Redundant Apache (failover System)
I currently own several servers: let's say sites on 3 of those servers rely on a website that sits on server 4
If server 4 goes offline, then servers 1 2 and 3 suffer a lack of usability.
The website on server 4 is very small and fast, but receives several hundred thousand visits a day
I figured it would be a good idea to replicate that website on each of my servers, but I'm unsure about how to set up a good redundancy system..
Using several nameservers doesn't work as expected (visitors are randomly sent to one of the nameservers, in no particular order)
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I run a site with about 1,000,000 unique visitors per month and recents server failures made me decide to get a failover server to minimize downtime. My goal wasn't to get 99.999% uptime but to be able to be back on track after a failure in a "reasonable" amount of time. After evaluating several solutions, I decided to go with DNS failover. Here's how the setup work: 1) mydomain.com points to main server with a very low TTL (time to live) 2) failover server replicates data from main server 3) when main server goes down, mydomain.com is changed to point to failover server The drawback is the DNS propagation time since some DNS servers don't honor the TTL and there is some caching happening on the user's machine and browser. I looked for empirical data to gauge the extent of the problem but couldn't find any so I decided to setup my own experiment. The Experiment ============== I start with mydomain.com pointing to the main server with a TTL of 1800 seconds (1/2 hour). I then change it to point to the failover server which simply port forwards to the main server. On the main server, I periodically compute the percentage of requests coming from the failover server which gives me the percentage of people for which the DNS change has propagated. I made the DNS change at exactly 16:04 on 06/21/06 and here are the percentage of propagated users: 06/21/06 16:00 0 % 06/21/06 16:05 3 % 06/21/06 16:10 20 % 06/21/06 16:15 37 % 06/21/06 16:20 59 % 06/21/06 16:25 69 % 06/21/06 16:30 76 % 06/21/06 16:35 80 % 06/21/06 16:40 86 % 06/21/06 16:45 90 % 06/21/06 16:50 91 % 06/21/06 16:55 92 % 06/21/06 17:00 93 % 06/21/06 17:05 94 % 06/21/06 17:10 94 % 06/21/06 17:15 95 % 06/21/06 17:35 95 % 06/21/06 17:40 96 % 06/21/06 17:45 97 % ... 06/22/06 10:40 99 % So even after 18 hours, there is still a certain percentage of users going to the old server so DNS failover is obviously not a 99.999% uptime solution. However, since more than 90% of the users are propagated in the first hour, the solution works well enough for me.
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"failover" With Hosted Servers
I have a client that had an "electrical" problem with his hosting service, and all his sites were down for more than 1 week. Is there any chance to create some sort of backup servers, on different hosting companies with a service that offer a mechanism of ip redirect in case of main-server failure? Or is there any "cheap" solution for this?
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Power Supplies: Do Redundant Supplies Use More Power Than A Single Supply
do dual power supplies use more power than a single supply? E.g. Say I have a server than uses two amps, powered by a single power supply. Now if I switch to a dual supply (and say each supply has the same efficiency rating as the single), does my server use more power? How much more? My simple view of this is that it probably does, but maybe not much. The second power supply consumes some power itself, but since its not under load, it doesn't consume much. Therefore, my server with redundant supplies might use 2.1A or 2.2A.
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Slow System
Recently, my server has been running real slow and I don't know why... I've not noticed any increase in traffic (In fact it goes slow with no traffic on it...), what are some things I can look at to try and diagnose the problem? I know next to nothing about *nix so please speak in great detail. Anytime I restart Apache, it loads quick for a few seconds then gets slow again... Here are the top few processes listed on the process manager: .....
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