diff --git a/HowTos/Docker Installation.md b/HowTos/Docker Installation.md
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+## 1. **Docker Installation**
+
+ ```
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+sudo apt update
+
+sudo apt install docker*
+ echo   "or"
+ sudo apt install -y docker-ce
+ 
+sudo systemctl status docker
+sudo usermod -aG docker username     #οπου username το όνομα του χρήστη που θα δουλεύει με docker
+```
+
+**1.1 docker compose**
+
+```
+ sudo curl -L "https://github.com/docker/compose/releases/download/1.24.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
+ sudo chmod +x /usr/local/bin/docker-compose
+ sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
+```
+**1.2 certificate**
+
+```
+$ sudo su
+# touch set-ca.sh
+```
+
+-   **copy-paste lines into set-ca .sh  file**
+    
+
+```
+registry_address=registry.vlabs.uniwa.gr
+registry_port=5043
+mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
+openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
+registry_port=5080
+mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
+openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
+
+registry_address=hub.swarmlab.io
+registry_port=5443
+mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
+openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
+
+registry_port=5480
+mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
+openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
+```
+
+[![asciicast](https://asciinema.org/a/373216.svg)](https://asciinema.org/a/373216)
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