Is the first set of comment out code below an issue for xml to process since it is put inside of the tag?
<!--Define name="default election policy">
<Policy name="DefaultToWaive"/>
</Define-->
<!--
<Define name="default election policy">
<Policy name="DefaultToWaive"/>
</Define>
-->
No, it's not an issue. It's just interpreted as a comment starting with "Define name=...". It also doesn't matter if you put it on the same line or on separate lines. You could as well write:
<!--<Define name="default election policy">
<Policy name="DefaultToWaive"/>
</Define>-->
Related
I am trying to change an old classic cloud service to use an HTTP health probe instead of the default process-based check. We've had some issues where instances stopped working but it thought they were still usable because they were running, but couldn't respond to requests.
Our site is HTTPS only, we don't even have an HTTP endpoint defined. Or didn't. The load balancer doesn't support HTTPS, so I had to add an HTTP endpoint and configure that to be used instead. That's gross but it seems to work. However, the HTTPS site doesn't seem to be covered by the health checks for the HTTP endpoint.
If I query my health probe path via HTTP, I can see that it's returning a 503, and if all instances return a 503 I can see that endpoint fail to load until I make one return 200 again. Once I make one return a 200 again, it works. My requests get routed to the appropriate node, if possible.
However, the HTTPS requests always seem to go to the same instance, regardless of the probes. Flipping that instance from 200 to 503 doesn't cause those requests to go to the other instance, like it does with HTTP. It isn't balanced at all.
It's really hard to find useful documentation or examples on how this should be set up or if it can work at all. Below is my csdef file. Is it possible to get this working (either an HTTPS check or the HTTP check affecting the HTTPS endpoint)?
<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="..." xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2015-04.2.6">
<LoadBalancerProbes>
<LoadBalancerProbe name="health" protocol="http" port="80" path="health" intervalInSeconds="5" timeoutInSeconds="11"></LoadBalancerProbe>
</LoadBalancerProbes>
<WebRole name="..." vmsize="Standard_D2_v3">
<Sites>
<Site name="Web">
<Bindings>
<Binding name="Endpoint1" endpointName="Endpoint1" />
<Binding name="LoadBalancerEndpointBinding" endpointName="LoadBalancerEndpoint" />
</Bindings>
</Site>
</Sites>
<Endpoints>
<InputEndpoint name="Endpoint1" protocol="https" port="443" certificate="..." />
<InputEndpoint name="LoadBalancerEndpoint" protocol="http" port="80" loadBalancerProbe="health" />
</Endpoints>
<ConfigurationSettings>
<!-- ... -->
</ConfigurationSettings>
<Certificates>
<!-- ... -->
</Certificates>
</WebRole>
</ServiceDefinition>
The answer in my case was to add the loadBalancerProbe attribute to both endpoint elements. I also had to make sure that however I was testing the service made new connections for every request or they would always go to the same instance (e.g. HttpClient pools connections internally per instance). This is essentially the new working configuration file:
<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="..." xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2015-04.2.6">
<LoadBalancerProbes>
<LoadBalancerProbe name="health" protocol="http" port="80" path="health" intervalInSeconds="5" timeoutInSeconds="11"></LoadBalancerProbe>
</LoadBalancerProbes>
<WebRole name="..." vmsize="Standard_D2_v3">
<Sites>
<Site name="Web">
<Bindings>
<Binding name="Endpoint1" endpointName="Endpoint1" />
<Binding name="LoadBalancerEndpointBinding" endpointName="LoadBalancerEndpoint" />
</Bindings>
</Site>
</Sites>
<Endpoints>
<InputEndpoint name="Endpoint1" protocol="https" port="443" certificate="..." loadBalancerProbe="health" />
<InputEndpoint name="LoadBalancerEndpoint" protocol="http" port="80" loadBalancerProbe="health" />
</Endpoints>
<ConfigurationSettings>
<!-- ... -->
</ConfigurationSettings>
<Certificates>
<!-- ... -->
</Certificates>
</WebRole>
</ServiceDefinition>
Our project structure regarding the logback.xmls looks like this:
src\main\resources\logback.xml
src\main\resources\config\dev\logback.xml
src\main\resources\config\sjngm\dev\logback.xml
src\main\resources\config\int\logback.xml
src\main\resources\config\local\logback.xml
src\main\resources\config\prod\logback.xml
where the first one references to the environment specific one:
<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="30 seconds">
<contextName>sjngm</contextName>
<jmxConfigurator />
<include resource="config/${extra}${env:-local}/logback.xml" />
</configuration>
Note that extra is not defined most of the times, which is why used this for a while:
<include resource="config/${extra:-}${env:-local}/logback.xml" />
This stopped working at one point, can't remember which version of logback. So we changed it to
<include resource="config/${extra:-./}${env:-local}/logback.xml" />
which also worked for quite a while.
Now we switched to Spring Boot 1.5.4 (contains logback-classic 1.1.11 and logback-core 1.1.11) and it stopped working again. The latest error message is:
11:08:15,020 |-WARN in ch.qos.logback.core.joran.action.IncludeAction - Could not find resource corresponding to [config/./local/logback.xml]
If I go back to
<include resource="config/${extra:-}${env:-local}/logback.xml" />
the message is
11:19:28,778 |-WARN in ch.qos.logback.core.joran.action.IncludeAction - Could not find resource corresponding to [config/extra_IS_UNDEFINEDlocal/logback.xml]
Note that logback still uses "local" as a default string for env, so not all is broken.
What do I do now? Basically I want to tell logback that I want an empty string where extra would be.
This also doesn't work:
<property name="defaultExtra" value="" />
<include resource="config/${extra:-${defaultExtra}}${env:-local}/logback.xml" />
as an empty string seems to always result in an undefined property.
The only working thing I can come up with is this:
<if condition='isDefined("extra")'>
<then>
<include resource="config/${extra}${env:-local}/logback.xml" />
</then>
<else>
<include resource="config/${env:-local}/logback.xml" />
</else>
</if>
plus this into the pom.xml:
<dependency>
<groupId>org.codehaus.janino</groupId>
<artifactId>janino</artifactId>
</dependency>
Isn't this nice?! So why did they have to break what was working nicely???
This worked for me:
<property name="extra" value="${logback.myApp.extra:- }" />
Logback seems to trim Whitespace out of the value. So the default value of Space did the trick.
Embedded Whitespace is preserved, which may lead to a FileNotFoundException if Tabs were embedded, but embedded Spaces were ok.
Setting a Property in a Java Initialiser had the desired effect:
System.setProperty("logback.myApp.extra", "\t \tEXTRA_EXTRA_EXTRA\t \t");
The Tabs & Spaces were removed from the Property, which was assigned the value EXTRA_EXTRA_EXTRA
(the Java Initialiser must be invoked before any Logging has taken place & may contain no Logging itself)
You could of course set the Property on the Java Command line.
P.S. if the Property is undefined & you omit the Space (${logback.myApp.extra:-}), it is assigned the value:
logback.myApp.extra_IS_UNDEFINED
...so it may be wise to add a suitable comment:
<property name="extra" value="${logback.myApp.extra:- }" /><!-- N.B. Empty Default value must contain # least 1 Space!! -->
I have setup session replication between two tomcats running on different machine using mod_jk, when one tomcat is down, my session is getting expired, and when I refresh its going to next tomcat. But ideally, it shouldn't get expired. Any help will be highly appreciated. Here is my config files.
Server.xml
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- Clustering configuration start -->
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
<!--<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>-->
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564" frequency="500"
dropTime="3000"/>
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="auto" port="4000" autoBind="100"
selectorTimeout="5000" maxThreads="6"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve" />
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener" />
workers.properties
# First we define virtual worker's list
worker.list=jkstatus,LoadBalancer
# Enable virtual workers earlier
worker.jkstatus.type=status
worker.LoadBalancer.type=lb
# Add Tomcat instances as workers, three workers in our case
worker.worker1.type=ajp13
worker.worker1.host=localhost
worker.worker1.port=8009
worker.worker2.type=ajp13
worker.worker2.host=10.57.79.232
worker.worker2.port=8019
# Provide workers list to the load balancer
worker.LoadBalancer.balance_workers=worker1,worker2
We use Spring DSL to define camel routes. In one case the message headers disappear.
Our design requires an audit trail to help debug issues, and prove that messages are moving as designed.
We use and reference an audit processor to create a message file name from 2 headers, 1 is constant, the other is a unique variable.
We can't use setHeader in the case of the variable one.
Here is a generic example which includes commented attempts that failed:
<route id="msg_in">
<from uri="direct:msg_in" />
<wireTap ref="audit" processorRef="auditPreprocessor" />
<to uri="direct:to_json" />
</route>
<route id="to_json">
<from uri="direct:to_json" />
<!-- the below seemed to have failed -->
<!-- <setProperty propertyName="SaveId"> -->
<!-- <simple>${in.header.UniqueId}</simple> -->
<!-- </setProperty> -->
<bean ref="JDBCProcessor1" />
<!-- headers still exist here -->
<bean ref="ToJSON1" />
<!-- headers still exist here, and wireTap on the next line works -->
<wireTap ref="audit" processorRef="auditPreprocessor" />
<bean ref="toJSON" />
<!-- Message headers do not get to here so we need to set them again ? -->
<setHeader headerName="Hdr1">
<constant>Update1</constant>
</setHeader>
<!-- <setHeader headerName="UniqueId"> -->
<!-- <simple>${exchangeProperty:SaveId}</simple> ... this didn't work -->
<!-- <simple>${properties:SaveId}</simple> ... this didn't work -->
<!-- </setHeader> -->
<to uri="direct:msg_out" />
</route>
<route id="msg_out">
<from uri="direct:msg_out" />
<!-- we try wireTap here but no headers, saved file is null-null
and gets continually overwritten, so no usable audit trail -->
</route>
I spent considerable time trying to find the right way to do this in Spring xml, but no luck yet.
Thanks in advance if anyone can help.
I have the following code snippet:
<int-file:inbound-channel-adapter id="filteredFiles"
directory="#{controllerConfig['CYCLE'].params['SEMAPHORE_DIR']}"
channel="semaphoreChannel" filename-pattern="*.xml" prevent-duplicates="false">
<int:poller max-messages-per-poll="1" cron ="#{controllerConfig['CYCLE'].controllerTimer}"/>
</int-file:inbound-channel-adapter>
...
Later in the flow in have a header enricher:
<int:header-enricher id="Channel Name Setter">
<int:header name="channel.id" value="CYCLE"/>
<int:header name="flow.id" overwrite="true" value="#{T(hu.telekom.fdl.util.TimeBasedUUIDGenerator).generateId()}"/>
</int:header-enricher>
The problem is that although I used the overwrite="true" property the flow.id seems unchanged when the inbound-channel-adapter reads the second file.
Thanks,
Expressions with the form #{...} are evaluated once only, during context initialization. You need to use a runtime expression:
<int:header name="flow.id" overwrite="true" expresion="T(hu.telekom.fdl.util.TimeBasedUUIDGenerator).generateId()"/>
i.e. use expression= and remove the #{}.
You only need overwrite="true" if the header is already present on the inbound message to the enricher.