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• where to put core services in two-node cluster

  - by Veniamin

  I'm currently configuring two-node HA cluster based on CentOS with DRBD. Most services are packed in virtual machines with migration available. I have not made decision where to put some core services as: dhcp, ldap, dns - which are critical for all network infrastructure. There are two possibilities: Configure them as redundant HA services on cluster hosts. Pack them all into dedicated virtual machine. What is the best practice?

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• Spring Web application internal visual monitoring heap space and permgen.

  - by Veniamin

  If I have created web application used Spring framework(based on maven), can I include some module/dependency/plugin into my app to monitor Heap space, Permgen, etc. It whould be greate to get some charts output likes as in VisuaVM. For example: http://localhost:8080/monitoring = Including something likes VisualVM I have found next dependency without link to repo: <dependency> <groupId>com.sun.tools.visualvm</groupId> <artifactId>core</artifactId> <version>1.3.3</version> </dependency> How to use it?

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