Correcting Wrong CPanel’s Nameservers IPs
On CPanel 11.30+ when you go to "Main >> DNS Functions >> Nameserver IPs" and found that the nameservers listed is wrong (this might happen if you just finished doing server migration), you can fix it by following these steps:
1. Make sure that you already update the child nameservers to the new IPs and its fully propagated.
2. Go to "Main >> Server Configuration >> Basic cPanel & WHM Setup" and click on "Assign IP address" button on each of your nameservers. Make sure that the IP being shown on the pop-up window are the correct IP for your nameserver.
3. Login to your server as root and run the script: /usr/local/cpanel/scripts/updatenameserverips to update CPanel nameservers list.
4. Check "Main >> DNS Functions >> Nameserver IPs" again and it should show the correct settings.
Can’t Create or Write on /tmp With Error: No space left on device
I just got a problem with writing error on /tmp on one of my client server. The strange problem is that df -h command shows that /tmp only 35% used so there should be plenty of space to write on.
After some investigation it seems that the /tmp partition hit the number of files limit due to caching files from nginx filling up /tmp, hence it's not possible to create new files. This problem cause PHP scripts on Cpanel server to show error regarding session as by default Cpanel installation, PHP session are written in /tmp.
Clearing nginx cache files seems to fix the problem. To prevent this from happening again I setup a cron job to clear nginx cache regularly.
Top 5 VoIP Apps for Business
Voice over Internet Protocol (VoIP) is a powerful tool for the modern business because it facilitates telephone communication via the Internet. VoIP is convenient, versatile and cost-effective. Many users connect to VoIP services using an app, which allows them to make a VoIP call from their iPhone, Android or BlackBerry smartphone. In this article, we examine the top five app-based VoIP options.
1. TringMe
TringMe is the most comprehensive and powerful VoIP solution on the market. TringMe is coming soon for iOS, is currently available for Android, and it’s one of many native BlackBerry.com business services with BlackBerry smartphones. Using an Internet connection, TringMe allows you to make calls from anywhere to anywhere, and all calls between mobile users are free. TringMe is perfectly suited to the individual, but it’s a popular option among businesses because of an extensive API that allows for integration into business systems.
2. Skype
Skype is the most widely used VoIP solution in the world, and there’s a Skype app available for iOS, Android and BlackBerry OS, including BlackBerry PlayBook OS as of version 2.0. Skype’s best feature is its call clarity, although TringMe is close. Another benefit is its popularity. If you need help, it’s a little bit easier to get it when using Skype. Skype doesn’t offer as many free options as TringMe does, and from a business perspective, the service is not as easy to integrate.
3. TruPhone
The TruPhone app is available for BlackBerry, Android, Apple and a wide range of other devices, and for the casual BlackBerry user, it’s a solid alternative to default business services with BlackBerry devices. TruPhone also provides excellent rates for local and international calls. It also doesn’t matter if one is calling to a mobile, so it can be more cost-effective than TringMe in some scenarios.
4. Axvoice
Axvoice is a full-featured VoIP service, and it’s able to provide a high level of customer service, even to its smallest residential clients. Axvoice also has comprehensive business services, and it’s probably a better choice than TringMe, Skype and TruPhone for the business that requires a vendor relationship. Axvoice can handle integration, and it can even develop personalized app solutions.
5. Fring
Fring is a direct competitor to Skype in that it emulates that service. If a Skype-like service is the right choice for a business, then Fring does offer some benefits in some scenarios. For instance, Fring has a non-contract per-minute charging structure, which Skype does not. Fring is also a SIP (session initiation protocol) client, which makes it a better option than Skype in some environments.
Fix: That Account Has Already Been Added Error on Android HTC Desire HD
After updating my HTC Desire HD to HTC Sense 3.0 I can't login anymore to Twitter app 2.1.2 with error message "That account has already been added". I tried to update the Twitter app to version 3.0.0 but still got the same problem.
A quick Google search found a page on Twitter help center that mentioning a known bug/issue with the same error message as I got. Following the suggestion I uninstalled the update version 3.0.0 and restart my device, alas it doesn't fix it. I'm stuck with Twitter version 2.1.2 and can't uninstall it as it's embedded on HTC sense.
Then I tried to login using another Twitter account which I didn't added yet to my phone and it works, I can login. It turn out that the problem was on "Accounts & sync" settings, the Twitter sync setting had a problem with login, so the steps that I take to fix it:
1. Go to Settings > Accounts & sync
2. Tap on the Twitter account
3. Tap on Remove account
4. Go to Twitter app and try login again
Those steps should fix the problem and you don't need to reboot your phone.
High Capacity 2430mAh for HTC Desire HD is Fake
I have HTC Desire HD Android smartphone which is a great phone, I really love its big screen which make working with it is easy and pleasant. However, the big screen also have its negative impact to battery life. The original battery from HTC only have 1230mAh which hardly last for 1 day on normal usage. My normal usage would be: short phone calls, SMS, automatic email checking, chatting and play scrabble.
Last month I browsed eBay to look for a spare battery and found some seller sold 2430mAh high capacity battery for HTC Desire HD. By the number it should double the life battery expectancy. Interested, I bought one of them from a Hongkong seller. The Delivery was fast, it took 7 working days to arrive in the Netherlands.
Unfortunately the battery doesn't deliver as I expect it would. The battery life is only 1 day, same with the original battery. But for US$ 10 with free shipping I wouldn't complaint, I was pessimistic when bought it but decide to buy it anyway. Well.. at least I have spare battery now 
What does 4G mean and what’s next?
"4G" is advertised by many mobile phone providers and is an indicator of how fast the connection speeds are on mobile phones and tablets. 4G actually stands for 4th generation cellular network hardware. Implementing 4G has been a revolutionary mark for providers. The hardware and software required to obtain speeds that should be able to reach as high as 20 mb/s when completely implemented. The technology for the speeds varies based on which provider you ask.
The most common term is LTE, which stands for Long Term Evolution. Another software, known as WiMax, which stands for Worldwide Interoperability for Microwave Access, is comparable to LTE and also enhances speeds that rival common Internet Providers as it compares to current Wi-Fi speeds. You may also hear about HSPA+, which stands for High-Speed Packet Access, and is really a glorified improvement to 3G connections under the mask of 4G speeds but has potential to reach the same speeds when the full hardware is rolled out by providers.
With all these advances technological terms you really probably only want to know what the best deal for your money is and where you can get the fastest speeds. Coverage for 4G networks is limited by provider and typically only available in larger cities, although it is expanding and expected to reach more areas as its popularity increases.
Since the rage is all about 4G you may be wondering what comes after this. Well, technically it will be 5G but really shouldn't be a concern at the moment. 4G still needs to expand to cover more areas and customers and once coverage is expanded it needs to be perfected to allow devices to get optimal speeds. It still has a long way to go before it can be utilized by the mainstream mobile phone user, but has significant potential to replace primary internet providers.
Minimum Install VNC Remote Desktop Server on Centos
I wrote an update for an article that i wrote a couple months ago here It's a tutorial to install VNC on Linux Centos VPS. On that tutorial I was installing the group package of Gnome Desktop which will install all Gnome's applications including Open Office. This of course requires a lot of space and RAM resources to be run on a VPS which most of the time we don't need Open Office etc.
My self only use the VNC server that I installed in a VPS located in US datacenter to access some website which only available for US visitors. For browsing purposes I only need Gnome minimum install and Firefox browser and that is what I installed on this tutorial.
You can read my tutorial here: Minimum Install VNC Remote Desktop Server on Centos
Wireless modems vs wireless hotspots
More and more, we are getting used to the idea of being able to access the Internet no matter where we are. With the spread of smart phones and tablet devices, coupled with the ever-expanding 3G and 4G wireless networks, it seems like people are constantly connected. However, while you can always rely on 3G and 4G outside of your home, you also have to figure out what kind of wireless connection best suits your home environment. Basically, there are two options: you can purchase a wireless internet hotspot, or invest in a wireless modem, and both will keep you connected inside of your home. The following is a brief comparison (based on data from wirelessinternet.net) to help you choose between the two, if you are looking to set up your home with a wireless network.
Wireless Modem – If your home has already had a wireless Internet connection for a few years, you are likely using a wireless modem. These are the popular modems you have likely seen in people’s houses that are usually about the size of a book, with small antennae and a plug that goes into a normal outlet. The downside of these machines is that they do have to be plugged into a home outlet, meaning that they provide wireless connection within your home, but no further, and they are not portable. However, they do provide quick and reliable wireless internet connection for multiple devices at once.
Wireless Hotspot – Perhaps an increasingly common tool for wireless Internet service, the main benefit of a wireless hotspot is that it is portable, usually pocket-sized. These hotspots bring you a wireless connection using the 3G and 4G networks, meaning that you will be able to connect wherever these networks are present. For many people, this portability is the most important feature of a wireless internet provider. However, because of its smaller size and dependence on the 3G and 4G wireless networks, a wireless hotspot has limits in terms of data storage; also, it does need to be charged from time to time.
There is not necessarily a right answer between these two different wireless providers. But before you invest in one or the other, it is prudent to do a bit more research and figure out for certain which one will better suit your needs. The above comparison lists the basics for you, but you may want to give a closer look to the similarities and differences between them, and the benefits that each one offers. Either way, you will soon be connected to a quick and reliable wireless network.