can i run two tomcat servers on the same linux VM machine

Question

I want to run tomcat 8 and tomcat 9 on my linux VM. Both are intended for different purposes. So is it possible to do so?

Answer 1

Yes its possible. I had installed tomcat 7 and tomcat 8 on my linux VM. You just need to make sure that the port numbers for the two tomcat instances are different.

Comments

Edureka tech support team is trying to install multiple instance of tomcat servers onto two different ports, but sinc almost 1 week they are not able to do the same.  At a given time only one port is working.  Do let us know configuration steps.

Thanks

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Hi@Ganesh,

One port no. can be used by only one program. By default Tomcat server works on port no. 8080. So if one Tomcat server is working on port 8080, then another Tomcat server can't use the same port. So you need to change the port no. of your second Tomcat server. You can follow the below steps. Or you can find lots of documents on google.

• Locate the file server.xml inside the Tomcat configuration folder.
• In server.xml, find a statement similar to the following.

<Connector port="8080" protocol="HTTP/1.1"
   connectionTimeout="20000"
   redirectPort="8443" />

• Change the Connector port=”8080″ port to any other port number.

<Connector port="8181" protocol="HTTP/1.1"
   connectionTimeout="20000" 
   redirectPort="8443" />

• Save the server.xml file and restart the Tomcat server.

Answer 2

Hello @Ganesh,

To run and configure multiple instances in a Single Tomcat Server do follow the steps:

First, you need to download Tomcat(I downloaded the Core .zip file.)

Now unzip the file and rename the folder “Tomcat.” You will get the below folder structure.

Now suppose we want to run two instances on this single Tomcat.

Instance 1: edureka-one

Instance 2: edureka-two

First I want to create the edureka-one instance.

So make a copy of your downloaded Tomcat, and rename the folder  “edureka-one,” and keep only “bin,” “conf,” “logs,” “temp,” “webapps,” and “work” files only.

Now remove all the files from edureka-one/bin. In the “bin” folder of “app-one,” you can add a setenv.sh file to configure the JVM heap setting for that tomcat instance.

setenv.sh

export CATALINA_OPTS="$CATALINA_OPTS -Xms256m"

export CATALINA_OPTS="$CATALINA_OPTS -Xmx1024m"

export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=512m"

Now make another copy of the “edureka-one” folder and rename it “edureka-two.”

Now we have three folders in our directory

1) Tomcat

2) edureka-one

3) edureka-two

Now go to the “Tomcat” directory and delete the “conf,” “logs,” “temp,” “webapps,” and “work” folders. Create a new folder named “controller” inside Tomcat. In the “controller” folder, we will write a script to control all the Tomcat instances. Now, inside our Tomcat folder, we have:

Now we will configure all the Tomcat instances (“edureka-one”, “edureka-two”) to different ports.

Configuration for edureka One

Go to this location, edureka-one/conf/, and open server.xml in edit mode. Suppose we want to run edureka-one in the “7050” port. Here is our configuration:

<?xml version='1.0' encoding='utf-8'?>

<Server port="7005" shutdown="SHUTDOWN">

  <Listener className="org.apache.catalina.startup.VersionLoggerListener" />

  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />

  <Listener className="org.apache.catalina.core.JasperListener" />

  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />

  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />

  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />

  <GlobalNamingResources>

    <Resource name="UserDatabase" auth="Container"

              type="org.apache.catalina.UserDatabase"

              description="User database that can be updated and saved"

              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"

              pathname="conf/tomcat-users.xml" />

  </GlobalNamingResources>

  <Service name="adminApp">

    <Connector port="7050" protocol="HTTP/1.1"

               connectionTimeout="20000"

               redirectPort="7543" />

    <Connector port="7509" protocol="AJP/1.3" redirectPort="7543" />

    <Engine name="Catalina" defaultHost="localhost">

      <Realm className="org.apache.catalina.realm.LockOutRealm">

        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"

               resourceName="UserDatabase"/>

      </Realm>

      <Host name="localhost"  appBase="webapps"

            unpackWARs="true" autoDeploy="true">

        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

               prefix="localhost_access_log." suffix=".txt"

               pattern="%h %l %u %t "%r" %s %b" />

      </Host>

    </Engine>

  </Service>

</Server>

Configuration of edureka Two

Go to this location, app-two/conf/, and open server.xml in edit mode. Suppose we want to run app-two in “7060” port. Here is our configuration:

<?xml version='1.0' encoding='utf-8'?>

<Server port="7006" shutdown="SHUTDOWN">

  <Listener className="org.apache.catalina.startup.VersionLoggerListener" />

  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />

  <Listener className="org.apache.catalina.core.JasperListener" />

  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />

  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />

  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />

  <GlobalNamingResources>

    <Resource name="UserDatabase" auth="Container"

              type="org.apache.catalina.UserDatabase"

              description="User database that can be updated and saved"

              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"

              pathname="conf/tomcat-users.xml" />

  </GlobalNamingResources>

  <Service name="adminApp">

    <Connector port="7060" protocol="HTTP/1.1"

               connectionTimeout="20000"

               redirectPort="7643" />

    <Connector port="7609" protocol="AJP/1.3" redirectPort="7643" />

    <Engine name="Catalina" defaultHost="localhost">

      <Realm className="org.apache.catalina.realm.LockOutRealm">

        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"

               resourceName="UserDatabase"/>

      </Realm>

      <Host name="localhost"  appBase="webapps"

            unpackWARs="true" autoDeploy="true">

        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

               prefix="localhost_access_log." suffix=".txt"

               pattern="%h %l %u %t "%r" %s %b" />

      </Host>

    </Engine>

  </Service>

</Server>

Note that any port number must not conflict with other port numbers.

Now we are going to write startup.sh and shutdown.sh inside the "tomcat/controller" location to start and stop each individual instance of tomcat.

startup.sh

#!/usr/bin/env sh

app_instance=$1;

BASE_TOMCAT=/location-to-tomcat-parent-directory

export CATALINA_HOME=$BASE_TOMCAT/tomcat

export CATALINA_BASE=$BASE_TOMCAT/$app_instance

$CATALINA_HOME/bin/startup.sh

shutdown.sh

#!/usr/bin/env sh

app_instance=$1;

BASE_TOMCAT=/location-to-tomcat-parent-directory/

export CATALINA_HOME=$BASE_TOMCAT/tomcat

export CATALINA_BASE=$BASE_TOMCAT/$app_instance

$CATALINA_HOME/bin/shutdown.sh

Everything is ready now. Copy paste your edureka-one.war file into “edureka-one/webapps” location and edureka-two.war file into “edureka-two/webapps” location and rename both files as ROOT.war .

Now you can start your apps using the following commands:

• ./startup.sh edureka-one 

• ./startup.sh edureka-two 

Our edureka-one URL, http://localhost:7050, and edureka-two URL, http://localhost:7060,

stop apps by using following commands:

• ./shutdown.sh edureka-one 

• ./shutdown.sh edureka-two 

This way, you can run more than one instance in a single Tomcat with different configurations on each instance.

Hope this work!!

Thank you!!!