Install: [Errno 16] Device or resource busy

Docker Version: 17.09 CentOS 7 (1708) base Existing docker native swarm Remote API TLS secured on 2376 Firewalld disabled (all ports open)

Apologies if I should be posting this in the ansible project, the repo layout is a bit confusing. I assume (hope) the same folks are working on both projects.

I am performing the install steps on the one manager node in a four node docker swarm. Swarm is fully functional and tested.

Following the minimal, if not ambiguous, installation documentation, the installation fails in https://github.com/contiv/ansible/blob/master/roles/contiv_network/tasks/main.yml

at the step:

- name: setup netmaster host alias
  lineinfile:
    dest: /etc/hosts
    line: "127.0.0.1 netmaster"
    regexp: " netmaster$"
    state: present
  when: (run_as == "master")

With the error:

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: OSError: [Errno 16] Device or resource busy", "fatal: [node1]: FAILED! => {\"changed\": false, \"failed\": true, \"msg\": \"Unable to rename file: /tmp/tmpsgmY9l to /etc/hosts: [Errno 16] Device or resource busy\"}"

This appears to be a known issue, updating /etc/hosts within a docker container causes this error. https://github.com/moby/moby/issues/22281

As per the cpuguy83, editing /etc/hosts is not even supported (though there is a workaround Contiv does not employ). Bizarre.

So I am confused. Why would something not supported be attempted as part of the Contiv install? Why would an error so basic come up and yet be unreported?

I must be doing something wrong, yet it doesn't seem relevant to any particular configuration item.

Help?

PS.

Containers: 2
 Running: 2
 Paused: 0
 Stopped: 0
Images: 3
Server Version: 17.09.0-ce
Storage Driver: devicemapper
 Pool Name: docker-thinpool
 Pool Blocksize: 524.3kB
 Base Device Size: 10.74GB
 Backing Filesystem: xfs
 Data file: 
 Metadata file: 
 Data Space Used: 536.9MB
 Data Space Total: 255GB
 Data Space Available: 254.5GB
 Metadata Space Used: 413.7kB
 Metadata Space Total: 2.68GB
 Metadata Space Available: 2.68GB
 Thin Pool Minimum Free Space: 25.5GB
 Udev Sync Supported: true
 Deferred Removal Enabled: true
 Deferred Deletion Enabled: true
 Deferred Deleted Device Count: 0
 Library Version: 1.02.140-RHEL7 (2017-05-03)
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host ipvlan macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: active
 NodeID: izeofieioqnz2lttf6xuvhwxu
 Is Manager: true
 ClusterID: z66z0ewyu2qchjmtfqbhxdu33
 Managers: 1
 Nodes: 4
 Orchestration:
  Task History Retention Limit: 5
 Raft:
  Snapshot Interval: 10000
  Number of Old Snapshots to Retain: 0
  Heartbeat Tick: 1
  Election Tick: 3
 Dispatcher:
  Heartbeat Period: 5 seconds
 CA Configuration:
  Expiry Duration: 3 months
  Force Rotate: 0
 Autolock Managers: false
 Root Rotation In Progress: false
 Node Address: 192.168.100.90
 Manager Addresses:
  192.168.100.90:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 06b9cb35161009dcb7123345749fef02f7cea8e0
runc version: 3f2f8b84a77f73d38244dd690525642a72156c64
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 3.10.0-693.5.2.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 2.781GiB
Name: demo-swarm-m1
ID: F7YZ:LXDS:ZWF2:HZVW:7SGN:XJBB:MSWM:K3MT:UMGM:4XUK:Z2N5:FDB4
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: true
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

contiv / install

Install: [Errno 16] Device or resource busy #313