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I have developed an app which talks to a sql database on a server. I have just arranged with a server company to host my sql database and in setting it up have asked how many public ip's do i need.
The application will be used by 10/20 companies each having approx 10-20 ipads / android tablets. There will also be a website they can log onto to again look at the data on the server.
How many public ip's would i require, or what factors do i need to consider when deciding.
I should add if you haven't already worked it out, know nothing about servers.
The number of ip address wouldn't matter that much if you don't need them. When will you need them?
When you want to add an extra layer of separation between companies (each its own ip)
More ip addresses means more DIFFERENT connections (so failover)
More ip addresses means more SIMULTANEOUS connections (so more possible users)
You want to have extra maintenance ;)
Just to mention a few
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I created an instance in Oracle cloud. By mistake I forgot to assign public IP. I have to connect that instance with Putty so I need public IP for this instance.
Can anybody please suggest me how to assign the IP? Oracle docs is not helpful.
Have a look at this blog, it shows you how to add a public IP. Basically, you go the the VNIC, IP addresses part (on the left part of the screen there's a link to it), then choose edit in the menu (click on the 3 dots on the right), there you can choose to add an ephemeral public IP.
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I am running a website running on Django,Postgres and Apache.
Recently, due to sudden surge in traffic the site came down. On checking server logs i came to know that there was some issue of maximum connections limit exceeded. On looking up more i found out that in postgresql.conf , the parameter max_connections affects the simultaneous connections, that can be made at any point of time, to the DB.
The current value in my postgresql.conf is 100.
The event that happened and brought site down is not a commonly occuring event but i want to be prepared the next time it happens again.
So i am seeking advice for how can i monitor the active connections at any moment on a regular day and to how much i should increase the value of max connections and what other parameters need to be changed parallely as i was seeing that i have to increase other values in postgresql.conf accordingly(like shared buffers etc).
Please take a look at the relevant wiki article: http://wiki.postgresql.org/wiki/Number_Of_Database_Connections
In general it's best not to bump max_connections up too much. Use a connection pool like PgBouncer, or a pool inside your server, instead.
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I need a server with a lot of RAM, around ~1TB, for a GIS DB, that would be not written to hard disk, because the data is irrelevant after a few seconds. So I do not need a lot of disk space; I wish to hold all data in memory. The write data would be 1% of INSERT'S and 99% of UPDATE's. Write/Read ratio would be 20/1. I have to choose to rent a dedicated server or rent an Amazon service. I'm wondering: how to calculate the price of Amazon services with traffic ~100TB/month.
I think you might reconsider your configuration, using SSD disk, a really great CPU, and a lot of ram, but 1To of ram is way too much, most system will not handle it. After it's for the price ! It's really expensive, that kind of configuration is 15000$++ a month at OVH for example. So I thinks if you have that kind of problem, the better is to directly call Amazon and ask them for the best configuration and negociate the price.
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I'm not sure if this is the best SE site for this question but here goes.
I am looking to implement a simple and easy to use file transfer solution such that people can upload/download files with resume support to our office server (which does not have a static IP address).
So far, I have come across free FTP servers (such as FileZilla) and free DNS routing services (such as dyn) that allow this but I am sure there are simpler solutions out there.
Commercial solutions are welcome as long as non-technical people can administer them.
UPDATE: The data transfer per day is around 10GB and although Dropbox is fine for personal use, I'd rather use a more robust application that allows more control and acceleration. Any ideas would be appreciated.
It seems you have two different problems.
lack of a permanent ip address. This is solced by free dynamic dns services.
second: resumable tranfer. Ftp is Not o good one.
You should try google drvie or dropbox
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I have a two server machines on which I have installed Linux servers.I want to host one website with the two both machines.When there is congestion in one machine the user should be directed to the machine.Both the machines should have one database interloped together.I want both machines to share resources equally.In case of failure of one machine the other machine should continue working and the user should not notice the change.Is there any way I can change the files for those machines to work simultaneously?
You may use a load-balancer top of your app-servers. See http://tomcat.apache.org/connectors-doc/generic_howto/loadbalancers.html
You can have DB on one of those machine and allow the user from the other-machine to have RW access to the schema of your app.
There is a fail-over setting in load-balancer you probably need to dig out to redirect all the traffic in case one of your servers goes boink.
I have moved to AWS long back, these stuffs are really easy to do with ELB.