LXD: Create container with HTTP(s) proxy

CONTAINER=haproxy
 
# Create container
lxc launch ubuntu:18.04 ${CONTAINER}
sleep 10
 
# Deploy SSH key
lxc file push --uid 0 --gid 0 --mode 600 ~/.ssh/id_rsa.pub ${CONTAINER}/root/.ssh/authorized_keys
 
# Configure http(s) proxy inside of container (if set on host)
[ -z ${http_proxy} ] || echo "export http_proxy=$http_proxy" | lxc shell ${CONTAINER} -- tee -a /etc/environment
[ -z ${https_proxy} ] || echo "export https_proxy=$https_proxy" | lxc shell ${CONTAINER} -- tee -a /etc/environment
 
# Update APT repository
lxc exec ${CONTAINER} -- bash -c ". /etc/environment && apt update"
 
# Optional: install applications
lxc exec ${CONTAINER} -- bash -c ". /etc/environment && apt install -y haproxy"