
||||
continue;
|
||||
}
|
||||
String ip = instance.getContainerStatus().getIPs().get(0);
|
||||
String host = instance.getContainerStatus().getHost();
|
||||
tokens.put(String.format(COMPONENT_IP,
|
||||
instance.getCompInstanceName().toUpperCase()), ip);
|
||||
tokens.put(String.format(COMPONENT_HOST,
|
||||
instance.getCompInstanceName().toUpperCase()), host);
|
||||
}
|
||||
}
|
||||
return tokens;
|
||||
}
|
||||
|
||||
private void incRunningContainers() {
|
||||
componentMetrics.containersRunning.incr();
|
||||
scheduler.getServiceMetrics().containersRunning.incr();
|
||||
|
|
|
@ -397,6 +397,7 @@ public class ProviderUtils implements YarnServiceConstants {
|
|||
tokens.put(CONTAINER_ID, instance.getContainer().getId().toString());
|
||||
tokens.put(COMPONENT_ID,
|
||||
String.valueOf(instance.getCompInstanceId().getId()));
|
||||
tokens.putAll(instance.getComponent().getDependencyHostIpTokens());
|
||||
return tokens;
|
||||
}
|
||||
}
|
||||
|
|
|
@ -1550,6 +1550,10 @@ public class RegistryDNS extends AbstractService implements DNSOperations,
|
|||
private final RegistryCommand removeRecordCommand = new RegistryCommand() {
|
||||
@Override
|
||||
public void exec(Zone zone, Record record) throws IOException {
|
||||
if (zone == null) {
|
||||
LOG.error("Unable to remove record because zone is null: {}", record);
|
||||
return;
|
||||
}
|
||||
zone.removeRecord(record);
|
||||
LOG.info("Removed {}", record);
|
||||
if (isDNSSECEnabled()) {
|
||||
|
|
|
@ -0,0 +1,159 @@
|
|||
<!---
|
||||
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. See accompanying LICENSE file.
|
||||
-->
|
||||
|
||||
# YARN Service Examples
|
||||
|
||||
This document describes some example service definitions (`Yarnfile`).
|
||||
|
||||
<!-- MACRO{toc|fromDepth=0|toDepth=3} -->
|
||||
|
||||
## Apache web server - httpd (with registry DNS)
|
||||
Below is the `Yarnfile` for a service called `httpd-service` with two `httpd` instances.
|
||||
There is also an httpd proxy instance (httpd-proxy-0) that proxies between the other two httpd instances (httpd-0 and httpd-1).
|
||||
|
||||
Note this example requires registry DNS.
|
||||
```
|
||||
{
|
||||
"name": "httpd-service",
|
||||
"lifetime": "3600",
|
||||
"components": [
|
||||
{
|
||||
"name": "httpd",
|
||||
"number_of_containers": 2,
|
||||
"artifact": {
|
||||
"id": "centos/httpd-24-centos7:latest",
|
||||
"type": "DOCKER"
|
||||
},
|
||||
"launch_command": "/usr/bin/run-httpd",
|
||||
"resource": {
|
||||
"cpus": 1,
|
||||
"memory": "1024"
|
||||
},
|
||||
"configuration": {
|
||||
"files": [
|
||||
{
|
||||
"type": "ENV",
|
||||
"dest_file": "/var/www/html/index.html",
|
||||
"props": {
|
||||
"content": "<html><header><title>Title</title></header><body>Hello from ${COMPONENT_INSTANCE_NAME}!</body></html>"
|
||||
}
|
||||
}
|
||||
]
|
||||
}
|
||||
},
|
||||
{
|
||||
"name": "httpd-proxy",
|
||||
"number_of_containers": 1,
|
||||
"artifact": {
|
||||
"id": "centos/httpd-24-centos7:latest",
|
||||
"type": "DOCKER"
|
||||
},
|
||||
"launch_command": "/usr/bin/run-httpd",
|
||||
"resource": {
|
||||
"cpus": 1,
|
||||
"memory": "1024"
|
||||
},
|
||||
"configuration": {
|
||||
"files": [
|
||||
{
|
||||
"type": "TEMPLATE",
|
||||
"dest_file": "/etc/httpd/conf.d/httpd-proxy.conf",
|
||||
"src_file": "httpd-proxy.conf"
|
||||
}
|
||||
]
|
||||
}
|
||||
}
|
||||
],
|
||||
"quicklinks": {
|
||||
"Apache HTTP Server": "http://httpd-proxy-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080"
|
||||
}
|
||||
}
|
||||
```
|
||||
This `Yarnfile` is already included in the Hadoop distribution, along with the required configuration template `httpd-proxy.conf`.
|
||||
First upload the configuration template file to HDFS:
|
||||
```
|
||||
hdfs dfs -copyFromLocal ${HADOOP_YARN_HOME}/share/hadoop/yarn/yarn-service-examples/httpd/httpd-proxy.conf .
|
||||
```
|
||||
|
||||
The proxy configuration template looks like the following and will configure the httpd-proxy-0 container to balance between the httpd-0 and httpd-1 containers evenly:
|
||||
```
|
||||
<Proxy balancer://test>
|
||||
BalancerMember http://httpd-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080
|
||||
BalancerMember http://httpd-1.${SERVICE_NAME}.${USER}.${DOMAIN}:8080
|
||||
ProxySet lbmethod=bytraffic
|
||||
</Proxy>
|
||||
|
||||
ProxyPass "/" "balancer://test/"
|
||||
ProxyPassReverse "/" "balancer://test/"
|
||||
```
|
||||
|
||||
Then run the service with the command:
|
||||
```
|
||||
yarn service create [service-name] --example httpd
|
||||
```
|
||||
where `service-name` is optional. If omitted, it uses the name defined in the `Yarnfile`.
|
||||
|
||||
Once the service is running, navigate to `http://httpd-proxy-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080` to see the root page.
|
||||
The pages should alternately show "Hello from httpd-0!" or "Hello from httpd-1!"
|
||||
|
||||
The individual httpd URLs can also be visited, `http://httpd-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080` and `http://httpd-1.${SERVICE_NAME}.${USER}.${DOMAIN}:8080`.
|
||||
|
||||
If unsure of your hostnames, visit the apiserver REST endpoint `http://<apiserver host>:9191/ws/v1/services/httpd-service`.
|
||||
|
||||
## Apache web server - httpd (without registry DNS)
|
||||
|
||||
A similar IP-based example is provided for environments that do not have registry DNS set up.
|
||||
The service name for this example is `httpd-service-no-dns`.
|
||||
There are a couple of additions to the `Yarnfile` for the `httpd-service` described above.
|
||||
A readiness check is added for the `httpd` component:
|
||||
```
|
||||
"readiness_check": {
|
||||
"type": "HTTP",
|
||||
"props": {
|
||||
"url": "http://${THIS_HOST}:8080"
|
||||
}
|
||||
},
|
||||
```
|
||||
and `httpd` is added as a dependency for the `httpd-proxy` component:
|
||||
```
|
||||
"dependencies": [ "httpd" ],
|
||||
```
|
||||
|
||||
This means that the httpd-proxy-0 instance will not be started until after an HTTP probe has succeeded for the httpd-0 and httpd-1 containers.
|
||||
This is necessary so that the IPs of the containers can be used in the configuration of httpd-proxy-0.
|
||||
The proxy configuration is similar to that of the previous example, with the BalancerMember lines changed as follows:
|
||||
```
|
||||
BalancerMember http://${HTTPD-0_IP}:8080
|
||||
BalancerMember http://${HTTPD-1_IP}:8080
|
||||
```
|
||||
|
||||
Note that IP and HOST variables such as `${HTTPD-0_IP}` and `${HTTPD-0_HOST}` should only be used by a component that has a dependency on the named component (`httpd` in this case) AND should only be used when the named component specifies a readiness check.
|
||||
Here, `httpd-proxy` has a dependency on `httpd` and `httpd` has an HTTP readiness check.
|
||||
Without the dependency and readiness check, the httpd-proxy-0 container would be started in parallel with the httpd-0 and http-1 containers, and the IPs and hosts would not be assigned yet for httpd-0 and httpd-1.
|
||||
|
||||
Other variables can be used by any component.
|
||||
|
||||
Before creating the service, upload the proxy configuration to HDFS:
|
||||
```
|
||||
hdfs dfs -copyFromLocal ${HADOOP_YARN_HOME}/share/hadoop/yarn/yarn-service-examples/httpd-no-dns/httpd-proxy-no-dns.conf .
|
||||
```
|
||||
|
||||
Then run the service with the command:
|
||||
```
|
||||
yarn service create [service-name] --example httpd-no-dns
|
||||
```
|
||||
where `service-name` is optional. If omitted, it uses the name defined in the `Yarnfile`.
|
||||
|
||||
Look up your IPs at the apiserver REST endpoint `http://<apiserver host>:9191/ws/v1/services/httpd-service`.
|
||||
Then visit port 8080 for each IP to view the pages.
|
|
@ -52,7 +52,8 @@ The benefits of combining these workloads are two-fold:
|
|||
|
||||
* [Concepts](Concepts.md): Describes the internals of the framework and some features in YARN core to support running services on YARN.
|
||||
* [Service REST API](YarnServiceAPI.md): The API doc for deploying/managing services on YARN.
|
||||
* [Service Discovery](ServiceDiscovery.md): Deep dives into the YARN DNS internals
|
||||
* [Service Discovery](ServiceDiscovery.md): Deep dives into the YARN DNS internals.
|
||||
* [Examples](Examples.md): List some example service definitions (`Yarnfile`).
|
||||
|
||||
|
||||
|
||||
|
|
Loading…
Reference in New Issue