ssh-keygen -t ed25519 -C "winappdev@gmail.com"
# /home/dmitriano/.ssh/id_rsa_github
# and empty passphrase
nano .ssh/config
Host github.com
HostName github.com
IdentityFile ~/.ssh/id_rsa_github
stat -c %a ~/.ssh/config
chmod 600 ~/.ssh/config
Category Archives: Operating Systems
Configuring the access to GitHub with SSH
“ping: socket: Operation not permitted” error on a clean Ubuntu 24.04 installation
ping did not work on my clean Ubuntu 24.04 installation showing the following error:
ping developernote.com
ping: socktype: SOCK_RAW
ping: socket: Operation not permitted
ping: => missing cap_net_raw+p capability or setuid?
Migrating a WordPress website from PHP 7.4 to PHP 8.3.6
After updated my WordPress to 6.7.1 and added the following to wp-config.php
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
and got the following error message:
Fatal error: Uncaught Error: Call to undefined function wp_kses() in /home/devnote/www/wp-includes/functions.php:6098 Stack trace:
#0 /home/devnote/www/wp-includes/functions.php(5579): wp_trigger_error()
#1 /home/devnote/www/wp-includes/class-wpdb.php(1333): _deprecated_function()
#2 /home/devnote/www/wp-content/sunrise.php(11): wpdb->escape()
#3 /home/devnote/www/wp-includes/ms-settings.php(47): include_once('...')
#4 /home/devnote/www/wp-settings.php(156): require('...')
#5 /home/devnote/www/wp-config.php(107): require_once('...')
#6 /home/devnote/www/wp-load.php(50): require_once('...')
#7 /home/devnote/www/wp-blog-header.php(13): require_once('...')
#8 /home/devnote/www/index.php(17): require('...')
#9 {main} thrown in /home/devnote/www/wp-includes/functions.php on line 6098
Creating Docker network for hosting legacy PHP websites
Running test Docker containers
sudo docker network create --subnet=172.20.0.0/16 legacy_net
sudo docker network ls
NETWORK ID NAME DRIVER SCOPE
61aa4a19ec0c bridge bridge local
7c0ebcfd4e3a dockovpn_default bridge local
79ed9c355254 host host local
99d8bde8e488 legacy_net bridge local
086455f026a8 none null local
Migrating my VPS from Ubuntu 16.04 to Ubuntu 24.04
Migrating the users and groups
Copied my groups from /etc/group:
dmitriano:x:1000:
slogpost:x:1001:www-data,bak
beauty:x:1009:www-data,bak
test1:x:1012:www-data,beauty,dmitriano,devnote,bak
test2:x:1013:www-data,bak
devnote:x:1018:www-data,bak
exchange:x:1025:
git:x:1026:www-data,bak
game:x:1027:www-data,bak
shar:x:1029:www-data,bak
bak:x:1032:
Using tcpdump with OpenVPN
VPN service opens tun0 device in the docker container:
sudo docker exec -it 966f926484bc sh
/opt/Dockovpn # ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:AC:11:00:03
inet addr:172.17.0.3 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20553 errors:0 dropped:0 overruns:0 frame:0
TX packets:20539 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:14609434 (13.9 MiB) TX bytes:14757264 (14.0 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:7825 errors:0 dropped:0 overruns:0 frame:0
TX packets:12572 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:1673378 (1.5 MiB) TX bytes:12115333 (11.5 MiB)
Connecting to OpenVPN from an Android device
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
Installing Windows Sandbox
In addition to enabling Sandbox (a special purpose limited container) you also need to enable Windows Hypervisor Platform and also Virtual Machine platform:
My Android Phone requires release apps to be signed
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]
Viewing image metadata on Ubuntu 22.04
sudo apt install imagemagick
identify -verbose my-image.jpg
