Re: Queries related to Tomcat Web Servers for which a new web-application needs to deployed on Production Environment
Hai Mark, For your valid comment please for one more point mentioned in the trail mail.. On Tue, Jan 29, 2019 at 4:11 PM Vinu Vibhu Sobhana wrote: > > Hai Mark > > One more small clarity required on the previous reply with respective > to the below point. > > You can use the FarmWarDeployer if you wish but you don't have to. > Generally, the right answer here will be driven by how your organisation > manages files on servers. > > Ok..If Iam having a load-balancer serving 2 tomcat instances configured > with autoDeploy="true" and unpackWARs="false" in their server.xml > respectively, running on two separate VMs. Also, Iam having a common > share such as NFS folder mounted on both servers. This share folder > contains a single folder named prod_webapps which contains all the > required application war files that needs to be deployed on both tomcat > servers. > > Can I have this prod_webapps folder soft-linked to both > tomcat1/webapps folder and tomact2/webapps folder, so that we can have > a centralized webapps deployment folder. Is this possible? Will this > scenario feasible for Production deployment? > > Thank You > Vinu VS > > On Tue, Jan 29, 2019 at 3:43 PM Mark Thomas wrote: > > > > On 29/01/2019 06:56, Vinu Vibhu Sobhana wrote: > > > Hai Mark, > > > > > > Please find my comments on the reply sent earlier as some points are > > > still remain unclear. > > > > > >> I have been assigned a new project that requires a web application to > > >> be hosted using Tomcat-Cluster, as it is expected to receive high > > >> traffic. > > > High traffic may be a justification for load-balancing. It is not a > > > justification for session replication. > > > > > Since we would be receiving high traffic it was decided to go with > > multiple instances of tomcat using a load-balancer. > > > > > > Why 2 instances per VM rather than one larger instance per VM? > > So for this point it is understood that it is best that we put only > > one instance per VM (with large hardware resource). Iam I correct. > > Will the same scenario be applicable while using physical machine. ie > > one Tomcat instance per machine. What about the resource limitation > > (ie. any memory allocation pool for a JVM, etc.) required that must be > > noted. > > > > The right configuration will depend on the app. Generally, for a well > > written app one JVM per VM will be the best choice but only testing will > > tell for sure. > > > > >> Point 1 > > > Don't use any clustering at all. > > > > > This point was not clear at all. Are you suggesting that we configure > > Tomcat instances without cluster and configure the load balancer with > > session management and stickiness features to manage sessions?? > > > > Yes. Don;t use clustering unless you really need it. > > > > >> Point 2 > > > N/A since clustering is not required. > > > > > If clustering is required for other scenarios, then please comment on > > this point how should we deploy applications using Tomcat Manager App > > on FarmWarDeployer folder > > > > You can use the FarmWarDeployer if you wish but you don't have to. > > Generally, the right answer here will be driven by how your organisation > > manages files on servers. > > > > >> Point 3 > > > No. > > This means that there is mo method to collect the errors for > > individual domain when VirtualHost element is enabled. If there is any > > work-around please suggest. Also will the catalina.out log contains > > errors for these VirtualHost element? > > > > There is no workaround. > > > > A well written application should not be writing anything to catalina.out > > > > >> Point 8 > > > Configure the load-balancer to use sticky sessions. You'll need to do > > > that anyway if clustering is removed. > > > > > With respect to my project specification mentioned in point 8, you > > have suggested to go with a load-balancer serving 2 tomcat instances, > > each running on two separate VMs with enough resources. Moreover, > > these tomcat instances are NOT to be in Clustered State and the > > session must be managed by an external Load-balancer using Stick bit > > mode enable. Is it correct?. > > > > Yes. > > > > > Is Tomcat CPU intrinsic or Memory? > > > > I don't understand the question. > > > > Mark > > > > > -- > > > Thank You > > > Vinu VS > > > > > > > > > On Mon, Jan 28, 2019 at 3:00 PM Mark Thomas wrote: > > >> > > >> On 28/01/2019 07:25, Vinu Vibhu Sobhana wrote: > > >>> Hai > > >>> > > >>> First of all Iam new to Tomcat-Cluster and hence I apologize if my > > >>> doubts are wrong. > > >>> > > >>> I have been assigned a new project that requires a web application to > > >>> be hosted using Tomcat-Cluster, as it is expected to receive high > > >>> traffic. > > >> > > >> High traffic may be a justification for load-balancing. It is not a > > >> justification
Re: Queries related to Tomcat Web Servers for which a new web-application needs to deployed on Production Environment
On 31/01/2019 11:45, Vinu Vibhu Sobhana wrote: > Hai Mark, > > For your valid comment please for one more point mentioned in the trail mail.. > > > On Tue, Jan 29, 2019 at 4:11 PM Vinu Vibhu Sobhana wrote: >> >> Hai Mark >> >> One more small clarity required on the previous reply with respective >> to the below point. >> >> You can use the FarmWarDeployer if you wish but you don't have to. >> Generally, the right answer here will be driven by how your organisation >> manages files on servers. >> >> Ok..If Iam having a load-balancer serving 2 tomcat instances configured >> with autoDeploy="true" and unpackWARs="false" in their server.xml >> respectively, running on two separate VMs. Also, Iam having a common >> share such as NFS folder mounted on both servers. This share folder >> contains a single folder named prod_webapps which contains all the >> required application war files that needs to be deployed on both tomcat >> servers. >> >> Can I have this prod_webapps folder soft-linked to both >> tomcat1/webapps folder and tomact2/webapps folder, so that we can have >> a centralized webapps deployment folder. Is this possible? Will this >> scenario feasible for Production deployment? That is likely to be problematic if automatic deployment is enabled. If you must use softlinks, just soft-link the WAR. Personally, I would just copy the files. Mark >> >> Thank You >> Vinu VS >> >> On Tue, Jan 29, 2019 at 3:43 PM Mark Thomas wrote: >>> >>> On 29/01/2019 06:56, Vinu Vibhu Sobhana wrote: Hai Mark, Please find my comments on the reply sent earlier as some points are still remain unclear. > I have been assigned a new project that requires a web application to > be hosted using Tomcat-Cluster, as it is expected to receive high > traffic. High traffic may be a justification for load-balancing. It is not a justification for session replication. >>> Since we would be receiving high traffic it was decided to go with >>> multiple instances of tomcat using a load-balancer. Why 2 instances per VM rather than one larger instance per VM? >>> So for this point it is understood that it is best that we put only one >>> instance per VM (with large hardware resource). Iam I correct. Will the >>> same scenario be applicable while using physical machine. ie one Tomcat >>> instance per machine. What about the resource limitation (ie. any >>> memory allocation pool for a JVM, etc.) required that must be noted. >>> >>> The right configuration will depend on the app. Generally, for a well >>> written app one JVM per VM will be the best choice but only testing will >>> tell for sure. >>> > Point 1 Don't use any clustering at all. >>> This point was not clear at all. Are you suggesting that we configure >>> Tomcat instances without cluster and configure the load balancer with >>> session management and stickiness features to manage sessions?? >>> >>> Yes. Don;t use clustering unless you really need it. >>> > Point 2 N/A since clustering is not required. >>> If clustering is required for other scenarios, then please comment on >>> this point how should we deploy applications using Tomcat Manager App >>> on FarmWarDeployer folder >>> >>> You can use the FarmWarDeployer if you wish but you don't have to. >>> Generally, the right answer here will be driven by how your organisation >>> manages files on servers. >>> > Point 3 No. >>> This means that there is mo method to collect the errors for individual >>> domain when VirtualHost element is enabled. If there is any work-around >>> please suggest. Also will the catalina.out log contains errors for >>> these VirtualHost element? >>> >>> There is no workaround. >>> >>> A well written application should not be writing anything to catalina.out >>> > Point 8 Configure the load-balancer to use sticky sessions. You'll need to do that anyway if clustering is removed. >>> With respect to my project specification mentioned in point 8, you have >>> suggested to go with a load-balancer serving 2 tomcat instances, each >>> running on two separate VMs with enough resources. Moreover, these >>> tomcat instances are NOT to be in Clustered State and the session must >>> be managed by an external Load-balancer using Stick bit mode enable. Is >>> it correct?. >>> >>> Yes. >>> Is Tomcat CPU intrinsic or Memory? >>> >>> I don't understand the question. >>> >>> Mark >>> -- Thank You Vinu VS On Mon, Jan 28, 2019 at 3:00 PM Mark Thomas wrote: > > On 28/01/2019 07:25, Vinu Vibhu Sobhana wrote: >> Hai >> >> First of all Iam new to Tomcat-Cluster and hence I apologize if my >> doubts are wrong. >> >> I have been assigned a new project that requires a web application to >> be hosted
