[英]How can I edit an xml line from user data in ec2 instance?
我在從后端啟動的多個ec2實例中使用Wowza流引擎。 我需要一種將邊緣實例與原始鏈接的方法,為此,我需要更新xml文件中特定行的值。 邊緣旋轉時,我已經在用戶數據中加載了ip。 我需要啟動一個腳本來從用戶數據中編輯此標記中的值嗎? 謝謝
您可以讓服務器偵聽器將IP地址加載到自定義變量中。 然后,您可以讓配置文件引用此自定義變量。 這與填充Wowza EC2變量(例如“ com.wowza.amazonaws.ec2.AWSEC2_METADATA_LOCAL_IPV4”)的方法相同。 這些可以作為添加到Wowza配置文件中
${com.wowza.amazonaws.ec2.AWSEC2_METADATA_LOCAL_IPV4}
這是此示例的實現(請注意,這是舊文章中的代碼)。
package com.wowza.wms.plugin.amazonaws.ec2.env;
import com.wowza.util.*;
import com.wowza.wms.server.*;
import com.wowza.wms.vhost.HostPort;
import com.wowza.wms.logging.*;
public class ServerListenerEC2Variables implements IServerNotify2
{
public static final String VARPREFIX = "com.wowza.amazonaws.ec2";
public static final String VAR_AMI_ID = "AWSEC2_METADATA_AMI_ID";
public static final String VAR_AMI_LAUNCH_INDEX = "AWSEC2_METADATA_AMI_LAUNCH_INDEX";
public static final String VAR_AMI_MANIFEST_PATH = "AWSEC2_METADATA_AMI_MANIFEST_PATH";
public static final String VAR_INSTANCE_ID = "AWSEC2_METADATA_INSTANCE_ID";
public static final String VAR_INSTANCE_TYPE = "AWSEC2_METADATA_INSTANCE_TYPE";
public static final String VAR_HOSTNAME = "AWSEC2_METADATA_HOSTNAME";
public static final String VAR_LOCAL_HOSTNAME = "AWSEC2_METADATA_LOCAL_HOSTNAME";
public static final String VAR_LOCAL_IPV4 = "AWSEC2_METADATA_LOCAL_IPV4";
public static final String VAR_PUBLIC_HOSTNAME = "AWSEC2_METADATA_PUBLIC_HOSTNAME";
public static final String VAR_PUBLIC_IPV4 = "AWSEC2_METADATA_PUBLIC_IPV4";
public static final String VAR_RESERVATION_ID = "AWSEC2_METADATA_RESERVATION_ID";
public static final String VAR_SECURITY_GROUPS = "AWSEC2_METADATA_SECURITY_GROUPS";
public static final String VAR_PRODUCT_CODES = "AWSEC2_METADATA_PRODUCT_CODES";
private void populateEnvironment()
{
try
{
String[] urls = {
"http://169.254.169.254/latest/meta-data/ami-id",
"http://169.254.169.254/latest/meta-data/ami-launch-index",
"http://169.254.169.254/latest/meta-data/ami-manifest-path",
"http://169.254.169.254/latest/meta-data/instance-id",
"http://169.254.169.254/latest/meta-data/instance-type",
"http://169.254.169.254/latest/meta-data/hostname",
"http://169.254.169.254/latest/meta-data/local-hostname",
"http://169.254.169.254/latest/meta-data/local-ipv4",
"http://169.254.169.254/latest/meta-data/public-hostname",
"http://169.254.169.254/latest/meta-data/public-ipv4",
/* "http://169.254.169.254/2007-03-01/meta-data/public-keys/", */
"http://169.254.169.254/latest/meta-data/reservation-id",
"http://169.254.169.254/latest/meta-data/security-groups",
"http://169.254.169.254/latest/meta-data/product-codes",
};
for(int i=0;i<urls.length;i++)
{
String url = urls[i];
byte[] data = HTTPUtils.HTTPRequestToByteArray(url, "GET", null, null);
if (data != null)
{
String[] urlParts = url.split("/");
if (urlParts.length > 1)
{
try
{
String key = VARPREFIX+"."+"AWSEC2_METADATA_"+urlParts[urlParts.length-1].replace("-", "_").toUpperCase();
String value = new String(data, "UTF-8");
System.setProperty(key, value);
WMSLoggerFactory.getLogger(ServerListenerEC2Variables.class).info(key+": "+value);
}
catch (Exception e)
{
WMSLoggerFactory.getLogger(ServerListenerEC2Variables.class).error("ServerListenerEC2Variables.populateEnvironment: conversion to string: "+e.toString());
}
}
}
}
}
catch (Exception e)
{
WMSLoggerFactory.getLogger(ServerListenerEC2Variables.class).error("ServerListenerEC2Variables.populateEnvironment: "+e.toString());
}
}
public void onServerConfigLoaded(IServer server)
{
populateEnvironment();
Server inServer = (Server)server;
JMXRemoteConfig remoteConfig = inServer.getJmxRemoteConfig();
while(true)
{
String ipAddress = remoteConfig.getIpAddress();
if (ipAddress == null)
break;
ipAddress = SystemUtils.expandEnvironmentVariables(ipAddress);
WMSLoggerFactory.getLogger(ServerListenerEC2Variables.class).info("Updating JMX IpAddress: "+ipAddress);
remoteConfig.setIpAddress(ipAddress);
break;
}
while(true)
{
String ipAddress = remoteConfig.getRmiServerHostName();
if (ipAddress == null)
break;
ipAddress = SystemUtils.expandEnvironmentVariables(ipAddress);
WMSLoggerFactory.getLogger(ServerListenerEC2Variables.class).info("Updating JMX RMIServerHostName: "+ipAddress);
remoteConfig.setRmiServerHostName(ipAddress);
break;
}
while(true)
{
String propName = "loadBalancerSenderRedirectAddress";
String ipAddress = server.getProperties().getPropertyStr(propName);
if (ipAddress == null)
break;
ipAddress = SystemUtils.expandEnvironmentVariables(ipAddress);
WMSLoggerFactory.getLogger(ServerListenerEC2Variables.class).info("Updating Server.property."+propName+": "+ipAddress);
server.getProperties().setProperty(propName, ipAddress);
break;
}
}
public void onServerCreate(IServer server)
{
}
public void onServerInit(IServer server)
{
}
public void onServerShutdownStart(IServer server)
{
}
public void onServerShutdownComplete(IServer server)
{
}
}
假設origin_ip已定義:
script = "#!/bin/bash
sed -i -e '/<Name>loadbalanceServerIP<\\/Name>/,/<Value>/s/<Value>[^<]*/<Value>#{origin_ip}/' /home/wowza/conf/Server.xml
sudo service WowzaStreamingEngine restart"
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