System has not been booted with systemd as init system (PID 1). Can‘t operate.

System has not been booted with systemd as init system (PID 1). Can't operate.

# service --status-all
# 启动守护dockerd
sudo dockerd

failed to start daemon: Error initializing network controller: error obtaining controller instance: unable to add return rule in DOCKER-ISOLATION-STAGE-1 chain:  (iptables failed: iptables --wait -A DOCKER-ISOLATION-STAGE-1 -j RETURN: iptables v1.8.7 (nf_tables):  RULE_APPEND failed (No such file or directory): rule in chain DOCKER-ISOLATION-STAGE-1

sudo update-alternatives --set iptables /usr/sbin/iptables-legacy

sudo sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/g' /etc/sysctl.conf

# 启动Docker
sudo service docker start