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There are several ways to install diff-versioned software on the same server but (I think) the best variant is packing your application into different Docker containers.


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The problem is Tomcat waiting for entropy to build up. Try add the following system property: -Djava.security.egd=file:/dev/./urandom See: Tomcat7 hangs on deploying apps


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You are right, Jelastic Maven does not support parallel deployment in Tomcat at the moment. The feature request was added to the enhancements list. As an alternative option for now, you can deploy a war archive via direct SSH connect to a container. Or you can play with swap domain - create a new environment, deployment a new version to this new env, test it ...


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If nginx is running, but cannot connect to its upstream server, e.g., to tomcat, then you'd be getting a 50x-style error, NOT a connection refused one. Browser reports site refused to connect. ERR_CONNECTION_REFUSED – Chethan S. Apr 21 at 15:34 This means that you cannot connect to nginx in the first place. Are you sure it is running? Best way to ...


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Tomcat 7 documentation clearly states that the sslEnabledProtocols and sslProtocol options are suppported and that there is an overlap between them: https://tomcat.apache.org/tomcat-7.0-doc/config/http.html


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Couldn't you implement Spring Session backed by a replicated redis cluster on both Node A and B? If you then configure both nginx instances to load balance over all 4 tomcat instances then you can shutdown or crash any tomcat server at any time and nginx will just use the next server to serve your request? This is assuming Node A and B can connect to all 4 ...



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