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October 23

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 or 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. ...

October 23

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 prefer iburst 4. Restart chrony root@myserver:~# /etc/init.d/chrony restart ...

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