ansible-role-connectivity-test

Use nc (netcat) to test for network issues to specified IP and port (TCP or UDP).
Dynamically determines source IP to use based on destination IP from available route.

Default uses TCP protocol. You can specify protocol: udp if UDP is needed for test.

Distros tested

• Ubuntu 18.04 / 16.04
• CentOS / RHEL: 7.x, 6.5, 5.9

Dependencies

OS commands:

• nc (netcat) - will be installed if not present
• ip
• awk

Default Settings

• Enable debug

debug_enabled_default: false

• Timeout

connectivity_test_wait_default: 5

• UDP argument to use if 'udp' specified in config

connectivity_test_udp_command: "-u"

• Proxy

proxy_env: []

Example config file (group_vars/xxx/connectivity-test-vars.yml)

TCP protocol used by default (doesn't need to be specified).

---
connectivity_test_destinations:
  - { ip: 192.168.56.10, port: 22 }
  - { ip: 192.168.56.10, port: 5000 }
  - { ip: 127.0.0.1, port: 53, protocol: udp }

Example Playbook connectivity-test.yml

---
- hosts: '{{inventory}}'
  become: yes
  roles:
  - connectivity-test

Usage

ansible-playbook connectivity-test.yml --extra-vars "inventory=all-dev" -i hosts

Skip installing packages (if known already there - speeds up task)

ansible-playbook connectivity-test.yml --extra-vars "inventory=all-dev" -i hosts --skip-tags connectivity_install_pkg

Example output

TASK [setup] *******************************************************************
ok: [centos7]

TASK [connectivity-test : Install dependant packages in RedHat based machines] *
ok: [centos7] => (item=[u'nc'])

TASK [connectivity-test : Get source IP based on destination IP] ***************
ok: [centos7] => (item=source ip: 127.0.0.1, destination ip: 127.0.0.1)
ok: [centos7] => (item=source ip: 127.0.0.1, destination ip: 127.0.0.1)
ok: [centos7] => (item=source ip: 192.168.56.9, destination ip: 192.168.56.10)

TASK [connectivity-test : debug] ***********************************************

TASK [connectivity-test : test network connectivity] ***************************
ok: [centos7] => (item=source ip: 192.168.56.9, destination ip: 192.168.56.10, port: 22, protocol: tcp, time: 2019-07-09 23:02:56.518272, stdout: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8, stderr: Connection to 192.168.56.10 22 port [tcp/ssh] succeeded!

)
ok: [centos7] => (item=source ip: 127.0.0.1, destination ip: 127.0.0.1, port: 53, protocol: udp, time: 2019-07-09 23:03:12.337049, stdout: , stderr: Connection to 127.0.0.1 53 port [udp/domain] succeeded!

)
failed: [centos7] (item=source ip: 192.168.56.9, destination ip: 192.168.56.10, port: 5000, protocol: tcp, time: 2019-07-09 23:03:33.893978, stdout: , stderr: nc: connect to 192.168.56.10 port 5000 (tcp) timed out: Operation now in progress

)

TASK [connectivity-test : debug] ***********************************************

PLAY RECAP *********************************************************************
centos7                    : ok=3    changed=0    unreachable=0    failed=1  

Manual way

dIP="192.168.56.10 192.168.56.13";
dPORT="5000";
sIP=$(/sbin/ip route get "$(echo $dIP|awk -F" " 'NR==1{print $1}')"|awk 'NR==1{print $NF}');
uname -n;
echo "Src IP: $sIP";
for i in $dIP;
do date;
nc -v -w 3 -s "$sIP" "$i" "$dPORT";
echo " ";
done