Multiple containers getting same IP

[sunilthemaster]

Description
Multiple containers getting same IP

We have an issue in PRODUCTION environment wherein, when we are trying to ping a container from another container, we are getting 2 different container IDs in response. One of the container is alive and other does not even exists.

Even we killed sensu_client container but still it's pinging to that particular container.

Steps to reproduce the issue:
Not sure how we can replicate the issue.

Describe the results you received:

Describe the results you expected:
There should be only 1 IP per container

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker version:

Client:
 Version:       18.03.0-ce
 API version:   1.37
 Go version:    go1.9.4
 Git commit:    0520e24
 Built: Wed Mar 21 23:10:01 2018
 OS/Arch:       linux/amd64
 Experimental:  false
 Orchestrator:  swarm

Server:
 Engine:
  Version:      18.03.0-ce
  API version:  1.37 (minimum version 1.12)
  Go version:   go1.9.4
  Git commit:   0520e24
  Built:        Wed Mar 21 23:08:31 2018
  OS/Arch:      linux/amd64
  Experimental: false

Output of docker info:

Containers: 12
 Running: 4
 Paused: 0
 Stopped: 8
Images: 28
Server Version: 18.03.0-ce
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: false
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: active
 NodeID: wrqykt7b42zbrpo4mqfz2sp54
 Is Manager: true
 ClusterID: 9lh6kgdspjfughhmgvtevp1we
 Managers: 3
 Nodes: 20
 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: 10.100.6.4
 Manager Addresses:
  10.100.6.4:2377
  10.100.6.5:2377
  10.100.6.6:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
 apparmor
 seccomp
  Profile: default
Kernel Version: 4.15.0-1013-azure
Operating System: Ubuntu 16.04.4 LTS
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 6.784GiB
Name: az-prod-mgr-000000
ID: IPZJ:2GQL:OC6Z:UDSS:4OAE:PF46:AAAP:JVYF:4RJG:5JQA:QLWW:XWW2
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

Additional environment details (AWS, VirtualBox, physical, etc.):
It's on Azure Linux VMs

[sunilthemaster]

Any updates? or any comments?

[sunilthemaster]

@thaJeztah : Can you please check.