Task failed: Failed to connect to the host via ssh - When using Netbird hosts with Oracle VPSes #4138

masterwishx · 2026-08-12T08:57:28Z

masterwishx
Aug 12, 2026

Using netbird for update packages in oracle vpses. Some time it working fine and some time got errors when updating packages:

.... [ERROR]: Task failed: Failed to connect to the host via ssh: Shared connection to 100.84.0.16 closed.
12:21:01 AM
Origin: /tmp/semaphore/project_2/repository_3_template_8/Playbooks/My-Examples/update.yml:95:7
12:21:01 AM
12:21:01 AM
93     ###########################################################################
12:21:01 AM
94
12:21:01 AM
95     - name: Update Ubuntu packages (with retries)
12:21:01 AM
         ^ column 7
12:21:01 AM
12:21:01 AM
fatal: [instance-mysite-cloud2]: UNREACHABLE! => 
12:21:01 AM
    changed: false
12:21:01 AM
    msg: 'Task failed: Failed to connect to the host via ssh: Shared connection to 100.84.0.16
12:21:01 AM
        closed.'
12:21:01 AM
    unreachable: true
12:21:02 AM
[ERROR]: Task failed: Failed to connect to the host via ssh: Shared connection to 100.84.0.17 closed.
12:21:02 AM
Origin: /tmp/semaphore/project_2/repository_3_template_8/Playbooks/My-Examples/update.yml:95:7

Tryed to add:

[all:vars]
ansible_ssh_common_args='-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'

After tryed this but still :

[all:vars]
ansible_ssh_common_args='
  -o ControlMaster=no
  -o ControlPersist=no
  -o StrictHostKeyChecking=no
  -o UserKnownHostsFile=/dev/null
'

not helped Becouse seems still use semaphore config...

<100.84.0.15> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o StrictHostKeyChecking=no -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlMaster=no -o ControlPersist=no -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o 'ControlPath="/home/semaphore/.ansible/cp/b47c7b2f8e"' -o NumberOfPasswordPrompts=1 100.84.0.15 '/bin/sh -c '"'"'echo ~root && sleep 0'"'"''

Lujain-ALghamdi · 2026-09-08T20:11:11Z

Lujain-ALghamdi
Sep 8, 2026

I think the confusing part here is ansible_ssh_common_args.

Those options are added to Ansible's existing SSH arguments, they don't replace them. Ansible uses these by default:

-C -o ControlMaster=auto -o ControlPersist=60s

So even if you add:

ansible_ssh_common_args='-o ControlMaster=no -o ControlPersist=no'

you can still see both sets of options in the -vvv output.

I'd try overriding ansible_ssh_args instead:

[all:vars]
ansible_ssh_args='-C -o ControlMaster=no -o ControlPersist=no -o ServerAliveInterval=30 -o ServerAliveCountMax=3'
ansible_ssh_common_args='-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'

Then run the playbook again with -vvv and check whether ControlMaster=auto and ControlPersist=60s are gone.

Since the connection is going through NetBird (100.84.x.x), I'd also test SSH directly from the same machine/container where Semaphore is running:

ssh -vvv root@100.84.0.16

If the direct SSH connection also drops, then I'd look at NetBird or the remote VM/network rather than Semaphore.

So I'd first make sure multiplexing is actually disabled using ansible_ssh_args, then test the same connection outside Ansible. That should help narrow down where the disconnect is happening

1 reply

masterwishx Sep 9, 2026
Author

If the direct SSH connection also drops, then I'd look at NetBird or the remote VM/network rather than Semaphore.

So I'd first make sure multiplexing is actually disabled using ansible_ssh_args, then test the same connection outside Ansible. That should help narrow down where the disconnect is happening

Thanks, will try to check it.
For now I disabled gathering facts in job, this couse for make much less errors

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Lujain-ALghamdi Sep 8, 2026

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masterwishx
Aug 12, 2026

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masterwishx Sep 9, 2026
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