diff --git a/install.sh b/install.sh
index b327538..ecadb9e 100644
--- a/install.sh
+++ b/install.sh
@@ -4,6 +4,27 @@ print_ylw(){
   echo -e "\033[33m$1\033[0m"
 }
 
+function is_x64 {
+  print_ylw "[ determine architecture ]"
+  arch=$(lscpu | grep -i architecture | cut -d ":" -f2)
+  if [ $arch != "x86_64" ]; then
+    false
+  else
+    true
+  fi
+}
+
+function choose_packages {
+  if is_x64 ; then
+    print_ylw "[ with docker ]"
+    packages="curl git nmap tcpdump net-tools wireguard tmux mc docker docker-compose"
+  else
+    print "[ without docker ]"
+    packages="curl git nmap tcpdump net-tools wireguard tmux"
+  fi
+}
+
+function disable_ipv6 {
 print_ylw "[ ipv6 turn off ]"
 cat << EOF >> /etc/sysctl.conf
 net.ipv6.conf.all.disable_ipv6=1
@@ -11,10 +32,14 @@ net.ipv6.conf.default.disable_ipv6=1
 net.ipv4.ip_forward=1
 EOF
 sysctl -p
+}
 
+function sshd_cfg_bup {
 print_ylw "[ sshd_config backup ]"
 cat /etc/ssh/sshd_config > /etc/ssh/sshd_config_BUP &&
+}
 
+function sshd_config {
 print_ylw "[ configuring sshd ]"
 
 cat << EOF > /etc/ssh/sshd_config
@@ -32,16 +57,31 @@ PrintMotd no
 AcceptEnv LANG LC_*
 Subsystem	sftp	/usr/lib/openssh/sftp-server
 EOF
+}
 
-print_ylw "[ appending ssh-keys ]"
-echo "ssh-rsa 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" >> ~/.ssh/authorized_keys
-echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAEAQDMT0hLA/p00VWu98mPQg0aSe/9FbP/wCyg2YGGHEffFPs8zmfJAa6xIAFM3mIc2FhcNPOrAdbA/YpqxrA/3kf7G2JmaDSlRxlUeWXHvXkEVFvfEV2ItKp3sK4pj1kfw2b8K1Ymz5Q25ko51Z9crfBy5Y8Vsz9mjVjzh8t+gfhDevzz6rUiOOzViQIclrbqSHMBWkL2WRTOL8nw5CGz0JgYgdrgX1rLEMYMr6WGV+qRxiIgLc3U6odnJ/m3szU7KNL9+rkreJvcukLIJtRunJAdIc+ann4gJFXDgjr/s0+wh3xL3HQAhOJflgw7FOTSh3MEerMC72d6DS01wJc6QY291cTPCqHBFrtAFBcupoHQCLgcTmYVB3BKjGnKHCXtOQRjYvS5Oe+bQQccv3csxIn2xlz0yVBwC+10fzjDixiRwJyQ75hcz9KEyur52Dc9hIC6tJ9CSFN9IMDoFXBeav41S2gGyjMxtuxxcbY5YlsGT+XeTpArue+MPyovyng+XXO8GSCyOxymHXivqCqx1mHOiL976gMZ/m09FoEWyd8cLLn56HcQlURs04htn9ghYKGZOjBnoyCfY5CRLFE/O+Nmbl37roRKZvqNJjx2+FTbHZ8qos+JEZBW+nEg4gp85LnygSdFyNPfkVPVccI4HLwdm1FVR+O8kN5Q7zrOllOPoj1rsPnavjtCd6UXOG5wlLsliHDHPmJwkEvBaxcEh3N6l4cZeD7teMlfE4XDxKTRXRZd7IVHGrGIP+dqd+RKVezObz8IqBTCoDwBkXqZudLdlXULRsaEuYo+HaGjBug0dQRYbFTllj52ypnjfeiWRP6yvvlcLHT3GpDbbW8kzMXlwYmlyQQbgQf/Z4cU10PHqJbGOlQlEgN7gUsAI+Isl9UaEx5haDnXapbM4PFxGzhtjZ+YuIMYC8b19oXjKm0oLZhwN3S/vB54pPnmb3OQH+vc6pMZPeHX6G3sH9vwVe1qYlBspV5ICVrpV27j4f7cnCH7MJpcanw3VHqcSn0gC30EQBbi+iCOyMJZy2x0P2FZ8W5dvIarewoUu/dTkQ+hGea5Cs4wSW53YhEK0rEKr8HYRXhmrEtnf4B8MhJ5DGBzHueKOYAM5BdwXp7GU4xPGWq5g0kTCSqGOQJWVDOdYyqsdhNned2rg+HybVDyb+XaF8j3aa48qN02I2bhbOr0iJEfBJzjVPcsB61M/VQ3xbt6+AET5wqAbZu1pVH+Dion4YyYjWy1DX802h2WNDvOzRwC82qeOUbZf3CTolBeKucdnLx5o8w9wsjxK80ArxRFx472Q45QkE61NLgcSfBHy+JywOxdP/fc0bwI/sFtAqEX5LCEkgqtB8r1w9bzCeeH u0_a294@poco"
+function add_authorized_keys {
+  print_ylw "[ appending ssh-keys ]"
+  echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQDAPCabE6gKZkksoYdCCclvqBwPLMHM7Wasi3OtzgYmfyJzCPy2twMBZ35HbmuXd0oUE6IBScosGwgs3+5EQ/21b5BUosdZy82DDGG8vXwY2oxqd0U3GzebLmks8TRvdnZ2KXyMlbM9tB5lxrT8kaCdNWtj3Zbipjj2U6LDfvl9J5qojW4F7sNuh3qQ5T7FJA0R/X3F2K3VVk+ZD0PXy1pIauXck3K7iHtTjjHmBw73Ym0d+cg8MEOY7Y+tU4s8f2dOHN9VOSFONoYw0tOxUzZwYGNplEj3xDFUTsbm5wpWd6rGF9ilAqAnwB5Uwbq39ThikKi72PwIFr1e4QIf1AIOdci+yfrezZ/CwHw3AgaCY1PMbX50EZfa3Y9YhZH4bT7mVMCOVkOtIURiHEdcGeqjCe73eizTvDPE+0/xLPqIkJLI9Q4EeJESzRDNUkGiL6/L7Yi38pY+TqRz2dpyvuN9CHAmNPc9kmU9sdOOfAvSv7wGzTG3zB5NCU7UlWW3wPRYLTvYbRXHDROF8OlFjhLYGG6AYdJbNXTfQFHymKOJRjWiVaeBKMlAmhosdlEyRN1zYBb0bHdptEWpsqjv6mPQ3W20pS1h4zRT2P71TsA7UPlHTAeLgUuv9NW49VpdoKBId8cfJOmLesft1bGHfjgg8UNTbCpnOi0lRjoT4vxBPQ==" >> ~/.ssh/authorized_keys
+  echo "ssh-rsa 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 u0_a294@poco"
+}
 
-print_ylw "[ restart sshd ]"
-systemctl restart sshd
+function restart_sshd {
+  print_ylw "[ restart sshd ]"
+  systemctl restart sshd
+}
 
-packages="curl git nmap tcpdump net-tools wireguard tmux mc docker docker-compose"
-print_ylw "[ packages installation: $packages ]"
-apt install $packages
+function install_packages {
+  print_ylw "[ packages installation: $packages ]"
+  apt install $packages
+}
+
+
+disable_ipv6
+sshd_cfg_bup
+sshd_config
+add_authorized_keys
+restart_sshd
+choose_packages
+install_packages
 
 print_ylw "[ DONE ]"