Category Archives: Operating Systems

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12
01
25
 5 Comments

Connecting to OpenVPN from an Android device

Posted by | Ubuntu | Tagged , |

I cloned repository https://github.com/dockovpn/dockovpn and updated config/server.conf to increase the server log verbosity by setting verb to 4:

port 1194
proto %HOST_TUN_PROTOCOL%
dev tun
ca /etc/openvpn/ca.crt
cert /etc/openvpn/MyReq.crt
key /etc/openvpn/MyReq.key
dh /etc/openvpn/dh.pem
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 208.67.222.222"
push "dhcp-option DNS 208.67.220.220"
duplicate-cn
keepalive 10 120
cipher AES-256-GCM
ncp-ciphers AES-256-GCM:AES-256-CBC
auth SHA512
persist-key
persist-tun
status openvpn-status.log
verb 4
tls-server
tls-version-min 1.2
tls-auth /etc/openvpn/ta.key 0
crl-verify /etc/openvpn/crl.pem
(more…)
29
12
24
 1 Comment

Installing Windows Sandbox

Posted by | Windows |

In addition to enabling Sandbox (a special purpose limited container) you also need to enable Windows Hypervisor Platform and also Virtual Machine platform:

13
12
24
 Leave a comment

My Android Phone requires release apps to be signed

Posted by | Android |

When I try to install an unsigned release app 

adb install android-build-release-unsigned.apk

I get 

Performing Streamed Install
adb: failed to install android-build-release-unsigned.apk: Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES: Failed to collect certificates from /data/app/vmdl827870317.tmp/base.apk: Attempt to get length of null array]
(more…)
26
10
24
 3 Comments

Viewing image metadata on Ubuntu 22.04

Posted by | Ubuntu | 
sudo apt install imagemagick
identify -verbose my-image.jpg
(more…)
11
10
24
 1 Comment

Converting MP4 to GIF with ffmpeg

Posted by | Ubuntu | Tagged |

I was able to convert MP4 to GIF with ffmpeg with the following commands on Ubuntu 22.04:

ffmpeg \
  -i iphone884.mp4 \
  -r 15 \
  -vf "scale=512:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
  -ss 00:00:03 -to 00:00:06 \
  iphone884.gif

ffmpeg \
  -i iphone884.mp4 \
  -r 15 \
  -vf "scale=300:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
  iphone884.gif
20
09
24
 13 Comments

The right way to build Yandex Mobile Ads Example for iOS

Posted by | Mac OS X | Tagged |

To build the example with CocoaPods do the following steps:

Install build tools

Install Ruby with rbenv on macOS and install CocoaPods without sudo:

gem install cocoapods
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20
09
24
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Installing Ruby with rbenv on macOS

Posted by | Mac OS X |

Install Homebrew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Install rbenv

brew install rbenv
(more…)
19
09
24
 2 Comments

Installing latest Ruby version on MacOS Sonoma with Homebrew

Posted by | Mac OS X |

Determining how was Ruby Installed.

I have system Ruby:

% which -a ruby

/usr/bin/ruby

ruby -v

ruby 2.6.10p210 (2022-04-12 revision 67958) [universal.x86_64-darwin23]

Installing Homebrew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
(more…)
26
08
24
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Application folder does not exist when MacOS app is run the first time

Posted by | Mac OS X |

When my QT app starts first time on MacOS, its directory ./Application Support/Sharlines/Lines/ does not exit, but QT creates it when I write to QSettings first time.

To create the local directory I added the following code:

// Local data directory does not exist when the app is run first time on MacOS.
if (fs::create_directories(GetLocalFolder()))
{
    qDebug() << static_cast<QString>(qtil::Format() << "Local folder '" << GetLocalFolder() << "' has been created.");
}
(more…)
04
08
24
 18 Comments

My first attempt to build Yandex Mobile Ads Example for iOS

Posted by | iOS | Tagged |

According to the official repository docs I tried to install CocaPods:

 sudo gem install cocoapods

but got the following error:

ERROR:  Error installing cocoapods:
        The last version of drb (&gt;= 0) to support your Ruby &amp; RubyGems was 2.0.6. Try installing it with `gem install drb -v 2.0.6` and then running the current command again
        drb requires Ruby version &gt;= 2.7.0. The current ruby version is 2.6.10.210.

Installed some dependencies and the installation of CocoaPods succeeded:

sudo gem install drb -v 2.0.6
sudo gem install activesupport -v 6.1.7.8
sudo gem install cocoapods
(more…)
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