Add Proxmox/docker_in_lxc.md

Proxmox/docker_in_lxc.md

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+# Install Fuse on Proxmox Host
+
+```bash
+apt clean && apt update
+apt install -y fuse-overlayfs
+```
+
+# Options for LXC
+Enable 'keyctl', 'Nesting', and 'FUSE'
+
+
+# Install Fuse in the LXC
+
+```bash
+apt clean && apt update
+apt install -y fuse-overlayfs
+ln -s /usr/bin/fuse-overlayfs /usr/local/bin/fuse-overlayfs
+```
+
+# Install docker from official documentation
+
+```bash
+# Ensure pre-requisites are installed
+apt install -y ca-certificates curl gnupg lsb-release
+
+# Add Docker GPG key
+mkdir -p /etc/apt/keyrings
+curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+
+# Add Docker apt repository
+echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
+
+# Update sources and install Docker Engine
+apt update
+apt install -y docker-ce docker-ce-cli containerd.io docker-compose docker-compose-plugin
+
+# Test for successful installation
+docker run hello-world
+
+# Enable the Docker engine to start at boot
+systemctl enable docker
+```