Difference between revisions of "2 Server Redundant Solution"
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[[Image:2_redundant_with_linuxha.jpg]] | [[Image:2_redundant_with_linuxha.jpg]] | ||
'''Network setup''' | |||
* Best scenario when both servers are on same LAN (subnet). | |||
* If servers are on different LANs (subnets), VPNs between those servers have to be configured. Drawback - such setup | |||
management becomes too complicated. | |||
* If servers are in the different countries (continents), it might cause latency problems which has negative influence on the speed of retrieving/instering data to the DB (loading statistics, trying to retrieve some data, searching for a sound file, etc. will longer than usually). <br><br> | |||
'''Workflow''' | |||
* Both servers (S1 and S2) are identical. | * Both servers (S1 and S2) are identical. | ||
* Both of them have two network interfaces - one for [http://en.wikipedia.org/wiki/Virtual_IP_address Virtual IP] which is visible from outside, and one for local IP for interconnection (heartbeat monitoring, MySQL Replication) | * Both of them have two network interfaces - one for [http://en.wikipedia.org/wiki/Virtual_IP_address Virtual IP] which is visible from outside, and one for local IP for interconnection (heartbeat monitoring, MySQL Replication) | ||
Revision as of 14:40, 7 February 2012
Network setup
- Best scenario when both servers are on same LAN (subnet).
- If servers are on different LANs (subnets), VPNs between those servers have to be configured. Drawback - such setup
management becomes too complicated.
- If servers are in the different countries (continents), it might cause latency problems which has negative influence on the speed of retrieving/instering data to the DB (loading statistics, trying to retrieve some data, searching for a sound file, etc. will longer than usually).
Workflow
- Both servers (S1 and S2) are identical.
- Both of them have two network interfaces - one for Virtual IP which is visible from outside, and one for local IP for interconnection (heartbeat monitoring, MySQL Replication)
- DB are synchronized over MySQL Replication
- LinuxHA heartbeat monitors servers, e.g.
- When S1 fails - S2 sees that and after 10s (default) will take Virtual IP, e.g. will start to serve calls, it is done automatically
- When S1 is back up - S2 returns Virtual IP to S1 and system starts to function in normal work flow (done automatically).
- VPN is necessary between servers if they are not on the same LAN
