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How to Set Up an Apple Developer Account for my store app
Before you can have your very own iPhone app on the Apple App Store for your users to download and install into their phones, you will need to distribute your mobile app.
Once you have your apple developer account, you can submit your mobile app to the apple store for the distribution. You can offer users with a free download or charge them...
How do you generate all sizes app icons for ios and android mobile apps?
First, you should have a great design for your icon and file should be in PNG format with size 1024 x 1024 pixels.
Second, use a free online tool like https://makeappicon.com/ or http://appiconmaker.co/ to size down your icon for all different sizes for the Apple App Store or Google Play.
Finally, upload them when you submit the app.
How to sync your cloud with Amazon AWS time by chrony?
For Ubuntu, use apt-get. For REDHAT/CENTOS, use yum.
1. Remove ntp if it is installed.
2. Install chrony and edit chrony.conf
root@myserver:~# apt-get -y install chrony
root@myserver:~# vim /etc/chrony/chrony.conf
3. Comment out the default servers, and add amazon server
server 169.254.169.123 prefer iburst
4. Restart chrony
root@myserver:~# /etc/init.d/chrony restart
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