Lab 8.1 - Page5-7: docker0 interface has no default IPv4 when running nginx

Hello,
While working on the Lab 8.1 page5-7 (ver. LFS253_09.17.2021), I am facing an issue that the docker0 has no default IPv4 address.
- $ docker container run -d --name web nginx
- 206c7ae0a89a19857881a621b9efbefee144a010b340603cbd083ee16affda0f
- $ ip a
- 4: docker0: <BROADCAST,MULTICAST> mtu 1500 qdisc noqueue state DOWN group default
- link/ether 02:42:7b:65:0c:89 brd ff:ff:ff:ff:ff:ff
However, from the example on the handouts, it has
When Docker daemon starts, it creates adocker0networkbridge on the host system. By default, all thecontainers connect to thedocker0network bridge.
...
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UPgroup defaultlink/ether 02:42:92:80:94:51 brd ff:ff:ff:ff:ff:ffinet 172.17.0.1/16 brd 172.17.255.255 scope global docker0valid_lft forever preferred_lft foreverinet6 fe80::42:92ff:fe80:9451/64 scope linkvalid_lft forever preferred_lft forever
...
It seems not a new issue, and workarounds were tried by following https://github.com/moby/moby/issues/40217. But it does not work.
Would someone provide any advice?
Thanks,
Shiyang
Additional Information:
System: Ubuntu 20.04.3 LTS
Output of docker version
:
- docker version
- Client: Docker Engine - Community
- Version: 20.10.8
- API version: 1.41
- Go version: go1.16.6
- Git commit: 3967b7d
- Built: Fri Jul 30 19:54:27 2021
- OS/Arch: linux/amd64
- Context: default
- Experimental: true
- Server: Docker Engine - Community
- Engine:
- Version: 20.10.8
- API version: 1.41 (minimum version 1.12)
- Go version: go1.16.6
- Git commit: 75249d8
- Built: Fri Jul 30 19:52:33 2021
- OS/Arch: linux/amd64
- Experimental: false
- containerd:
- Version: 1.4.10
- GitCommit: 8848fdb7c4ae3815afcc990a8a99d663dda1b590
- runc:
- Version: 1.0.2
- GitCommit: v1.0.2-0-g52b36a2
- docker-init:
- Version: 0.19.0
- GitCommit: de40ad0
Output of docker info
:
- Client:
- Context: default
- Debug Mode: false
- Plugins:
- app: Docker App (Docker Inc., v0.9.1-beta3)
- buildx: Build with BuildKit (Docker Inc., v0.6.1-docker)
- scan: Docker Scan (Docker Inc., v0.8.0)
- Server:
- Containers: 1
- Running: 1
- Paused: 0
- Stopped: 0
- Images: 18
- Server Version: 20.10.8
- Storage Driver: overlay2
- Backing Filesystem: extfs
- Supports d_type: true
- Native Overlay Diff: true
- userxattr: false
- Logging Driver: json-file
- Cgroup Driver: cgroupfs
- Cgroup Version: 1
- Plugins:
- Volume: local
- Network: bridge host ipvlan macvlan null overlay
- Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
- Swarm: inactive
- Runtimes: runc io.containerd.runc.v2 io.containerd.runtime.v1.linux
- Default Runtime: runc
- Init Binary: docker-init
- containerd version: 8848fdb7c4ae3815afcc990a8a99d663dda1b590
- runc version: v1.0.2-0-g52b36a2
- init version: de40ad0
- Security Options:
- apparmor
- seccomp
- Profile: default
- Kernel Version: 5.11.0-38-generic
- Operating System: Ubuntu 20.04.3 LTS
- OSType: linux
- Architecture: x86_64
- CPUs: 2
- Total Memory: 3.81GiB
- Name: ubuntu
- ID: PZB2:M7VK:IDTT:BADO:K7OO:L6RU:KZZO:3DJ4:5GRC:FXD6:7SRN:J7UX
- Docker Root Dir: /var/lib/docker
- Debug Mode: false
- Registry: https://index.docker.io/v1/
- Labels:
- Experimental: false
- Insecure Registries:
- 127.0.0.0/8
- Live Restore Enabled: false
Best Answer
-
Hi @sli3,
Following the VM provisioning steps with the course recommended hypervisor (VirtualBox) and the recommended bridged network, and then separately with NAT networking as seen in your environment, both lead to successful default docker0 networks creation with default subnets assigned.
I would recommend attempting to create a custom docker bridge network, validating its subnet and attach containers to it.
If the custom bridge creation is not successful, then the VMware Fusion documentation could provide some tips for networking configuration at the hypervisor level that may allow Docker to create its default bridge network on the guest VM.
If all else fails, using a different hypervisor for VM provisioning may help overcome this step and move forward with the lab exercises.
Regards,
-Chris0
Answers
-
Hi @sli3,
Can you share additional details about your system? Is it a native host or a VM? What hypervisor is used, or what cloud infrastructure and what type of cloud instance. VM/Instance size - CPU, MEM, disk. How was docker installed?
Regards,
-Chris0 -
Hi Instructor @chrispokorni,
Thanks for your response. I use MacBook Pro with MacOS 11.6 (20G165). It was created and hosted in a VM (VMware Fusion 12.1) where the Ubuntu was installed from a 64-bit LTS ISO image that downloaded from its official website (https://ubuntu.com/).
The Ubuntu VM is allocated:
- 2 processors
- 4096 MB Memory
- 12 GB disk size
- Network Adapter:
The docker was installed by following the instructions that provided in LFS253.
Thanks,
Shiyang0
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