Ubuntu servers down

Are Rackspace Cloud Ubuntu servers 32 or 64 bit?

Rackspace no longer support 32-bit servers so yours would be a 64-bit.You can check your version using:  uname -rSee the article below: http://www.rackspace.com/knowled...Extract:Warning: 32-Bit Linux operating systems are no longer supported by Rackspace. You will take your own responsibility and risks for downgrading your cloud server to 32-Bit Linux OS. Standard Rackspace Cloud Control Panel features such as "reset root password" may not work after the downgrade. Backing up your Cloud Server before proceeding is highly recommended.We cannot offer technical support for this procedure.

Can a well speced Ubuntu home server be used as a webhost?

Of course, with the following caveats:The main bottleneck will be your ISP. You will need a static IP, and enough upload bandwidth to serve the pages. Be wary of the myriads of search engines that will crawl your site and impose a high load on your server and connection.You will get attacked constantly, so you need to invest some time understanding how to secure a site, installing and configuring things like fail2ban and have enough monitoring in place to detect intrusions. And try to isolate your home server from the rest of your home network in case the worst happens.Your server may be down from time to time: power outages, internet outages, moving, hardware failures and upgrades, …You will have to wonder if it is worth it, knowing that a good linux (virtual) server can be run for $5/month or less at places like SSD Cloud Hosting & Linux Servers or Dedicated Root Server, VPS & HostingI have been running a Debian server from home for more than 15 years, but I only host things there privately for the family and a small amount of friends. All my public activity (email, wiki, source code server, …) is done on a $5/mo linode server.Any linux distribution will be OK, as long as you are familiar with it.

How do you firewall an Ubuntu server to only allow connections to a port from a specific IP?

The easiest (and most Ubuntu-like way) of doing this is to use ufw ("Uncomplicated Firewall", https://help.ubuntu.com/communit...). This is essentially a wrapper around iptables to make administration a bit simpler for the average user.To do this with ufw, first make sure it isn't going to disconnect your SSH session (assuming you're using SSH on the default port [22]) when you enable it with:ufw allow ssh(You need to do this as root, either with su or sudo as I'm sure you know).Next, set the default policy to reject everything unless you've explicitly allowed it:ufw default denyThen, add your rules to allow the connection you want with:ufw allow from 127.0.0.1 to 127.0.0.1 port 11211 proto tcpufw allow from 192.168.5.123 to 127.0.0.1 port 11211 proto tcpFinally, enable ufw by issuingufw enableYou can check the status of ufw and see the rules you have setup at any time withufw status

Why is my website server down after a day its 4th time during our last check at 10:24 pm? How do I fix it?

If your website is down very often, then following are the potential reasons. I assume, you use some Linux servers such as Centos or Ubuntu.A server can go down for many reasons.Too many spam/junk hits coming from china/russia or other places.You can avoid them by installing and configuring the csf firewall or keep your servers behind the firewall.Too many hits may come, When bots are trying to hack your password of smtp/email/admin passwordsThis is screenshot of admin section of csf firewall. You can read more from this link, How to Enable/Disable Firewall (about configure and setup)Heavy loads on the serverServer or SSH or remote access of the server become inaccessible due to heavy load on the server. In this link, We have explained about server load in detail and also, How mitigate the problem and reduce the load on the server.Due to high CPU use by processors such as Apache or MySQL, or mail serverHacked or rooted or malware injected servers takes more loadLike, the server exceeding the assigned resource limit, server crash, bug in the application, DNS issues, network issue,Connection issues between ISP and Server, IP block in server firewall etc. Verify if the server accessible from the backend when the website goes offline.You can install SAR (stands for System Activity Report ) in Linux server to monitor the server resource usage details.In windows you can use Performance Monitor. If you are using VPS/Cloud/Dedicated server, check the server error logs. If any issue with server resource usage, you have to find out which service taking the more resources and optimize the same to reduce the usage or consider an up gradation as per the resource usage.If there is any network issue, You can use ping traceroute or mtr command to check the server response details.These command show you the connectivity information from your local system to the server. If there is any network issue, contact your service provider.These kind of issues should be taken care by the hosting company when you have opted for managed hosting servers. HostingRaja provides managed hosting solution, these kind of issues are taken care by their support team.