Passa ai contenuti principali

Tomcat Access logs

Access logs are customized logs, which record all requests processed by the server giving information about:

  • The user that has accessed the application
  • What components of the application are accessed
  • Remote IP and so on

These logs play a vital role in traffic analysis of many applications to analyze the bandwidth requirement and they also help in troubleshooting the application under a heavy load. These logs are configured in  server.xml in  TOMCAT_HOME/conf .
You can configure access logs according to the environment and your auditing requirements. Let's see the pattern format of the access logs and understand how we can customize the logging format:
And now some explanation about the parameters contained in the AccessLogValve:

  • Class Name: This parameter defines the class name used for the generation of logs. By default, Apache Tomcat 7 uses the  org.apache.catalina.valves.AccessLogValve class for the access logs.
  • Directory: This parameter defines the directory location for the log file. All the log files are generated in the log directory— TOMCAT_HOME/logs —but we can customize the log location based on our environment setup and then update the directory path in the definition of the access logs.
  • Prefix: This parameter defines the prefix of the access log filename, that is, by default, the access log files are generated by the name  localhost_access_log.yy-mm-dd.txt .
  • Suffix: This parameter defines the file extension of the log file. Currently it is in  .txt format.
  • Pattern: This parameter defines the format of the log file. The pattern is a combination of values defined by the administrator, for example,  %h = remote host address. 

Etichette:

Commenti

Posta un commento

Post popolari in questo blog

Tomcat Thread Pool configuration

In order to accept incoming requests, Tomcat uses a Thread pool. You can configure two types of Thread Pools: Shared Pool and Dedicated Pool . A Shared pool as the name inplies, can be shared among various components in Tomcat. So, for example if you have three connectors in your configuration, then you can use a single shared pool to serve requests for all of them. Here is how to configure a shared thread pool: Open Tomcat's server.xml file and include the Executor definition: namePrefix="catalina-exec-" maxThreads="150" minSpareThreads="4"/> Once you have added the shared thread pool, you need to reference it in your Connector configuration as follows: namePrefix="catalina-exec-" maxThreads="200" minSpareThreads="4"/> A Dedicated thread pool is a thread pool which is dedicated to only one connector definition. You can use it in a scenario when you are expecting a peak of connections and y...
Posta un commento
More:

Tomcat Websocket example

A WebSocket is a full-duplex communication mechanism that allows both textual and binary messages to be sent between clients and servers, without the HTTP request/response life cycle. WebSockets allow either the client or the server to send a message at any time, providing an asynchronous solution for working with data while the user is performing a task. Websockets API are included in Tomcat 7 Web server distribution so you don't have to download any extra library: In this tutorial we will show how to create a WebSocket example using Apache Tomcat and Eclipse. Start by creating on Eclipse a new Dynamic project named websocket-example : We will now create a server side class named WebSocketDemo that is going to echo messages from a Javascript client: package com . sample ; import java . io . IOException ; import java . nio . ByteBuffer ; import javax . websocket . OnMessage ; import javax . websocket . Session ; import javax . websocket . server . ServerEndp...
14 commenti
More:

tomcat connectiontimeout configuration

Apache tomcat contains a connectionTimeout parameter which defines the amount of time Tomcat will wait for three things: The total amount of time it takes to receive an HTTP GET request. The total amount of time between receipt of TCP packets on a POST or PUT request. The total amount of time between ACKs on transmissions of TCP packets in responses. Changing the connectionTimeout In some cases it might be necessary to increase it especially if the response takes too much to be completed on the server, leaving the connection without a response. To increase the connection timeout on tomcat server follow the following steps : 1. Open the file server.xml residing in TOMCAT_HOME/conf/. 2. Set the variable connectionTimeout in it to Value in Milliseconds.(i.e 1000 milliseconds = 1 second) For example : If  connectionTimeout  is not defined, the default value is 60000 (i.e. 60 seconds); however the standard server.xml that ships with Tomcat sets this to 2...
2 commenti
More: