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How do you install Docker on Ubuntu 20.04?

rated 0 times [ 0] [ 0] / answers: 1 / hits: 1921 / 1 Year ago, sat, march 25, 2023, 7:11:06

I spent an entire day attempting to get Docker installed, but I think there's something with my system preventing it from being installed and configured properly. Here's the specifications of Docker I'm trying to install, my Ubuntu system, and what I've tried...

Specs:

Description: Ubuntu 20.04.2 LTS

Codename: Focal

Docker version 20.10.5, build 55c4c88

What I've tried:

I've followed the documentation for installation that Docker provides (https://docs.docker.com/engine/install/ubuntu/). I've tried every method listed and always get to the point where I believe Docker was installed, but it always fails to start. When running journalctl -xe I find that it gets an error "Failed to start Docker Application Container Engine."

When going through the "Install Using Repository" method listed by Docker, when I run sudo apt-get install docker-ce docker-ce-cli containerd.io I receive the output provided below...

Job for docker.service failed because the control process exited with error code.

See "systemctl status docker.service" and "journalctl -xe" for details.

invoke-rc.d: initscript docker, action "start" failed.

● docker.service - Docker Application Container Engine

     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)

     Active: activating (auto-restart) (Result: exit-code) since Sat 2021-04-10 14:04:01 CDT; 6ms ago

TriggeredBy: ● docker.socket

       Docs: https://docs.docker.com

    Process: 30954 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)

   Main PID: 30954 (code=exited, status=1/FAILURE)

dpkg: error processing package docker-ce (--configure):

 installed docker-ce package post-installation script subprocess returned error exit status 1

dpkg: dependency problems prevent configuration of docker-ce-rootless-extras:

 docker-ce-rootless-extras depends on docker-ce; however:

  Package docker-ce is not configured yet.



dpkg: error processing package docker-ce-rootless-extras (--configure):

 dependency problems - leaving unconfigured

No apport report written because the error message indicates its a followup error from a previous failure.

                                                                                                          Errors were encountered while processing:

 docker-ce

 docker-ce-rootless-extras

E: Sub-process /usr/bin/dpkg returned an error code (1)

I've also tried running sudo dockerd and when I run that command I receive this output...

INFO[2021-04-10T14:07:34.379732477-05:00] Starting up                                  

INFO[2021-04-10T14:07:34.380601807-05:00] detected 127.0.0.53 nameserver, assuming systemd-resolved, so using resolv.conf: /run/systemd/resolve/resolv.conf 

INFO[2021-04-10T14:07:34.381241252-05:00] parsed scheme: "unix"                         module=grpc

INFO[2021-04-10T14:07:34.381264907-05:00] scheme "unix" not registered, fallback to default scheme  module=grpc

INFO[2021-04-10T14:07:34.381300038-05:00] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}  module=grpc

INFO[2021-04-10T14:07:34.381314640-05:00] ClientConn switching balancer to "pick_first"  module=grpc

INFO[2021-04-10T14:07:34.382840191-05:00] parsed scheme: "unix"                         module=grpc

INFO[2021-04-10T14:07:34.382879930-05:00] scheme "unix" not registered, fallback to default scheme  module=grpc

INFO[2021-04-10T14:07:34.382919283-05:00] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}  module=grpc

INFO[2021-04-10T14:07:34.382932330-05:00] ClientConn switching balancer to "pick_first"  module=grpc

INFO[2021-04-10T14:07:34.389949119-05:00] [graphdriver] using prior storage driver: overlay2 

WARN[2021-04-10T14:07:34.393356340-05:00] Your kernel does not support CPU realtime scheduler 

WARN[2021-04-10T14:07:34.393368396-05:00] Your kernel does not support cgroup blkio weight 

WARN[2021-04-10T14:07:34.393372980-05:00] Your kernel does not support cgroup blkio weight_device 

INFO[2021-04-10T14:07:34.393489826-05:00] Loading containers: start.                   

WARN[2021-04-10T14:07:34.394967395-05:00] Running modprobe bridge br_netfilter failed with message: modprobe: WARNING: Module br_netfilter not found in directory /lib/modules/5.8.0-48-generic

, error: exit status 1 

WARN[2021-04-10T14:07:34.398454303-05:00] Running iptables --wait -t nat -L -n failed with message: `modprobe: FATAL: Module ip_tables not found in directory /lib/modules/5.8.0-48-generic

iptables v1.8.4 (legacy): can't initialize iptables table `nat': Table does not exist (do you need to insmod?)

Perhaps iptables or your kernel needs to be upgraded.`, error: exit status 3 

INFO[2021-04-10T14:07:34.510702953-05:00] stopping event stream following graceful shutdown  error="<nil>" module=libcontainerd namespace=moby

failed to start daemon: Error initializing network controller: error obtaining controller instance: failed to create NAT chain DOCKER: iptables failed: iptables -t nat -N DOCKER: modprobe: FATAL: Module ip_tables not found in directory /lib/modules/5.8.0-48-generic

iptables v1.8.4 (legacy): can't initialize iptables table `nat': Table does not exist (do you need to insmod?)

Perhaps iptables or your kernel needs to be upgraded.

 (exit status 3)

Apologies on the poor formatting... If anyone has tips that would be greatly appreciated! Let me know if there's some log / code that would be helpful for troubleshooting!