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| //// |
| |
| [[ops-mgt]] |
| = Operational Management |
| :doctype: book |
| :numbered: |
| :toc: left |
| :icons: font |
| :experimental: |
| |
| This chapter will cover operational tools and practices required of a running DCS cluster. |
| The subject of operations is related to the topics of <<troubleshooting,troubleshooting and debugging>>, <<performance,performance tuning>> |
| and <<configuration,configuration>> but is a distinct topic in itself. |
| |
| [[tools]] |
| == Tools and Utilities |
| Here we list tools for administration, analysis, and debugging. |
| |
| [[client-server-connectivity]] |
| === DcsMaster and mxosrvr unable to communicate via the interface specified in _conf/_dcs_site.xml_ |
| Symptoms are: When connection are viewed using DCS webUI, the server will be in "CONNECTING" state and the state does not change to "CONNECTED". |
| |
| When such issues are seen, validate network communication works by using the linux utility 'netcat(nc)'command. |
| ---- |
| From the first node, type 'nc -l <any port number>'. This utility is now running in server mode listening for incoming connections on the specified port. |
| |
| From the second node, type ‘nc <external IP of the first node> <the listening port specified on the first node>’. |
| Start entering some text on the client node and hit enter. The message you typed should reach the server on the first node. |
| |
| To exit , Press Ctrl-D , both the client and server will exit. |
| ---- |
| |
| Another test would be to enable verbose when using ssh by using the public or private IP address |
| ---- |
| ssh -v <private IP address OR public IP address> |
| ---- |
| |
| The third test would be to use linux tool 'traceroute' |
| ---- |
| traceroute <privateIP or public IP address> |
| ---- |
| |
| |
| |
| |
